Civil Engineering MCQAE Level Civil Engineering
The design flood used for spillway capacity of a major dam is generally:
Irrigation EngineeringSpillway Design FloodMEDIUM
Choose the correct answer
A
Mean annual flood
B
50-year return period flood
C
Standard Project Flood (SPF) or Probable Maximum Flood (PMF) based on dam hazard potential
D
10-year return period flood
Correct Answer
C. Standard Project Flood (SPF) or Probable Maximum Flood (PMF) based on dam hazard potential
Why is this the answer?
IS 11223 and CWC guidelines: Spillway design flood for small dams (low hazard) = 100-year flood; medium dams = SPF (Standard Project Flood, approximately 40-50% of PMF); large dams/high hazard = PMF (Probable Maximum Flood). PMF uses the Probable Maximum Precipitation (PMP).
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