CIV E 445 - APPLIED HYDROLOGY
SPRING 2014
LAB No. 6
A unit hydrograph is to be developed for a 29.6 km2 watershed
with 4-h T2 lag.
A 1-h rainfall
has produced the runoff hydrograph shown in the table below. Develop a 1-h unit hydrograph (1 cm of runoff) for this watershed.
| Time (h) | Flow
(m3/s) |
| 0 | 1 |
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 12 |
| 5 | 8 |
| 6 | 7 |
| 7 | 6 |
| 8 | 5 |
| 9 | 4 |
| 10 | 3 |
| 11 | 2 |
| 12 | 1 |
The event precipitation is P = 20 cm. The runoff curve number is CN = 78. What is the runoff?
Use ONLINE CURVE NUMBER.
The event precipitation is P = 8 in. The runoff curve number is CN = 84. What is the runoff?
Use ONLINE CURVE NUMBER.
What is the PZN (precipitation zone number) (AMC) for a 100-yr frequency event in the San Diego coast?
In the foothills? In the mountains? In the desert? [Refer to the San Diego County Hydrology Manual].
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