Product(s):	SewerGEMS, StormCAD, CivilStorm, PondPack
Version(s):	08.11.XX.XX 10.00.XX.XX
Area:	Layout and Data Input

Problem

Why don't the IDF equation coefficients match?

What happened to the E, B, D coefficient IDF curve type?

IDF curve equation coefficients E, B, and D are now labeled A, B, and N.

[Problem ID#: 39295]

Solution

The naming of the coefficients in the IDF curve equation format has changed in V8i.

Mapping for the new naming convention is as follows:

e -> n

b -> a

d -> b

Other sources may use different characters for the IDF equations.

Coefficients that are in the same place, in a matching equation, can be considered equivalent.