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i <br />Drainage Analysis Proposed Conditions <br />Mr. Lorenzo Wingate <br />City of La Porte <br />August 4, 2022 <br />Page 5 <br />a) Develop one (1) improvement alternative to reduce ponding in the neighborhood. Adjust the <br />InfoWorks ICM model to reflect the improvement alternative. The alternative will include <br />evaluation of mitigation to show no adverse impact downstream. Improvements may include: <br />a. Storm sewer replacement <br />b. Parallel storm sewer <br />c. Detention/mitigation <br />d. Channel improvements <br />e. Street re -grading <br />b) Simulate the improvement alternative for the 5-year, 10-year, and 100- year storm events to assess <br />the hydraulic effectiveness of the project. Review potential impacts and assess the 100 ac-ft <br />detention basin. Model the effects of connecting the east -west channel north of the project area to <br />B 109-00-00. Calculate the number of parcels/structures impacted, inundated areas, and middles of <br />roadway impacted. <br />c) Develop estimated construction costs for the alternative including a 30% contingency. <br />d) Preliminary civil design analysis including utility conflicts, constructability, and typical sections. <br />e) Present the proposed alternative and recommendation to the City. <br />Preliminary Engineering Report <br />a) Prepare draft preliminary engineering report including methodology, assumptions, results, and <br />recommendations. The report will include tables, exhibits, and appendices. The draft report will <br />be submitted to the City and HCFCD for review and comment. <br />b) Based on comments received on the draft report, revise and submit the final report to the City for <br />approval. Include any digital information such as GIS shapefiles and models. <br />c) Prepare presentation and attend Drainage Committee meeting to present findings and <br />recommendations. <br />Item 2: Optional Additional Proposed Conditions Analysis (if authorized) <br />a) Develop two (2) additional improvement alternatives to reduce ponding in the neighborhood. <br />Adjust the InfoWorks ICM model to reflect the improvement alternatives. Each alternative will <br />include evaluation of mitigation to show no adverse impact downstream. Improvements may <br />include: <br />a. Storm sewer replacement <br />b. Parallel storm sewer <br />c. Detention/mitigation <br />d. Channel improvements <br />e. Street re -grading <br />b) Simulate each improvement alternative for the 5-year, 10-year, and 100- year storm events to assess <br />the hydraulic effectiveness of the project. Review potential impacts and assess the 100 ac-ft <br />detention basin. Model the effects of connecting the east -west channel north of the project area to <br />B 109-00-00. <br />c) Develop estimated construction costs for each alternative including a 30% contingency. <br />d) Preliminary civil design analysis including utility conflicts, constructability, and typical sections. <br />Present the proposed alternatives and recommendations to the City. <br />