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INTRODUCTION <br />The proposed Town of Gypsum Compost Processing Facility is located north of the <br />town and within the patented portion of the American Gypsum Mine, as shown on the <br />Project Location Map in Figure 1. The applicant is proposing to install equipment and <br />provide storage areas on the site in order to process materials from the Town's <br />wastewater treatment plant into salable compost. <br />MAJOR BASINS: <br />The property is not affected by any 100 year floodplain established by FEMA. <br />OFFSITE DRAINAGE BASINS <br />Since the site is situated essentially on a ridge, no offsite drainage basins affect the <br />processing area. The drainage from the small area adjacent to the north will be diverted <br />away from the site before it can affect the site. <br />HYDROLOGY <br />The hydrologic methods for the minor basins in this study are as outlined in the Soil <br />Conservation Service publication "Procedures for Determining Peak Flows in Colorado" <br />(1980). Peak flows in this area will be primarily rainfall derived since the whole site as <br />well as most of the offsite basin are below 8000 feet in elevation. Therefore, the storm <br />drainage system will be more than adequate to handle spring snowmelt runoff, as it <br />typically has much lower peaks, even though of longer duration. The precipitation <br />amounts for the 25 and 100 year, 24 hour storms were taken from the NOAH Atlas 2, <br />Volume 4, published by the National Weather Bureau (see Figures 5 & 6). Runoff <br />calculations for the on-site basin are included in the Appendix, and a summary table of <br />the results is provided at the end of this text. <br />