CIV E 634 - SURFACE WATER HYDROLOGY
SPRING 2009
HOMEWORK 6:   CATCHMENT MODELING

  1. The watershed of the La Leche river has the following time-area histogram:

    Time (hr)             0          1          2          3          4

    Area (km2)              148      252      318       189

    Use onlinerouting06 (the time-area method) to calculate the flood hydrograph for the following effective storm pattern:

    Time (hr)                                 0         1         2         3         4         5         6

    Effective rainfall (cm/hr)               1          3         4         3          2         1

  2. Use onlinerouting07 (the Clark UH) to calculate a 2-hr unit hydrograph for the La Leche basin, with the following time-area histogram:

    Time (hr)             0          1          2          3          4

    Area (km2)              148      252      318       189

    • Assume Δt = 1 hr, and K = 3 hr.

    • Assume Δt = 2 hr, and K = 4 hr.