12. Depth-Area-Duration Relationships
Depth-Area-Duration (DAD) relationships are critical in hydrologic analysis to estimate rainfall distribution over varying areas and durations. The chapter covers the concept, importance, characteristics, derivation, factors affecting DAD relationships, and applications in engineering design. It concludes with a discussion on advanced approaches and limitations of DAD curves.
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What we have learnt
- DAD curves express the relationship between depth of precipitation, area, and duration of storm.
- These relationships are essential for hydrologic design and flood estimation.
- The estimation of probable maximum precipitation (PMP) is a key application of DAD analyses.
Key Concepts
- -- DepthAreaDuration (DAD) Relationships
- A systematic method to estimate average rainfall over varying areas and durations from point rainfall measurements.
- -- Isohyetal Method
- A method used to calculate areal average rainfall by drawing lines of equal rainfall over a storm area.
- -- Probable Maximum Precipitation (PMP)
- The maximum rainfall that is considered possible in a given area within a specified duration.
- -- Empirical Formulation
- Equations that describe DAD relationships based on historical storm data and rainfall patterns.
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