Interruption to your water supply - UB7 - West Drayton
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You are here : At Home > My Water > Water cycle
The normal recharge period is between late October/November and March/early April.
This is when rainfall is most effective at replenishing the aquifer, resulting in a rise in groundwater levels. The chalk aquifer is where approximately 60% of our water for public supply comes from.
During the summer months when temperatures are higher and plants are using water, rainfall is less effective at recharging the aquifer. The exceptionally wet Spring and early Summer of 2012 did result in a rise in groundwater levels but this was unprecedented.
We use a number of Environment Agency monitoring boreholes across our supply area to assess our water resources situation. We also have an extensive network of environmental monitoring associated with our National Environment Programme.
Our supply area is home to many chalk streams. These are globally rare habitats, rich in biodiversity. The upper reaches of a chalk stream are known as winterbournes, as they naturally dry out as groundwater levels decline.
When groundwater levels rise again, flow returns to this part of the river. Chalk streams have also been historically modified e.g. straightened, deepened, widened, which makes their habitat less suitable. We are working with the Environment Agency and other catchment partners to try and enhance and restore a number of chalk streams.
We made a customer commitment in our AMP6 Business Plan to leave more water in the environment to try and help benefit these chalk streams. We have already reduced the amount of water we take from the environment by 6.7 million litres per day between since 2015 and are on target for further reductions in abstraction 2017 and 2018.
We have a Drought Management Plan which is an operational plan that we follow under drought conditions.