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Title: Rio Grande de Manati at Barceloneta, Puerto Rico : Section 205 Final Detailed Project Report and Environmental Assessment
Authors: United States. Army. Corps of Engineers. Jacksonville District
Keywords: Flood control
Environmental protection
Puerto Rico
Publisher: United States. Army. Corps of Engineers. Jacksonville District.
Abstract: This detailed project report describes the flooding and related problems resulting from the overflow of Rio Grande de Manati in the vicinity of the town of Barceloneta, presents the analysis of several different measures to reduce flooding damages, and recommends a plan of action. The report was prepared under the authority provided in Section 205 of the Flood control Act of 1948 as amended. The study was conducted at the request of the Puerto Rico Department of Natural Resources. The detailed study area lies in the coastal flood plain of Rio Grande de Manati within the municipalities of Manati and Barceloneta. This area is located in the north coast of Puerto Rico. Rio Grande de Manati has a drainage area of approximately 447 square kilometers (172 square miles). The southern part of the river basin is mountainous with elevations up to 800 meters above mean sea level (msl). The portion on the northern extreme of the basin is, for the most part, a coastal flood plain with ground elevations fluctuating from about three meters below mean sea level (msl) to about six meters above msl. Rio Grande de Manati main channel has a relatively low hydraulic capacity at the coastal plain. Discharges eqilal or above the 2-year frequency discharge will exceed the capacity of the river. The excess flows over the banks of the river into the coastal plain producing damages in the communities. Approximately 914 families will be affected by the 100-year flood for existing conditions. Total damages range from about $4.0 million for the 5-year flood to $28.6 million for the SPF with average annual damages being about $3.0 million. Industries, residences, and public facilities are, in that order, the most affected structures. The recommended flood control plan consists of providing 5,200 meters of levees for flood protection, 1,545 meters of pilot channels, and minimum interior drainage facilities for levee to perform. Interior drainage elements include: 161 acres for ponding area, 5,230 meters of canal, culverts under two highway ramps, and two drainage structures. The plan is designed to protect against the 100-year flood and would reduce 92 percent of the total annual flood damages. This plan maximizes the net national economic development benefits. The total first cost of this plan is about $10.6 million with total annual cost estimated at $942,000. Since total annual benefit is $3,025,000, the implementation of the project would result in a benefit to cost ratio of 3.2/1.0. Pertinent economic data for the recommended plan is based on April 1993 price level and interest rate of 8-percent. Under the current cost-sharing policy, the Federal Government cost would be $4,609,000 while the non-Federal share would amount to $6,013,000.
Description: Detailed Project Report/Environmental Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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