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Hydrology & Irrigation (October 2010)

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Total No. of Questions : 12] [Total No. of Pages : 4 P1019 [3864]-101 B.E. (Civil) HYDROLOGY AND IRRIGATION (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) Differentiate between : [8] i) Tropical cyclone and extratropical cyclone. ii) Convectic precipitation and orographic precipitation. A rainfall of depth of 300 mm had a return period of 50 years. Determine the probability of a one day rainfall having depth equal to or greater than 300 mm occuring. [8] i) Once in 25 successive years. ii) Two times in 10 successive years. iii) At least once in 15 successive years. OR Q2) a) Differentiate between : i) Symon s raingauge and weighing bucket raingauge. ii) Mass curve of rainfall and Hyetograph. [8] P.T.O. b) The isohyets due to a storm were having following details : Isohyets (mm) Area (km2) 150 40 170-150 150 150-140 70 140-130 200 130-110 25 Find the weighted precipitation for the total catchment area. [8] Q3) a) What are 3 analytical methods of evaporation estimation? Explain any one of them. [8] b) State any 3 methods of reducing evaporation and explain any one of them. [8] OR Q4) a) b) Q5) a) b) Explain how evapotranspiration is measured with help of : i) Lysimeters ii) Field plot method. Differentiate between transpiration and evapotranspiration. [8] [8] Give analogy for infiltration with help of sketch and thereby differentiate between infiltration capacity and field capacity. [8] Define unit hydrograph. State factors affecting the unit hydrograph. Explain the components of unit hydrograph with help of sketch. [10] OR Q6) a) b) State any 3 direct methods of measuring stream flow. Explain any one of them. [8] The peak of a flood hydrograph due to a 5 Hours effective storm is 300 m3/sec. The mean depth of rainfall is 6 cm. Assuming an average infiltration loss of 0.2 cm/hr. and a constant base flow of 25 m3/sec, estimate the peak of 5 Hours unit hydrograph. [10] [3864]-101 2 SECTION - II Q7) a) Explain the terms - Delta and Base period. A crop of wheat requires about 75 mm of water after every 32 days. If the base period for wheat is 160 days, determine delta for wheat. [8] b) Derive the relation between duty and delta. If delta is 100 cm for a crop having base period 45 days, find its duty. [8] OR Q8) a) Estimate the number of days required between two waterings for a crop having following specifications : [8] i) Field capacity of soil = 30% ii) Permanant wilting point = 15% iii) Apparent density of soil = 1.5 iv) Effective depth of root zone = 755.55 mm v) b) Q9) a) Daily consumptive use of water for crop = 10 mm. What do you mean by crop rotation? What are its advantages? State the period of kharif, rabi and hot weather season. Name the crops which are grown in rotation. [8] Differentiate between : [8] i) ii) b) Unconfined aquifer and perched aquifer. Coefficient of transmissibility and hydraulic conductivity. A 30 cm diameter well is pumped at a uniform rate of 3 m3/min in a 30 m thick aquifer. Drawdown observations taken at 2m and 200 m distance from centre of well are 10m and 0.5m respectively. Determine aquifer constant of water bearing stratum. [8] OR Q10)a) b) Draw a layout of lift irrigation scheme. Show all the components and state their functions. [8] State assumptions in Dupuit s theory. [3864]-101 3 [8] Q11)a) b) Differentiate between - Drip irrigation and sprinkelar irrigation. [8] What are drains? What are advantages of drains? State different types of drains. [10] OR Q12)Write short notes (any - 3) : [18] a) Global water partnership. b) Salient features of National Water Policy. c) Different irrigation acts and their features. d) G.I.S. and R.S. in crop area assessment. e) Participatory irrigation management. vvvv [3864]-101 4

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Additional Info : 2003 Course
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