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Title: Continuing Authorities Program Section 205 Small Flood Risk Management Project, Hatch, New Mexico : Detailed Project Report and Environmental Assessment
Authors: United States. Army. Corps of Engineers. Albuquerque District
Keywords: Hatch (N.M.)
Rio Grande (Colo.-Mexico and Tex.)
Flood control
Environmental management
Environmental protection
Publisher: United States. Army. Corps of Engineers. Albuquerque District.
Abstract: This is a USACE planning document incorporating a Detailed Project Report and integrated Environmental Assessment. The DPR/EA presents the results of investigations completed to determine whether Federal participation is warranted for FRM on Spring Canyon in the Village of Hatch, New Mexico. The project sponsor is the Doña Ana County Flood Commission. The project area is located in the northwest corner of Doña Ana County, New Mexico. The Village of Hatch (Hatch) is located at the intersection of US Highway 85 and State Highway 26, approximately 35 miles northwest of Las Cruces, New Mexico. The Spring Canyon watershed contributing to flooding in the village covers approximately 7.18 square miles (sq mi) to the south of Hatch. An upstream detention dam addresses 5.4 sq mi of this drainage area. Despite this detention dam, constructed in 1939, flooding continues to occur in Hatch as the result of precipitation in Spring Canyon. Flows enter Hatch from the south and become trapped behind the elevated Hatch Canal (a key component of a regional gravity-fed irrigation system). As the majority of the developed portions of Hatch lie upstream of the Hatch Canal, ponding floodwaters regularly inundate the village. The entire Village of Hatch lies within the 1% chance exceedance floodplain for Spring Canyon. It is currently estimated that the mean 1% chance exceedance flood would cause damages of about $23.6 million to structures and contents in the study area. The investigations undertaken to assess the alternatives that could address or reduce the extensive flooding damages in the area are presented in the DPR/EA. The Environmental Assessment (EA) addresses the perceived effects of alternative plans developed to provide higher levels of FRM for floodplain communities, transportation infrastructure, and agriculture from flood flows originating in Spring Canyon. Together, the DPR/EA presents a complete package addressing the planning objectives and environmental impacts of the project. The proposed earthen embankment dam would be located upstream of the Village of Hatch adjacent to the Spring Canyon Arroyo. The dam site is just south of where the Colorado Drain and the Rodey Lateral meet. Suitable material from the existing spoil berm will be included in borrow for earthen dam construction. Two relocations would have to be performed prior to any borrow excavation. These consist of an abandoned leach field and an existing waterline both located within the retention basin area. In addition, an existing spoil levee, 1,100 feet in length, would have to be removed prior to the excavation of a new trapezoidal channel. The existing levee is located at the south end of the proposed retention basin, near the mouth of Spring Canyon. The upstream end of the inlet channel, which would convey water from the Spring Canyon to the dam, would be constructed of roller compacted concrete, transitioning to soil cement and then riprap. The outlet works would drain water from the retention basin into the Colorado Drain.
Description: Detailed Project Report and Environmental Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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