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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />4. Conduct investigations, including physical inspection ground survey, <br />hydrologic and hydraulic analysis to compute the hydraulic capacity <br />of the existing and proposed structures. <br /> <br />5. Study alternative solutions to the different aspects of the problem. <br /> <br />6. Present alternatives to the Town Council at a formal meeting. <br />Gather input for making a final alternative selection. <br /> <br />7. Prepare preliminary design drawings for the selected alternatives <br />including estimated construction costs. <br /> <br />8. Prepare a report documenting the results of the study and providing <br />a narrative for the preliminary design drawings. <br /> <br />D. ORGANIZATION OF REPORT <br /> <br />The report is structured so that each of the four aspects of the drainage <br />and flooding problems are addressed in its own section. Each of these <br />sections is subdivided into four subsections: 1. History; 2. Investigation; <br />3. Alternative Solutions and 4. Recommendations (including narrative of <br />preliminary design drawings). <br /> <br />E. MAPPING AND SURVEYING <br /> <br />The Town of San Luis provided photographic contour mapping at a scale of <br />1" = 200 I with a 4 foot contour i nterva 1. Thi s mappi ng had been prepared by <br />the U. S. Soil Conservation Service (SCS) and use for their RITO SECO <br />WATERSHED STUDY, in 1980. Rincon Surveying, Inc. of Alamosa (under <br />subcontract to WRC Engineering, Inc.) provided additional ground survey. CWCB <br />also provided ground survey information for the underground investigation and <br />floodplain analyses of the Rito Seco Basin. <br /> <br />-4- <br />