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Reg No.:_ Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
V SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019

Course Code: CE309
Course Name: WATER RESOURCES ENGINEERING

Max. Marks: 100 Duration: 3 Hours
Graph sheets may be provided
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Describe the Non recording rain gauge with a neat sketch (6)

b) Determine the mean precipitation for the rectangular area given below by (5)
Thiessen Polygon method. Precipitation recorded at rain gauge stations A, B, C
and D are 15 cm, 10 cm, 12 cm and 16 cm respectively. The distance between the
rain gauge stations A and B is 12 km and that between A and D is 7 km.
A B

D ^
௦) The rate of rainfall for successive one hour periods of a 10 hour storm were (4)
recorded as 4.0, 6.3, 5.2, 7.5, 8.4, 2.3, 5.4, 4.5, 8.5 and 3.6 cm/hr.
Taking value of - index as 6.0 cm/hr, compute i) Total rainfall excess

ii) W- index.

2 a) The ordinates of a 4 hour unit hydrograph of a catchment area are given below. (6)
Time 0 4 5 12 [16 [20 [24 [28 [32
in hr

Ordinates

m?/s

Find the ordinates of an 8 hour unit hydrograph for the same basin. Also sketch
the hydrograph.

b) Determine the total infiltration depth for a storm lasting for 5 hours , if the initial (5)
infiltration rate is 12 mm/hr, final infiltration rate is 8 mm/hr and constant value

describing the rate of decay of the difference between initial and final infiltration

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