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portions of Colorado. This includes the zone between the Front Range foothills and the plains, where a large portion of Colorado's residents live and work. As a result, our hydrologic estimates for our floodplain studies are less accurate and reliable. RECOMMENDATIONS: Perform an inventory of existing network of stream and precipitation gages in Northeastern and Southeostern Colorado and determine the "holes" in that network; seek local, state and federal funding to install, operate and maintain gages to fill as many of those "holes" as possible; commit, to the extent possible, to a 25-year plan for each gage to assure an adequate period of record. LEAD AGENCIES: CWCB, Urban Drainage and Flood Control District, Colorado Division of Wa- ter Resources, USGS, NWS FUNDING: USGS, CWCB SCHEDULE: One year ISSUE: CS-4 Rainfall-runoff modeling research BACKGROUND: Many flood hydrology analyses in Colorodo have been performed using rain- fall-runoff modeling. That means the hydrologist used theoretical or octually measured rainfall data and translated that rainfall mathematically into flow on the stream system receiving the rainfall. Generally, stream gaging information was not available to verify that the flows computed through the mathematical model correspond to physical reality on that stream system. RECOMMENDATIONS: Seek funding [local, state, federal and private) to support rainfall-runoff model- ing research at one or more universities and/or colleges in Northeastern Colo- rado; inventory the rainfall-runoff methodologies currently in use by hydrolo- gists performing floodplain studies in Northeastern Colorado; conduct studies over a period of years to verify and/or modify the relationship between a given rainfall in a particular watershed and a specific flow at vorious locations on the stream system draining that watershed; develop one or more new rainfall-runoff models and calibrate the new model[s} to actual field data for the region of interest. , I