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EXISITNG OPERATING RULES OF MAJOR DAMS BUILT INTO WATER RESOURCES YIELD MODEL FOR THE LETABA RIVER SYSTEM 31 October 2013 INFORMATION WORK SESSION Presented.

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Presentation on theme: "EXISITNG OPERATING RULES OF MAJOR DAMS BUILT INTO WATER RESOURCES YIELD MODEL FOR THE LETABA RIVER SYSTEM 31 October 2013 INFORMATION WORK SESSION Presented."— Presentation transcript:

1 EXISITNG OPERATING RULES OF MAJOR DAMS BUILT INTO WATER RESOURCES YIELD MODEL FOR THE LETABA RIVER SYSTEM 31 October 2013 INFORMATION WORK SESSION Presented by: Pieter van Rooyen

2 Major Dams focussed on Dap Naude Ebenezer Magoebaskloof & Vergelegin Hans Merensky Tzaneen Thabina Middel Letaba Nsami Modjaji

3 Location of Dams on Map

4

5 Location of Dams on schematic diagram: Upper Letaba 1 Dap Naude Ebenezer Georges Valley Canal Pusela Canal

6 Location of Dams on schematic diagram: Upper Letaba 2 Magoebaskloof Vergelegin Hans Merensky Tzaneen Thabina Noord Canal NN Canal

7 Location of Dams on schematic diagram: Middle Letaba Middel Letaba Nsami Canal

8 Location of Dams on schematic diagram: Lower Groot Letaba Modjaji

9 DAP NAUDE Current court order: 0.028 m 3 /s released from November to June, with the full inflow to the dam being released in August, September & October Present day simulated 0.028 m 3 /s all year round No support to Ebenezer Current abstraction: Polokwane: 4.07 mill m 3 /a (gauge: B8R006) Present Day simulated Court order

10 EBENEZER Rule: no support to Tzaneen BUT reality shows different 2 release events from Ebenezer when Tzaneen Dam low

11 EBENEZER To simulate closer to observed, built in rule to support Tzaneen when Tzaneen drops below 15% TzaneenEbenezer With support to Tzaneen No support to Tzaneen TzaneenEbenezer

12 EBENEZER DEMANDS & RESTRICTIONS Directly from dam: Polokwane: 16.2 million m 3 /a (Gauge B8R001) Irrigation: Releases for Georges Valley Canal: 2.54 million m 3 /a Releases for Pusela Canal: 7.00 million m 3 /a Releases for Main stem: 1.85 million m 3 /a Total: 11.4 million m 3 /a Irrigators restricted based on Tzaneen Dam operating rule and levels AND 0 allocation when Ebenezer < 20% Urban 70% allocation when Ebenezer < 20%

13 MAGOEBASKLOOF & VERGELEGIN Measured canal outflow from Magoebaskloof, 4.6 million m 3 /a (gauge: B8R003) Irrigation for tea plantation greatly reduced from allocation for present day run Abstraction from Vergelegin for Industry and town = 2.16 million m 3 /a, given priority MagoebaskloofVergelegin

14 HANS MERENSKY No support to Tzaneen Only irrigation demand from dam, 4.5 million m 3 /a

15 TZANEEN DEMANDS AND RULE Rule: below 95% irrigators cut to 50% allocation, reviewed incrementally as dam recovers above 95% Below 15% irrigators get 0%, urban cut to 70% Irrigation: Noord Kanaal: 28.8 million m 3 /a N&N Kanaal: 13.03 million m 3 /a Main River Tzaneen: 27.85 million m 3 /a Total: 69.68 million m 3 /a 0.6 m 3 /s must pass Letaba Ranch, released from Tzaneen when incremental insufficient Urban demands: Tzaneen town, Ritivi 1 & 2, Ba Phalaborwa: 12.4 million m 3 /a

16 Tzaneen Dam simulated With restriction rule No restriction rule

17 MIDDEL LETABA Releases through canal to Nsami Dam as per measurements (gauge B8R007) 18.3 million m 3 /a Abstraction and losses from canal calculated from measurements (gauge B8R007 - B8H067): 16.8 million m 3 /a Urban abstraction from dam: 2.7 million m 3 /a

18 NSAMI Urban abstraction from dam: 2.8 million m 3 /a

19 MODJADJI Urban abstraction from dam: 2.9 million m 3 /a

20 THABINA Urban abstraction from dam: 2.8 million m 3 /a

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