Construction of a barrage on Sg. Johor for water supply enhancement is expected to cause back water and increase the flo

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Construction Of A Barrage On Sg Johor For Water Supply Enhancement Is Expected To Cause Back Water And Increase The Flo 1 (107.53 KiB) Viewed 45 times

Construction of a barrage on Sg. Johor for water supply enhancement is expected to cause back water and increase the flood potential in the upstream. The water level before and after the barrage construction for various peak flow values and their corresponding return periods are given in TABLE (i). The incremental damages above the first-floor elevation and the property value are given in TABLE (ii). The percentage of area affected by flood (above the first-floor elevation) is given by the following equation; p=2+3H-0.3H² where p is the percentage of flooded area and H is elevation above the first floor. Calculate the additional average property damages due to flood associated with the barrage construction. TABLE (i): Water level for various peak flow before and after barrage construction at Sg. Johor Peakflow (m³/s) 200 350 500 700 Return Period (yr) 10 50 100 200 Without Barrage (m) 30 31 32 33 34 (m) 29.5 30.5 31.0 31.5 TABLE (ii): Property values above the first floor 1st Floor Elevation Property values (RM million) With Barrage (m) 29.5 31.0 30 70 60 50 25 32.5 34.0