To achieve this scenario into the High infrastructure costs to implement REC therefore future, the groundwater status increases compared to PES in four water requirements for the (of six) quaternary catchments. ESBC used. These four catchments include all Swart river node is in an those of the Overberg West Overberg West unacceptable condition, and H16 II Coastal, plus G40C of the Overberg Coastal Onrus river node is improved West IUA. The increase in from baseline but is still in a groundwater stress in these four poor condition (i.e. C to below catchments is moderate, with each D Ecological Category). catchment increasing its status by Buffels and Rooiels are in a one equivalent category (i.e. good condition. increases from category I to II or II The nodes at the bottom of the to III). catchment should be One of the quaternary catchments Overberg West II maintained in a good condition B5a impacted by a change in category (i.e. B to C Ecological (G40H) has been identified as Category). having a high GWBF/EWR ratio, Although there are regions indicating groundwater contribution within the Overberg West IUA to baseflow has the potential to that are of conservation sustain the EWR. Abstraction B5b Overberg West III importance, the surrounding would need to be carefully land use in most cases has led managed to ensure impacts on to degraded systems. GWBF do not impact on the flow required for the associated EC. To achieve this scenario, the Overberg East Hartbees and Steenbok are in F10 II Renosterveld groundwater status increases a poor condition. compared to PES in one quaternary High infrastructure costs to catchment (G40L, located in implement REC therefore Overberg East Fynbos IUA). The water requirements for the increase in groundwater stress in ESBC used. this catchment is fairly significant, Limited change from baseline with the catchment increasing its Overberg East condition. Conditions of river H17 III use/ recharge ratio from (‘stress’) Fynbos nodes are fair to poor. 19 to 88%. De Hoop Vlei and The quaternary catchment Klipdrifsfontein are maintained impacted by a change in category in a good condition. has not been identified as having a high GWBF/EWR ratio.
H16 Overberg West Coastal II High infrastructure costs to implement REC therefore water requirements for the ESBC used. Swart river node is in an unacceptable condition, and Onrus river node is improved from baseline but is still in a poor condition (i.e. C to below D Ecological Category). Buffels and Rooiels are in a good condition. To achieve this scenario into the future, the groundwater status increases compared to PES in four (of six) quaternary catchments. These four catchments include all those of the Overberg West Coastal, plus G40C of the Overberg West IUA. The increase in groundwater stress in these four catchments is moderate, with each catchment increasing its status by one equivalent category (i.e. increases from category I to II or II to III). One of the quaternary catchments impacted by a change in category (G40H) has been identified as having a high GWBF/EWR ratio, indicating groundwater contribution to baseflow has the potential to sustain the EWR. Abstraction would need to be carefully managed to ensure impacts on GWBF do not impact on the flow required for the associated EC. B5a Overberg West II The nodes at the bottom of the catchment should be maintained in a good condition (i.e. B to C Ecological Category). B5b Overberg West III Although there are regions within the Overberg West IUA that are of conservation importance, the surrounding land use in most cases has led to degraded systems. F10 Overberg East Renosterveld II Hartbees and Steenbok are in a poor condition. To achieve this scenario, the groundwater status increases compared to PES in one quaternary catchment (G40L, located in Overberg East Fynbos IUA). The increase in groundwater stress in this catchment is fairly significant, with the catchment increasing its use/ recharge ratio (‘stress’) from 19 to 88%. The quaternary catchment impacted by a change in category has not been identified as having a high GWBF/EWR ratio. H17 Overberg East Fynbos III High infrastructure costs to implement REC therefore water requirements for the ESBC used. Limited change from baseline condition. Conditions of river nodes are fair to poor. De Hoop Vlei and Klipdrifsfontein are maintained in a good condition.
Evaluation%20of%20Scenarios%20Report%20(Draft)%20%20(Dec).docx