STUPIDSID
Answer any one question from Q1 and Q2
1
Explain water budget method of estimating evaporation from lake.
6 M
2
Explain isohyetal method of computing mean precipitation over area.
6 M
Answer any one question from Q3 and Q4
3
A minor commands 420 hectares of irrigable area. It is proposed to take wheat crop on whole of the area. The kor period for the wheat is considered to be 3 weeks. The kor depth has been assessed to be 10 cm. In this period 2.75 cm of rainfall is normally expected with such an intensity that 50% of this could be taken as superfluous. Considering 10% conveyance loss find out (i) duty of the canal water at the field head, (ii) head discharge of the minor.
6 M
4
Define:
i) cumec day,
ii) hectare meter,
iii) duty,
iv) delta,
v) base period,
vi) kor depth.
i) cumec day,
ii) hectare meter,
iii) duty,
iv) delta,
v) base period,
vi) kor depth.
6 M
Answer any one question from Q5 and Q6
5
The discharge from a fully penetrating well operating under steady state in a confined aquifer of 35 m thickness is 2000 lpm. Values of drawdown at two observation wells 12 and 120 m away from the well are 3.0 and 0.30 m, respectively. Determine permeability of aquifer.
8 M
6
Develop the equation relating the steady state discharge from a well in an unconfined aquifer and depths of water table at two known positions from the well. State clearly all the assumptions involved.
8 M
Answer any one question from Q7 and Q8
7 (a)
Explain Gumble? extreme value distribution method.
8 M
7 (b)
The ordinates of a 6-h unit hydrograph are given below:
If two storms, each of 1- cm rainfall excess and 6-h duration occur in succession, calculate the resulting hydrograph of flow. Assume base flow to be uniform at 10 m3/s.
If two storms, each of 1- cm rainfall excess and 6-h duration occur in succession, calculate the resulting hydrograph of flow. Assume base flow to be uniform at 10 m3/s.
| Time (h) | Ordinate of 6-h UH (m3/s) |
| 0 | 0 |
| 6 | 20 |
| 12 | 60 |
| 18 | 150 |
| 24 | 120 |
| 30 | 90 |
| 36 | 66 |
| 42 | 50 |
| 48 | 32 |
| 54 | 20 |
| 60 | 10 |
| 66 | 0 |
9 M
8 (a)
State various formulae to estimate flood and explain any two methods.
8 M
8 (b)
The S-curve ordinates of intensity 1 cm/hr derived from 6-hr 1 cm unit hydrograph (UH) are given below. Derive a UH of 3-hr duration and 1 cm depth.
| Time (hr) | S-curve hydrograph ordinates (m3/s) | Time (hr) | S-curve hydrograph ordinates (m3/s) |
| 0 | 0 | 30 | 82800 |
| 3 | 1200 | 33 | 88200 |
| 6 | 3000 | 36 | 91800 |
| 9 | 7200 | 39 | 94200 |
| 12 | 12600 | 42 | 95400 |
| 15 | 21600 | 45 | 96600 |
| 18 | 33600 | 48 | 97200 |
| 21 | 47400 | 51 | 97380 |
| 24 | 62400 | 54 | 97500 |
| 27 | 74400 | 57 | 97500 |
9 M
Answer any one question from Q9 and Q10
9 (a)
A reservoir has a capacity of 50 Mm3 and average annual inflow of 75 Mm3. Area of the
catchment is 1000 km2. Sediment yield and the in-place specific weight of the sediments are estimated at 550 tons per km2 and 1375 kg/m3, respectively. Using three increments, calculate how long will it take for the reservoir to become 60% filled with sediment. The trap efficiency may be approximated by \[ Y=100 \left ( 1- \dfrac {1}{65X+1} \right ) ^2 \] where Y is trap efficiency in per cent and X is the capacity-inflow ratio.
9 M
9 (b)
Define various levels and storages of reservoir.
4 M
9 (c)
What are the factors affecting the selection of site for reservoir?
4 M
10 (a)
Sketch a typical flow mass curve and explain how it could be for the determination of - i) The minimum storage needed to meet a constant demand,
ii) the maximum constant maintainable demand from a given storage.
ii) the maximum constant maintainable demand from a given storage.
9 M
10 (b)
Write a note on Benefit-Cost studies for reservoir. Explain any two methods.
8 M
Answer any one question from Q11 and Q12
11 (a)
Describe various types of layout of subsurface drains.
6 M
11 (b)
Write a note on warabandi.
4 M
11 (c)
Explain in brief methods of application of water.
6 M
12 (a)
Describe component parts of Lift Irrigation scheme with the help of neat sketch.
8 M
12 (b)
What are co-operative water distribution society? ? State the rules and regulations laid down by these society? for equitable distribution of water to farmers.
8 M
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