willowthewisp
New member
- Joined
- Aug 25, 2013
- Messages
- 5
Hi folks, this is my first post and I'm not sure I picked the right forum but I have a surface water budget word problem that I am having trouble with solving. Any help would be greatly appreciated.
"a lake has a surface area of 200 km2. Annual precipitation rates are 250 mm (assume no infiltration) and evapotranspiration rates are 95 mm annually. Stream inflow is 1690 ft3/sec and stream outflow is 921 ft3/sec. groundwater seepage into the lake is 1 cm/day. Determine how much water annually can be diverted from the lake for agriculture to prevent long-lasting water level changes in the lake."
the equation to be used is: S = P + Qin +Qg - Qout - Es - Ts - I.
S is change in storage, P is precipitation, Qin is stream inflow, Qg is groundwater to stream, Qout is stream outlfow, Es is evaporation, Ts is transpiration and I is infiltration.
I need my answer to be in cm/year.
thanks for looking.
"a lake has a surface area of 200 km2. Annual precipitation rates are 250 mm (assume no infiltration) and evapotranspiration rates are 95 mm annually. Stream inflow is 1690 ft3/sec and stream outflow is 921 ft3/sec. groundwater seepage into the lake is 1 cm/day. Determine how much water annually can be diverted from the lake for agriculture to prevent long-lasting water level changes in the lake."
the equation to be used is: S = P + Qin +Qg - Qout - Es - Ts - I.
S is change in storage, P is precipitation, Qin is stream inflow, Qg is groundwater to stream, Qout is stream outlfow, Es is evaporation, Ts is transpiration and I is infiltration.
I need my answer to be in cm/year.
thanks for looking.