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Groundwater extraction<h2 class="sectHeading">About</h2><p>Groundwater extraction involves extracting water from underground water catchment areas. It involves drilling a hole deep into the ground, followed by fitting a pump into the well and pumping up water from the ground. These wells are called aquifers.</p><p>The first groundwater supply project from the Table Mountain Group aquifer, next to the City’s Steenbras Dam, was launched on 5 August 2020. Watch the video to find out more.</p><div class="responsive-media"> <iframe src="" frameborder="0"></iframe> </div> <span> <div class="notification with-heading dark-copy light-blue bg-light-grey"><div class="graphic with-border"> <i class="info fastfact"></i> </div><div class="desc"><h4>Fast fact</h4><p> <b>An aquifer</b> is a body of rock that can contain large amounts of water which collects beneath the earth’s surface. The water comes from rain, melting snow and ice, and fills spaces in soil and rocks. The water is pumped to the surface, filtered and brought up to National Water Standards (NWS).</p></div></div></span> <h2 class="sectHeading">Accessing groundwater</h2><p>Groundwater extraction is a complex procedure based on scientific principles and detailed research.</p><h4>The process of accessing and managing groundwater safely consists of five phases:</h4><ul><li> <strong>Mobilisation: </strong>this looks at the relationship between surface water and groundwater and checks to see if existing water can be used more efficiently. </li><li> <strong>Planning:</strong> existing studies are sourced and boreholes inventoried to determine the amount of available groundwater. </li><li> <strong>Exploration:</strong> this involves exploring the areas, drilling for groundwater, then sampling and analysing the results. </li><li> <strong>Production: </strong>during this phase we drill, test and equip the boreholes. </li><li> <strong>Extended close-out phase:</strong> this entails monitoring the systems that were created during the mobilisation phase, to ensure the aquifer is working at its best capacity. </li></ul> <span> <div class="notification with-heading dark-copy pink bg-light-grey"><div class="graphic with-border"> <i class="info note"></i>  </div><div class="desc"><h4>Please note</h4><p>Any groundwater extraction process must be strictly managed to prevent resources running out and to limit environmental impact. A Water Usage Licence (WUL)is required from the National Department of Water and Sanitation, which provides guidelines, such as how many volumes of water can be extracted. </p></div></div></span> <h2 class="sectHeading">Aquifers</h2> <figure class="subtopic-fullsize-img"><img class="responsive" src="" alt="" style="width:949px;" /></figure> <p>​​We are focusing on three main aquifers: </p><h4> Atlantis-Silwerstroom Aquifer</h4><p>Atlantis is already supplied with some water from the Atlantis-Silwerstroom Aquifer. Water is pumped from two groups of boreholes, one in Witsand and Silwerstroom Strand.</p><p>The City’s long-term aim is to supply Atlantis from groundwater only. This will be achieved by developing the wellfields (group of boreholes) in Silwerstroom Strand and gradually reducing reliance on the bulk water supply from the Voëlvlei Dam. </p><p>Work is underway to increase the amount of water Silwerstroom Strand can produce by upgrading the original infrastructure and adding a water treatment facility. We are also investigating increasing the number of wellfields in the area. </p><h4> Cape Flats Aquifer</h4><p>The Cape Flats Aquifer stretches over 400 km²​, from False Bay to Tygerberg Hills and Milnerton and, due to its size, aerial and land-based geophysical surveys have been used to better understand its formation. </p><p>The groundwater level varies greatly in this region. In some areas, it is close to the surface resulting in wetlands, while in others, the groundwater is situated 800 - 1 000 metres below the surface.</p><p>As there are no dams in this area, any water extracted from the boreholes will be piped directly to the closest water treatment plant. The boreholes are expected to produce five million litres a day but this may increase incrementally.</p><p>The Cape Flats Aquifer is very important to the long-term water security of Cape Town and we have plans to recharge the aquifer. </p><h4> Table Mountain Group Aquifer</h4><p>Table Mountain Group Aquifer is the biggest of the three aquifers. It consists of a number of aquifers that stretch from the Southern Peninsula to the Hottentots Holland Mountains and beyond. It produces about two million litres of water per day but this is expected to increase incrementally.​</p><p>We will initially start drilling boreholes in the basin of several of the dams in the Helderberg Basin area, including Steenbras and Theewaterskloof, which will allow the water to be pumped directly into the dams. </p><p>We will continue working on a range of plans and fast-track processes as much as possible to bring groundwater extraction online. Our aquifers and underground water catchment areas are a key component in helping to offset our reliance on our dam water storage, helping us to build a more water-resilient city.</p><h2 class="sectHeading">Contact us </h2> <span> <div class="notification with-heading dark-copy pink bg-light-grey"><div class="graphic with-border"> <i class="info note"></i>  </div><div class="desc"><h4>Please note</h4><p>WhatsApp is currently unavailable for water fault reporting.</p></div></div></span> <ul><li> Email: <a href=""></a></li><li>Online: through our <em><a href="" target="_blank">Service R​equest tool<i class="icon link-external"></i></a></em></li><li>SMS: <em> <a>31372</a></em> (<em>free SMSes do not apply</em>)</li></ul>GP0|#e73e37c1-405e-4d47-b681-be43ec1abcaa;L0|#0e73e37c1-405e-4d47-b681-be43ec1abcaa|Groundwater extraction;GTSet|#ef3a64a2-d764-44bc-9d69-3a63d3fadea1;GPP|#b7d85630-8bda-4b28-adc9-6def4cb10e31;GPP|#a3964d56-b74d-4d64-95c1-ff381a88a277;GPP|#245ec7aa-a528-4cd3-bcac-597c292db711;GP0|#a9e81dff-114c-44e9-847a-5ca4a0201d92;L0|#0a9e81dff-114c-44e9-847a-5ca4a0201d92|Groundwater extraction;GPP|#dc7d603c-ae6b-49eb-8ff7-8f48e6169510;GPP|#99fac000-f3ac-4774-9ffd-e5e59a130e21;GPP|#e88ff549-973f-4e3c-a46c-cfbe61bd6a24Find out more about groundwater extraction.0



Groundwater FAQs404900GP0|#7d9df7be-4d49-4007-95e2-153219f9c783;L0|#07d9df7be-4d49-4007-95e2-153219f9c783|FAQs;GTSet|#f1e8889f-f7d7-4d5b-a3f5-af0ca2e076ea;GPP|#d8892104-ce90-493e-b813-93c488f4b1d3;GPP|#0972c695-fd19-46c4-ab5d-9601f17b780e2020-08-03T22:00:00Z



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