Question Statement:
A 4-h unit hydrograph (UH) is used to derive an S-hydrograph. The ordinates of the 4-h UH are given in the table below:
| Time (h) | 0 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 | 36 | 40 | 44 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4-h UH ordinates (m³ s⁻¹) | 0 | 20 | 80 | 130 | 150 | 130 | 90 | 52 | 27 | 15 | 5 | 0 |
Equilibrium discharge and its time of occurrence for the derived S-hydrograph are:
Options:
- (A) 150 m³ s⁻¹ and 16 h
- (B) 380 m³ s⁻¹ and 16 h
- (C) 699 m³ s⁻¹ and 40 h
- (D) 699 m³ s⁻¹ and 44 h