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The design of Buckskin Ditch, the other main tributary to Streeter Gulch Ditch was previously <br />discussed separately in Exh. 7-14M. However, because Buckskin Ditch contributes to the design <br />flow for Streeter Gulch Ditch, it is included here in the SEDCAD model for Streeter Gulch <br />Ditch. Buckskin Ditch is designed as a vegetated channel for the 10 year 24 hr storm runoff <br />from its 131.44 acre watershed. <br />The following pages present the SEDCAD model output for Streeter Gulch Ditch, including its <br />tributaries Southeast Tributary to Streeter Gulch, Southwest Tributary to Streeter Gulch, and <br />Buckskin Ditch. Channel parameters and calculated flows are also presented in the summary <br />table in Exhibit 7, Item 14, Table 1. <br />The following Items accompany this submittal: <br />• Exh. 7-14E l through 4 <br />• Exh. 7-14E, Figure 1, Drainage Area, page Exh. 7-14E-5 <br />• Exh. 7-14E, Figure 2, Subwatersheds, page Exh. 7-14E-6 <br />• SEDCAD models for PMT surface, 100 year -24 hour storm, pages Exh. 7-14E-7 to 37. <br />ENGINEERING CERTIFICATION <br />I am a Licensed Professional Engineer in the State of Colorado and a representative of <br />Environmental Solutions, Inc., P. O. Box 2996, Cheyenne Wyoming. The information contained <br />in this document was provided by Colowyo Coal Company. Being familiar with the Colowyo <br />operation and the coal permitting process in Colorado, the information contained herein is <br />reasonable and correct to the best of my experience. <br />.E. No. 32257 <br />Exh. 7-14E-3 Revision Date. 09101/15 <br />Revision No.: TR -105 <br />