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I I I I I I I I I I I I I I I I I I I 10 flood magnitudes represent events which can cause severe damage but would not inundate the area characteristic of a 100-year event. The peak flows for these events should be used in the planning and engineering of improvements where the higher risk of failure or damage is economically feasible and the hazard to life and property is lower or non-existent. In the reach from Cherry Creek to Parker Road, development exists adjacent to the flood plain. The hydraulic analysis indicated these structures may be endangered by potential flooding from flood events greater than the 100year event. The crossing at Parker Road is the only road crossing on Piney Creek that is adequate for the 100- year flood. Flood magnitudes greater than the 100-year flood magnitude can and will occur. Land improvement adjacent to the 100-year flood plain limit should consider the remote chance for possible flood damage. In the reach from Parker Road to Orchard Road there is presently no development in the flood plain. The flood plain is wide and shallow but well defined. The crossing at Orchard Road is a grade crossing as there are no pipes or structures to carry the Piney Creek flow beneath Orchard Road. Therefore, the road is inundated by regular flood events. Flooded Areas and Flood Damages The 100-year flood plain limits and water surface profiles are shown on the attached Flood Hazard Area Delineation Maps. The computed 100-year flood elevations at each reference point are tabulated in Tables 6, 7, 8 and 9 for each of the four streams. A description of the extent of flooding is discussed in the following paragraphs. Inthe reach from Orchard Road to Davidson Road, residential de- velopment is on the west banks of piney Creek. The houses are not in the 100-year flood plain though numerous houses are very close to the flood plain limits and could be damaged by any flood event greater than the 100-year storm. This area is shown on Drawings PC-7 and PC-7A. The crossing at Davidson Road is a grade-type crossing. Piney Creek - The flood plain limits and profiles for Piney Creek are shown on the Flood Hazard Delineation Maps, Drawings PC-l through PC-19. Piney Creek joins Cherry Creek approximately 2,000 feet west of Parker Road. The Piney Creek flood plain at the con- fluence is influenced by the 100-year flood plain of Cherry Creek. From Davidson Road to Airline Road there is no development in or adjacent to the flood plain. The flood plain is well defined in this reach. The proposed corridor for I-470 crosses Piney Creek in this reach.