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e e e STORMWATER AND FLOODPLAIN MANAGEMENT IN MOUNTAIN COMMUNITIES 1998 CAS FM Conference, September 30 - October 2, 1998 TECHNICAL SESSION DESCRIPTION This session was put together in response to requests from some of your fellow mountain stormwater and floodplain managers. This will be a session to explore technical questions regarding precipitation, runoff, general hydrology and hydraulics in the mountains, as well as administrative procedures for addressing storm drainage and flooding in Colorado's hi!;!h country. Some of the questions that have been asked are: . How should flood flows be calculated for ungaged streams in mountain communitie!s? What about snowmelt versus rainfall events? What are appropriate rainfall values for hydrologic computations? How might snowmelt peak flow values be predicted? Can hydrologic homogeneity (or the lack of it) be defined from one part of Colorado's high country to another? What shoulld be the basic performance criteria for storrnwater facilities (Le. 5-, 10-, 25-, or 1 DO-year, "it depends") and how much flexibility should there be in implementation of those criteria? . . . . . A panel of four consultants, all of whom either have prior experience or current experience in mountain drainage engineering, has been assembled. They will be prepared to share their experience, their questions, and, as appropriate, answers they have arrived at. The session will be an interactive discussion and not a lecture. They are trying to help the affelcted communities, the interested private practitioners and the Colorado Water Conservation Board start the process of developing appropriate procedures and standards for stormwater and floodplain design and regulation in the mountains. We hope thi:s session is the start of an ongoing process.