GATE Questions & Answers of hydrograph analysis

What is the Weightage of hydrograph analysis in GATE Exam?

Total 3 Questions have been asked from hydrograph analysis topic of Hydrology subject in previous GATE papers. Average marks 1.67.

The direct runoff hydrograph in response to 5 cm rainfall excess in a catchment is shown in the figure. The area of the catchment (expressed in hectares) is _________.

The ordinates of a one-hour unit hydrograph at sixty minute interval are 0, 3, 12, 8, 6, 3 and 0 m3/s. A two-hour storm of 4 cm excess rainfall occurred in the basin from 10 AM. Considering constant base flow of 20 m3/s, the flow of the river (expressed in m3/s) at 1 PM is _________

The 4-hr unit hydrograph for a catchment is given in the table below. What would be the maximum ordinate of the S-curve (in m3/s) derived from this hydrograph ?

Time (hr) 0 2 4 6 8 10 12 14 16 18 20 22 24
Unit hydrograph
ordinate (m3/s)
0 0.6 3.1 10 13 9 5 2 0.7 0.3 0.2 0.1 0