The Modder Riet Catchment Management Forum

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Imogen Gilmore
6 years ago
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1 The Modder Riet Catchment Management Forum Johan van der Merwe Chair: MR CMF (Bloem Water)

2 Challenges in water sector Diversity of resources-augmentation Water conservation and demand management Disability of municipalities Pollution 1. WWTW s 2. Mines Non implementation of the National Water Act

3 Functions of Forums Institution to facilitate participation of stake- holders Enable public to participate in WRM Ongoing role of Catchment Forums after CMA After CMA Promote planning and cooperative WRM Public participation body of the CMA

4 DETERMINATION OF RESOURCE WATER QUALITY OBJECTIVES FOR THE MODDER-RIET SYSTEM

5 RWQO: Balance between downstream User requirement and upstream impacts (uses)

RWQOs DETERMINATION PROCESS Geographical Extent

Programs (location) WQ Status & Trends Delineation &

Parameters & Catchment specific WQGs Levels of Protection

6 RWQOs DETERMINATION PROCESS Geographical Extent Anthropogenic Characteristics & Ecology WQ Monitoring Programs (location) WQ Status & Trends Delineation & Confirmation of Management Units ID of RWQO Sites Parameters & Catchment specific WQGs Levels of Protection & RWQOs Evaluation & Finalization of RWQOs { { { SA WQGs U T A I RWQOs X mg/l Y mg/l Z mg/l

7 Catchment Overview

8 Natural Shrub-land Irrigated Land Land-Use Dry-land Agriculture Largest Urban Area Natural Grassland Land use in the Area is dominated by Natural Areas, Farmlands (dryland and irrigated) and Urban Areas. Mining also occurs but is not extensive

Proposed Management Units Recommendation:

will influence MU) Site Visits: Kalkfontein

MU6 MU1 MU4 Recommendation: Split MU6 MU5

are the same as those proposed in the CMS.

9 Proposed Management Units Recommendation: Check influence of Vaal (pushback into Riet will influence MU) Site Visits: Kalkfontein WUA Oranje Riet WUA MU3 Oranje Vaal WUA MU2 MU6 MU1 MU4 Recommendation: Split MU6 MU5 Water Resource MU s for the Modder-Riet System are the same as those proposed in the CMS. Motivations for the selection of each MU is contained in the CMS.

10 RWQO sites are identified such that it allows the Water Resource Manager to- exercise control over the quality of water that enters a MU: must be supplied to downstream users exercise control over the quality of water leaving a MU. Identification of RWQO sites

Proposed RWQOs sites Lower Modder River receives water from the Orange River via the OR Canal: Recommendation to ensure that Modder and O-R water is distinguished between New Point Lower Riet River

11 Proposed RWQOs sites Lower Modder River receives water from the Orange River via the OR Canal: Recommendation to ensure that Modder and O-R water is distinguished between New Point Lower Riet River does not receive water from Kalkfontein Dam. Instead it is transported via a canal to users. Recommendation to take into cognizance the operation of the scheme when setting sites for RWQO s Red Points (11 Sites) were selected as RWQO Sites Green Points (3 Sites) required further investigation.

12 General Impacts Nutrient-loading Salt-loading Microbial pollution Sedimentation

13 Parameters of Concern Ammonia Phosphate Sulphate Chloride EC TDS F. & E. Coli SAR Sodium

Water Users Per MU MU3:Lower Modder U6: Lower Riet Domestic, Agriculture (Irrigation), Agriculture (Stock Watering) Ecology,& Industry (Category 4) Agriculture (Irrigation) Agriculture (Stock

14 Water Users Per MU MU3:Lower Modder U6: Lower Riet Domestic, Agriculture (Irrigation), Agriculture (Stock Watering) Ecology,& Industry (Category 4) Agriculture (Irrigation) Agriculture (Stock Watering), Ecology & Recreation (Non contact). MU2:Middle Modder Domestic, Agriculture (Irrigation), Agriculture (Stock Watering) Ecology,& Recreation (Non-contact, Intermediate-Contact, Full Contact). MU1:Upper Modder Domestic, Agriculture (Stock Watering), Ecology, & Recreation (Noncontact, IntermediateContact, Full Contact) MU6: Lower Riet Domestic, Agriculture (Irrigation), Agriculture (Stock Watering) Ecology,& Industry (Category 4) MU5: Middle Riet Domestic, Agriculture (Irrigation), Agriculture (Stock Watering) Ecology,& Recreation (Non-contact, Intermediate-Contact). MU4: Upper Riet Domestic, Agriculture (Irrigation), Agriculture (Stock Watering) Ecology,& Recreation (Non-contact, Intermediate-Contact, Full Contact).

15 Catchment Specific WQ Guidelines MU 2: MIDDLE MODDER Users: Domestic, Ecology, Recreation (Non-contact, Intermediate-Contact, Full Contact), Agriculture (Irrigation), Agriculture (Livestock Watering) VARIABLE UNITS I A T Sensitive User Ammonia (NH3-N) mg/l AqE Chloride (Cl) mg/l Dom, AIr Sodium (Na) mg/l AIr SAR mg/l AIr EC ms/m AqE TDS mg/l AIr Phosphate (PO4-P) mg/l AqE Sulphate (SO4) mg/l Dom F. Coli #/100ml RFc E. Coli #/100ml

16 Proposed Levels of Protection MU3 MU2 Tolerable? Tollerable? MU7 Tolerable? MU6 MU1 Tolerable? MU4 MU5 Acceptable? NOTE: Results from Reserve Acceptable? Ideal?

17 RHP Sites

18 Existing RWQO s Vaal IWQMS: Riet Level 2 RWQO Orange IWQMP: LEVEL 1 RWQO ORS8 Catchment wide RWQO s (MR CMS) i.e one set of WQ objectives for whole catchment

19 Implementation of RWQO S Receiving water quality objectives promulgation WULA Quality conditions Pollution pay principle Compliance

20 THE WAY FORWARD Sanction of RWQO s by MR CMF Finalisation of Report Implementation Further refinement

21 Thank You!

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