The following are involved in arriving at a unit hydrograph:1. Estimating the surface runoff in depth2. Estimating the surface runoff in volume3. Separation of base flow.4. Dividing surface runoff ordinates by depth of runoffThe correct sequence of these steps is

The following are involved in arriving at a unit hydrograph:1. Estimat

1.	The following are involved in arriving at a unit hydrograph:1. Estimating the surface runoff in depth2. Estimating the surface runoff in volume3. Separation of base flow.4. Dividing surface runoff ordinates by depth of runoffThe correct sequence of these steps is
A.	3, 2, 1, 4
B.	2, 3, 4, 1
C.	3, 1, 2, 4
D.	4, 3, 2, 1
Answer» B. 2, 3, 4, 1