A dry spell is a weather event. Whether it becomes a serious supply problem also depends on what we built, maintained and planned before it arrived.
Britain's reputation for rain can obscure that distinction. Rainfall varies by place and season, and the water needs storing, treating and moving to where people use it. A wet national average doesn't guarantee a secure supply to every growing community.
Capacity takes years
England went decades without completing a major new reservoir. Havant Thicket represents an important addition after that long gap. Population, demand and the pattern of rainfall have meanwhile continued changing.
Reservoirs aren't the only answer. Reducing leakage, managing demand, transferring water and developing other sources can all contribute. Each option has costs and constraints. The failure would be to postpone the decisions until restrictions become the only immediate response left.
Long-term investment is difficult where costs arrive now and benefits may appear years later. That makes the way companies are financed and regulated important. It doesn't establish that every executive deliberately chose dividends over a particular reservoir; individual decisions need evidence.
Building has costs too
A reservoir can mean losing land, habitats or a place people value. Those objections deserve a hearing. They don't remove the need to compare the loss with the consequences of refusing the project.
Planning delays, company incentives and regulatory choices can interact. No single institution should be able to point at another part of that chain and assume its own responsibility has ended.
By the time a hosepipe ban is needed, a reservoir can't be built in response to the next forecast. The useful questions concern the decisions made years earlier: what need was anticipated, what options were considered and why the chosen capacity was judged sufficient.
Weather can be unusually difficult. It shouldn't become an explanation that spares everyone from examining whether the supply system was prepared.