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A Groundwater Planning Toolkit for the Main Karoo Basin
Expanded Title:The project aimed to identify favourable groundwater potential areas for bulk municipal water supplies, to provide a method to quantify them, and to provide the information in a manner so that it is accessable for planning purposes. In identifying favourable groundwater areas, the focus turned to developing a detailed transmissivity map of the Main Karoo Basin. In order to present groundwater yields in an accessible manner to water supply planners. Two methods were developed, namely the Aquifer Assured Yield Model and the Aquifer Firm Yield Model. The Aquifer Firm Yield Model provides the historic firm yield and uses historic monthly rainfall data together with recharge, evapotranspiration and baseflow to determine aquifer storage in any given month. The firm yield can be considered to define the upper limit of the groundwater resource. In order to establish possible wellfield yields, the Cooper-Jacob Wellfield Model (based on the Cooper-Jacob approximation of the Theis groundwater flow equation) was developed whereby borehole spacing can be optimised after inputting estimated transmissivity values from the transmissivity map. To aid the planning process, groundwater quality maps were produced together with the Wellfield Cost Model which provides an easy way to obtain first-order cost estimates of the wellfield options.
Date Published:01/05/2012
Document Type:Research Report
Document Subjects:Sanitation - Waterborne sanitation
Document Keywords:Ground Water
Document Format:Report
Document File Type:pdf
Research Report Type:Standard
WRC Report No:1763/1/12
ISBN No:978-1-4312-0215-7
Authors:Murray R; Baker K; Ravenscroft P; Musekiwa C; Dennis R
Project No:K5/1763
Document Size:20 386 KB
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