Discuss why Rational Method should not be used for large catchments in estimating peak runoff? Give reasons to support your response.
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Discuss why Rational Method should not be used for large catchments in estimating peak runoff? Give reasons to support your response.
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- Rational Method should not be used for large catchments in estimating peak runoff. Is it true?What is meant by 75% dependable yield of a catchment? Indicate a procedure to estimate the same by using annual runoff volume time series.What is a flow-duration curve? What information can v=be gathered from a study of flow-duration curve of a stream at a site? List the factors affecting the seasonal and annual runoff (yield) of a catchment. Describe the listed factors.
- Based on 14 days runoff data given in TABLE Q3(c), determine the unit hydrograph for the catchment if the area is 4500 km². Separate the baseflow by using appropriate method.Problem 4.11. Assuming a dimesionless hydrograph is applicable, determine the duration of flow if the peak runoff is 8.5 m³/s (300 cfs) and the volume of flow is 100 mm (4 in.) for a 50-year storm from an 85-ha (210 ac) watershed. What are the coordinates for point n on the design hydrograph?During a flood in a catchment, when all streams are filled with water, the runoff value is ? A- at the rising limb of the hydrograph. B- at the falling limb of the hydrograph. C- at the falling limb of the hydrograph. D- at the second base flow recession part. What is the correct answer??
- The ordinates of a hydrograph of surface runoff resulting from 4.5cm of rainfall excess of duration 8 hours in a catchment are as follows. Determine the ordinates of the 8h unit hydrograph for this catchment. Tabulate your solution and plot the 8H-UH.For the relation between direct runoff and time? A- It starts and end with base flow. B- It starts before base flow and ends after. C- it It starts and end with direct runoff. D- It starts before base flow and ends with it. What is the correct answer??The ordinates of a 6h-UH of a watershed having a drainage area of 393 km^2 are given below. For a storm over the watershed having excess rainfall of 5 cm for the first six hours and 15 cm for the second six hours, compute the direct runoff hydrograph ordinates and plot the hydrograph. Compute the depth of direct runoff in cm. Assuming constant baseflow of 100 m^3/s, compute the storm hydrograph ordinates and plot the hydrograph. (List all the DRH ordinates in order, separated by a single space.)
- (a) A flood drainage channel has to be designed to carry runoff from 200 km² area. If the flow per square kilometer is 0.5 m³/s/km², determine the flood drainage channel size using (i) the permissible velocity method, and (ii) tractive force method. The material size is 2 mm and S,=0.00002. Provide sufficient justification for assumptions and/or judgement used in your procedure. State clearly the design steps used in the design process. (b) The reservoir level upstream of a 30-m-wide spillway for a flow of 800 m³/s is at El. 250 m and downstream river level channel for this design flow is at El. 150 m. If the stilling basin width is the same as that of the spillway, compute the floor level of the stilling basin so that the jump is formed in the basin. Assume the losses in the spillway are negligible. What would be the basin invert level if one can use an end sill or one row of baffle blocks and an end sill? (c) A mountain creek with a flow rate of 100 ft/s passes through an eight-ft…Please help, the area runoff coefficient and inlet time for each sub catchment shown in the table.Determine the following:What is Rainfall-Run off Relation?Definition of HydrographWhat is a Hydrograph Separation?What is a Unit Hydrograph?Estimation of Discharge using HydrographWhat is Rational Formula and SCS Curve?Please type it in here instead of writing it on a piece of paper
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