(c) You have a one store catchment model that includes baseflow, evapotranspirat
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Question
(c) You have a one store catchment model that includes baseflow, evapotranspiration and surface runoff due to saturation excess. The following information is available. The initial storage, S, (i.e. at the start of the day) is 50mm. The storage capacity, Smax, is 100mm. The precipitation for the day is 30mm 20% of the catchment is saturated. All rainfall falling on the saturated area can be assumed to runoff as surface flow and it can be assumed that the saturated area does not change during the day. The actual evapotranspiration can be calculated as AET = PET*SS.ar The baseflow for the day is Imm. .The catchment area is 100km Estimate the actual evapotranspiration for the day ii. Estimate the surface runoff depth for the day (averaged over the catchment) iii. Estimate the total runoff volume for the day iv. Estimate the catchment storage at the end of the day. i. (2 marks) (2 marks) (3 marks)Explanation / Answer
1) actual evaprotranspiration is AET = PET*S/ Smax
= 10*50/100
= 5
2) runoff depth of the day is = catchment area / presipitation of the day
= 100/30
=3.33
3) runoff volume= AET* total catchment / presipitation
=5*20*100/30
=333
4)total catchment storage is = catchment area* presipitation* AET
= 100*30*5
= 15000
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