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| Created: | Feb 07, 2023 at 6:06 p.m. | |
| Last updated: | Feb 07, 2023 at 6:07 p.m. | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
The Atlantis Water Supply Scheme (AWSS, Western Cape, South Africa) has been in operation for about 40 years as a means to supply and augment drinking water to the town of Atlantis via managed aquifer recharge (MAR). In this study, the numerical model MODFLOW for groundwater flow and contaminant transport was used in support of the management of the AWSS. The aims were: (i) to calibrate the MODFLOW model for the MAR site at Atlantis; (ii) to run realistic scenarios that cannot be replicated through experiments; and (iii) to make recommendations in support of efficient and sustainable management of the aquifer. MODFLOW was calibrated through comparison of observed and simulated groundwater levels (R-2 between 0.663 and 0.995). Scenario simulations indicated possible drawdowns between < 5 m (low groundwater abstraction and low artificial recharge of groundwater through infiltration basins) and > 20 m (high abstraction and high artificial recharge) at localized areas of the Witzand wellfield. At Silwerstroom, large drawdown levels were not predicted to occur, so this wellfield could be exploited more without affecting the sustainability of the groundwater resource. Groundwater moves from the infiltration basins towards the Witzand wellfield at a rate of 120-150 m.a(-1). The modelling results supported recommendations for balancing groundwater abstraction and artificial recharge volumes, monitoring the water balance components of the system, the potential risks of groundwater contamination and the delineation of groundwater protection zones.
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Additional Metadata
| Name | Value |
|---|---|
| DOI | 10.4314/wsa.v43i1.15 |
| Depth | 50 |
| Scale | < 100 km² |
| Layers | 1 layer |
| Purpose | groundwater resources |
| GroMoPo_ID | 61 |
| IsVerified | True |
| Model Code | MODFLOW |
| Model Link | https://doi.org/10.4314/wsa.v43i1.15 |
| Model Time | 1993-2011 |
| Model Year | 2017 |
| Model Authors | Nebo Jovanovic, Richard DH Bugan, Gideon Tredoux, Sumaya Israel, Rodney Bishop, Vernon Marinus |
| Model Country | South Africa |
| Data Available | report/paper only |
| Developer Email | njovanovic@csir.co.za |
| Dominant Geology | siliciclastic sedimentary (sandstones, shales) |
| Developer Country | South Africa |
| Publication Title | Hydrogeological modelling of the Atlantis aquifer for management support to the Atlantis Water Supply Scheme |
| Original Developer | No |
| Additional Information | |
| Integration or Coupling | None of the above |
| Evaluation or Calibration | dynamic water levels |
| Geologic Data Availability |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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