ENROLLED 2023 Regular Session HOUSE RESOLUTION NO. 290 BY REPRESENTATIVES HODGES AND MINCEY A RESOLUTION To urge and request the Department of Transportation and Development to evaluate all potential areas in the upper Amite River Basin on the potential to detain or retain stormwater runoff through a system of structures. WHEREAS, the Amite River Basin covers portions of Amite, Lincoln, Franklin, and Wilkinson Counties in southwest Mississippi and East Feliciana, St. Helena, East Baton Rouge, Livingston, Ascension, and Iberville Parishes in southeast Louisiana; and WHEREAS, the Amite River Basin primarily has flooding from two different sources, the upper and lower basin; and WHEREAS, the upper basin flooding is caused from headwater flooding from rainfall events; and WHEREAS, the Amite River Basin was particularly impacted by the catastrophic flood of 2016; and WHEREAS, the Stormwater Master plan was launched in 2017 to address drainage problems in the most efficient and effective way possible for citizens; and WHEREAS, the plan will be developed in three phases, each phase including numerous activities; and WHEREAS, nearly all current efforts are focused solely on improving drainage to the point of exceeding the physical capacities of the lower watershed, and a responsible alternative is necessary; and WHEREAS, the Comite River Diversion Canal Project is underway to alleviate flooding that affects thousands of residents; and WHEREAS, alleviating flooding in the Amite River is an essential component in preparation for the next major rain event. Page 1 of 3 HR NO. 290 ENROLLED THEREFORE, BE IT RESOLVED that the Legislature of Louisiana does hereby urge and request the Department of Transportation and Development to evaluate all potential areas in the upper Amite River Basin on the potential to detain or retain stormwater runoff through a system of structures. BE IT FURTHER RESOLVED the study shall consist of the upper Amite River Basin North of the I-12 corridor where detention or retention of stormwater runoff could have a positive and meaningful impact on the volume and timing of stormwater reaching the middle and lower Amite River Basin. BE IT FURTHER RESOLVED the study shall determine if water supply sources and recreational facilities are able to be incorporated into the detention or retention structures and shall consider, at a minimum, the following: (1) The development of a plan of managed storage or retention in sufficient volumes to reduce flood impact to downstream areas for multiple storm sizes and durations, including the development of conceptual designs and potential system operation guidance to minimize flows downstream. (2) The evaluation of impacts by incorporating existing and proposed drainage improvements to quantify effects on the entire watershed. (3) An evaluation of how benefits of detention and retention in the upper Amite River Basin could support further efforts to improve drainage or flood control efforts in the lower Amite River Basin. (4) A determination of the viability of water supply and recreational facilities at each detention and retention structure. (5) A determination of the social and economic impacts and benefits both upstream and downstream of each structure. (6) An evaluation of the environmental impacts and benefits upstream and downstream from each structure and an evaluation of the potential impacts and benefits to the aquifers. (7) The development of the feasibility of design and construction with cost estimates of the detention or retention structures, in compliance R.S. 38:21. BE IT FURTHER RESOLVED that the Department of Transportation and Development shall recognize and acknowledge the efforts completed by others by utilizing Page 2 of 3 HR NO. 290 ENROLLED recently collected data, modeling efforts, and previous studies to reduce duplication of effort and accelerate the study process. BE IT FURTHER RESOLVED that the Department of Transportation and Development shall provide a written report detailing the completion timeline and the associated costs for the evaluation of the upper Amite River Basin to the chairman of the House Committee on Transportation, Highways and Public Works and the chairman of the Senate Committee on Transportation, Highways, and Public Works by January 1, 2024. BE IT FURTHER RESOLVED that a copy of this Resolution be transmitted to the secretary of the Department of Transportation and Development. SPEAKER OF THE HOUSE OF REPRESENTATIVES Page 3 of 3