WMS How to navigate page. Background South Africa’s water source areas produce disproportionately greater volumes of water in relation to their size. Only 10% of our land provides us with 50% of our surface run-off (water in wetlands, streams and rivers). One of these strategic water source areas is the Table Mountain Water Source Area (TMWSA) in the City of Cape Town Metropolitan Municipality. This is an easily understandable dashboard to present groundwater information of the TMWSA on a map, which is derived from an up-to-date groundwater database set up and maintained from various sources of data. For more information on the South African water source areas visit this webpage. ]]> infoMapAccessService groundwater database water source areas table mountain Klaudia Schachtschneider (WWF South Africa) Table Mountain Water Source Partnership pointOfContact +27 21 657 6600 KSchacht@wwf.org.za conditions unknown None 3000 3000 text/xml image/jpeg image/png image/png; mode=16bit image/png; mode=8bit image/png; mode=1bit application/dxf text/plain text/html text/xml application/vnd.ogc.gml application/vnd.ogc.gml/3.1.1 application/json application/geo+json image/jpeg image/png application/json text/xml text/xml XML wwf_gw_db How to navigate page. Background South Africa’s water source areas produce disproportionately greater volumes of water in relation to their size. Only 10% of our land provides us with 50% of our surface run-off (water in wetlands, streams and rivers). One of these strategic water source areas is the Table Mountain Water Source Area (TMWSA) in the City of Cape Town Metropolitan Municipality. This is an easily understandable dashboard to present groundwater information of the TMWSA on a map, which is derived from an up-to-date groundwater database set up and maintained from various sources of data. For more information on the South African water source areas visit this webpage. ]]> infoMapAccessService groundwater database water source areas table mountain CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.160397 18.711631 -34.225525 -33.853379 cape_town_wsas South Africa has 22 water source areas (WSA) spread across five provinces (KwaZulu-Natal, Mpumalanga, Western Cape, Eastern Cape and Limpopo). The total size of our water source areas is 12.32 million hectares. A number of these areas extend and are shared with Lesotho and Swaziland; approximately 1.91 million hectares in Lesotho and 0.93 million hectares in Swaziland. The water source areas around Cape Town in the Western Cape are the Table Mountain Water Source area in the west, the Table Mountain and Peninsula WSA in the centre and the Peninsula and Cape Flats WSA on the eastern side of the Cape Town metropolitan area. These are identified by secondary quaternary catchments, which were created by evaluating a digital elevation model, and which may not coincide 100% with the "official" quaternary catchment boundaries. For more information on the Table Mountain Water Source area please also visit this <a href="https://www.wwf.org.za/our_work/initiatives/water_source_areas/" target="_blank">webpage</a> and this <a href="https://water.cer.org.za/areas/table-mountain" target="_blank">webpage</a>. For general information on how the water source areas are defined read the documentation website by clicking on the button below. Cape Town Table Mountain Cape Flats Water Source Area CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.307212 18.677182 -34.227602 -33.824543 application/pdf monitoring_networks CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.318317 18.690034 -34.203224 -33.870698 tmwsa_mon_bhs These are the boreholes/wells specifically selected for the groundwater monitoring in the Table Mountain Water Source are. They should be representative for monitoring the groundwater conditions in the area in which they are. A borehole is a constructed hole in the ground from which groundwater can be abstracted, recharged or observed. A well or wellpoint is similar to a borehole, but normally larger in diameter and often only a few metres deep. They are used for the extraction of shallow groundwater, sometimes located in rivers/streams extracting the shallow groundwater from the river bed. CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.3275 18.621865 -34.201497 -33.933172 wl_monitoring Groundwater level monitoring boreholes belonging to the HYDSTRA monitoring network of the Department of Water and Sanitation (DWS). Currently only some monitoring stations have "real-time" monitoring data available, but a longer term record can be viewed by going to the NIWIS website, where one can zoom to the relevant station manually. All the Department’s monitoring data is firstly uploaded and acts as DWS main database. This includes logger data, hand measurements and real-time monitoring data. From HYDSTRA groundwater data is then exported to the National Groundwater Archive and NIWIS or for any other use. The NGA, for example, receives only one measurement value for a geosite per day although all the 12 min. Readings are available on HYDSTRA. monitoring groundwater borehole water level NIWIS HYDSTRA CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.53096 18.6432 -34.08374 -33.902 text/html other_mon_bhs Other monitoring boreholes in and around the Table Mountain Water Source Area. Some of these have data loggers installed, which are continuously measuring various parameters, including the water level. Others are only monitored on a monthly or quarterly basis. Quite a number of these have been mothballed and are no longer monitored. CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.45563 18.690033 -34.07027 -33.870699 monthly_rainfall At a few selected sites daily rainfall is recorded, but in this database stored as monthly rainfall. The histogram charts represent monthly averages [mm] in different colours, starting with January on the left through to December. The height of the histogram is determined by the total annual rainfall compared to the other stations. Not all stations have long-term records (from the 1950s), mostly derived from the DWS, some only from 2000 (SYNOP/BUFR data from Meteomanz) or the middel of 2018 (generally from the SAWS). All stations' rainfall records are updated on a regular basis, thus improving the statistics. The Binary Universal Form for the Representation of meteorological data (BUFR) is a binary data format maintained by the World Meteorological Organization (WMO). SYNOP (surface synoptic observations) is a numerical code (called FM-12 by WMO) used for reporting weather observations made by manned and automated weather stations. Most South African weather stations are part of the WMO network. rainfall evaporation monitoring observation CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.3192 18.6 -34.16673 -33.9206 text/html mon_areas The monitoring areas can contain boreholes/wells, springs and rainfall stations. These areas have been selected to contain monitoring stations, which are representative of the conditons in that area. Several clusters of stations have been identified and these may be used to view statistics for monitoring station data like water levels and rainfall data. CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.318317 18.661039 -34.203224 -33.881983 other_geosites CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.319199 18.763271 -34.248521 -33.727169 other_bhs_wells_dugwells These are all the boreholes/wells/dug wells in and around (10km radius) the Table Mountain Water Source Area. They include the TMWSA monitoring boreholes for the sake of completeness. A borehole is a constructed hole in the ground from which groundwater can be abstracted, recharged or observed. A well or wellpoint is similar to a borehole, but normally larger in diameter and often only a few metres deep. They are used for the extraction of shallow groundwater, sometimes located in rivers/streams extracting the shallow groundwater from the river bed. borehole well dug well CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.320885 18.76327 -34.24852 -33.72717 text/html springs Springs are points or areas were groundwater exits the subsurface environment, either as a result of gravity or pressure. They can be perennial or ephemeral and can yield either small or large volumes of water. Famous springs in South Africa include Malones Eye and the Uitenhage Spring. spring fountain eye groundwater CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.35189 18.48402 -34.2065 -33.933595 text/html meteorological_stations Weather (or meteorological) stations can record various parameters with often sophisticated and specialised equipment. These include rainfall, evaporation, wind speed and direction, humidity, temperature and others. rainfall evaporation monitoring observation CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.3192 18.6 -34.16673 -33.9206 text/html gw_chemistry CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.320884 18.751589 -34.248521 -33.727169 ec Electrical conductivity (EC) expressed in milli-Siemens per metre is a measure of how well a material accommodates the transport of electric charge. The more salts dissolved in the water, the higher the EC value. It is used to estimate the amount of total dissolved salts, or the total amount of dissolved ions in the water. The SANS 241: 2015 limit for health risk concentration is 170 mS/m. The standard defines health risks (parameters falling outside these limits may cause acute or chronic health problems in individuals), aesthetic risks (parameters falling outside these limits indicate that water is visually, aromatically or palatably unacceptable and operational risks (parameters falling outside these limits may indicate that operational procedures to ensure water quality standards are met may have failed). The SA Domestic Water Quality Guide specifies the following limits (classes): Class 0: 0 - 70 Class 1: 70 - 150 Class 2: 150 - 370 Class 3: 370 - 520 Class 4: > 520 ec electrical conductivity water quality CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.320885 18.751589 -34.24852 -33.72717 text/html iron Although a low level of iron cannot do much harm, iron in water is considered as a contaminant because it also contains bacteria that feed off it. In addition to this, high iron content leads to an overload which can cause diabetes, hemochromatosis, stomach problems, nausea, and vomiting. The SANS 241: 2015 limit for health risk concentration is 2 mg/l The SA Domestic Water Quality Guide specifies the following limits: Class 0: 0 - 0.5 Class 1: 0.5 - 1 Class 2: 1 - 5 Class 3: 5 - 10 Class 4: > 10 iron water quality WHO CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.320885 18.751589 -34.24852 -33.72717 text/html bh_properties CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.224872 20.592878 -34.563669 -32.056991 borehole_depth Borehole depths give an indication on how deep one has to drill to make the borehole deep enough so that a reasonable amount of groundwater can flow into the borehole and the groundwater level is high enough above the borehole bottom to allow "sufficient" water abstraction. borehole groundwater CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.320885 18.76327 -34.2363 -33.73273 text/html borehole_yield Borehole yield definition: The amount of water obtained from a borehole, aquifer or water resource within a specified time. The volume of water per unit of time blown from the borehole during drilling. The blow yield is the rate at which water is blown from a borehole during drilling. A blow yield test is usually conducted once the borehole is completed to provide an indication of borehole yield. This "theoretical" yield may or may not be a sustainable pumping rate for longer periods of time, which needs to be determined with a range op pumping (aquifer) tests. borehole groundwater blow yield CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.3192 18.77021 -34.24852 -33.72717 text/html depth_to_wl The depth to the water level gives an indication of how deep a borehole/well would have to be to reach the top of the groundwater. From that level to the bottom of the hole (or the pump inlet) would then be the available drawdown. groundwater water level CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.320885 18.76327 -34.24852 -33.72717 borehole_prospects The borehole prospects, or chances of a successful borehole (BH), is a measure of the ease or difficulty with which groundwater will be struck during drilling of a borehole. This is a statistical analysis of historical boreholes drilled in an area. A successful borehole is defined as a borehole with a yield of at least 0.1l/s (may just be enough for garden watering), while a borehole with > 2l/s is regarded as a "strong" borehole. borehole prospects drilling groundwater CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.224872 20.592878 -34.563669 -32.056991 text/html hydrology CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.33258 32.880969 -34.751947 -22.188031 dams_lakes Dams are man-made water storage reservoirs that can be used to store water or restrict river flow. Lakes are natural water storage areas filled with water, localized in a basin, that are surrounded by land, apart from any river or other outlet that serves to feed or drain the lake. dam lake man-made CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.33258 32.880969 -34.751947 -22.188031 text/html rivers_and_streams The status of the official Open Watercourse layer is representative of natural and built river systems, which integrates surface stormwater runoff into underground urban drainage reticulation, from upstream mountain intakes to coastal outfalls. This is a subset of the Official Watercource layer of the City of Cape Town. Open Watercourse river reaches are comprised of feature types such as Natural Rivers, Streams, Channels, Canals, Overland Flow Paths/Gap Connectors and Stream Extensions.The spatial coverage of Open Watercourses of the greater Cape Town Drainage Catchment area includes all rivers within the catchments, which drain into but also extend outside the Cape Town metro area. rivers streams watercource CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.333169 18.972176 -34.23902 -33.49773 more_basemaps CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.448201 32.901803 -34.8518 -22.098201 imagery_50cm The latest 50cm resolution imagery of the Chief Directorate: National Geo-spatial Information. imagery NGI CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.448201 32.901803 -34.8518 -22.098201 Overview CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.451909 32.944981 -34.834171 -22.125029 roads_for_overview Major roads excluding some residential roads, tracks, cycleways and service roads roads highway arterial primary secondary tertiary CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 17.834276 24.359352 -34.832609 -30.532402 text/html cape_town_wsas_overview Cape Town Table Mountain Cape Flats Water Source Area CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.307212 18.677182 -34.227602 -33.824543 provinces CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.451909 32.94498 -34.834171 -22.12503