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Hydrology & Irrigation (October 2009)

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Total No. of Questions : 12] [Total No. of Pages : 3 [3664] - 101 P 928 B.E. (Civil) HYDROLOGY AND IRRIGATION (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any 3 questions from each section. 2) Answers to the two sections should be written in separate answer books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) b) In a catchment area of 100 km2, the average annual precipitation at five rain gauge stations is as under Station 1 2 3 4 5 Precipitation (mm) 750 1000 900 650 500 Find number of additional rain gauge stations if permissible error is 10%. Also, find rain gauge density. [8] What is Probable Maximum Precipitation (PMP)? Explain how it is estimated? [8] OR Q2) a) b) Explain with graph the Intensity - Duration - Frequency relationship. [8] Describe Radar measurement of rainfall. Also, state names of any four methods of measurement of rainfall. [8] Q3) a) Differentiate between evaporation and evapotranspiration. Also, state Dalton s equation & explain different terms of it. [8] The average precipitation during a storm over a catchment area of 10 km2 is as follows. i) 40 mm/hr for 1 hour. ii) 60 mm/hr for 1 hour. iii) 30 mm/hr for 1 hour. If the area of hydrograph plotted with scale 1 cm = 1 hr on x axis and 1 cm = 10 m3/sec on y axis observed as 30 cm2, find index of infiltration. [8] b) P.T.O. OR Q4) a) b) Q5) a) b) Explain the current meter method of determining the discharge flowing through open channel. Also, state the equation of current meter. [8] 3 The annual yield in mm from a catchment for 20 years is 240, 350, 680, 400, 290, 160, 110, 105, 300, 600, 800, 540, 280, 130, 320, 810, 740, 220, 190 and 480. Find i) 80% dependable yield. ii) % dependibility of the yield of 540 mm3. Also, plot the flow duration curve. [8] Define unit hydrograph. State any four assumptions in deriving unit hydrograph. Also, explain base flow separation with help of sketch. [8] The ordinates of 6 hour hydrograph are Time (Hr) 0 6 12 18 24 30 36 42 48 54 60 66 3 Q (m /sec) 0 20 50 150 120 90 70 50 30 20 10 0 If two storms, each of unit rainfall excess in 6 Hr. duration reach the catchment in succession, derive the hydrograph resulting from these two storms. The stream may be assumed to have a uniform base flow. [10] OR Q6) a) b) A catchment area of 80km2 receives maximum precipitation of 4 cm/hr. Find maximum flood discharge by using i) Dicken s formula (C = 22) ii) Inglis formula. iii) Ali Nawaz Jung Bahadur formula (C = 50) & iv) Rational formula (C = 0.35). [8] Explain concept of synthetic hydrograph and state step by step procedure of Snyder s study. [10] SECTION - II Q7) a) Find duration in days between two waterings if i) Field capacity of soil = 30%. ii) Apparent density of soil = 1.5. iii) Permanent willting point = 15%. iv) Effect depth of root zone = 75 cm. v) Daily consumptive use of water for the crop = 10 mm. [3664] - 101 -2- [8] b) State salient features of national water policy. [8] OR Q8) a) b) Q9) a) b) Define Duty . State any six factors affecting duty. Also state any four methods to improve duty. [8] Determine the capacity of a reservoir if its culturable area is 1,00,000 ha. Following are details of crop pattern. Crop Base Period Duty Irrigation Intensity (Days) (ha/cumec) (%) Sugarcane 330 2500 40 Wheat 120 1500 20 Rice 120 1000 10 Assume reservoir losses as 10% and canal losses as 5%. [8] State any two classifications of land drainage system and explain design aspects of tile drain. [8] State concept of Participatory Irrigation Management (P.I.M.). Explain [8] role of water users cooperative societies in P.L.M. OR Q10)a) b) Explain concept and functioning of Globle Water Partnership. Compare lift irrigation system with canal irrigation system. Q11)Write short notes on a) Application of Remote Sensing in reservoir sedimentation. b) Use of G.I.S. in crop pattern. c) Warabandi. [8] [8] [18] OR Q12)a) b) State Dupuit s assumptions and derive the equation for discharge from unconfined acquifer under steady state conditions. [8] What are different irrigation acts? State the main features of Maharashtra Water Resources Controlling Authority Act 2005. [10] [3664] - 101 -3-

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