HEC-HMS Tutorials and Guides Current: Estimating Clark Unit Hydrograph Parameters PDF Download PDF Download page Estimating Clark Unit Hydrograph Parameters. Current page Include child pages All pages Estimating Clark Unit Hydrograph Parameters Introduction to Computing Clark Unit Hydrograph Parameters Estimating Time of Concentration & Storage Coefficient — This tutorial demonstrates how to estimate Clark's storage coefficient (R) for three subbasins. Time of Concentration and Storage Coefficient Impacts to the Hydrograph — This tutorial evaluates impacts of Clark unit hydrograph parameters on the hydrograph response. PageLast Update ×