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- Water Resources Engineering - WRE
- 2017
- PYQ
**Biju Patnaik University of Technology Rourkela Odisha - BPUT**- Civil Engineering
- B.Tech
**6334 Views**- 181 Offline Downloads
- Uploaded 1 year ago

Registration No: Total Number of Pages : 02 B.Tech. PECI5401 7th Semester Regular/Back Examination 2017-18 Water Resources Engineering BRANCH : CIVIL Time : 3 Hours Max Marks : 70 Q.CODE : B338 Answer Question No.1 which is compulsory and any five from the rest. The figures in the right hand margin indicate marks. Q1 Answer the following questions : What are the precautions to be taken in selecting site for the location of a rain gauge ? Define probable maximum precipitation. Differentiate between perennial and ephemeral stream. What are the limitations of unit hydrograph theory? What is the probability that 5 year flood will occur at least once during next 3 years? As the rainfall supply continues, the rate of infiltration decreases, Why? What is flood routing? What is the philosophy of most economical sections? What are the functions of jetties? What is the importance of specific energy diagram? (2x10) Q2 a) b) Explain Hydrologic Cycle with neat sketch. A 6 hr storm produced rainfall intensities of 7, 18, 25, 12, 10 and 3 mm/hr in successive one hour intervals in a basin of 800 sq.km. The resulting runoff is observed to be 2640 ha.m. Determine Ø- index for the basin. (5) (5) Q3 a) Explain briefly the dilution method of flow measurement. List the qualities of a good tracer for use in this method. How do you measure evaporation using Pan and Water Budget Equation Method? (5) In a 4 hr. storm with 50 mm of excess rainfall from a basin, the flows in the stream were as follows : (4+4) a) b) c) d) e) f) g) h) i) j) b) Q4 a) Time (hrs) Flow (m3/s) 0 0 2 1.22 4 4.05 6 6.75 8 5.67 12 3.35 16 1.35 (5) 20 0 Determine the ordinates of unit hydrograph. Estimate the peak flow and the time of its occurrence in a flood created by a 8 hr storm, which results in 2.5 cm of effective rainfall during the first 4 hours and 3.75 cm of effective rainfall during the second 4 hours. Assume the base flow as negligible. b) Q5 a) b) What are the factors which affect the flood hydrograph? (2) Write a brief note on frequency factor and its estimation by Gumbel’s method. (5) Differentiate between hydraulic and hydrological method of flood routing. (5)

Q6 a) b) Derive Chezy’s equation for open channel flow. Water is flowing a critical depth of a section in a triangle shaped channel with side slope of 0.5H:1V as shown in the figure. If the critical depth is 1.6m., estimate the discharge in the channel and specific energy at the critical depth. (5) (5) 3.0m Q7 Describe the principal forces which act on a graving dock. Explain the basic information needed for designing of a breakwater? Q8 a) b) c) d) Write short answer on any TWO: Risk, reliability and safety factor Instantaneous unit hydrograph Gradual varied flow Evaporimeter (10) (5 x 2)

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