This post may be missplaced but did not see section for SSA.

I am attempting to compare results from Storm & Sewer Analysis (SSA) to our current analysis through excel. Just setup basic network and just looking at flow from first subbasic (0.5 ac, c=0.9). The results are close but off by a factor of 1.33. This value is an adjustment factor (K of Q=CiA*K) from local juristiction to account for mean seasonal precipitation for different parts of county (30 inches/yr K=1, 40 in/yr K=1.33). I attempted putting this value in under "Rational Method ascending/descending limb multiplier" (Input>Project Options) to no avail. Same results seen with changes in this multiplier. Any ideas on how to address this issue would be much appreciated. Thanks