TOP OF DAM

998.5 m

FLOOD CONTROL ZONE

998 m

Induces surcharge

Release water from Spillway using defined release discharge

Forces flood flows over the spillway

CONSERVATION ZONE

Varies between 998 and 997.3 m

This is the range of the guide curve elevation. Calculation is done in Excel

Gaborone IF Functions

ELSE IF Gaborone Dam Pool >998 m

Maximum release of 3.6 cms

Spillways open

ELSE IF Gaborone Dam Pool >983 and <998 m

Normal release of 0.63 cms

Spillways closed

Controlled outlet open

IF Gaborone Dam pool ≤ 983 m

Maximum Release of 0 cms

Spillways are closed

Controlled outlet closed

INACTIVE

983 m

Dead storage, no releases below this elevation