COORDINATES (degrees, minutes,seconds) Dam andreleased V tothe Dam atarate of174m wouldbeexperienced lossesthat of the from V the From: The Orange–Senqu River BasinInfrastructure Catalogue,ORASECOM Report 001/2013 T Purpose nettransferscheme involvingthe m ofupto630million The dam has an earthfill wall. It receives its water viathe Thukela–Vaal Transfer Scheme, which is a pumped-storage Description uppercatchmentarea NuwejaarsSpruit,inthe Africa.Itislocatedonthe in South V ofthe T Location from DriekloofDamatarate of312 m waterisreleased and earlyevening,the morning duringthe demand. Duringperiodsofpeakdemand,typically dead storage levelof1,646 m.The reservoir ofthe bottom isat1,617 m. a and 1,702 m of level supply full a has area.Thedam surface reservoir, relativelysmall a with deep, is it since needed. Due to the favourable storage and climatic characteristics of , it is beneficial to store deep,water inthe cool SterkfonteinDamandonlyreleaseV shallow watertothe to beneficial is it Dam, Sterkfontein of characteristics climatic and storage favourable the to Due needed. evaporation lossesfrom Sterkfontein Damare approximately m 35million he water from K upperreacheshis damissituatedinthe V ofthe 28° 23’14”S LATITUDE S terkfontein Dam waZ L 29° 01’00”E ONGITUDE ulu-Natal is stored in 3 /s by four 250 MW pumps/turbines into Driekloof Dam during periods of low power low of periods during Dam Driekloof into pumps/turbines 250 MW four by /s aal Dam via the WilgeRiverwhenneeded.T aal Damviathe 3 /s togenerate upto1,000MWofpower. Sterkfontein Dam and released to V aal River, catchmentC11L upstream inquaternary ofStanderton aal Damforasimilarvolume.Water ispumpedupfrom Kilburn 3 ofwaterfrom K waZ 3 /a whichrepresents approximately 10% terkfontein Dam is a very effectivehe SterkfonteinDamisavery ulu-Natal. T aal Dam via the when aal Damwhenneeded.T his isstored inSterkfontein aal River. he Water Affairs) Sterkfontein Damunderconstruction. (Source: SADeptof NAMIBIA Orange-Senqu SOUTH AFRICA River Basin BOTSWANA Sterkfontein Dam LESOTHO Sterkfontein Dam

Physical Information Operating Rule Sterkfontein Dam (on the Wilge River, a tributary of the ), along with Grootdraai

Quaternary FSC* 2 Wall height Wall length Dam, , Vaal Barrage and Bloemhof Dam (all on the Vaal River) form part of Dam name River 3 FSA (km ) Owner DWA code catchment (million m ) (m) (m) the Bloemhof Sub-system, which is part of the greater Integrated Vaal River System. Woodstock Dam and the Driel Barrage (situated in the Thukela River catchment), form Nuwejaars Sterkfontein C81D 2,616.95 67.26 DWA C8R003 69 3,060 the Thukela Transfer Scheme into the Vaal catchment. The large scheme is operated as Spruit follows: The Thukela system supports Sterkfontein Dam until the dam is full. The transfer * Live full supply capacity (SANCOLD, 2009) limit is 606 million m3/a. When the Vaal Dam is at 15% storage or less, Sterkfontein will begin to support it. Abstractions at Sedibeng and Midvaal make use of local runoff Demands/abstractions (million m3/a) and spills from upstream dams. When this is not adequate, the Vaal Dam supports the Year of completion 1:50 yield (million Maximum spillway abstractions. The Vaal Dam will only begin to support Bloemhof Dam when Bloemhof m3/a) capacity (m3/s) Domestic Irrigation Other Dam reaches its minimum operating level (1,213.6 m).

1974 Unknown Unknown Unknown Unknown Unknown

s rt ts Ha ar ot- -H ro in Loop G e Vaal Kl VEREENINGING POTCHEFSTROOM KLERKSDORP Vaal Grootdraai Area–Capacity Relationship Dam Dam l va ter Witbank Yster K a Harts r W om elm Vaal boo Elevation (m) Storage (million m3) Surface area (km2) Vaal g Klip

B M a a

m k w

b H Wilge a

o e

s

e u

s s n Renoster i e ing 1,702 2,616.95 67.26 Vals Krom KROONSTAD RSA Hol 1,675 1,050.95 47.13 NEWCASTLE i Bloemhof e B () Vals l u f V f a s l o Dam g Blom r

e

1,664 590.24 36.53 WELKOM b

n

e

b

e

i L Sa 1,656 335.16 26.68 nd RSA D Allemanskraal o BETHLEHEM Vet r ing Dam Sterkfontein (KwaZulu- 1,651 217.40 20.49 Dam B Erfenis

Taaibos o Natal) s Sand Sundays s Dam Laai i PHUTHADITJABA e Klein-vet 1,644 101.52 12.72 Caledon G Krugersdrift ro Doring o Tugela t-v Dam e H Khubelu Tugela t l s 1,634 20.61 4.38 ot an Modder se kr ou Bl Malibamatso u Senqunyana 1,630 6.88 2.56 ee BLOEMFONTEIN L Rustfontein Katse Dam Dam 1,621 0.05 0.04 Tierpoort M MASERU o LESOTHO d

d

Dam e

r n do Riet Fourie Cale Mohale Mkom 1,617 0.00 0.00 azi

Makhaleng Dam Dam network in the upper areas of the Orange–Senqu basin