Which of the following statements is/are correct for Hydrograph Analysis?
1
The basic assumption in Unit hydrograph theory is Time invariance and linear response
2
A single peak hydrograph resulting from a isolated storm has a single inflection point.
3
Synthetic unit hydrographs are derived by relating the basin characteristics to the unit hydrograph.
4
The peak ordinate of 6-hr unit hydrograph of a given basin will be greater than 3-hr unit hydrograph of the same basin.