Synthetic Unit Hydrograph

Q. In Snyder's method of synthetic unit hydrograph development, basin lag is taken as

1. the time interval between centroid of the rainfall excess and surface runoff
2. the time interval from mid point of the unit rainfall excess to the peak of the unit hydrograph
3. independent of rainfall duration
4. independent of catchment characteristics

Q. In constructing a 4 hour synthetic unit hydrograph for a basin, the lag time is estimated to be 40 hours. When will the peak discharge in the Synthetic Unit Hydrograph occur from the start of the storm?

1. 36 hours
2. 40 hours
3. 42 hours
4. 44 hours

Q. The peak discharge, by using Snyder's method of unit hydrograph of standard duration (hour)having catchment area, regional constant and basin lag as 200 $k{m}^2$, 0.6 and 6 hour respectively, will be

1. $51.28m^3/sec$
2. $55.6m^3/sec$
3. $60.75m^3/sec$
   
4. $64.55m^3/sec$