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 website. ]]> infoMapAccessService groundwater database water source areas table mountain Cape Town Klaudia Schachtschneider (WWF South Africa) Table Mountain Water Source Partnership pointOfContact +27 21 657 6600 KSchacht@wwf.org.za no conditions apply 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 website. ]]> infoMapAccessService groundwater database water source areas table mountain Cape Town CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.160397 18.711631 -34.225525 -33.853379 grid Grid lines at 0.25 degree distances: The Northing (horizontal ines) is actually "Southing" as the line is south of the equator. The vertical lines (Eastings) are east of Greenwich (0°). CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 17.75 20.25 -34.5 -32.5 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 quaterneray catchments, which were created by evaluating a digital elevation model (therefore the jagged lines from the cell size of the DEM), and which may not coincide 100% with the "official" quaternary catchment boundaries. For more information on the Table Mountain Water Source Area please visit the dashboard at https://water.cer.org.za/areas/table-mountain. For general information on how the water source areas are defined read the Documentation 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 mon_boreholes Monitoring boreholes and wells of the Table Mountain Water Source Area network. 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 groundwater wellpoint dug well well 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 (NGA) 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_sites Other monitoring boreholes in and around the Table Mountain Water Source area, which are monitored on a regular basis, either with hand measurements or electronic data loggers. Some of these have already 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 pie charts represent monthly averages [mm] in different colours, starting with January at the top through to December in anti-clockwise direction. The size of the pie 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 and rainfall stations. These areas have been selected to contain monitoring stations, which are representative of the conditons in that area. Three clusters have been identified and these may be used to view statistics for monitoring station data like water levels, water quality 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 boreholes Includes a well, excavation, or any other artificially constructed or improved underground cavity which can be used for the purpose of intercepting, collecting or storing water in or removing water from an aquifer; observing and collecting data and information on water in an aquifer; or recharging an aquifer. [Source: National Water Act (Act No. 36 of 1998)]. A borehole is a constructed hole in the ground from which groundwater can be abstracted, recharged or observed. A 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. A wellpoint or drive point is a pipe with wall openings large enough to allow water to enter and small enough to keep water-bearing formation in place. A dug well is a shallow large diameter man-made pit or hole, from which groundwater can be abstracted. A dug well is mostly constructed in soft geological formations such as alluvium adjacent to rivers. The pit is normally dug by hand or using an excavator and generally has a diameter larger than 0.5 m. borehole groundwater wellpoint dug well CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.320885 18.76327 -34.24852 -33.72717 text/html springs Definition: A point where subsurface water emerges at surface, usually as a result of topographical, lithological or structural controls. Description: 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 seepage_ponds Seepage ponds are typically small water reservoirs into which seepage for shallow sub-surface water infiltrates. These can be used for water extraction to dewater building basements , but they may also be ponds filled with water from mining or other industrial activities and are then used for evaporation. seepage monitoring observation CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.420779 18.58318 -34.07075 -33.915586 meteorological_stations Meteorological or weather 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 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 SA Domestic Water Quality Guide specifies the following limits: 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 18.319199 18.770211 -34.248521 -33.727169 borehole_depth A borehole is a constructed hole in the ground from which groundwater can be abstracted, recharged or observed. Includes a well, excavation, or any other artificially constructed or improved underground cavity which can be used for the purpose of intercepting, collecting or storing water in or removing water from an aquifer; observing and collecting data and information on water in an aquifer; or recharging an aquifer. [Source: National Water Act (Act No. 36 of 1998)]. borehole groundwater CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.32571 18.76327 -34.2363 -33.73273 text/html borehole_yield Definition: The amount of water 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. borehole groundwater CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.3192 18.77021 -34.24852 -33.72717 text/html admin_infrastructure CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 17.834275 32.124814 -34.832609 -23.021781 roads 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 official_suburbs You may have to zoom in to see this layer. The Development Management Department maintains the City’s suburb dataset. Suburbs are basically residential regions within the City of Cape Town, determined by the City with the intention of administering areas more efficiently. Therefore the City changes suburb boundaries or incorporate new Suburb areas at times for various reasons, mainly when new developments take place. An example would be the new suburb of Clara Anna Fontein which is a direct result of the new development. Suburbs form the last part of the Official Situational Address for each property. City of Cape Town suburbs planning CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.307449 19.004668 -34.359044 -33.471273 0 100000 text/html towns The major towns and cities of the Western Cape towns cities CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 17.920965 32.124814 -34.191632 -23.021781 hydrology CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 17.630931 32.880969 -34.834659 -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_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. CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 18.333169 18.972176 -34.23902 -33.49773 sec_q4_catchments Secondary quaternery catchments interpolated from Digital Elevation Model (DEM) CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 17.631363 24.288943 -34.834659 -30.295878 catchments Catchment in relation to watercourse or watercourses or part of a watercourse, means the area from which any rainfall will drain into the watercourses or part of a watercourse through surface flow to a common point or points. [Source: National Water Act (Act No. 36 of 1998)] Synonyms: Drainage Basin, Watershed Description: The area from which water - which could include both surface and subsurface water - drains towards a common point. The surface and subsurface catchment areas may not coincide. The extent of catchment areas is defined by hydrological divides. This is a term essentially used by surface hydrologists. catchment river watershed drainage basin CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 17.630931 24.520379 -34.834 -30.296415 text/html hydrogeology CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.458021 32.895974 -34.839829 -22.12268 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 18.751589 -34.24852 -33.72717 faults In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movement. Faults are preferred pathways for groundwater movement and, depending on width, weathering, composition and other factors, are detectable and traceable with geophysical equipment for siting boreholes. geology fault tectonics CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.545154 32.279309 -34.716378 -22.138576 lithology The lithology of a rock unit is a description of its physical characteristics visible at outcrop, in hand or core samples, or with low magnification microscopy. Physical characteristics include colour, texture, grain size, and composition. See also https://en.wikipedia.org/wiki/Lithology in Wikipedia for more explanations. chronostratigraphy lithology geology borehole log CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.458894 32.8918 -34.832352 -22.12268 application/pdf gw_occurrence Groundwater occurs in aquifers. Aquifers are geological formations which have structures or textures that hold water or permit appreciable water movement through them. [Source: National Water Act (Act No. 36 of 1998)]. A formation, group of formations, or part of a formation that contains sufficient saturated permeable material to store and transmit water; and to yield economical quantities of water to boreholes or springs. A fractured aquifer is defined as a formation that contains sufficient fissures, fractures, cracks, joints and faults that yields economic quantities of water to boreholes and springs. Intergranular aquifers are aquifers in which groundwater flows in openings and void space between grains or weathered rock. aquifer groundwater fractured intergranular CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.458894 32.891663 -34.832352 -22.12268 text/html harvest_potential The Groundwater Harvest Potential Map was the first attempt to provide quantitative information on sustainable rates of groundwater abstraction in South Africa on a country-wide basis. Harvest Potential gives the maximum rate at which groundwater can be sustainably abstracted. Local socio-economic or environmental factors could reduce this considerably. This map is intended to provide a national overview and perspective on sustainable abstraction. It cannot be used for local planning, development or management of groundwater. Such exercises require local investigations and assessments. groundwater harvest potential CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.458047 32.895797 -34.839726 -22.126401 text/html borehole_prospects Borehole prospects 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 a borehole with a yield of at least 0.1l/s, while a borehole with > 2l/s is regarded as a "strong" borehole. borehole prospects drilling groundwater CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.458021 32.895974 -34.839829 -22.126611 more_basemaps CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 15.999999 33.000156 -35.000075 -21.999999 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 topo_250k The latest 1:250000 scale topographic maps of the Chief Directorate: National Geo-spatial Information. CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16 33.000156 -35.000075 -22 0 500000 topo_50k The latest 1:50000 scale topographic maps of the Chief Directorate: National Geo-spatial Information. CRS:84 EPSG:4326 EPSG:32734 EPSG:3857 16.25 32.999972 -34.849985 -21.999999 0 100000 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