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I I I I I I I I I I I I I I I I I I I 001016 deposition would occur locally, and erosion would occur downstream. In some instances, the changes in the sediment transport are minor. allowing for improvements to the channel without significant local or offsite impact. In general. the creek wi 11 cont i nue to move hori zonta Ily unless restra i ned by revetments or natural soils conditions. Also, the creek bed is subject to high local scour and deposition which dictates the need for adequate maintenance for proposed improvements along the banks. The a 1 i gnment of Cherry Creek is determi ned in part by the 1 oca 1 soil s and geology and the past flood history. A review of the aerial photographs shows areas of movements in the past (see Figure-3). Near the Douglas County Line (Reach B), Cherry Creek has changed significantly. However, closer to Arapahoe Road, the alignment has remained essentially the same in the last 4D years. This lack of movement is due to the more erosive resistant soils in this reach (Reach A). The potential for movement described above illustrates the need to control the channel alignment in some areas, especially if development encroaches (i.e.. fill) into the floodplain. Shown on Figure-2 is the location of the existing and proposed water wells and the sanitary sewer. The impact of any proposed improvements to the c reek on these fac il it i es has been addressed. In some cases, the impact was significant to impose a constraint on the alternatives. The impact of the wells on the selected plan is discussed further in Chapter V-E. C. Alternative Categories All the alternatives developed address either the stabil ization of the channel or increased land utilization. 1. Stable Creek Bed The alternatives developed to stabilize the Cherry Creek bed are presented below. -24-