The design flood used for spillway capacity of a major dam is generally:
Choose the correct answer
Mean annual flood
50-year return period flood
Standard Project Flood (SPF) or Probable Maximum Flood (PMF) based on dam hazard potential
10-year return period flood
Correct Answer
C. Standard Project Flood (SPF) or Probable Maximum Flood (PMF) based on dam hazard potential
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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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