CUHP 2005

The Colorado Urban Hydrograph Procedure (CUHP) is an evolution of the Snyder unit hydrograph. It has been calibrated to the Colorado front range using of data collected by the U.S. Geological Survey beginning in 1969. Data from 30 sites, representing a full range of land uses in the Denver Metro Area, was used to develop empirical relationships between the input hyetograph and observed output flow. Further details on this study can be found in Appendix C. The resulting algorithms, named CUHP, use a concept called effective precipitation that accounts for volume losses, and a unit hydrograph that accounts for flow routing and basin size.