GATE AG 2019 • Q32 NAT • 1 Mark

Section 4: Soil and Water Conservation Engineering

Hydrology

Subtopic: Drought and its classification

Question Statement:

Hydrology: Hydrological cycle and measurement of its components; meteorological parameters and their measurement; analysis of precipitation data; runoff estimation; hydrograph analysis, unit hydrograph theory and application; stream flow measurement; flood routing, hydrological reservoir and channel routing, Infiltration – indices and equations, drought and its classification. A watershed of area 80 ha has runoff coefficient 0.3. A storm of intensity 5 cm h⁻¹ occurs for a duration more than the time of concentration. The peak discharge in m³ s⁻¹ (rounded to 2 decimals) is ______.

Official Answer Key:

3.30 to 3.35

Step-by-Step Solution & Explanation

Rational method: Q = CiA/36, with i in cm/h, A in ha, Q in m³/s. Q = (0.3 × 5 × 80)/36 = 120/36 = 3.333 ≈ 3.33 m³/s. Answer: within 3.30–3.35.

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