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Gaynor lakes are located about 2 miles south of longmont. Studies Indicate that West Gaynor lake would be adequate in size to store the 500-year storm runoff from the area upstream from the lake. East Gaynor lake has a surface area of approximately 64 acres. Flood control storage was computed to be 180 acre-feet. Flood plain zoning can be an effective method for prevent- ing future flood damages. To date, flood plain zoning in Boulder arid Weld Counties has been instituted where flood plain information is available. Fe~eral Iy-related financial loans for building pur- poses in Identified special flood hazard areas require flood insur- ance on the property. Other factors and their Impacts - Flood damages are also possible In the event of large amounts of runoff from tributaries or small drainageways flowing into Dry Creek. Crops, roads, and farm buildings could receive some damage from these small streams. Although the study area Is relatively free of urban development, the .Dry Creek basin has experienced some residential growth. If this growth continues, flood damages could occur In the event of future flood inn. The flood damage potential In the Dry Creek basin could be reduced by Implementing flood emergency plans and sound flood plain management concepts. Flood warning and forecasting - The National Oceanic and Atmospheric Administration (NOAA), National Weather Service, supplies weather forecasts at least twice daily for the area. Special fore- casts of severe storms, flood warnings, and snowmelt advlsaries of a general nature are also Issued as required. Radar observation of Intense precipitation and projection of storm movement gives some lead time for flash flood warnings; this Information Is promptly disseminated to all news media and local officials by the best com- munications available. 12 Flood fighting and emergency evacuation plans - the Boulder and Weld County Civil Defense Offices coordinate disaster activities with the State Civil Defense Office. They feel that they have adequate organization to meet any emergency. Material storage on the flood plain - Floatable manmade material stored on the flood plain is often washed away during floods with the potential of collecting at points downstream. The flood plain' In the study reach is relatively clear of such mate- rials. When floatable objects are stored on the flood plain, they should be secured In some fashion. Other floatable material, such as trees, branches, brush, and logs, Is in evidence along the stream. This material could form obstructions to floodflows, especially at bridges, in the event of a flood. 13