Dam Parameters

Gaborone Dam

Bokaa Dam

Nnywane Dam

Dam Type

Earthcore Fill

Earthcore Fill

Earthcore Fill

River dammed

Notwane

Metsimotlhabe

Nnywane

Year Constructed

1963, raised 1984

1993

1970

Full Supply Level (FSL)

EL 998 masl

EL 954 masl

EL 1135 masl

Spillway Length

272 m

690 m

80 m

Catchment Area

4300 km2

3570 km2

238 km2

Active Storage

141.5 MCM

18.82 MCM

2.3 MCM

Surface Area (FSL)

19 km2

6.6 km2

1.65 km2

Dead storage

3.71 MCM

0.25 MCM

0.002 MCM

Area supplied

Greater Gaborone

Greater Gaborone

Greater Gaborone

% contribution to area supplied

56%

25%

10%