B.TECH - Semester 5 water resources engineering Question Paper 2021 (mar)
Practice authentic previous year university questions for better exam preparation.
- (a) In a catchment area the average annual precipitation observed at five raingauge stations are $750,1000,900,650$ and 500 mm . What is the percentage accuracy of existing network? Find the number of additional raingauge stations required if the permissible error is 10\%.
- (b) Differentiate rainfall mass curve and hyetograph. How will you prepare hyetograph from mass curve? OR
- (a) Explain rational method of runoff computation. State its limitations.
- (b) Ordinates of a 2 hr UH of a catchment is given. Derive 6 hr UH hydrograph of the catchment | Time (hr) | 0 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | | :--- | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | :---: | | Discharge (cumec) | 0 | 25 |...
- (a) The CCA for a distributary is 15000 ha. The intensity of irrigation for Rabi is $40 \%$ and for Kharif is $15 \%$. If the total water requirement of the two crops are 37.5 cm and 120 cm and their periods of growth are 160 days and 140 days respectively, determine the duty for each case and the d...
- (b) Give the typical cross section of an unlined canal partially in cutting and partially in filling. Write a note on balancing depth.
- (a) State the limitations of Kennedy's theory. 5
- (b) Obtain an expression for Lacey's regime scour depth.
- (c) Design an irrigation canal for the following data : Discharge $=20$ cumec; Lacey's slit factor $=1$.
- (a) A well of 30 cm diameter fully penetrates a confined aquifer of thickness 15 m . When pumped at a steady rate of 30 lps , the drawdowns observed in wells at radial distances of 10 m and 40 m are 1.5 m and 1 m respectively. Compute the radius of influence, the permeability of aquifer, transmissib...
- (b) Define
- (i) Storativity (ii) Transmissibility.
- (a) Explain how will you find the yield of an open well? 10
- (b) Explain the features of any two types of tube wells with sketches. Module - IV
- Explain in detail the different types of river training works with sketches. ..... 20 OR
- (a) Explain reservoir sedimentation and its control. ..... 10
- (b) Write down the procedure of estimation of useful life of reservoirs. ..... 10 $$ \text { ( } 4 \times 20=80 \text { Marks) } $$
- Enlist the factors to be considered in alignment of irrigation canals.
- State Darcy's law and comment on its validity.
- Explain the phenomenon of meandering of alluvial rivers. ( $5 \times 4=20$ Marks) PART - B Answer one questions from each Module carries 20 marks. Module - I
- Explain different forms of precipitation.
- Write a note on irrigation efficiencies.
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