The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment

1.	The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t , is
A.	The slope of the 1-hour unit hydrograph at that time
B.	The slope of the direct runoff unit hydrograph at that time
C.	Difference in the slope of the S -curve and 1-hour unit hydrograph
D.	The slope of the S -curve with effective rainfall intensity of 1 cm/hr
Answer» E.

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The ordinate of the Instantaneous Unit Hydrograph (IUH) of a catchment at any time t , is

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