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consulted 10 obtain the best soils information available for the Cripple Creek area. That consultation indicated that soils from the following SCS series are present in the watersheds: impervious area. This data, when coordinated with soil and vegetative cover types, provides dcsign information for storm water runoff calculations. Hoddel Hodden Raleigh Rogert Guffey Thc City of Cripple Creek was originally developed a5 a commercial and residential area for persons attracted 10 the area by mining activities. There have bcen no significant industrial aetivilies conducted within the city Jimits t hroughout the city's history. At the present time, the city consists of a business district, now referred 10 a5 a business and historical zone, generally bounded by Meyers and Carr Avenues on the south and nonh respectively and by B Street and 5th Street (Colorado Highway 67) on the west and east respectively. The other areas of the city, panicularly those areas lying north of Carr Avenue, are residential. At the present time, there are very few multi-family housing units in tbe area, the majority of the housing units are single family detached structures. The City of Cripple Creek has most recently taken an aggressive approach to zoning within the city so as to maintain the character and integrity of residential areas. The city has established well defined land use ordioances whieh govern development within the city limiL~. ItishighlyunlikelythatanysignificantchangelOthelanduseasnow exists, with the exeeptionofdensities. in the commercial and residential zones wi1l be affected inthe future. The city continues to express a very strong desire to maintain its historical characteristics. Any significant change in the land use characteristics would viol ate those intentions. SCS soil classifications are related to hydrologic groups designated A to 0 with the higher letter indicating a more impervious soil which results in greater runoff generation. The soils in the above series are comp(lsed primarily of soils in hydrologic soil groups Cand 0, therefore, runoff coefficients related to hydrologic soil groups C and D were used throughout the watersheds when determining design runoff. Vegetation in the study area ranges from natural grasses in undeveloped areas to some developed lawn grasses in residential areas. Trees and shrubs are present within lhe study area, but are relatively ,carce. Vegetative cover is relatively sparse because of the thin, rocky topsoil layer. The Pony Gulch and Cripple Creek watersheds contain a significant amount of land with slopes in excess of 20 percent. The steep slopes and impermeable soils found in thc watersheds result in a high runoff potential and make the areas extremely suseeptibleroerosionifthegwnndcoverisdisturbed.Spccialcareshouldbet<iken in development of the steeply sloped areas ot' the watersheds. If these slopes are stripped of vegetation or u,ed as unsupervised fill areas, severe erosion could result. c. Land Use Land use data used in this study was projected for future deveJoped conditions bas cd on research of the city's present zoning ordinances and assodated z oningmap, Ithas heen projected that development of the business and historical zones will he completed at S(}me puint in the near future resulting in very little vacant ground remaining in the zone. Development projections for the residential, commercial and husiness buffer zones were hasedon allowable uses and densities a s described within thezoningonlinances. [Twas projected that most existing strucwres wuuld he Icft undisturhed with infilling occurring on a land availahility hasis. it was alsu projecteu "[1".: aclual JanJ use of an area has a majurt:ffect on the drainage conccrns10 bc encountered. Land use conditions dictate relatiom;hips between pervious and 1II-3 111-4