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VILLAGE OF PATCH, NM, FEASIBILITY STUDY

US Army Corps of Engineers Albuquerque District. VILLAGE OF PATCH, NM, FEASIBILITY STUDY. Village of Patch Case Study Seattle Environmental Planning Class June, 2009. Patch,. Ch 1 Module 2. HO #s 2 & 2a. Study Authority. Authority.

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VILLAGE OF PATCH, NM, FEASIBILITY STUDY

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  1. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY Village of Patch Case Study Seattle Environmental Planning Class June, 2009 Patch, Ch 1 Module 2 HO #s 2 & 2a

  2. Study Authority Authority “The Secretary of the Army is hereby authorized directed to cause surveys for flood control and allied purposes, including channel and major drainage improvements to be made under the direction of the Chief of Engineers, in drainage areas of the United States and its territorial possessions, which include the localities specifically named in this section” …Patch, NM

  3. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY The study is located in Patch, NM. The purpose of the feasibility study is to determine Federal interest and optimize a flood damage reduction/ecosystem restoration plan for the city of Patch. Structures and roadways have been impacted by flows from the surrounding mountains, significantly flooding the community twice in the last 15 years. Flooding originates from two sources-Spring Canyon and Placitas Arroyo. Initial investigations determined that there is a likely Federal interest in constructing flood control projects in the area, the most probable alternatives being a small dam at Spring Canyon. Repeated flooding limits fishery populations. Regional Setting

  4. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY Drainage Area Patch, New Mexico

  5. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY Floodplains Patch

  6. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY • Flood History: • The Village of Patch experienced significant Flood events in 1988, 2002 and 2006. • FEMA and Corps’ analyses determined Spring Canyon is a flood threat to the Village of Hatch. • The entire Village of Patch lies within a 100-year Floodplain

  7. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY • Flood Potential: • Spring Canyon channel capacity is 1,300 CFX (100-year flow is-1% chance event-estimated at 2,600 CFS) • Estimated average annualized flood damages of $10.1 million from Spring Canyon

  8. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY Existing and Likely Future Without-Project Conditions • Physical Setting • 17.2 square mile watershed draining from the south flowing north into the Rio Grande • An upstream detention structure controls 15.4 square miles of the basin • Elevation in the drainage drops from 6,000 ft to 4,030 ft • Flooding events in 1988, 1992 and 2006 left three feet of water in the street

  9. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY Existing and Likely Future Without-Project Conditions • Physical Setting (continued) • Once flows enter the village there is no clear drainage pathway into the Rio Grande; floodwaters remain in place until evaporated. • The Village storm drainage system is sized for a 5-year event. Sediment renders the system largely inoperable during larger events

  10. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY Existing and Likely Future Without-Project Conditions • Social and Economic Conditions • 2004 population of 10,661 • 1284 single residential structures within the 1% event floodplain • 187 commercial structures within the 1% event floodplain • 127 public structures within the 1% event floodplain • 10 apartment within the 1% event floodplain

  11. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY Existing and Likely Future Without-Project Conditions • Social and Economic Conditions (continued) • Median income for a household: $21,200 • Many seasonal inhabitants • “Chile capitol of the world” • 172 homes with flood insurance

  12. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY More Information • Non-damaging Channel Capacity • 10,300 cubic feet per second (cfs) • 100-year flow • 20,600 cfs • Flood Damages • Estimated average annualized flood damages $10.1 Mil • Federal Disaster Area in 2006

  13. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY More Information • Biological Communities • Southern cottonwood-willow riparian forest occurs in Spring Creek Watershed. Salt Cedar dominates Placitas Arroyo. The forest provides canopy cover needed for sensitive nesting birds.

  14. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY More Information • Other Environmental Issues • 10 lower-income apartment complex occurs in close proximity to the channel confluence of Spring Creek & Placitas Arroyo. • New Mexico's Air Quality reviews imply that the high ozone levels in the northwest and southern parts of the state are part of a regional problem.

  15. VILLAGE OF PATCH, NM, FEASIBILITY STUDYCULTURAL RESOURCES • During a site visit, black-on-white pottery fragments, burnt plant remains and long bones were observed eroding out of the river banks some 10 feet below the current floodplain. • Another 2 feet below, a hard clay band was observed in the river bank profile in Placitas Arroyo.

  16. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY Plans Studied in Detail • No Action Plan • Non-Structural (Flood Warning) • Channel Improvements • Flood Detention • Upper Basin Structure • Lower Basin Structure

  17. US Army Corps of Engineers Albuquerque District VILLAGE OF PATCH, NM, FEASIBILITY STUDY Project Alternatives • No Action Plan • Non-Structural (flood warning) • Non-Structural (raising/flood walls) • Non-Structural (buyouts/relocation) • Channel Improvements • Flood Detention • Upper Basin Structure • Lower Basin Structure

  18. Impact Comparison of Alternative Plans

  19. US Army Corps of Engineers Albuquerque District Recommended PlanLocally Preferred Plan 100-yr (1% Event) Dam in Lower Basin VILLAGE OF PATCH, NM, FEASIBILITY STUDY Features of the Locally Preferred Plan include • Earth fill Dam approximately 14,000 ft. in length • Concrete spillway 200 ft. in length • Height of approximately 20 ft. • Outlet Conduit • 300 Acre-Foot Sediment pool • 151 Acre-Foot Water Storage pool

  20. Patch

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