FLOOD02312 - Laserfiche WebLink

Home Browse Search

F. Mapping The Canon City, Colorado, 1 :24,000 topographic quadrangle maps prepared by the U.S. Geological Survey were used as the basin map for this project. These maps use 20 feet contour intervals and was photo revised in 1976. The maps were used for the general pUl]JOses of basin boundary delineation and for the establishment of principal tributary regions and subbasins within these regions. Recent road additions were added to th<: maps to reflect current conditions. The mapping was supplemented with 2 ft contour, 100 ft scale mapping of a po rtion of the drainage basin. These maps were produeed in 1979 by Ponderosa Engineering and used to better delineate the drainage in undeveloped areas. G. Field Reconnaissance Field reconnaissance of the basin was performed in order to suppkmcnt existing roadway and site development plans, and existing drainage repOlts, Culvert locations, sizes and depths were field checked and subbasin flow patterns were analyzed. In addition, existing as well as potential problem areas were noted for a more in-depth ,evaluation. Aerial photography, taken in March 1994, was utilized to identify current land uses ,md drainage pallerns throughout the Orchard A venue Drainage Basin. H. Environmental Considerations Currently no significant environmentally sensitive areas exist in the basin except for an area adjacent to the Arkansas River. This area will be in its natural state. Any modifi<:ations to this area will be designed in such a manner as to create no adverse affects on the wetl,md area. ll. PROJECT DESCRIPTION A. Basin Description and Location The Orchard Avenue Drainage Basin encompa.sses the central portion of Canon City. It runs from the northeast Canon Basin on the west to the Abbey Drainage Basin on the east and from the Four Mile Creek Drainage Basin on the north and the Arkansas River in the south. It is situated in Township 18S, Range 70W of the 6th PM, Fremont County, Colorado. The basin contains approximately 3.14 Square Miles. A majority of tht: lands are currently platted, but not yet developed. The runoff from this basin flows in a southerly dire<:tion and crosses U.S. Highway 50 (US 50) in culverts which empties into roadside ditcbes. The topography varies from mild slope of 1 % in the lower portion of the basin to 3% to 5% in the central portion of the basin. 'The vt,getation consists primarily of native rangeland grasses with some trees and wetland vegetation along portions of the main channel. B. Maior Drainagewavs and Facilities The Orchard Avenue Drainage Basin currently has no direct outlet channel which carries the runoff to the Arkansas River. The northern reaches of the basin flow through ranches and newly developed areas and into the existing Hydraulic Ditch (canal) which traverses across the entire basin. The upper channels vary from broad swales with heavy vegetation to well defined channels and roadside ditches with relatively sparse vegetation.