GATE CE 2025 Set 1 — Question 20

MCQ+1 / -0.33MediumHydrograph AnalysisHydrographs & GroundwaterWater Resources EngineeringUnit Hydrographs

Water Resources Engineering → Hydrographs & Groundwater → Hydrograph Analysis

Last updated 5 September 2026

Question

To derive the total flood hydrograph at a catchment outlet from an isolated storm, the order in which the following methods are applied, from the first method to the last method, is P. Obtaining the hyetograph Q. Addition of baseflow R. Estimation of initial and infiltration losses S. Application of unit hydrograph

Correct answer (A) PRSQ Solution The standard procedure to derive a total flood hydrograph is: 1. P. Obtaining the hyetograph : Start with the rainfall data (intensity vs. time). 2. R. Estimation of initial and infiltration losses : Subtract losses from the hyetograph to obtain the Effective Rainfall Hyetograph (ERH). 3. S. Application of unit hydrograph : Convolve the ERH with the Unit Hydrograph (UH) to get the Direct Runoff Hydrograph (DRH). 4. Q. Addition of baseflow : Add the baseflow to the DRH to obtain the Total Flood Hydrograph. Thus, the correct sequence is P-R-S-Q. Turn this into a strength. Explore AI-powered practice and doubt support with Success Tracker.

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Correct answer (A) PRSQ Solution The standard procedure to derive a total flood hydrograph is: 1. P. Obtaining the hyetograph : Start with the rainfall data (intensity vs. time). 2. R. Estimation of initial and infiltration losses : Subtract losses from the hyetograph to obtain the Effective Rainfall Hyetograph (ERH). 3. S. Application of unit hydrograph : Convolve the ERH with the Unit Hydrograph (UH) to get the Direct Runoff Hydrograph (DRH). 4. Q. Addition of baseflow : Add the baseflow to the DRH to obtain the Total Flood Hydrograph. Thus, the correct sequence is P-R-S-Q.

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