Analyse a 500-hectare urban watershed near Pretoria, which has a Mean Annual Precipitation of 700 mm...

 

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Analyse a 500-hectare urban watershed near Pretoria, which has a Mean Annual Precipitation of 700 mm for a 10-year return period storm. The watershed is developed as follows: Lawns: heavy soil, flat 50 ha. Residential: single family areas 250 ha. %3D Industrial: light areas 150 ha. Streets: Asphaltic 50 ha. The hydrologic flow path for this watershed = 1990 m. The roughness coefficient is denoted (r) Segment Type of Flow Length Slope (%) 1 Overland flow, (r) =0.35 750 m 2.5 % 2 Kerb and channel 1100 m 3.5 % 3 Stream flow 140 m 4.5 % 11.1. Calculate the composite runoff coefficient C 11.2. Calculate time of concentration TC if the flow condition are as listed below 11.3. Calculate Rainfall intensity 11.4. Calculate peak discharge %3D Analyse a 500-hectare urban watershed near Pretoria, which has a Mean Annual Precipitation of 700 mm for a 10-year return period storm. The watershed is developed as follows: Lawns: heavy soil, flat 50 ha. Residential: single family areas 250 ha. %3D Industrial: light areas 150 ha. Streets: Asphaltic 50 ha. The hydrologic flow path for this watershed = 1990 m. The roughness coefficient is denoted (r) Segment Type of Flow Length Slope (%) 1 Overland flow, (r) =0.35 750 m 2.5 % 2 Kerb and channel 1100 m 3.5 % 3 Stream flow 140 m 4.5 % 11.1. Calculate the composite runoff coefficient C 11.2. Calculate time of concentration TC if the flow condition are as listed below 11.3. Calculate Rainfall intensity 11.4. Calculate peak discharge %3D

Answer rating: 100% (QA)

111 Rainfall coefficients for different areas are given below Lawns heavy soil flat 015 Residential ... View the full answer