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University of KwaZulu-Natal (2022)

Investigating potential aquifers for managed aquifer recharge using treated wastewater around the greater Ethekwini District Municipality

Msweli, Hlengiwe Fortunate

Titre : Investigating potential aquifers for managed aquifer recharge using treated wastewater around the greater Ethekwini District Municipality.

Auteur : Msweli, Hlengiwe Fortunate.

Université de soutenance : University of KwaZulu-Natal

Grade : Master of Science (MS) In Hydrogeology 2022

Résumé partiel
Managed Aquifer Recharge (MAR) can be used as one of the climate variability and change adaptation strategies so as to alleviate problems related to water security such as water quality deterioration, groundwater level decline and impacts on groundwater-dependent ecosystems. This study investigated potential aquifers within the eThekwini District Municipality that have the capacity to store treated wastewater in the form of MAR. The main objectives of this MAR study was to assist in climate change adaptation and the mitigation of potential seawater intrusion. The study employed geological, hydrogeological, and hydrochemical data analyses and interpretation. Additionally, the study examined the amount and quality of treated wastewater generated within the area for use for use as recharge source of MAR.

The geological and hydrogeological data analyses show that three different aquifers occur in the study area, namely ; 1) Weathered and fractured aquifers composed of the Pietermaritzburg Formation and rocks of the Natal Metamorphic Province, where the former is characterised by average borehole yield, hydraulic conductivity (K) and transmissivity (T) of 1.2 l/s, 0.56 m/day and 0.28 m2 /day, respectively. While the latter is characterised by mean borehole yield, K and T values of 0.02 l/s, 0.56 m/day and 3.9 m2 /day, respectively ; 2) Fractured aquifers made up of the Natal Group sandstone and the Dwyka Group diamictite. The Natal Group sandstone is characterised by average borehole yields, K and T values of 9.1 l/s, 2.87 m/day and 8.32 m2 /day respectively, and the Dwyka Group is characterised by average borehole yields of 0.4 l/s, K value of 0.8 m/day and T value of 1.3 m2 /day ; and 3) Intergranular or primary aquifers of the Maputaland Group which consists of the Bluff and Berea Formations and recent alluvium and estuarine deposits. The Bluff Formation is characterised by mean borehole yield, K and T values of 13.05 l/s, 3.2 m/day and 9.6 m2 /day, respectively. The Berea Formation is characterised by average borehole yield, K and T values of 25 l/s, 5 m/day and 7 m2 /day, respectively. The recent alluvium and estuarine deposits have average borehole yields of 24 l/s, K value of 6.5 m/day and T value of up to 32 m2 /day.

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Page publiée le 3 janvier 2023