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HomeMy WebLinkAboutDrainage Reports - 01/12/1990k I -04 DRAINAGE REPORT FOR ROCKY MOUNTAIN BATTERY AND RECYCLING P.U.D. JANUARY 1990 PREPARED BY STEWART & ASSOCIATES, INC. Ali /S90 SITE LOCATION: The site is situate in the Northeast I of Section 2,. Township 7 North, Range 69 West of the Sixth P.M., Fort Collins, Larimer County, Colorado. The street address is 1475 North College Avenue. The area is 1.54 acres. It is bounded on the East by North College Avenue, the South by Cottonwood Plaza Shops, the West by vacant land, and on the North by Front Range Steel. The property is approximately 1150 feet South of Willox Lane. EXISTING CONDITIONS: Most of the site is in the 100 year flood plain of Dry Creek. the 100 year flood plain elevation is 77.3 fet as per the Dry Creek Drainage Planning by Gingery Associates, Inc. completed in April, 1980. At present there is not a designed outlet for runoff for properties in the area. For future developments in this area a master drainage plan shold be developed to serve the needs of these properties. The East 0.62 acres of the site is developed with two buildings, a asphalt driveway and parking area, and several small grass areas. North College Avenue is existing asphalt. There is an 18" CMP running along the west side of North College Avenue across the property. The West 0.92 acres is a horse pasture with very little grass. The slope on the East part of the site is away from the buildings at about 0.4% on the North side and about 1% on the South side of the buildings. There will be no site changes on this East 0.62 acres at this time. The slope on the West 0.92 acres is about 0.80% from North to South. OFF SITE: The Cottonwood Plaza Shops have constructed a one and one half foot dirt dike along their West property line to restrict the flow from the West. This has created a low area at the Southeast corner of the total site (100 feet South of our South boundary line).. When this area overflows, it goes east to College Avenue. All existing as runoff shown on Figure 1 goes to this low area now. There is also a dirt dike of one foot more or less along the South property line of Front Range Steel running about 200 feet west from their East property line. FINAL DESIGN: The East 0.62 acres of the site will not be considered in the drainage calculation because there is no change to the existing conditions. Therefore the existing runoff will equal the developed runoff for this area. The offsite runoff onto the property will be routed along the West of the site in a dirt channal. The channal is 0.5 feet feep by ten feet wide with a carrying capacity of 4.17 c.f.s. which is greater than the 100 year runoff to the site of 1.79 c.f.s. Flow onsite will be directed to the South of the building area where it will be detained. The required detention is 4896 cubic feet. The capacity of the detention pond is 7411 cubic feet. This is 33% larger than required which should help the overall drainage in the area. The outlet from the pond will be in a 6 inch P.V.C. pipe to the existing 18" CMP on the west side of College Avenue. The outlet rate is 0.65 c.f.s. which is less than the historic rate of 0.66 c.f.s. Rocky Mountain Battery and Recycling P.U.D. January 1990 Continued The 18" outlet pipe is not a designed storm drainage pipe but has been installed along the west side of College to help direct flow to Dry Creek by each individual property owners need. The flow along College Avenue varies from open channel to pipes across the different properties. The 18" outlet pipe does not have the capacity to handle all runoff to it; therefore our pond will not function as designed but it is better to have an outlet than to discharge back to overland flow. Franklin D. Blake, P.E. & L.S. y `, • i .. oeq'a¢• .y COMPUTATIONS Imes H. Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331 Date - '-//�,fiClient Sheet No. of 5- Ad By: Date Project: b No. bject --- ---- ...... z- -7- ...... ...... 00.. �170716r v " i COMPUTATIONS mes H. Stewart & Associates,. Inc. 214 N. Howes St. Ft. Collins, C0 80521 (303) 482-9331 J� Date all',"/9�Client:4in Sheet No. 2 of 5- kd By: -Date Project: Job No. ject / / .. 9 001, _ I .� .. 71 ,- Y • ex -W, e -9. .2 -- - -- - - - - -- - - - , - I •�' I i t -00 Z 000 017. A I I • J COMPUTATIONS ames H. Stewart & Associates, Inc. 214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331 y: -DateClient: a/ d� Sheet No. of hkd By: Date Project: 'el Job No. ibject ,G cvl I iD• / � �i � ,/ 7�Z 7 i' •II I il�II tl���: COMPUTATIONS nes H. Stewart & Associates, Inc. 214 N. Howes St.. Ft. 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