- Direct Runoff Hydrograph (DRH) was observed from the urbanized catchment and rural catchment less than 10% development.
i. Sketch the DRH for urbanized catchment and rural catchment.
ii. Describe the differences between DRH for urbanized catchment and rural catchment. The description shall be based on the five (5) features or characteristics (describe the differences for each characteristic) of DRH. - . A hydrograph for a basin of 165.5 km2 was obtained based on the rainfall and streamflow data as tabulated below.
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- Obtain a Unit Hydrograph for a basin above. Use the horizontal straight-line method to separate baseflow.
- Determine the volume of losses.
- Compute the φ-index equal to the ratio of the volume of losses to the rainfall duration.
- Predict the total streamflow hydrograph that would be observed due to a storm whose effective rainfall as tabulated below. Use the same value of baseflow. Use superposition and proportionality principles.
- Plot the unit hydrograph and the predicted streamflow hydrograph.
- Based on item (i), assume it is a 1-hour UH, and derive the ordinates of a 2-hour unit hydrograph for the same basin using a method of superposition.
- Based on item (i), assume it is a 1-hour UH, and derive the ordinates of a 2-hour unit hydrograph for the same basin using the S-Curve method.
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