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I I I I I I I I I I I I I I I I I I I Flood Hazard Page three FLOOD HAZARDS Field Visit On December' 11, 1986, a representative of the CWCB s~aff met with Mr. Kirvelevicius to discuss the problem. In addition. the CWCB met separately with Mr. Jerome Forte, City Engineer for Woodland Park to discuss the situation. As a result of these meetings, copies of several engineering drainage reports and maps. prepared by the developer and required by the City, were obtained. It became clear that city officials felt they had made a good-faith effort to deal with the situation while Mr. Kirvelevicius felt no meaningful effort had been made. A visit to the area around the sUbject home indicated that the topography downstream of Kelley Road had not been significantly altered by historic or current land development. The basic topography shows several poorly defined drainage channels coming together to form better defined channels approximately 800 - 1000 feet downstream of Kelley Road. There is one main flow path, but it is more of a broad swale than a well defined channel. The most recent topographic mapping of the area was prepared for the City of Woodland Park in January 1986, at a scale of 1" = 200' and a contour interval of 5'. Based on the CWCB field visit and this map, Mr. Kirvelevicius' home is partly in the swale as shown in Figure 1. In his letter to Governor Lamm, Mr. Kirvelevicius stated "It is true in a minor way, we live in a flood plain... " Figure 2 is a copy of a portion of the Preliminary Flood Insurance Study for Woodland Park. It shows the loo-year floodplain on Paint Pony Gulch from Kelley Road downstream and appears to show part or all of the subject property to be in the floodplain. The question is, therefore. how have changes to the basin subsequent to the construction of the home impacted the floodplain? In other words, has the flooding potential increased to the detriment of Mr. Kirvelevicius and his neighbors, or has it decreased? These impacts can be evaluated by studying the effect of several land use changes on the hydrology of the basin. These changes include: Kelley Road, upstream development including a detention pond, and siltation due to upstream erosion. Before the changes are discussed, the general hydrology of Paint Pony Gulch will be described.