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<br />' I. INTRODUCTION <br />This drainage report has been prepared for the gravel products <br />operations being conducted by Goaney b Sons, Inc. of Hayfield, <br />' Colorado. The operations are being performed at the Hayfield No. 1 <br />_ pit, which is located approximately 2.5 miles south of Hayfield on <br />1 C.R. 521 (the Buck Highway). The report has been prepared for the <br />overall drainage for all of the phases and detailed analysis of <br />' Phase I. Included in this report are outlines for the drain- age <br />conditions, peak discharges, hydraulic design considerations, and <br />retention requirements for the project. <br />II. DRAINAGE CONDITIONS <br />Presently, the project site is undergoing gravel extraction and <br />_ processing operations within certain portions of Phase I, while <br />leaving portions of Phase I undisturbed. The activities have <br />produced a gravel products processing area and a pond. It is <br />t intended to complete the construction of a shop area within an area <br />of Phase I which is presently irrigated. The drainage impacts of <br />' this activity have been included in the analysis. Presented in <br />Figure 1 are the various drainage basins and flow patterns of the <br />Phases of the project. <br />In summary, the phases and drainage subbasins are as follows: <br />1 Phases I 6 II - SB-3,4,7 and a portion of SB-5 <br />Phase II (Optional) - SB-6 <br />Phase III - SB-1 <br />' Phase IV - the remainder of SB-5 <br />Subbasin SB-2 was considered as off-site drainage flow and will be <br />discussed in the following section. <br />' III. OFF-SITE DRAINAGE <br />As shown in Figure 1, there are two subbasins that produce drainage <br />flows that can be considered off-site contri- butions to Phase I. <br />These subbasins are SB-1 and SB-2. Flows from SB-1 are considered <br />to flow into the existing pond or into the Los Pinos River. Flows <br />1 , <br />-1- <br />1 <br />