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II I- I I I I I I I I I I I I I I I I- I CHAPTER "' M<\STER PLAN DRAWINGS General Plates 111-1 and 111-2 presented herein are taken from the Phase A report and show the lOO-year flood plain of the existing Niver Creek channel without any modifications. These two drawings are presented here for easy reference and comparison of the improvement achieved by constructing the recommended channel .. improvements. Plates 111-3 through 111-12 represent drainageway planning drawings for Niver Creek in the form of plan and profile sheets. The drawings indicate the proposed channel and structure improvements and the lOO-year flood plain which corresponds to the improved channel. Structure and channel improvements can be handled in a number of ways; therefore, design capacities are shown for each structure and channel reach in order to allow future development complete flexi- bility. The information shown on the drawings will allow developers and munici- palities to proceed with future development in an orderly and compatible manner. These drawings should not be used for final construction of individua I structures without a detai led investigation of topography, utilities and other items normally required for final design. The following discussion presents the design criteria and philosophy used in arriving at the proposed channel and structure modifications. The discussion is arranged to coincide with the drawings. South Platte River to Steele Street - Plate 111-3 A concrete lined energy dissipator, approximately 250 feet long, exists immediately downstream of the Steele Street crossing. The remainder of the chon- nel from the concrete lining to the South Platte River is 0 well defined natural 111-1