GATE Questions & Answers of precipitation

What is the Weightage of precipitation in GATE Exam?

Total 4 Questions have been asked from precipitation topic of Hydrology subject in previous GATE papers. Average marks 2.00.

Rainfall depth over a watershed is monitored through six number of well distributed rain gauges. Gauged data are given below
Rain Gauge Number 1 2 3 4 5 6
Rainfall Depth (mm) 470 465 435 525 480 510
Area of Thiessen Polygon ($\style{font-family:'Times New Roman'}\times$104 m2) 95 100 98 80 85 92


The Thiessen mean value (in mm, up to one decimal place) of the rainfall is ______

The total rainfall in a catchment of area 1000 km2 , during a 6 h storm, is 19 cm. The surface runoff due to this storm computed from triangular direct runoff hydrograph is $ 1\times10^8 $m3 . The $ \phi_{index} $ for this storm (in cm/h, up to one decimal place) is ______

A catchment is idealized as a 25km × 25km square. It has five rain gauges, one at each corner and one at the center, as shown in the figure.

During a month , the precipitation at these gauges is measured as G1=300 mm, G2=285 mm, G3=272 mm, G4=290 mm and G5=288 mm. The average precipitation (in mm, up to one decimal place) over the catchment  during this month by using the Thiessen polygon method is _____________

In a catchment, there are four rain – gauge stations, P,Q,R, and S. Normal annual precipitation values at these stations are 780 mm, 850 mm, 920 mm, and 980 mm, respectively. In the year 2013, stations QR, and S, were operative but P was not. Using the normal ratio method, the precipitation at station P for the year 2013 has been estimated as 860 mm. If the observed precipitation at stations Q and R for the year 2013 were 930 mm and 1010 mm, respectively, what was the observed precipitation (in mm) at station S for that year ?