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Which of the following will pose difficulties in adopting U.H.G. principles and processes in evaluating flood hydrographs of basins? 1. non-uniform real distribution within a storm 2. Intensity variation within a storm 3. The centre of the storm varies from storm to storm in case of large catchments 4. Dividing into a number of sub-basins and routing the individual DRHs through their respective channels to obtain the composite DRH at the basin outlet 5. Large storages within the catchment
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?
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?
In the following question, sentences of a paragraph have been jumbled and labelled as A, B, C and D. You are required to rearrange the jumbled sentences of the paragraph and mark your response accordingly by selecting the correct option. A: Water harvesting means capturing rain where it falls or capturing the runoff in your own village or town. B: It also provides for the measures that should be taken to keep that water clean by not allowing polluting activities to take place in the catchment. C: Water harvesting can be undertaken through a variety of ways, such as, capturing runoff from rooftops, capturing runoff from local catchments, capturing seasonal floodwaters from local streams, etc. D: These techniques can serve purposes, such as, provide drinking water, provide irrigation water, increase groundwater recharge, etc.
A 6 hours storm had 4 cm of rainfall and the resulting runoff was 2 cm. If ϕ index remains at the same value, the runoff due to 10 cm of rainfall in 12 hours in the catchment is
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
An 8-hour storm with incremental rainfall during each successive hour is tabulated herewith. What will be the correction to total runoff when, whereas the actual ϕ index was 0.5 cm/hour, a wrong magnitude of 0.6 cm/hour was adopted in computing the total runoff? Time from start (hour) Incremental rainfall in each hour (cm) 1 0.4 2 0.8 3 1.2 4 0.9 5 1.8 6 1.0 7 0.3 8 0.8
In order to prevent pollution from landfill operation which of the following provisions are supposed to be made? (i) The storm water drain shall be designed and constructed in such a way that the surface runoff water is diverted from the landfilling site and leachates from solid waste locations do not get mixed with the surface runoff water (ii) Non-permeable lining system should be provided at the base and walls of waste disposal area. (iii) Provisions for management of leachates including its collection and treatment shall be made.
Statement I): Collin’s method for the determination of the unit hydrograph for a mutli-period storm considers residuals as attributable to the unit graph of the period of the largest rain. Statement II): Collin’s method is ab initio premised on the Bernard method where a unit graph is necessarily to be proportional to the net rain.