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I , Table 5 (continued) WORK ELEMENTS AND TASKS WORK ELEMENT G. DETERMINE POTENTIAL ADVERSE EFFECTS OF GRAVEL MINING OPERATIONS AND DEVELOP ALTERNATIVE METHODS OF PREVENTING ADVERSE EFFECTS IN THE CACHE LA POUDRE FLOOD PLAIN BETWEEN LAPORTE AND GREELEY TASKS : G..,1. G..,2. r i1E: ~: G..,3. G-:4. G..,5. G..,6. G..,7. G.,.8. G79. Define current gravel mining practices Develop conveyance data for ultimate flood plain conditions if current practices continue Determine resulting discharges and stages Evaluate flood-related impacts Develop alternative mining regulations Develop conveyance data for each alternative Determine resulting discharges and stages Prepare displays Prepare report WORK ELEMENT H. DETERMINE ALTERNATIVE HYDRAULIC DESIGN CONCEPTS FOR BRIDGE REPLACEMENT ALONG THE CACHE LA POUDRE RIVER THAT WOULD ASSURE THAT LOCAL FLOOD CONDITIONS WOULD EITHER REMAIN UNCHANGED OR BE REDUCED IF THE BRIDGES WERE REPLACED. TASKS: H-1. H-2. H_3. H,..4. H~5. ,\ :/ ' WORK ELEMENT I. TASKS : I,..1. I,..2. I.,.3. I,..4. I-5. Determine required bridge opening(s) with road raised above 100-year flood Determine required road-weir elevation and length for 50-year bridge design Determine required road-weir elevation and length for 10-year culvert design Prepare displays Prepare report IDENTIFY AND EVALUATE FLOOD PLAIN MANAGEMENT ALTERNATIVES ON BOXELDER CREEK BETWEEN HIGHWAY 14 AND PROSPECT STREET AND ALONG THE CACHE LA POUDRE RIVER AT LAPORTE, FORT COLLINS. AND GREELEY. Flood plain land use inventory Encode land use data Debug land use data Determine management alternatives (3) Develop associated land use 29