b) A catchment has a 2 hour triangular unit hydrograph which increases from 0 at time 0 to 50m ³/s at time 10 (hour) and

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B A Catchment Has A 2 Hour Triangular Unit Hydrograph Which Increases From 0 At Time 0 To 50m S At Time 10 Hour And 1 (89.91 KiB) Viewed 6 times

b) A catchment has a 2 hour triangular unit hydrograph which increases from 0 at time 0 to 50m ³/s at time 10 (hour) and then returns to 0 at time 20 (hour). The baseflow may be assumed as being constant at 20m³/s. If the design storm is taken to be two successive 2-hour periods of effective rain of 4cm and 2cm respectively then: i) Estimate the peak flow and time of peak flow. (7 marks) ii) Plot the total discharge hydrograph and determine for how long the discharge would be greater than the channel capacity of 160m³/s. (6 marks) iii) Estimate how much storage would be required to limit the flow in the channel to 160m³/s.