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I I I I I I I I I I I I I I I I I I Culvert Sub-Basins Due to the small size of the sub-basins. discharges to culverts and roadside ditches were calculated utilizing the Rational Method. Roadside ditches and on-site culverts were sized to convey the 10- year event in conformance with Town of Kiowa Criteria. Outlet protection will be required at some culvert outlets to reduce pipe discharges to non-erosive velocities. The final construction plans will detail any outlet protection and roadside ditch protection required. EXISTING AND PROPOSED DRAINAGE CHARACTERISTICS Fawn Valley is bisected by an improved grass-lined swale. RWlofffrom Basin TA-I currently enters this swale by overtopping County Road 45. The proposed installation of (3) 48-inch culverts will convey the 10-year storm under COWlty Road 45 and limit the 100-year overtopping to a I-foot depth. Runoff then continues through the site and exits the site at Ute Avenue by an existing 24-inch culvert with the excess discharge overtopping Ute Avenue. The installation of (3) 48-inch culverts will convey the 10-year storm under Ute Avenue and limit 100-year overtopping to a I-foot maximum depth. Although this project is to be overlot graded, the general historic outfall locations will remain. Off- site Basins OA-I through OA-4 will discharge runoff to on-site Basins A-I through A-12. Sub- basins A-I through A-12 will eventually discharge runoff to the grass-lined channel in Tract A by the on-site drainage system consisting of roadside swales and proposed culverts or as sheet flow directly to the existing channel. Off-site Basins OB-I and OB-2 will discharge runoff to on-site Basins B-1 and B-S. On-site Basins B-1 through B-6 will ultimately discharge to the existing 24-inch culvert at EB-I. An additional 24- inch culvert will be installed at EB-I to convey the developed lO-year runoff under Shoshone Street. Sub-Basin B-7 will discharge runoff to the existing 24-inch culvert at EB-2. This existing facility is adequate to convey the developed runoff under existing Ute Avenue. 3