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<br />Cottonwood Creek Master Drainageway Plan <br />Colorado Springs, Colorado <br /> <br />Client Information <br /> <br />Client: NorWood Development Company <br />4065 Sinton Road Suite 200 <br />Colorado Springs, Colorado 80907 <br /> <br />Reference: Dave Jenkins <br />(719) 593-2600 <br /> <br />Project Information <br /> <br />The Cottonwood Creek drainage basin is a rapidly developing 18.6 square mile area <br />on the north edge of the City of Colorado Springs, The need for cost.effective <br />alternatives to traditional drainage infrastructure planning, design, and construction <br />led to the development of a minimum,impact Drainage Basin Planning Study (DBPS) <br />by Ayres Associates, The DBPS utilized the "prudent line" or erosion risk buffer <br />concept. <br /> <br />Previous drainage master plans were reviewed and modified by Ayres through <br />detailed geomorphic field studies, field surveying, and updated land use and utility <br />inventories, The extent of channel incision probl"ms, bank instability areas, and <br />depositional reaches were identified and mapped, Previous hydrologic and hydraulic <br />models were updated to determine peak design discharges and hydraulic conditions <br />corresponding to proposed development plans, <br /> <br />Based on the hydrologic, hydraulic, and sediment transport characteristics, Ayres <br />developed the DBPS on a reach-by,reach basis to identify particular stream <br />segments where the implementation of prudent-line concepts was feasible, Costs <br />associated with land acquisition and construction of channel improvements were <br />developed, and a revised basin fee was calculated, <br /> <br />Noteworthy features of the project included: <br /> <br />. Savings of over $12.4 million were realized over previous master plan <br />recommendations <br />. A series of costly detention basins were eliminated <br /> <br />Ayres Associates' Staff <br /> <br />Dave Frick, P,E, <br />Doug Laiho,P,E, <br />Chris Carlson,P.E, <br /> <br />Project Manager <br />Project Engineer <br />Project Engineer <br />