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Storm drainage network Design

Hi,

i am working on a model for a small neighbourhood 

after i have input all the data ( elevations, catchments area , Tc, ... )

we are trying to imploy SCS curve method.

but when i have chosen the implicit engine it shows that the only engine that make sizing and design for invert levels is the rational engine.

is it true that i have to use Rational method only for pipe sizing and invert level desin?

Regards