Runoff from watershed (hydrology)

[tzx9633]

Homework Statement

A watershed with a surface area of 3100km^2 received 170cm of precipitation during a one year period . Durign the same year , the outflow was 50(m^3)/sec .Calculate the amount of water lost due to combined effects of evaporation , transpiration and infiltration. Also estimate the runoff from the watershed .

Homework Equations

The Attempt at a Solution

For this question , i am not sure how to do . But , i studied the formula of I-Q = dS/dt , where I - inflow , Q - outflow , dS/dt = change of storage over time

so , i let total inflow = outflow + combined effects of losses.. I am not sure how to get the runoff volume

so , i already gt total lost = 119cm . Bu t, how to get runoff ? I don't think we can get runoff directly from this question . I think the question got problem

 

[tzx9633]

Can anyone help ?

 

[CWatters]

I agree with your answer 119cm.

I also think there is something wrong with the question.. I think total runoff = outflow + ground water flow but the problem doesn't give info on the ground water flow. Is there more information in other parts of the question?

 

[tzx9633]

I agree with your answer 119cm.

I also think there is something wrong with the question.. I think total runoff = outflow + ground water flow but the problem doesn't give info on the ground water flow. Is there more information in other parts of the question?

It seems that you are familiar with hydrology , can you help me out in this thread ? https://www.physicsforums.com/threads/double-mass-curve.927072/#post-5851756

Thanks in advance !

 

[tzx9633]

I agree with your answer 119cm.

I also think there is something wrong with the question.. I think total runoff = outflow + ground water flow but the problem doesn't give info on the ground water flow. Is there more information in other parts of the question?

or the runoff here simply means loss to outflow = 50cm ?