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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />11 <br /> <br />Above Airline Road, development has occurred on both sides of <br /> <br /> <br />Piney Creek. Structures that have been built are high on the <br /> <br /> <br />banks so they will not be susceptible to flood damage during the <br /> <br /> <br />100-year storm. Development covers the entire reach from Air- <br /> <br /> <br />line Road to Piney Lake Road. Just downstream of Piney Lake <br /> <br /> <br />Road, the upper study limit, there is a small man-made lake. The <br /> <br /> <br />spillway for the lake is located on the north end of the embank- <br /> <br /> <br />ment. Downstream of the dam, the flood plain widens and en- <br /> <br /> <br />compasses the county road. This area is shown on Drawings PC-IS <br /> <br /> <br />and PC-19. <br /> <br />the bridge structure is also inadequate for passing the 100-year <br /> <br /> <br />flow. The street will be overtopped to a depth of approximately <br /> <br /> <br />two to three feet during major flood events. <br /> <br />The reach from Arapahoe Road to Lanes road is similar to the <br /> <br /> <br />previous reach in that there is no development and the flood plain <br /> <br /> <br />is well defined. Due to the proximity to the Arapahoe County <br /> <br /> <br />Airport, development pressures exist in this reach. The area is <br /> <br /> <br />planned for commercial and light industrial development. <br /> <br />Cottonwood Creek - The flood plain limits and water surface <br /> <br /> <br />profiles for Cottonwood Creek are shown on the Flood Hazard Area <br /> <br /> <br />Delineation Maps, Drawings CC-I through CC-l4. Cottonwood Creek <br /> <br /> <br />is located west of Cherry Creek adjacent to Lone Tree Creek. <br /> <br /> <br />Correspondingly, Cottonwood Creek and Lone Tree Creek are similar <br /> <br /> <br />in characteristics and in the degree and type of development <br /> <br /> <br />located in the basins. In the reach from the downstream limit <br /> <br /> <br />of the study, at the Cherry Creek Lake Recreation Area limits, <br /> <br /> <br />to Arapahoe Road, no development has occurred which would be <br /> <br /> <br />susceptible to flood damage from a 100-year storm event. The <br /> <br /> <br />only road crossing in this reach is at Peoria Street which is <br /> <br /> <br />inadequate and frequently overtropped. Because of the low road <br /> <br /> <br />embankment at Peoria Street there is no backwater effect from <br /> <br /> <br />this crossing. The flood plain in this reach is well defined <br /> <br /> <br />and stays within the current valley section. At Arapahoe Road, <br /> <br />The reach from Lanes Road to Inverness Drive at the Arapahoe- <br /> <br /> <br />Douglas County line, includes the only major development along <br /> <br /> <br />Cottonwood Creek. The development is known as the Inverness <br /> <br /> <br />and the flood plain has been improved and regraded to be used as a <br /> <br /> <br />golf course. Located across the creek are numerous crossings, in- <br /> <br /> <br />cluding three pedestrian bridges and three road crossings. The <br /> <br /> <br />crossing at Inverness Drive East is adequate for the 100-year <br /> <br /> <br />storm runoff. All other crossings will be inundated by a 100- <br /> <br /> <br />year event. This area is mapped on Drawings CC-S through CC-7. <br /> <br />The reach from Inverness Drive, at the Arapahoe County-Douglas <br /> <br /> <br />County line, to Parker Road,is undeveloped with no damageable <br /> <br /> <br />improvements in the flood plain. The flood plain is well defined <br /> <br /> <br />ranging in width from approximately 100 feet to approximately <br /> <br /> <br />600 feet. At West Parker Road, the creek crosses under the road <br /> <br /> <br />in two large metal culverts. The culverts are inadequate for the <br />