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I I I I I I I I I I I I I I I I I I I 001015 IV. ALTERNATIVE INVESTIGATION A. General Description Based upon an analysis of the floodplain and the sediment transport regime, the existing and potential future drainage problems for Cherry Creek were assessed. Various alternatives were devised to address each problem area or channel reach. These alternatives were reviewed at a meeting with the TAC and property owners to el iminate those options which were not considered viable alternatives. The CONSULTANT then assembled the viable alternatives together to form alternative plans. These plans were also presented to the TAC and property owners along with a discussion of the pro's and con's of each pl an. Afterwords, individual meetings were held with the property owners to determine which plan best suits their needs. The final plan as presented in this report is called the selected plan. Presented in this section are the detail s and procedures for developing the selected plan. B. Constraints and Impacts The first step in developing alternatives for the drainage problems was to identify the constraints imposed on the alternatives by the various physical features. The constrai nts identifi ed were the sediment transport, the ri ver morphology, the existing and proposed water wells, the alignment of the future Dry Creek Road crossing, and the existing sanitary sewer. As discussed in Chapter III, Cherry Creek transports an appreciable amount of sediment within the local South Platte River system. Any changes to Cherry Creek will effect the sediment load and therefore erosion and sedimentation of the channel. For instance, if the flow velocities are increased, additional erosion is possible unless the banks are protected. However, if the source of sediment is reduced then the river will make up for this loss of sediment by eroding the downstream channel. If the flow velocities are decreased, then -23-