Question

2) Compute the flood discharge through a uniform, straight river reach of 150 m for the following data: Manning's n for Channels (Chow, 1959). Type of Channel and Description Minimum Natural streams - minor streams (top width at floodstage < 100 ft) 1. Main Channels a clean, straight, full stage, no rifts or deep pools 0.025 1 b. same as above, but more stones and weeds 0.030 C. clean, winding, some pools and shoals 0.033 d. same as above, but some weeds and stones 0.035 e same as above, lower stages, more ineffective slopes and sections f. same as "d" with more stones 0.045 g. sluggish reaches, weedy, deep pools 0.050 h. very weedy reaches, deep pools, or floodways with heavy stand of timber and underbrush 0.075 0.040 3) Distinguish the Evaporation Pan Method and Water Balance Method by completing the table given: Criteria: Evaporation Pan Method Water Balance Method Horizontal (Category) Axis / / S / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /

Answer 1

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