2009-10-16_PERMIT FILE - M2009082 (13)

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Storm water drains from northwest to southeast as overland flow and returns to the Cache la Poudre River as such. The subbasin has historically been used as cropland and contains two farmsteads. Subbasin H2 contains approximately 159 acres. The boundary begins at the culvert under WCR 25 and follows the slough along its southern extent to the boundary with Subbasin H1. The centerline of WCR 25 forms the eastern boundary and the Whitney Ditch forms the northern boundary. The subbasin is generally located in the Southeast One-Quarter of Section 25. The slope is generally between 0.5 percent and 4.0 percent with a subbasin average of 1.2 percent. Storm water drains from north to south and is collected in a slough on the southern subbasin boundary. The water is then conveyed to the Cache la Poudre River via a deep cut channel after passing through a 30 inch culvert under WCR 25. Subbasin H3 contains approximately 196 acres. The boundary extends from the south bank of the Cache la Poudre River in the southwest corner of the property south along an ancient meander of the Cache la Poudre River up a prominent ridge out of the floodplain, then west along the rim of the floodplain, turning back north into the floodplain to make its way back to the point where the property intersects the Cache la Poudre River. The subbasin is generally located in the East One- Half of the Southwest One-Quarter and the West One-Half of the Southeast One-Quarter of Section 36 and the Northwest One-Quarter of the Northeast On-Quarter of Section 1. The slope is generally between 0.5 percent and 25.0 percent with a subbasin average of 7.8 percent. Storm water drains from south to north and is collected in a series of gullies that open up to either overland flow within the flood plain or to the ancient meander of the river and returned to the Cache la Poudre River. Subbasin H4 contains approximately 97 acres. The Cache la Poudre River bike trail forms the northern boundary of the subbasin except for a small area along WCR 25 where the basin crosses the bike trail to return to the Cache la Poudre River. From the bike trail, the basin follows the ancient meander bounding Subbasin H3 to the rim of the floodplain then turns east to the next prominent ridge where it courses northeast to WCR 25. The subbasin is generally located in the East One-Half of the Southeast One-Quarter of Section 36 and the Northeast One-Quarter of the Northeast One-Quarter of Section 1. The slope is generally between 0.5 percent and 20.0 percent with a subbasin average of 5.0 percent. Storm water drains from south to north and is collected in a series of gullies that open up to overland flow within the flood plain and returned to the Cache la Poudre River near the intersection of WCR 25 and the Cache la Poudre River. Subbasin H5 contains approximately 28 acres. The ancient river meander, the Cache la Poudre River, and the Cache la Poudre River bike trail form the boundaries of this subbasin. The subbasin is generally located in the South One-Half of the Northeast One-Quarter of Section 36. The slope is generally less than 0.1 percent with a subbasin average of 0.07 percent. Storm water drains from southwest to northeast as overland flow and returned to the Cache la Poudre River as such. Subbasin H6 contains approximately 57 acres. The boundary begins at the intersection of WCR 25 and the Cache la Poudre River courses west along the north bank of the river to the intersection with the divide between Subbasins H1 and H6, then north to the slough in Subbasin H2, then east to the centerline of WCR 25 which forms the eastern boundary. The subbasin is generally located in the East One-Half of the Northeast One-Quarter of Section 36. The slope is generally between 0.2 percent and 1.5 percent with a subbasin average of 0.5 percent. Storm water drains from west to -3- Rcvis d PmGminary D2inagc Rcport.docx