Section 4: Soil and Water Conservation Engineering
Hydrology
Subtopic: Flood routing, hydrological reservoir and channel routing
Question Statement:
The hydrologic reservoir routing methods use
Options:
(A) Bernoulli's equation only
(B) hydrologic continuity equation only
(C) Muskingum equation only
(D) both the hydraulic momentum and hydrologic continuity equations
Official Answer Key:
B
Step-by-Step Solution & Explanation
Hydrologic (storage-indication) reservoir routing relies solely on the continuity (mass-balance) equation, Inflow − Outflow = dS/dt, together with a storage-elevation-discharge relationship — it does NOT invoke the momentum equation (that distinguishes it from hydraulic routing methods). Hence (B). The Muskingum method (C) is a hydrologic CHANNEL routing method, not reservoir routing, so it is not the general answer here.
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