How to Calculate Flood Levels & Depths
Having determined the geodetic ground elevation, flood levels and depths can be calculated as follows.
- Scale the distance from the desired location
to the upstream flood level isogram (x).
- Scale the distance between the flood level isograms
located upstream and downstream of the desired location (y).
- Subtract the downstream flood level from the upstream level (z).
- Calculate the flood level.
Flood Level = Upstream Flood Level - {(x/y)z}
- Calculate flood depth
Flood Depth = Flood Level - Ground Elevation*
*Determined by ground survey
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