JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II HYDROLOGY Previous Question Paper (December - 2017 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Define two important forms of precipitation.
Answer
Two important forms of precipitation are Rain, which is liquid water droplets with diameters greater than 0.5 mm, and Snow, which consists of ice crystals formed by the sublimation of water vapor at temperatures below freezing.
What is meant by Probable Maximum Precipitation? List the methods of estimating PMP.
Answer
Probable Maximum Precipitation (PMP) is the theoretically greatest depth of precipitation for a given duration that is physically possible over a given size storm area at a particular geographical location at a certain time of the year. Methods for estimating PMP include: 1) Meteorological method (storm transposition and moisture maximization), 2) Statistical method (Hershfield's technique), and 3) Generalized charts.
State the difference between φ index and W index.
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Why rainfall-runoff relation is necessary? Justify.
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List the factors affecting runoff.
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Differentiate between vertical axis and horizontal axis meters.
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List the meteorological factors that influence the hydrograph shape.
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Define (i) Base flow (ii) Direct runoff.
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List the application of S-curve.
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What is hydraulic stage routing?
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Part B
Explain how the double mass curve is used to test the consistency of rainfall record.
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How do you estimate the average depth of precipitation by Thiessen polygon method?
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What is Rain gauge? Explain with neat sketch, working principle of Symon’s non recording gauge. Give its merits and demerits.
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Rainfall of magnitude 3.8 cm and 2.8 cm occurring on two consecutive 4-h durations on a catchment area 27 km2 produced the following hydrograph of flow at the outlet of the catchment. Estimate the rainfall excess and φ-index.
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Describe the runoff characteristics of streams.
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Define overland flow and interflows.
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What is an automatic stage recorder? Explain its principle of working. Describe the salient features of a shelter for an automatic stage recorder with neat sketch.
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The stage in the river is recorded as 40.5 m at 8:00 A.M. and it is observed to fall by 0.15 m in the next one hour. The stage-discharge relationship for the steady state flow conditions at the gauging site is established as
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Describe any two methods of deriving unit hydrograph from the complex storms.
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The direct runoff hydrograph resulting from a 5.0 cm of effective rainfall of 6 h duration is given below. Determine the area of the catchment and the ordinates of the 6 h unit hydrograph.
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Describe the Modified Pul’s method of reservoir routing.
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Calculate the Snyder’s synthetic unit hydrograph parameters for the following data: Catchment area = 950 Km2; L = 48 km; Lc = 21 km, Ct= 1.65, Cp = 0.57. Adopt standard duration.
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