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<br />. . <br /> <br />. <br />. ~ <br /> <br />. <br /> <br />. <br /> <br />.BRW <br /> <br />.emtlll:' A-DAMES &-M-60RE GROUP CoMPANY <br /> <br />Roaring Fork and Fryingpan River Multi-Obiective Planning Project <br /> <br />SCODe of Services <br /> <br />D. Develop Display/Education Materials <br /> <br />Total estimated fees associated with Tasks 0.1 through 0.3 are $4,000. One major presentation <br />workshop will be conducted as a final presentation of the project to stakeholders, local officials and <br />interested public. <br /> <br />Task 0.1. - Review Historic Aerial Photographs <br /> <br />Including historic aerial photographs in the GIS will be an extremely powerful tool to rally <br />community support for a channel stability program. In the past, people have viewed photographs <br />individually at different scales and tried to make some evaluation as to channel migration. <br />Overlaying rectified photographs to an exact scale along with USGS mapping and floodplain <br />information will help engineers, planners, managers and landowners make informed decisions <br />without becoming "too technical". The power of GIS to bring information together is very <br />impressive as demonstrated during the interview. <br /> <br />Work product will be the final GIS and report. We propose to conduct a large workshop to <br />dramatically demonstrate the information gathered under this project. We will utilize the In-Focus <br />machine to project the computer graphics on a screen. Also, key information from the report will <br />be displayed in Power Point. We do not propose to generate additional graphic boards other than <br />the information produced in the report and GIS mapping. <br /> <br />Task 0.2. - Develop Computer Modeling <br /> <br />Presently, common modeling supports only one-dimensional analysis of instability. Modeling in <br />HEC-6 shows only vertical changes in channel bed elevation. It does not demonstrate lateral <br />migration which is of primary importance to land planners. We will utilize aerial photographs pre- <br />and post- flooding to demonstrate the effects of flooding on channel stability. This work will be <br />incidental to the aerial photograph analysis under Task A.2. <br /> <br />Regarding recommended mitigation measures and the impacts upon them from flooding, our work <br />in Task C.1 will evaluate the limitations on potential stabilization measures, Stabilization <br />alternatives will be evaluated on cost, life-span and maintenance. We will look at the tradeoffs <br />between low-impact short life-span strategies and higher-cost alternatives. Using the hydraulics of <br />different recurrence floods from previous HEC-2 and HEC-RAS modeling, we will analyze the river <br />forces to evaluate the anticipated effective life of proposed mitigation measures. <br /> <br />In certain critical stabilization reaches where flood hydraulic information is available, we will <br />develop "Sediment-Rating Curve" graphs to display the rate of sediment transport as a function <br />of the flow discharge and recurrence event. This analysis was developed in Mr. Krehbiel's thesis <br />work. These curves will be similar to the example curve shown in the BRW proposal on page 6, <br />except sediment transport (bedload) will be on the x-axis, and discharge (instead of mean flow <br />depth) will be on the y-axis. If the hydraulic information is available, we will also label the event <br />recurrence interval in addition to the discharge (i.e., 50-year event label where the bedload is <br />mobilized). <br /> <br />K:\Proposal\02830-98\O 15\Scope.doc <br /> <br />Page 6 <br /> <br />July 14, 1998 <br />Offices Worldwide <br />