- Title
- Appraising the sustainability of groud water quantity and quality
- Creator
- Mkosana, Kululwa
- Description
- South Africa is a semi-arid region that suffers from water scarcity. With a changing climate, incidents such as droughts and human migration will exacerbate the water scarcity already experienced. Thus, the assessment of groundwater quality and quantity is a major step toward ensuring a viable sustainable water argumentation for general use and to serve as one of the most basic needs of human beings. Hence, this study appraises the sustainability of groundwater resource availability and assesses its water quality at the King Sabatha Dalindyebo Local Municipality within the Mthatha River Catchment (MRC). The objectives were to: i) examine the extent of groundwater potential in the area ii) investigate the determinant factors that characterized the groundwater and surface water interaction and assess the impacts of climatic variables on yield iii) compare the physico-chemical and microbial concentration samples collected at different boreholes in the MRC with respect to South African and World Health Organization (WHO) standards and iv) develop the temporal variation trend in modeling the groundwater quality parameters. Using a systematic sampling method, a preliminary survey was carried out to identify the location and selection of the appropriate boreholes’ representation. Thereafter, reconnaissance map and characterisation of the 10 selected borehole's location was made to spatially represent the sites. The water samples were made thrice per site (totally 30 samples). The collected samples were transported to Talbot and Talbot Laboratory, where they were analysed for their physico-chemical and bacteriological parameters using established procedures. Other parameters such as depth of hole, water level, borehole yield, abstraction rate, the screen length, drawdown, morphometry, geological, land-use variables, were generated after rigorous geographical information system (GIS) analysis in QGIS environment and Excel in achieving the study aims. The Soil and Water Assessment Tool (SWAT) model was used for the estimation of the groundwater flow or baseflow drawing strength from the hydraulic conductivity of the aquifer flow (Ksat) (mm/day), sub-basin divide for the groundwater system to the main channel Lgw (m), and the water table height (m). Thereafter, the principal iv component analysis, multiple linear regression analysis, and correlation analysis were used to assess the controlling factors for the spatial variation of recharge in the watershed characteristics and assess the impacts of climatic variables on groundwater yield. The simulated results revealed a mean monthly water yield range of 2.7-14.8 m3/s for groundwater over the study years (2000-2019). The development of temporal variation trend modeling of the physico-chemical composition of the groundwater varied from one borehole to another despite their proximity, thus, making it difficult to generalise the water quality parameters fluctuation. The water quality results showed that the majority of the variables are not within acceptable standards. Ammonia and total coliform levels depict a range between 1.5 mg/l minimum to 10 mg/l maximum with to 1000 counts/mL for total coliform. Also, there was no clear relationship between the location of the boreholes and the borehole yield among the selected samples. However, there was a significant difference between the borehole yield and the risk description matrix for the various water quality parameters. Most of the borehole water quality depicts a non-health aesthetic, acute health, and disinfectant status for the area. Keywords: Water scarcity, groundwater, seasonal variability, aquifer scale
- Description
- Thesis (Masters) -- Faculty of Natural Sciences, 2023
- Date
- 2023-00
- Subject
- Geography
- Type
- Masters theses, text
- Identifier
- http://hdl.handle.net/11260/9398
- Identifier
- vital:73516
- Format
- computer, online resource, application/pdf, 1 online resource (111 pages), pdf
- Publisher
- Walter Sisulu University, Faculty of Natural Sciences
- Language
- English
- Rights
- Walter Sisulu University, All Rights Reserved, Open Access
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| Thumbnail | File | Description | Size | Format | |||
|---|---|---|---|---|---|---|---|
| View Details | SOURCE1 | Kululwa Mkosana.pdf | 2 MB | Adobe Acrobat PDF | View Details |