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- Water Resources Engineering - WRE
- 2017
- PYQ
**Biju Patnaik University of Technology Rourkela Odisha - BPUT**- Civil Engineering
- B.Tech
**12127 Views**- 324 Offline Downloads
- Uploaded 1 year ago

Registration No: Total Number of Pages: 02 B.Tech. PCI5J001 5th Semester Regular Examination 2017-18 Water Resources Engineering BRANCH: CIVIL Time: 3 Hours Max Marks: 100 Q.CODE: B263 Answer Question No.1 and 2 which are compulsory and any four from the rest. The figures in the right hand margin indicate marks. Q1 a) b) c) d) e) f) g) h) i) j) Q2 a) b) c) d) e) f) g) h) i) j) Q3 a) b) Answer the following questions:multiple type or dash fill up type If p is the precipitation, a is the area represented by a rain gauge,and n is the number of rain gauges in a catchment area, then the weighted mean rainfall is ……. Mean precipitation over an area is best obtained from gauged amounts by ….. method. If a 4-hour unit hydrograph of a certain basin has a peak ordinate of 80 m3/s, the peak ordinate of a 2-hour unit hydrogaph for the same basin will be…… The rainfall in four successive 12 hours period on a catchment are 40, 80, 90 and 30 mm. If the infiltration index ∅ for the storm is 5 mm/hour, then the total surface run off will be ……… If storage, inflow rate and outflow rate are denoted by S , I and Q respectively, then the value of S in Muskingham method of flood routing is …………… The most suitable chemical which can be applied to the water surface for reducing evaporation is…….. Hydrograph is the graphical representation of………… and ………………. If the stage- discharge relationship for a gauging section is constant and does not change with time, the control is said to be …….. A rectangular channel carries a certain flow for which the alternate depths are found to be 3 m and 1 m, the critical depth for this flow is …… The sequent depth ratio in a hydraulic jump formed in a horizontal rectangular channel is 16.48. The Froude number of the super-critical stream is …….. (2x10) Answer the following questions: Short answer type What are the possible sources of error in the measurement of precipitation? Define pan coefficient. Differentiate between ɸ-index and W- index. Differentiate between direct runoff and base flow. What is the probability of a flood equal to or greater than 25 years flood occurring once in the next three years ? Write two methods of deriving unit hydrograph from complex storms. Write the differential equation of storage. What do you mean by attenuation? An open channel carries water with a velocity of 0.5 m/s. If the average bed shear stress is 1.0 N/m2, the Chezy coefficient C is. What is conveyance of a channel? (2x10) Describe the principle of working of a weighing bucket type recording raingauge with a neat sketch. What are its advantages and disadvantages? Define pan coefficient. Discuss the relative merits and demerits of sunken, floating and land pans. (10) (5)

Q4 a) Define catchment. Explain how the catchment boundary can be obtained from the topographic maps. Describe the principle involved in the measurement of stream flow by dilution method. What are the requisites of a good tracer used in the dilution method ? (8) Q5 In order to compute the flood discharge in a stream by the slope area method the following data has been obtained. u/s section middle section d/s section Area 108.6 m2 103.1 m2 99.8 m2 Wetted 65.3 m 60.7 m 59.4 m Perimeter Gauge reading 316.8 m 316.55 m Determine the flood discharge assuming Manning’s n = 0.029 and length between u/s and d/s section as 250 m. (15) Q6 The ordinate of a 4 h unit hydrograph of a basin of particular basin are given below. Determine the ordinates of the S- curve hydrograph and there from the ordinate of the 6 h unit hydrograph. Time (hr) 4-hr UGO (cumec) Time 4-hr UGO (hr) (cumec) 0 0 14 70 (15) b) 2 4 6 8 10 12 Q7 a) b) Q8 a) b) Q9 a) b) c) 25 100 160 190 170 110 16 18 20 22 24 (7) 30 20 6 1.5 0 The inflow hydrograph into a linear reservoir is triangular in shape with time base of 20 h and a peak flow of 240 m3/s occurring at 8 h. Assume that the storage constant of the reservoir is 2 h and the outflow from the reservoir at the time of arrival of the inflow is zero. Route the inflow hydrograph with Δt = 2 h. and find the peak outflow. Define IUH. How can IUH be derived from S-Curve? (10) Determine the most efficient section of a trapezoidal channel with side slope 2H: 1V, carrying discharge of 11.25 m3/s with a velocity of 0.75 m/s. What should be the bed slope of the channel. Take mannings η = 0.025. What are the assumptions for Gradually Varied Flow? Give two examples and Derive the equation for GVF. (8) Write short notes of the following : Evapo-transporation Synthetic hydrograph Specific energy (5) (7) (5) (5) (5)

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