Hosepipe Bans Loom Without Smarter Planning

Climate Change: Water in the Wrong Places, at the Wrong Times

Water scarcity is not the absence of water. It’s the failure to store, move, and manage water effectively. In a climate-altered Britain, the problem is not just less rainfall, but increasingly erratic patterns of where and when it falls.

• Prolonged dry spells like the one unfolding now reduce river flows, damage crops, and elevate wildfire risk.
• Sudden intense storms, conversely, overwhelm traditional drainage systems, triggering flash floods and sewer overflows.

In both cases, the water is lost — too much, too fast, and in the wrong place. This paradox — simultaneous flood and drought risk — is the new normal, and it demands a complete rethink of how we approach water resilience.

Cracks in the System: What the Hosepipe Warnings Reveal

While Southern, South East, and Thames Water have stopped short of imposing restrictions (so far), they’re issuing stark warnings. A hosepipe ban is no longer a once-a-decade measure; it has been enforced in parts of the South East for the past two consecutive years.

At the same time, water bills are rising fast — an average £86 increase this year alone, and a 36% hike approved over five years to fund a long-overdue £104 billion upgrade to the sector. Southern Water customers face an even sharper rise of 53%. Yet, many of the core inefficiencies — particularly around rainfall capture and local supply — remain unaddressed.

Unda believes this moment highlights the gap between centralised infrastructure planning and localised, adaptive water solutions.

Smart Water Management: Designing for Resilience

Addressing this imbalance calls for systemic change. No single solution will suffice — the answer lies in layered, place-based strategies that make use of every drop. Three key areas of intervention stand out:

1. Sustainable Drainage Systems (SuDS)

SuDS are now a familiar concept in planning circles, but their full potential remains underused, particularly in retrofitting urban landscapes. SuDS components — such as:

• Bioretention areas
• Permeable pavements
• Swales and infiltration trenches
• Rain gardens and green roofs

…work by slowing and treating runoff, allowing more water to percolate into the ground, recharge aquifers, and support biodiversity.

Beyond flood mitigation, SuDS reduce pressure on sewers, improve water quality, and enhance public amenity. In regions prone to both surface water flooding and water stress — like much of the South East — SuDS should be seen as essential infrastructure, not optional enhancement.

2. Rainwater Harvesting and Greywater Reuse

Rainwater harvesting offers a simple premise: capture rainfall before it’s lost, and store it for non-potable use. From garden irrigation to toilet flushing, these systems can reduce mains water use by 30–50% in domestic settings, and more in commercial or industrial contexts.

Meanwhile, greywater reuse systems (recycling water from sinks, showers, and appliances) are underutilised in the UK compared to Europe and Australia. Wider uptake would ease summer peaks in demand, reduce sewer loading, and defer the need for costly supply expansions.

3. Integrated Water Strategies in Planning and Development

We need a planning system that fully internalises water risk — treating water scarcity and flood resilience as material considerations across all scales of development. Key actions include:

• Mandatory integration of SuDS and water efficiency standards in all new builds.
• Funding and incentives for retrofitting public buildings, schools, and housing associations with harvesting and storage systems.
• Joined-up planning between water companies, local authorities, and developers to align long-term water availability with growth areas.

Behavioural Change is Part of the Picture — But Not the Whole Solution

Campaigns to encourage shorter showers and reduce garden watering are helpful and necessary, especially during critical periods. But these should not distract from the underlying structural issues. Consumers are being asked to cut back, while much of the water system remains leaky, fragmented, and slow to adapt.

Real resilience will come not from austerity, but from redesign — transforming our homes, developments, and public spaces into water-smart environments that store, filter, and reuse water at every opportunity.

Looking Ahead: A Water-Secure Future for the South East

With climate projections pointing to hotter, drier summers and wetter winters across southern England, the urgency for water resilience has never been greater. But there is opportunity in this challenge.

By embracing nature-based solutions, circular water principles, and place-sensitive planning, we can design our way out of scarcity — creating greener, cooler, more liveable communities in the process.

At Unda, we are helping developers, landowners, and local authorities navigate this transition. Whether assessing flood risk, advising on SuDS integration, or supporting climate adaptation strategies, our work is driven by one guiding principle: a water-smart future is not only possible — it’s essential.