a) Why is base flow separated from the flood hydrograph in the proces…
Previous year question for Hydrology and Irrigation Engineering.
Question
a) Why is base flow separated from the flood hydrograph in the process of developing a unit hydrograph. (8)
b) Given below are the ordinates of a unit hydrograph, derived from a storm on a $1329\text{ sq km}$ catchment, and believed to have resulted from a rain of $3\text{ hour}$ unit duration. (12)
| Hour | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Runoff $\text{m}^3$ | 0 | 165 | 547 | 750 | 580 | 465 | 352 | 262 | 195 | 143 | 97 | 60 | 33 | 15 | 7 | 0 |
Determine the unit hydrograph of $1\text{ hour}$ unit duration by S-curve hydrograph.
- Year: 2018
- Subject: Hydrology and Irrigation Engineering