Full text from the House of Lords debate ref the protection of chalk streams and the Bishop of Norwich’s amendment to the Planning and Infrastructure Bill.

Extracted from Hansard Report – Planning and Infrastructure Bill – Hansard – UK Parliament

Amendment 93

Moved by

Baroness Grender 

93: Clause 52, page 73, line 22, at end insert—

“(6A) Where a strategy area includes a chalk stream, the spatial development strategy must include policies on permissible activities within the area of the stream for the purposes of preventing harm or damage to the stream or its surrounding area.”Member’s explanatory statement

This amendment would ensure spatial development strategies include policies to protect chalk streams.

Baroness Grender 

My Lords, Amendment 93, in my name and that of the noble Baroness, Lady Jones of Moulsecoomb, aims to secure the future of England’s chalk streams by enshrining specific protections and standards into our planning regime. As we made clear in Committee, these globally rare ecosystems—there are only 200 in the world—are often referred to as our country’s rainforests in terms of biodiversity and they face genuine risk from piecemeal development and inadequate water management. These are risks that will only intensify without a robust and specific legislative lever.

Relatively recently, I went for a customary walk in a beautiful green space in south-west London, only to discover that the beautiful River Wandle, home to brown trout and kingfishers, had been destroyed by a devastating diesel leak. The Government intend to streamline housebuilding and environmental measures in tandem, but the practical reality is stark.

Chalk streams are uniquely vulnerable. Abstraction of water, chronic pollution and unchecked development have led to tangible declines in many local areas. In 2023, the Liberal Democrats collected data through freedom of information requests, which revealed that one in 10 chalk stream sewage monitors were faulty, with some water companies having much higher rates of broken or uninstalled equipment.

Amendment 93 delivers a targeted solution: a statutory driver for sustainable drainage standards before any development interfaces with public sewers, closing a loophole that currently exists and has allowed cumulative harm to chalk streams. This amendment would ensure that developers are compelled to apply national standards for drainage and water treatment ahead of any permissions, rather than leaving mitigation as an afterthought.

Amendment 94 in the name of the right reverend Prelate the Bishop of Norwich complements this approach, and I thank him for the work he has done on this issue and his environmental expertise, which he has brought to this debate. Amendment 94 tightens oversight and demands full transparency in environmental impact reviews on watercourses at risk, an essential safeguard for communities whose local rivers are too often treated as collateral damage by the planning system’s inertia.

None of us should accept that cleaner, safer waterways are an optional extra and a nice to have. By adopting an amendment on chalk streams and supporting, out of these two amendments, Amendment 94, this House will signal that nature restoration, water quality and sustainable infrastructure are not in competition but can be advanced through co-ordinated and legally binding steps. I urge noble Lords to support these amendments for the sake of our streams and the communities they sustain.

If the right reverend Prelate the Bishop of Norwich moves to a vote, these Benches will support him. It is right that, with something as crucial as our unique chalk streams, we ask our colleagues in the House of Commons to think again and strengthen and protect in law this ecosystem that is almost unique to England. I hope that this House will unite in voting for Amendment 94 and protecting this rare heritage for future generations.

Amendment 94

The Lord Bishop of Norwich 

My Lords, I shall speak to Amendment 94, and I thank the noble Earl, Lord Caithness, the noble Viscount, Lord Trenchard, and the noble Baroness, Lady Willis of Summertown, for their support. I am most grateful to follow the noble Baroness, Lady Grender, who has just spoken so powerfully about her amendment, as well as offering her support for this amendment. Amendment 94 would require a spatial development strategy to list chalk streams in the strategy area, outline measures to protect them from environmental harm and impose responsibility on strategic planning authorities to protect and enhance chalk stream environments.

Chalk streams, as we have heard, are a very special type of river. Some 85% of the world’s chalk streams are in England. They are fed primarily by spring water from the chalk aquifer, not rain, which means that they have clear, cold water and very stable flows. These globally rare habitats are found in a broad sweep from Yorkshire and the Lincolnshire Wolds through Norfolk, the Chilterns, Hampshire and Dorset. The Bure, Glaven, Wensum, Test, Itchen and Meon are river names that come to mind flowing, as they do, through the tapestry of English history and in our literature, such as the River Pang-based Wind in the Willows. They are rich in minerals, especially calcium, and this “base rich” environment supports a distinctive and rich ecology.

It is no wonder that this amendment and a similar one in the other place have received such positive support, including in your Lordships’ Committee. What it seeks to do is such an obvious thing, for what we love, we should desire to protect; what we value, we should safeguard; what is of global significance, we should be deeply proud of.

I am grateful that the Minister responded to my letter to her about my amendment. However, her response was far from reassuring in two ways. First, the Government have pointed to local nature recovery strategies as a way of protecting chalk streams. These could, of course, in future be capable of considering, avoiding and otherwise mitigating for direct damage to these habitats, such as occurs from the footprint of a development near a chalk stream. However, to do so, LNRSs will need more bite in the planning system than they currently have. We are still waiting for the regulations designed to do precisely that, placing a duty on local planning authorities to take account of the nature strategy when making planning decisions. 

We are still waiting for that to be commenced, and it is now a full two years after these regulations were promised in the Levelling-up and Regeneration Act 2023.

Even once the regulations are passed, LNRSs will not be well placed to map, quantify and avoid or mitigate for the offsite impacts of development such as downstream pollution or the additional water that will be abstracted from chalk streams or their aquifers to serve new homes. These very real threats to our chalk streams, over areas much larger than are covered by strategies, cannot be addressed by LNRSs.

Secondly, the Government have pointed to their plans to limit overabstraction by water companies through amending licences, but their target achievement date is 2030. This could take far, far too long and be far, far too late for many threatened chalk streams. The current abstraction situation is grave. Water companies are not sourcing their water from chalk streams within sustainable limits. The Catchment Based Approach’s chalk streams annual review 2024-2—a mouthful of a title—published last week, reports that a third of chalk streams do not have healthy flow regimes. This CaBA report also highlights additional water bodies where, despite flows being classed as compliant overall, abstraction can cause significant local impacts in parts of the watercourse. For example, in the River Loddon, upstream areas are impacted by abstraction but, because of wastewater discharge downstream of them, flows at the assessment point are classed as compliant. If overabstraction occurs for a sustained period upstream, the whole chalk stream could well dry out.

In light of the growing and urgent challenges facing our chalk streams, we cannot afford to wait for LNRSs to have more planning bite, or for 2030, when the abstraction licence amendments come into effect. We need Amendment 94 so that spatial development strategies are equipped to enable planning authorities to direct development away from areas where development footprints, pollution and overabstraction could sound the death knell for declining chalk streams. I will certainly listen to the Minister’s response with care. However, if this amendment continues to secure wide support, I will look to test the opinion of the House.

Baroness Willis of Summertown 

I am pleased to add my name to the important amendment tabled by the right reverend Prelate the Bishop of Norwich, and to Amendment 92 in this group, because, let us be honest, we are not starting from a good place with chalk streams. As mentioned by my noble friend, the current status of these unique and extremely rare habitats in the UK is poor, with more than three-quarters failing to meet good ecological health standards. This is precisely why the chalk streams became such an important issue for debate in the Levelling-up and Regeneration Bill. I remember only too well the same Front Bench colleagues debating long and hard for their protection.

The chalk stream recovery plan, announced by the previous Government, was seen by many, including me, as a good step in the right direction. But here we are again, with chalk streams back in the firing line and, despite the reassurance from the Minister on Report that local nature recovery strategies could propose priorities for their protection, the problem with our planning system is that it requires local authorities only to have regard to our LNRSs, which is not strong enough to protect these vulnerable habitats. We came across this a number of times in the Levelling-up and Regeneration Bill. Those words are etched in my memory.

Also, although the NPPF recognises the importance of irreplaceable habitats, chalk streams, much to my alarm—and, I am sure, to that of many in this House—are not specifically listed as protected habitats. Therefore, they do not have the overarching level of protection in the Bill, through the spatial development strategies, in the same way other protected habitats do. The only hope left, therefore, is the chalk stream nature recovery plan, launched by the previous Government. However, in reply to the question on this asked in Committee by the noble Viscount, Lord Trenchard, who sadly cannot be here today, the Minister stated that even this is now on hold because it is out of step with the ambitious programme of water reforms proposed by the Government. Perhaps the Minister can say for how long it will be on hold, as a result permitting further damage to occur in these unique freshwater habitats.

I say this because time is of the essence here. As an ecologist, I went back to look at the literature. Research on chalk streams has demonstrated that while removing pollution can result in the improvement of water quality within a month to a few years, ecological recovery can take between 10 and 20 years. The more damage we do, the longer it will take for them to recover.

Lastly, surely there must be some no-go habitats in some of our river catchments, and these chalk streams should be one of them. I therefore urge the Minister to agree to this amendment, within which the spatial development strategy would mandate the sort of responsibilities that lead to the protection and enhancement of these unique and rare chalk stream habitats.

Lord Bellingham 

My Lords, I support both amendments. I made a speech in Committee in which I laid out very similar arguments to those put by the right reverend Prelate and the noble Baroness, Lady Willis. I will not repeat them now, except to say that the right reverend Prelate referred to a number of chalk streams in my old constituency of North West Norfolk. These incredible assets—these unique and precious assets—are at risk as we speak. I say to the Minister that neither amendment is particularly demanding. They are quite modest in their overall fabric and intent. If the Government are serious about their environmental credentials, and about trying to do something for the countryside, I urge them, please, to accept these amendments.

The Earl of Caithness 

My Lords, I have put my name to the right reverend Prelate’s amendment. I am delighted to see him back in the Chamber; we missed him in Committee.

My noble friend Lord Roborough was absolutely right when he said in Committee that all rivers are important. Yes, that is true, but chalk streams are that bit more important. The reason for that is that we have 85% of the world’s chalk streams. We are custodians for that majority, but 83% of those chalk streams do not meet good ecological standards. We have handled the whole situation very badly. I think we have taken a retrograde step with this Government, who have dispensed with the chalk stream recovery pack, which the noble Baroness just referred to.

I have written to the Minister and told her that I will ask her a number of questions. I have given her forewarning, so I expect replies. In what respect did that chalk stream recovery pack fall short? It was nearly ready to go when the Labour Government took over after winning the election. They could have pressed the button; that chalk stream pack focused on some difficult questions that nobody had fully addressed before, so why have they torpedoed it? What do they propose to do that will be better than that pack had proposed?

Let us go down to some specifics of the pack. It had time-bound commitments to reduce groundwater abstraction on numerous chalk streams which, according to the Environment Agency’s own data, are unsustainably extracted: for example, the Darent in Kent, where over half the rainfall that feeds the river is taken away for public water supply. There was a timescale for getting that right. Will the Government stick with that timescale or will there be something longer? Do the Government have plans to move water abstraction further downstream, rather than at the headwaters of these rivers?

The chalk stream pack also had a timebound commitment to address the hundreds of small sewage works in chalk streams that do not remove phosphorus in the treatment process and where there is currently no policy or incentive to drive investment. What are the Government going to do better to give a good timescale to get all those water treatment plants in good order? The pack also addressed run-off from highways and local roads, which I have spoken about before in your Lordships’ House, and how damaging it can be to chalk streams in particular because of the added silt. The CaBA chalk stream strategy recommends revised best practice guidelines for local councils that give more protection to chalk streams. Do the Government have better plans than that? The pack also put forward solutions to reform the farming rules for water, which are currently ineffective. What are the Government going to do to replace that recommendation?

I did not mention this question when I wrote to the Minister, but I will add it now: how do the Government intend to address the physical dysfunctionality of many chalk streams moved, straightened, dredged or dammed over the centuries and put them back to their natural state? In destroying the hard work of some very good, able and committed people who produced the chalk stream pack, the Government have alienated some potential friends in their effort to improve the environment. How are they going to get friends back onside when, after all that work, they have just dismissed it as though it did not matter? What plans do they have to include such people in the future to try to improve the whole river system for chalk streams? It is no good taking just one little area in one district or county council, because chalk streams do not understand those borders; they flow through lot of different councils. The whole thing has to be tackled on a holistic basis, and the only way to do that is by supporting the right reverend Prelate’s amendment.

Lord Roborough 

My Lords, I shall speak to the amendments in the names of the noble Baroness, Lady Grender, and the right reverend Prelate the Bishop of Norwich. I am grateful for their excellent, informative introductions. We on these Benches tabled similar amendments in Committee. The amendments share a vital purpose: to ensure that our planning system gives proper recognition and protection to chalk streams, one of our most distinct and rarest natural habitats. These streams help define our landscapes, support unique biodiversity and supply water to many communities. The amendments would require spatial development strategies to identify and protect chalk streams, setting out the responsibilities for planning authorities in their stewardship.

These are sensible, constructive proposals and I am grateful to those who have tabled and supported them. We will support the right reverend Prelate the Bishop of Norwich if he divides on his amendment this evening. Will the Minister say whether she considers chalk streams to be irreplaceable habitats, like ancient woodlands, and therefore deserving of similar policy protection? The case for stronger recognition of chalk streams within our planning system is compelling. They are an irreplaceable part of our natural heritage and a globally important asset, and the way we plan for growth must reflect that.

I hope the Minister has heard the House and will be able to accept these amendments, and explain, as the noble Baroness, Lady Willis, and my noble friend Lord Caithness have asked, why our chalk stream restoration strategy is on hold.

Baroness Taylor of Stevenage 

My Lords, I thank the noble Baroness, Lady Grender, and the right reverend Prelate the Bishop of Norwich for Amendments 93 and 94, which propose additional statutory obligations for strategic planning authorities in relation to the identification and safeguarding of chalk streams. With 85% of the world’s chalk streams found in England, these unique water bodies are not just vital ecosystems but are indeed a symbol of our national heritage. The Government are committed to restoring them, which is why we are taking a strategic approach to restoring chalk streams. Working in partnership with water companies, investors and communities, the Government will introduce a new water reform Bill to modernise the entire system so that it is fit for purpose for decades to come. This is essential to restoring chalk streams to better ecological health and addressing the multiple pressures facing these habitats.

Alongside the programme of ambitious reforms, the Government are continuing to deliver vital improvements and investment for chalk streams, including £1.8 million through the water restoration fund and water environment improvement fund for locally led 

chalk stream projects. Over the next five years, water companies will spend over £2 billion on chalk stream restoration.

The Government remain firmly committed to the restoration and protection of chalk streams. Plan-makers and decision-makers should recognise these habitats as valued landscapes and areas of high biodiversity. They deliver essential ecosystem services, contribute significantly to natural capital, and should be identified and protected through local plans.

As I emphasised in Committee, local nature recovery strategies provide a tool for identifying and enhancing chalk stream habitats. These strategies map priority areas for nature and are informed by key environmental data, such as the assessments carried out under river basin management plans. Under Section 12D(11) of the Planning and Compulsory Purchase Act 2004, spatial development strategies must already take account of relevant local nature recovery strategies.

In answer to the points made by the right reverend Prelate, local nature recovery strategies are a legal requirement and are prepared by responsible authorities, typically county or combined authorities appointed by the Defra Secretary of State. There are 48 LNRS areas and lead authorities covering the whole of England; there are no gaps, and no overlaps. LNRS responsible authorities work closely with local partnerships, involving all local planning authorities, to identify and map proposed areas for habitat management, enhancement, restoration and creation for biodiversity and the wider natural environment. The West of England Combined Authority published the first LNRS in November 2024. Five more have since followed: North Northamptonshire Council, Cornwall, Isle of Wight, Essex and Leicestershire. The remaining 42 are expected to be published by the end of 2025, or shortly thereafter.

I will also address the right reverend Prelate’s point about the provisions in the LURA. The Act created a duty requiring plan-makers to take account of LNRS. This builds on the existing requirement on all public authorities to have regard to LNRS in complying with their duty to conserve and enhance biodiversity. This duty will be commenced as part of wider planning reforms later this year.

Where a strategic authority considers chalk stream protection to be of strategic importance, Section 12D(1) requires that spatial development strategies include policies on land use and development that address such strategic priorities. Authorities will therefore be able to include such policies where appropriate.

Furthermore, planning policy is clear that decisions should prevent new and existing development contributing to unacceptable levels of water pollution. Where water quality has the potential to be a significant planning concern, an applicant should explain how the proposed development would affect a relevant water body in a river basin management plan and how they propose to mitigate the impacts.

Fixing systemic issues is essential to addressing the multiple pressures facing these habitats, and restoring our chalk streams to better ecological health is part of our overall programme of ambitious reforms for the water sector.

I will respond to the points made by the noble Earl, Lord Caithness. I am more than willing to answer all his points—I will try to do so briefly. It might have been more helpful to have them in writing before today, but I will cover the points he has raised. First, on the time-bound commitments to reduce ground water abstraction, we are tackling one of the biggest threats to chalk streams by reducing harmful abstractions by an estimated 126 million litres daily by 2030, protecting vital water flows to these fragile ecosystems.

Companies covering chalk stream areas, such as Affinity Water and South Staffs Water, have made specific commitments to reduce abstraction from chalk streams. Affinity Water has committed to reducing abstraction by 34% by 2050. Portsmouth Water is building a new reservoir in Hampshire to protect the River Test and the River Itchen—this is the first new reservoir to be built since the 1970s. In June 2025, the Environment Agency updated its national framework for water resources, which set out the importance of chalk streams and how we will include their needs in water resources planning and decision-making.

On time-bound commitments to address hundreds of small sewage works in chalk streams that do not remove phosphorus, under the Environment Act, to achieve the 80% reduction in phosphorus load discharge, the phosphorus improvement driver prioritises action for catchments that meet one or more of the following criteria: catchments with water framework directive regulations—phosphorus standard failures; catchments with identified nutrification issues under the Urban Waste Water Treatment Regulations; and catchments where phosphorus targets set by conservation policy advisers are exceeded. That prioritisation ensures targeting to achieve the best environmental outcomes.

In addressing run-off from highways and local roads, the Defra Secretary of State has committed to including a regional element in the new water regulator. We are considering how road or highway run-off and urban diffuse pollution can be managed at a regional or local level as part of moving to a catchment-based approach.

Lastly, on the reform of farming rules for water—which the noble Lord said in his letter are currently ineffective—the levels of water pollution from agriculture are unacceptable. We are looking at reforming the regulations, including the farming rules for water, as a priority within a suite of broader interventions. We are also working with farmers, environmental groups and other parties to improve the farm pollution regulations to make sure that they are simple and effective. This will allow us to deliver pollution reductions and clean up our waters while supporting farm businesses to grow. I hope that is helpful to the noble Lord.

We need to continue to tackle the biggest impacts on chalk streams, including reducing the risk of harmful abstraction, and we are doing so, as I said, by 126 million litres through the amendment of water company abstraction licences, and rebuilding the water network with a record £104 billion investment to upgrade crumbling pipes and cut sewage spills. In light of all this, I hope noble Lords will not press their amendments.

Baroness Grender 

My Lords, I thank the Minister. It is very clear there is a strong feeling within this House that there is a need for something to shift and be enshrined in law. I beg leave to withdraw my amendment in order to hand over and support the right reverend Prelate the Bishop of Norwich if he decides to press his.

Amendment 93 withdrawn.

Amendment 94

Moved by

The Lord Bishop of Norwich 

Sharethis specific contribution

94: Clause 52, page 73, line 22, at end insert—

“(6A) A spatial development strategy must—(a) list any chalk streams identified in the strategy area;(b) identify the measures to be taken to protect any identified chalk streams from pollution, abstraction, encroachment and other forms of environmental damage; and(c) impose responsibilities on strategic planning authorities in relation to the protection and enhancement of chalk stream habitats.”Member’s explanatory statement

This amendment would require a spatial development strategy to list chalk streams in the strategy area, outline measures to protect them from environmental harm, and impose responsibility on strategic planning authorities to protect and enhance chalk stream environments.

The Lord Bishop of Norwich 

My Lords, I thank all who have contributed to this important debate and the Minister for her response. However, I am not convinced by her arguments; we cannot wait for a water reform Bill and have these arguments again at that stage. Amendment 94 seeks to protect chalk streams, this precious habitat which we are the custodians of. It aims to restore biodiversity and create a planning system that works with nature, not against it. At present, I am afraid, the Bill before us fails to do this for chalk streams. Thus, I seek to test the opinion of the House.

How dry is south-east England?

I enjoy Simon Cooper’s chalk stream focussed newsletters, for a variety of reasons, not least that they are well written, sardonic and interesting. No matter what he writes – unarguable truth or arrant nonsense – there’s never a dull moment.

On the 6th June Simon asked “where do all the water company fines go?”. Good question! The Conservative gov’t introduced the idea that these fines ought to go to improving the environment damaged by water company malpractice. But the sums aren’t ring-fenced. So, of the £242-million levied on the industry in 2022/23, only £11-million found its way into the Water Restoration Fund. We need to ask this question repeatedly: “who is trousering the fines?”

This week Simon is on the water company case again, lampooning Southern Water’s Tim McMahon. McMahon had claimed that the south-east of England was “drier than Istanbul”. Simon called this “Southern Water Fantasy Maths”. 

“McMaths,” he wrote “who probably hones his calculating skills watching endless repeats of the numbers game on quiz show Countdown had to perform two feats of contorted logic to arrive at this implausible claim. Firstly, he had to include the population of London in his calculations. The last time I looked our capital was most definitely not in the south-eastern portion of England but hey-ho Tim perhaps you are lining yourself up for a Nobel Prize double to include geography. Secondly, Tim has used the historic average for Istanbul rainfall but compares it to one of the driest periods on record for South-East England.”

In fact Tim had said to the BBC: “If you look at the south-east of England, it’s drier than Sydney, Istanbul, Dallas, Marrakesh. We have got a very densely populated area and we need to start investing to cater for that. We need to reduce customer usage. Otherwise we will have to put other investments in place, which will not be good for customers and might not be the best thing for our environment.”

If I were to pick that statement apart, it would not be to make a petty objection to the “drier than …” statement.

The point is kind of obviously rhetorical, not literal. Tim is also clearly referring to the geographical reality, not the regional concept. London is undeniably in south-east England. It is a region in itself, however, so it is not technically in the region described as “the South-East”.

To match the pedantry I looked up the “centre of England” and found it – deemed so by Ordnance Survey – to be a village in Leicestershire called Fenny Drayton, definitely above and to the left of London.

As for the rainfall, across the south-east of England it is generally a bit less than 650mm a year. Sydney’s average rainfall is 1150mm, Istanbul’s 820mm, Dallas’ 880mm, and Marrakesh’s average is 250mm.

So, McMahon was wrong about Marrakesh.

To his wider point, however: south-east England is undeniably dry. Why object to someone saying that blindingly obvious truth? 

And I’m glad Tim has pulled London into his justification, because it is around London that our chalk streams are most damaged by abstraction. That’s because there are too many tea-pots, basins, showers, loos, baths and gardens relative to how much rain falls in the Thames basin.

The Misbourne is regularly dry. As are the upper Beane and Darent. Abstraction in the upper Lea is 90% of average recharge. The poor-old Lea doesn’t really become a river until the Luton sewage works discharge. 

That’s why we do need investment, a national grid for water, pipelines, reservoirs and de-salination. The lot.

The part of Tim’s statement that is of concern is the idea that if we don’t trim usage we may have to put other investments in place, which might be bad for customers.

That’s the bit to focus on.

Demand reduction per head of itself solves only one problem: demand increase through development. On it’s own trimming customer usage just allows the government to build more houses.

To see chalk streams flowing naturally again, we need to reduce the amount of water we take out of chalk aquifers. And we can’t do that without investment.

Sophia’s petition

Last Friday afternoon 30th May Sophia’s petition “please don’t abandon the chalk stream recovery pack” passed 10,000 names. By Monday almost another 1000 names had been added.

This is fantastic news. It means that the government must now respond.

And maybe they have, to a degree. On Monday I met Minister Emma Hardy by a Yorkshire chalk stream. Many thanks to our guide Matt Arnold from the East Yorkshire Rivers Trust.

Though we were standing beside the Boston beck, perhaps one of the least pressured chalk streams in England, Minister Hardy was genuinely keen to know more about the multiple threats to chalk streams and what we should be doing to make things better.

We discussed the extreme levels of abstraction that exist on some chalk streams, especially those near London, and the suffocating nutrient pollution that comes from innumerable small sewage works where there is no phosphorous limit or where, if one exists, it is absurdly lax. We especially focussed on the lack of clarity in catchment level decision-making, something I feel the government could help with by unambiguously signalling the importance of chalk streams.

That signal should have taken the form of the Defra chalk stream recovery pack, of course, but I’m not holding my breath for a change of heart regarding its publication. Though you never know.

I will certainly continue to push, arguing why many of the measures in the pack were low-cost no-brainers: stuff that builds on existing policy with greater clarity and purpose, that would remove blockers in bureaucracy or give clear signals to water resource groups and water companies on where to prioritise abstraction reduction or target better water quality in vulnerable headwaters or that gives support to stakeholders.

My guess is that the treasury has put more or less everything on hold while it tries to prioritise growth through development.

This is worrying. Water efficiency through demand and leak reduction, for example – THE big plays in our national framework for water resources over the next two decades – means nothing for nature, unless accompanied by actual abstraction reduction. Of itself water efficiency simply makes headroom for development. And in the current climate this is almost certainly what it will be used to deliver.

Similarly, if the water industry is left to meet the previous government’s laudable nutrient reduction targets (as set out in the Environmental Improvement Plan) via “highest technical standards” at large works downstream of large population centres where highish standards exist already, then of course this will be the preferred “cost-effective” pathway for all parties.

All parties except fish and insects who might prefer those chemicals are removed upstream of where they live. The point is, you can create a great headline figure for phosphorus removal where it makes little ecological benefit, but why not direct the targets towards their purpose?

Without direction from government or its regulators on how to prioritise either abstraction or phosphorus reduction, economic efficiency of a decidedly anthropogenic kind will decide. River life will receive little benefit from initiatives intended to restore it.

Frustratingly, it’s all about economics – no matter who’s in charge – and so long as water is as cheap as it is, and so long as imaginative and economically-efficient ideas like Chalk Streams First or nutrient treatment wetlands or risk-based buffer strips (all measures a recovery pack might have given prominence to) are starved of oxygen, then nature will pick up the bill.

And thus the can is kicked down the road.

It doesn’t have to be this way. The chalk recovery pack would have been Defra’s first bespoke policy document for chalk streams. This government could yet dig it out, add some oomph to the stuff that got watered down, and defy my cynicism. No one would be happier to be proved wrong.

In the meanwhile, it was a pleasure to meet the Minister and I’m very much hoping we can meet again soon on one of the Flagship project sites, the Chess, for example where Kate Heppell is leading amazing citizen science research, or the Anton, where Simon Cain and Bob Wellard are concocting imaginative re-wilding schemes. And then perhaps the beleaguered Ivel which barely flows, or the Ver whose headwaters this winter have been constantly polluted with raw sewage.

The counter-intuitive (and heretical) idea that could unlock abstraction reduction.

It took me a while to get my head around the concepts in this post, so bear with me. This is aimed especially at eNGOs and other campaigners for chalk streams, because the more people there are who understand this counter-intuitve idea, the better. 

Here it is: you can save many chalk streams from unsustainable abstraction by conceivably using the aquifer in times of low flows and drought.

That is a head-muddler. But this idea could unlock real abstraction reduction, making the bad much better in the foreseeable future. This is far, far preferable in my view than holding out for a perfection (natural aquifers) that will never come.

It starts with my best attempt at explaining what I understand of the complexities of the interactions between groundwater, river flow and groundwater abstraction. Given that I vainly spent a long night in a hut in Iceland trying to explain the very same ideas to two angling friends of mine (they were belligerently uncomprehending in a (successful) effort to annoy me), this will be no easy task.

It is complex … kind of. It’s also quite simple really. Rather as the moon affects the tides, a simple idea leads to a complex set of manifestations.

Idea 1. Chalk streams flow from underground.

If you’re reading this blog you’ll already know that chalk streams derive most of their flow from groundwater. Rain sinks into the ground filling fractures in the underlying chalk and then lower down the slope it seeps out again as springs to create a chalk stream.

Idea 2. The level of the groundwater drives the flow in the river.

This is pretty simple. I used the bucket analogy before. Drill a single hole in the base of a bucket. Fill the bucket with water. As the bucket fills gravity drives water at an increasing velocity out of the hole. Now stop filling and let it empty. The flow diminishes to a trickle. EVERYONE gets this because it’s the same when you pee!

The rate of flow from springs in a chalk valley is driven by the hydraulic head of the groundwater above the springs. The higher the level, the greater the flow
… In more or less the same way as the water level in the bucket determines the force at which the water is driven through holes in the side of the bucket.

Idea 3. Groundwater rises in winter and falls in summer.

If you pour water into the bucket faster than water can leave it through the hole(s), the level in the bucket rises. If you stop pouring water in, the level falls as the bucket drains. This is exactly the same with a chalk aquifer. In winter, when it rains a lot, and it’s cold and the ground is wet and nothing is growing, more rain flows into the aquifer than can leave it and so the groundwater level rises. In summer, much less rain – if any – reaches the aquifer and so the groundwater level falls.

Groundwater rising. This chalk valley is dry most of the time but in February 2021 when recharge vastly exceeded discharge, it had filled to overflowing.

Idea 4. The higher the groundwater rises up the valley, the more the water pours out of it.

As groundwater level rises, stream flow increases. But not in a linear way as it would with a single hole at the base of a columnar bucket. In fact for every unit of rise in groundwater level, flow will increase by approximately X2 to 2.5 . Kind of like having twice as many holes at each level in the bucket as the level below.

There are a number of reasons for this which were debated at a recent groundwater conference. There is a summary of these ideas in Section 2 of John Lawson’s report Flow Recovery Following Abstraction Reduction which we updated following the conference and contributions from the likes of Rob Soley and Alessandro Marsili.

In short, this non-linear response is probably caused by a combination of: 

• the shape of the valley – if you imagine the groundwater filling the valley bottom and hillsides, assuming a perfect V- shape valley, for every unit increase the groundwater rises the area of saturated zone exposing springs rises two-and-a-half fold. Chalk valleys are not quite V-shaped but that’s the general idea.

• the fracture density in the chalk – which increases in the valley bottoms and with altitude. At depth chalk is very solid, but in the valley bottoms and higher up the slope and where water has flowed for thousands of years, the fracture density is much greater and the flow pathways are bigger.

• layering within the chalk – chalk accreted in layers under varying climatic / geological conditions and these layers are in turn interrupted by bands of clay and flint. These layers and the varying permeability and transmissivity can influence the way groundwater reaches with the surface.

• as the surface flow pathways lengthen (winterbournes rising higher and higher up the valley) the groundwater pathways shorten.

The fracture density and layering in the chalk, the shape of the valley and the length of flow pathways, all conspire to mean that when chalk valleys fill, flows will rise exponentially.

Idea 5. The impact of a constant groundwater abstraction has a varying impact on varying flows through the year

This is where things gets a bit more discombobulating. All of the above essentially means that as groundwater rises, flows increase exponentially. If that is true, then the reverse is true. For every unit of decrease in groundwater level, flows decrease exponentially.

This means …. drum roll … groundwater abstraction (which lowers groundwater levels) has a greater impact on high flows than low flows! This is a totally skull-tightening idea. Everyone thinks the reverse must be true. But it isn’t.

Groundwater levels and groundwater abstraction

Let’s start with the impact of groundwater abstraction on groundwater levels. In a natural aquifer system, the discharge from the valley must equal the recharge over time. Natural recharge = natural discharge / Time. This stands to reason: if it didn’t the valley would either fill to overflowing or empty (because over time one would exceed the other). 

Natural recharge derives from rain and natural discharge from river flow (and some evapotranspiration and flow through the ground). If I add another form of discharge in the form of abstraction, then the former natural discharge MUST go down. If it didn’t, the aquifer would progressively empty until there was no water left (an aside … hydrogeological literature generally describes anything less than draining the aquifer “sustainable”, because the aquifer is being lowered to a new dynamic balance, not mined. This is not the same as ecologically sustainable, however).

Look at it as simple numbers.

Natural recharge (10) = natural discharge (10) / Time.

Natural recharge (10) = abstraction (5) + natural discharge ? / Time.

What’s the new natural discharge? 5, obviously.

Now, as I showed with the bucket, the ONLY way in which the former natural discharge can go down is through a reduction in groundwater levels. If groundwater levels didn’t go down, then because the discharge is driven by the groundwater level the natural discharge would remain the same. As shown above, that is impossible.

Theis, the Isaac Newton of groundwater theory, wrote all this in 1940. The only way that the former natural discharge can go down (and balance the equation) he wrote, is by a reduction in the “thickness of the aquifer”. 

Okay, so pause and get your head round all that. 

• a single unit of rise or fall in groundwater level has a (very roughly) two-and-a-half fold impact on flows. 

• groundwater abstraction lowers groundwater levels.

ipso facto a single unit of reduction in groundwater level at high groundwater levels has a much greater impact on flows than a single unit of reduction in groundwater level at low groundwater levels.

It still hurts the head, but the discombobulating stuff above means that at high groundwater levels groundwater abstraction reduces flows by quite a lot more than 100% of the amount abstracted. And conversely, at low groundwater levels groundwater abstraction reduces flows by quite a lot less than 100% of the amount abstracted. Albeit over time groundwater abstraction must reduce flows by (essentially) 100% of the amount abstracted (it’s generally less than that for reasons that aren’t that important to the general concept, but basically because not all discharge occurs in the form of flow).

See the chart below to see what the Chalk Streams First modelling indicates % flow recovery would be if abstraction was reduced to zero in the River Ver. It varies through the flow cycle.

The above chart from Page 52 of John Lawson’s report shows that the % flow recovery (green line) at high flows (l/h end of X axis) is well over 100% and at very low flows (r/h end of X axis) is about 30% – 20%.

Idea 6. Groundwater abstraction at low flows is like a credit card.

The obvious question is … if groundwater abstraction at low flows reduces those flows by a lot less than 100% of the amount being abstracted, where the bloody hell is the rest of the water coming from? The answer: if it’s not a direct reduction from flows at the time, it is coming from aquifer storage.

This is easy to understand if you think of a large abstraction next to a small and diminishing stream. In the winter when the stream is gushing, there is more than enough water to satisfy the pumping. In the summer the stream reduces to a trickle or perhaps even dries up. But the pumping continues. At this point the abstraction is clearly not taking water from stream flow because there isn’t any. Another aside … I’ve read hydrogeologists describe this state as abstraction having “no further effect on flows”. This might be literally correct at the time. But it is misleading. The abstraction is effecting future flows. 

When a chalk stream dries but abstraction continues it is clear that the abstraction is no longer subtracting water from the river’s flow, but from aquifer storage: this is basically a debt to future flows.

At times of low flow and into droughts, groundwater abstraction increasingly draws on storage, upon which future flows are built. If you unnaturally drain the aquifer, it will clearly take longer to fill when it starts raining again, all before the flows in the river can respond to the rise in groundwater levels.

Therefore groundwater abstraction at low flows is like a credit card: much more a debt against future flows than an impact on present flows. This is a key idea behind the confusing concept of using groundwater abstraction to unlock abstraction reduction .

Idea 7. If you turn off the pumps you get greater flow recovery at high flows than low flows.

Essentially what all this means is that when you cease or lower abstraction you get well over 100% of the amount no longer abstracted at high flows and much less than 100% at low flows. That is what the chart above shows on the River Ver.

And this is the Achilles Heel of the Chalk Streams First idea. 

Water resources needs a constant supply of water. Groundwater abstraction gives that. Chalk Streams First says “turn off (or down) the pumps and take the water from river flows much lower down the catchment”. And while you get loads of water back in winter, you get less back in summer. Generally, you must have a storage reservoir to make it work and balance out the varying recovery rates into a constant and reliable supply. 

John Lawson – who came up with the Chalk Streams First idea – has long known this. We argue (with empirical evidence) that the flow recovery at low flows is actually much higher than the most pessimistic predictions claim, but nevertheless this variation in response is an issue we have to address. The answer is a reservoir.

BUT … then you get to the prolonged droughts when water companies are under real pressure. In these times, the flow recovery could conceivably drop even lower. What to do? The public must have water. This low flow recovery at very low flows in long droughts threatens the whole idea of reducing abstraction through schemes like Chalk Streams First. Especially now that we have to plan according to 1:500 year contingencies.

Idea 7. In droughts use groundwater abstraction to guarantee public water supply … so long as you’ve turned the abstraction right down to ecologically sustainable levels 95% of the time.

The insurance against the Achilles Heel of low flow recovery in a drought is a groundwater-fed public water supply scheme. There is one in existence already called the West Berkshire Groundwater Scheme (WBGWS). It is a series of wells in the Berkshire chalk that can, in extremis, be turned on and deliver a large amount of aquifer water into the Berkshire chalk streams, from where it flows to the Thames to be captured into the London reservoirs. The scheme is used very, very rarely: no more than once every 25 years. But it’s there. And it guarantees water in a drought.

The West Berkshire Groundwater Scheme wellfield: this scheme is rarely used but guarantees water in extreme droughts. It is a counter-intuitive idea that could unlock abstraction reduction in the Colne, Lea and Ouse chalk streams.

The impacts on the chalk streams are a) one of flow relief in the drought, because the flows get boosted. Albeit – and I have to emphasise this – flow augmentation in not the aim of the scheme, it is a bi-product. And b) at the end of the drought, when the pumps are turned off, the aquifer must recover before flows return to natural levels, so you get lower flows the following year.

But this is crucial: in modelled scenarios, the flows in the year of recovery are still better than they would be if abstraction ran all the time as happens at the moment in streams like the Ver, Misbourne and Beane.

So WBGWS type schemes could unlock Chalk Streams First type abstraction reduction in other settings, such as on the chalk streams of the Colne, Lea and Ouse (even the Darent). As such a scheme would insure against the public supply deficit in droughts created by replacing upper catchment groundwater abstraction with lower catchment surface water abstraction (the Chalk Streams First concept).

BUT …the Environment Agency is very cautious of such schemes

This is understandable because there have been some bad schemes in the past. But flow augmentation to compensate for the collateral damage of abstraction is a different thing altogether. 

Some schemes were developed in the past whereby to compensate for abstraction (which had dried the stream) water was pumped from the aquifer into a losing reach of stream and the whole thing was a highway to nowhere.

Other times the concept of augmentation is used to justify continuing, unsustainable abstraction. These schemes have given the whole idea of flow augmentation a bad rap, and one that has stuck like glue.

RevIvel claim that a flow augmentation scheme putting 0.5 ml/d into a dry river bed is not a good type of augmentation scheme, especially if it delays a proper solution to the unsustainable abstraction. This is the kind of scheme is very different from the idea promoted in this blog post.

BUT, I would argue that we need to be more pragmatic and open minded than a presumption against these schemes if we are to achieve the heretofore irreconcilable goals of reliable public water supply and restored chalk streams. Aquifers in the south east are managed one way or another. We need to make sure they are managed mindfully to achieve the specific outcomes we want and in this regard holding out for “natural” when a more flexible approach would unstick hopeful schemes such as Chalk Streams First would surely be counter-productive?

I understand the Environment Agency may be consulting on this topic later in the year. I know from many discussions I have had with chalk stream advocates that the ideas I have outlined above will be surprising and counter-intuitive to most of us, as indeed they are to me.

But it is vital we give the EA the encouragement to take a flexible, if ultra cautious approach, because the gains of doing so could be massive.

Two steps forward, three steps back?

Why, oh why has the Environment Agency asked Affinity Water to turn abstraction pumps back on in the River Chess catchment?

In the late 20-teens John Lawson came to me with a great idea that could end over-abstraction in many chalk streams, especially those near London. He explained how in the next ten years or so Affinity Water would be building a pipeline to connect their southern region (south of the Thames) where they have more than enough water, with their northern, where they do not. This pipeline, said John, would enable the wholesale reduction of groundwater abstraction in the chalk stream tributaries of the Colne: iconic streams like the Ver and Chess that have been far too heavily abstracted for over half-a-century. And maybe the chalk streams of the Lea too.

If you turn the groundwater pumps off, a lot of the water you “leave in the ground” so to speak, comes back as flow in the stream. With a pipeline you could abstract the water at the lower end of the catchment instead, store it in reservoirs (of which there are several in the London area) and take the water back to the places it came from, to be used as public water supply. The difference being that this way, the rivers actually get to flow. We called John’s brilliantly simple idea “Chalk Streams First” because it gives the river first use of its water. With the support of a coalition of eNGOs we started trying to interest the water companies, the Environment Agency and Ofwat-Rapid (Regulators Alliance for Progressing Infrastructure Development).

Rapid was interested from the start. Paul Hickey, who directs Rapid, is passionate about ensuring we actually deliver on our environmental ambition. The Environment Agency was interested too. Even Affinity Water took to the idea, especially once the Environment Agency indicated that it might allow some variations on the theme and flexibility with licence relocation favoured by Affinity’s very clever technical guru, Doug Hunt.

The introduction of the Grand Union Canal transfer scheme promised to underwrite any losses to public supply (ie. disparity between what you no longer abstract at the top end and what you get back at the lower end of the streams) and thus Affinity Water started to build abstraction relocation into their business plan. They will address the Colne chalk streams to start with, but in due course all the chalk streams of the Lea could also be included. The first shots, the prequel shots in fact, were fired in 2020 when Affinity Water voluntarily shut down their Alma Road abstraction on the River Chess.

Through these same years the CaBA chalk stream strategy has gained momentum, with support from Defra, the water industry and all stakeholders. The Colne version of Chalk Streams First promised to become a national flagship for how to realign abstraction, put the environment first, but still take account of public supply. Literally everyone liked the idea. Who in their right mind wouldn’t?

So why, in the name of all that is Holy, has the Environment Agency asked Affinity Water to resume abstracting from Alma Road at a rate of up to 7 million litres per day, without much in the way of explanation (at first) or consultation (thus far)? The decision itself seems bizarre. The way it has been handled given how the plight of our chalk streams has touched the national consciousness and has been debated in Parliament, is clumsy, to put it politely.

In the interests of fairness, I ought to say that the Environment Agency has now explained that this request was made of Affinity Water in order to conduct a five-year modelling exercise to study the relationship between abstraction, groundwater levels and fluvial flood risk in the Chess catchment. Note the words I have placed in italics.

The River Chess has historically suffered from excessive abstraction which has reduced flows in the river and sometimes caused it to dry up altogether in its upper reaches. As with other Chilterns streams groundwater abstraction climbed massively through the 20th century, in the Chess from a minimal 2.5 Ml/d in the 1920s to a peak of over 20 Ml/d between 2008 and 2018, almost 38% of the average aquifer recharge, placing it amongst the highest impacted chalk streams in the country (in the more impacted, such as the Ivel and Darent, abstraction exceeds 50% of recharge).

The cessation of the Chartridge and Alma Road abstractions has reduced the overall catchment abstraction to more like 25% of aquifer recharge: still far too high, but enough to show noticeable benefits.

The River Chess Association report that otters, water voles, brown trout, water crowfoot, mayfly and rare invertebrates such as the winterbourne stonefly have all returned to Chesham. In fact nothing monitors improving river health more effectively than invertebrates. The Association has been recording river-dwelling invertebrates in Chesham since 2009. In recent years species previously unseen in Chesham have been recorded, including mayfly (Ephemera Danica), caseless caddis (Rhyacophilidae ), turkey brown (Paraleptophlebia submarginata), and the nationally rare winterbourne stonefly (Nemoura lacustris).  

Personally, I remember taking photographs in Chesham of a dry river in May 2017 and of a flowing river full of ranunculus in August 2022. The Chess stood for hope.

The River Chess a mere puddle in 2017
The same reach in 2022

So why toss that all away? The stated explanation seems feeble. When asked by the River Chess Association what reasoning and data were behind the decision, the Environment Agency replied:

“The Environment Agency used their current understanding of the relationship between groundwater abstractions, groundwater levels, and river flows in the Chess catchment. This included information from two reports … which concluded that there is a relationship between groundwater abstraction and river flows. Based on the conclusions from both reports, a potential increase in fluvial flood risk [arising from a reduction of abstraction – my clarification not EAs] could not be ruled out. Implementing temporary adaptive abstraction, as set out in the operating agreement, minimises the potential impacts of abstraction reductions on fluvial flood risk until these impacts are better understood and managed.”

This states the obvious – that there is a relationship between abstraction, groundwater levels and flows – and presents it as an explanation. Of course there is a relationship! That’s why we want the abstraction to be reduced, to increase flows in the river and thus river health. In as much as it is an explanation it seems to be saying that the resumption of abstraction will be used to assess if abstraction can be used to reduce flows in the river, and via this reduce the risk of flooding.

Taken at face value this is very strange reasoning. The idea appears to be to use abstraction to reduce flows in the river. Despite what the EA state about adaptive abstraction* in the operating agreement I wonder a) if repurposing an abstraction licence from its use for public water supply to a different use of so-called flood-risk mitigation is within the remit of the licence and b) whether it is entirely legal under WFD legislation to deliberately reduce the flows in the river in order to theoretically reduce flood risk.

(*adaptive abstraction essentially comprises the variation of pumping rates across time, but I’ve only ever heard of the idea as a means to reduce ecological damage, which is the unfortunate by-product of the public water use, the reason why the licence exists. The EA’s idea here is actually putting the abstraction to a entirely different use than intended by the existing licence)

But these queries aside, this plan is not even a good way to reduce fluvial flood risk. Of course flooding is related to flows (and flows to groundwater levels), but in a chalk stream fluvial flooding is much more likely to be influenced by things such as impoundments, culverts, drainage, ditching and land use in the upper catchment. The EA would be far, far better off looking at these issues in order to mitigate fluvial flooding.

And that aside, using groundwater abstraction as a temporary measure to reduce fluvial flooding is like blowing the other way in order to slow down a tanker. The impact of groundwater abstraction accumulates over time and its impact on flows is geared via its impact on groundwater levels. By the time you realise you might have to reduce groundwater levels to reduce flows it is too late. You could only reasonably make this idea work if you run the abstraction all the time and reduce flows all the time, which is exactly what groundwater abstraction does.

Besides, where are they going to put all the water? Pump it downstream?

To me this feels like a nonsense explanation.

As anyone with a Twitter account knows, the sewage works at Chesham spills groundwater ingress sewage all the time when groundwater levels are high. In other words the groundwater spills through cracks in the pipes and overwhelms the sewage works. It is almost certain that the increase in groundwater levels that has followed the reduction in abstraction has increased the groundwater sewage spills (that and some very wet winters).

Is this really about modelling something we know all about already (the relationship between abstraction, groundwater levels and flows, which it is perfectly possible to accurately model), or is it a designed to see if the groundwater ingress flooding can be reduced by resuming abstraction?

You decide. Maybe I’m being too cynical. But if my suspicions are correct the EA would be trying to play tunes on the theme of ecological damage, resuming one form of damage to reduce another and I’m not sure that’s such a great idea. Or maybe Defra is exploring ways to meet its own stormwater reduction plan targets for chalk streams? These pesky groundwater ingress discharges are going to be a hard nut to crack.

If the issue really is fluvial flooding, where is the risk occurring exactly? And why not consult the Chess Association, and the Chilterns Society / chalk streams project to explore how the flood risk could be addressed without pumping all the groundwater away? I will be happy to publish any reply or further explanation from the EA.

Water policy manager Ali Morse looks at why the Environment Act phosphorus-reduction target could fail to deliver improvements in the chalk stream reaches where it’s most needed.

Today I am posting a guest blog by Ali Morse – water policy director at the Wildlife Trust and chair at Blueprint for Water – on why it is so important to ensure our new, ambitious phosphorus reduction targets are applied to the parts of the landscape where we will see the greatest ecological benefit for the money spent. It’s astonishing to think that although we have been spending millions reducing phosphorus from sewage (66% reduction 1995 to 2020 … and now a new target of 80% reduction 2020 to 2038) we still haven’t found a way to ensure that we reduce phosphorus from the small works in the upper reaches of rivers where the reductions would have the greatest ecological outcome. Essentially, ever since the UWWTD (Urban Wastewater Treatment Directive) was passed to drive these reductions, cost-effectiveness has been measured by population attached to a given works as opposed to for example: % length of river d’stream of the pollution source, or the volume of flow in the receiving waterbody relative to the volume of flow from the pollution. This doesn’t make sense. We create targets to reduce phosphorus because it has a negative ecological impact: the primary outcome should surely be, therefore, to minimise the ecological impact, regardless of the local population size. In practice we reduce phosphorus in such a way that the ecological impact its secondary to accounting methodologies. This means we have rivers like the Frome in Dorset (a SSSI chalk stream) where the phosphorus concentrations go down as you travel downstream and are lowest just above the estuary (see the map below which I drew up when working on the chalk stream strategy, (based on 2016 WFD data)). It cannot be rocket science to find some simple policy drivers that would make the difference. All the river-oriented eNGOs should take a united front on this in my view, change the raw-sewage record for a few turns of the dance floor, and implore government to develop a way to maximise the ecological outcome for their ambitious Environment Act targets.

Here’s Ali’s excellent blog, first paragraph with a link across to the Wildlife Trusts site: