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<br />1 <br /> <br /> <br />II <br />II <br />11 <br />1 <br />(Piled with the City) February 7, 1980. The study and its conclusions were <br />investigated and considered in the preparation of this CAP. <br />The Black Canyon Basin consists of 1426 acres and has been Identified as <br />topographically significant In terms of relief in the Pikes Peak Region. The <br />tributary In which the quarry and access road are located consists of 326 <br />acres or 23% oP the entire basin. For purposes of the CAP this area will be <br />referenced to as the Snyder Fork (of the Black Canyon Drainage Basin). Total <br />area of disturbance within the Snyder Fork by the access road and the current <br />quarry operation is approximately 25.8 acres which represents 7.9% oP the <br />Snyder Fork Subbasin and less than 2.ODti of the Black Canyon Basin. <br />Storm runoff from the Basin was estimated in the referenced study. Freak <br />flows at the Snyder Fork confluence with the Black Canyon main channel and <br />points downstream for Qe and Qtoo storms were reported as follows: <br />' LOCATION <br /> <br /> <br />1 <br /> <br />1 <br />1 <br /> <br /> <br />Snyder Fork ® Confluence <br />Black Ca~~yon ~ Confluence <br />Black Ca~~;~on ® State Highway 24 <br />Fountain Creek Near Black Can~~n <br />Confluence Upstream of <br />Highway 24 <br />•soo rce to FEMA, DeceeDer 1996 <br />Q~ <br />280 CFS <br />641 CFS <br />827 CFS <br />Qto <br />3650' CFS <br />Qtoo <br />654 CFS <br />1718 CFS <br />2225 CFS <br />Qtoo <br />16,000' CFS <br />The Snyder Fork Subbasin in the Master Plan was designated as Subbasins <br />F, G, and H. .The Stormwater facilities within the subbasin and adta~:ent <br />subbasins impacting the access road that are required in the master elan <br />included the following: <br />3 <br />1 <br />