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Estimating Sanitary CSO Overflow events?

I am in the process of developing a CSO model for a small client with 6 sanitary overflows. The state regulatory agency is looking for us to demonstrate the treatment plant flow vs the combined sewer overflows. We have modeled the main interceptor and overflows, and have placed five catchments, as on overflow does not have a catchment. We are looking to use the SCS unit hydrograph method and run a data file with known flow depths from the operator, ie 0.30", 1.25", etc. We have used the time-depth event, but it places the rainfall over 24 hours. We feel this is underestimating the small storms (we see no runoff from the catchments until around 0.7" runoff) and we think the model is over estimating the storms at the higher end (3.3" storm produced several million gallons of overflow and surcharge almost 80% of the manholes) this does not occur in real life.  Any information is there is a better way to model the rainfall and would anyone have a good xml rainfall table for the year they could share. Thanks.