<h4>2014</h4>

<p>Portsmouth Water has no large raw water storage reservoirs. We rely almost entirely upon groundwater reserves in the chalk aquifers of the South Downs and we abstract our raw water from wells, boreholes and springs. We have one river abstraction at Gaters Mill on the River Itchen, a chalk river with a groundwater baseflow.</p>

<p>Those reserves rise and fall with the seasons and so Portsmouth Water pays particular attention to the local hydro-geological data by monitoring rainfall at our Head Office, groundwater levels in the chalk at Idsworth on the Hampshire/Sussex border, as well as the total yield from the natural springs at Havant and Bedhampton.</p>

<p>The resources are monitored on a daily basis and annually reviewed for comparison with long term performance.</p>

<p>The information gathered is reproduced here for information purposes; no guarantee is given as to its accuracy.</p>

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