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Sixth Semester B.E. Degree Examination, June/Jul~7~Q;(4-'/_:I'Hydraulic Structures and Irrigation Design-~'g

Time: 4 hrs. Max. Marks: 100

Note: 1. Answer TWO full questionsfrom PART-A and ONEfull questionfrom PART-B.2. Assume data suitably ifnot given and mention the same.

PART-Aa. State and explain different types of storage zones with the help of neat sketch. (07 Marks)b. The monthly discharge volumes in million m3 for period of 24 months recorded at stream

gauging site are: 3, 6,16,30,18,15,10,8,6,4,3,1,2,5,17,28,20,15, 12,7,5,4,3 and 2.Determine size of reservoir proposed at the gauging site if it is to maintain an assured supplyof8.33 million m3 .per month. The water year may be taken as~une-May. (08 Marks)

.Jl ••••• ,.~\ Va. Explain different types of forces acting on a gravity dam. :.>b. Briefly explain elementary profile of a gravity dam. «)

(07 Marks)(08 Marks)

a. Explain briefly various causes of failure of earth dam. (06 Marks)b. Draw a neat sketch of earthen dam showing phreatic line with horizontal filter at

downstream. (05 Marks)c. A flow net is to be plotted for a homogeneous earthen dam of height 22 m and free board 2.0

m. The results obtained are:Number of potential drops = 10Number of flow channels = 4

The dam has horizontal filter of 30 m at downs elm end and coefficient of permeability ofdam material is 5 x 10-4 cm/se~. Calculate the discharge per metre run of dam. (04 Marks)

PART-BDesign the surplus work ofa tank forming part ofa chain of tanks.Combined catchment area = 25.89 sq.kmIntercepted catchment area = 20.71 sq.kmMaximum water level = +12.75

"Full taM level = + 12,,()0Ground level at proposed site = + 11.00Ground level below proposed weir upto a reach of 6 m (Fall) = + 10.00Top width oftank bund = 2 mTank bund level (TBL) = +14.50Side slopes ofbund on either side = 2: 1Design saturation gradient with 1 m clear cover = 4: 1Level of hard strata = +9.50Ryve's coefficient for combined catchment = 9Ryve's coefficient for intercepted catchment = 1.5Provision may be made to make Kutcha regulating arrangements to store water upto MWLin times of necessity. (25 Marks)

Draw:i) Halfplan at foundation and half plan at ground level.ii) Draw half longitudinal section and half longitudinal elevation.iii) Cross section across surplus weir.

(20 Marks)(15 Marks)(10 Marks)

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5 Design a canal drop of2 metres with following data:Hydraulic particulars of canal above drop.Full supply discharge = 4 cumecsBed width = 6 mBed level = + 10.00 mFull supply depth = 1.5 mFull supply level (FSL) = + 11.50Top width of bank = 2 mTop bank level (TBL) = + 12.50 mHalf supply depth = 1 m

Hydr Ulic particulars of canal below drop.Full supply, discharge = 4 cumecsBed width / = 6 mBed level = +8.00 mFull supply depth = 1.5 mFull supply level (FSL) = +9.50 mTop width of bank = 2 mTop bank level (TBL) = + 10.50 mGround level at site of work = + 10.50 mGood soil available for foundation is at = +8.50 m,Draw:i) Halfplan at foundation and halfplan at ground level.ii) Longitudinal section.iii) Cross section showing half elevation and half section.

(20 Marks)(15 Marks)(10 Marks)

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