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GATE 2020 CE (CE2) – Question 24

Hydrology · Streamflow measurements, unit hydrographs, hydrograph analysis · 1 mark · Multiple choice

A triangular direct-runoff hydrograph has time base 90 hours and peak 60 m³/s at 20 hours after storm start. Catchment area is 300 km². Find rainfall excess (cm).

  1. 2.00
  2. 3.24
  3. 5.40
  4. 6.48

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Correct answer: (B) 3.24

Explanation

Runoff volume is triangular hydrograph area $90(3600)(60)/2=9720000$ m³. Divide by catchment area $300\times10^6$ m² to obtain 0.0324 m, or **3.24 cm, B**.