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PHASE 2A: DE HOOP DAM FACT SHEET |
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| Province: |
Limpopo |
| District: |
Steelpoort |
| Position: |
Latitude: 24° 57’ 29” South
Longitude: 29° 57’ 25” East |
| Nearest towns: |
Steelpoort: 40 km
Roossenekal: 38 km |
| Nearest railway station: |
Roossenekal: 38 km |
| 1:50 000 maps: |
2429 DD Jane Furse & 2529 BB Roossenekal |
| Dam Classification |
| Category: |
III |
| Size class: |
Large |
| Hazard potential rating: |
High |
| Reservoir Information |
| Full supply level (FSL): |
RL 915,00 m |
| Design overflow flood level (1:200 year flood): |
RL 917,90 m |
| Safety evaluation discharge level (SED): |
RL 921,47 m |
| Lowest drawdown level (LDDL): |
RL 875,00 m |
| Reservoir yield: (domestic, 98% confidence) |
80 x 106 m3/annum |
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At FSL |
at LDDL |
| Reservoir capacity: |
347x106 m3 |
15x106 m3 |
| Reservoir surface area: |
1690 ha |
190 ha |
| Hydrology |
| Drainage region: |
B400 |
| River: |
Steelpoort River |
| Catchment area: |
2865 km2 |
| Mean annual runoff: |
116 x 106 m3 |
| Mean annual precipitation: |
706 mm |
| Structural Information |
| Type of dam: |
RCC Gravity |
| Type of spillway: |
uncontrolled central ogee |
Overall length of wall:
Length of spillway:
Length of right NOC:
Length of left NOC:
Outlet works:
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1 015 m
110 m
98 m
790 m
17 m |
Crest levels:
Spillway:
NOC left flank:
NOC right flank: |
RL 915,00 m
RL 921,00 m
RL 921,50 m |
| River bed level: |
RL 850,00 m |
| Lowest foundation level: |
RL 840,00 m |
| Max height of NOC above lowest foundation: |
81,5 m |
| Crest width: |
7 m – right flank
6 m – left flank |
| Upstream slope: |
vertical |
| Downstream slope: |
1 V : 0,8 H |
| Volumes |
Hard excavation:
|
145 000 m3 |
| Soft excavation: |
97 000 m3 |
| RCC: |
500 000 m3 |
| Mass concrete: |
200 000 m3 |
| Structural concrete: |
50 000 m3 |
| Spillway |
| Crest length: |
110 m |
| Total freeboard: |
6 m |
| Design flood discharge: |
1 140 m3/s nbsp (Check 1104 m3/s also given on dwgs) |
| Spillway discharge at NOC: |
3 616 m3/s |
| Safety evaluation discharge (SED): |
4 463 m3/s |
| Inflow Flood Peaks |
| Return Period (Years): |
Inflow peak (m3/s): |
| 2 |
94 |
| 5 |
206 |
| 10 |
332 |
| 20 |
502 |
| 50 |
804 |
| 100 |
1 100 |
| 200 |
1 460 |
| Safety evaluation flood (SEF): |
5 350 |
| Regional maximum flood (RMF): |
3 520 |
| Outlet Works |
| Twin stacks of multi-level off-takes |
Combined capacity:
|
20 m3/s |
Service outlet valves:
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2 x 1 000 mm sleeve valves
2 x 600 mm sleeve valves |
| Route R555 (Provincial Road P169-1) Realignment |
| Length of realignment: |
2 0 km |
| Design speed: |
100 km/h |
| Minimum horizontal curve radius: |
450m |
| Maximum gradient: |
4,94% |
| Vertical curve length: |
180m |
| Road width: |
2 x 3,7 m lanes with 3,0 m shoulders |
| Road reserve width (minimum): |
40 m |
Bridges:
Steelpoort River upstream of dam
Masekete Spruit
Steelpoort River downstream of dam
Total bridge width
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3 spans of 20m each
Single 20m span
2 spans of 20m each
13,95m |
| ORWRDP Phasing Schedule |
Phase |
Component |
Construction |
Commissioning |
| 1 |
Raising of Flag Boshielo Dam |
2004 – 2006 |
2006 |
| 2A |
De Hoop Dam |
2006 – 2010 |
2009 |
| 2B |
Flag Boshielo to Mokopane pipeline |
2008 – 2009 |
2009 |
| 2C |
Steelpoort Weir and abstraction works |
2008 – 2009 |
2009 |
| 2D |
2nd pipeline from Steelpoort Weir to Mooihoek |
2010 – 2011 |
2011 |
| 2E |
2nd pipeline parallel to Lebalelo Scheme |
> 2025 |
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| 2F |
Connect Lebalelo Scheme to Olifantspoort |
2012 – 2013 |
2013 |
| 2G |
2nd pipeline from Flag Boshielo to Mokopane |
> 2025 |
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| 2H |
Incorporate Lebalelo Scheme |
2008 – 2009 |
2009 |
Note: Implementation of Phases 2B to 2H to be regularly reviewed.
>> Print Fact Sheet [PDF -
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