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An inflow hydrograph is routed through a reservoir to produce an outflow hydrograph. The peak flow of the inflow hydrograph is PI and the time of occurrence of the peak is tI. The peak flow of the outflow hydrograph is P0 and the time of occurrence of the peak is t0. Which one of the following statements is correct?
Instantaneous unit hydrograph is a hydrograph ofi) unit durationii) unit rainfall excessiii) infinitely small durationiv) infinitely small rainfall excessThe correct answer is
Instantaneous unit hydrograph is a hydrograph of
i) unit duration
ii) unit rainfall excess
iii) infinitely small duration
iv) infinitely small rainfall excess
The correct answer is
The unit hydrograph of a specified duration can be used to evaluate the hydrograph of storms of
The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by
A peak flow of a flow of a flood hydrograph due to a six-hour storm is 470 m3/s. The corresponding average depth of rainfall is 8 cm.Assume an infiltration loss of 0.25 cm/hour and a constant base flow of 15 m3/s. What is the peak discharge of 6 hour unit hydrograph for this catchment?
When is the Hydrograph called as a unit hydrograph?
The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be
S-curve Hydrograph is the hydrograph
Consider the following statements regarding channel routing : 1. In channel routing, the flood hydrograph at various sections of the reach is predicted by considering a channel reach and an input hydrograph at the upstream end. 2. As the flood wave moves down the river, the shape of the wave does not change. 3. Flood waves passing down a river have their peaks attenuated due to friction. 4. The addition of lateral inflows can cause an increase of attenuation. Which of the above statements are not correct?