Page 4 - Luke AFB Thunderbolt, May 2022
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May 2022 Spotlight Thunderbolt
Proposal for Erosion Control Measures on BMGR-East
  The 56th Range Management Office, Environmental Science Management, is proposing erosion control measures within the Barry M. Goldwater Range East (BMGR-E). RMO will complete a program- matic level analysis to look at these alter- natives, given the similarities in habitat and military infrastructure across the range. RMO will also conduct an analysis to address broad impacts with follow-up site-specific analysis. If you have any comments on alternatives to consider for evaluation, relevant information/research/ analyses that should be included and/or other comments, please email them to erin. by May 12, 2022.
The BMGR-E is a military training range on approximately one million acres of relatively unfragmented Sonoran Desert Land, managed by the United States Air Force. There are both tactical and manned ranges as well as constructed airfields that provide pilots a variety of different types of ground based targets and areas for their training exercises. These targets and airfields are constructed and accessed by utilizing existing access roads, which are often two-track dirt roads, or single lane asphalt roads.
The purpose of the proposed action is to protect military infrastructure from future storm events by allowing waterflow to be directed into natural drainages. There is a
Courtesy photo
Established in 1941, the Barry M. Goldwater Range lies along the U.S. and Mexico border in southwest Arizona and spans more than one million acres. Additionally, the BMGR makes up 7,000 miles of airspace and sees an estimated 54,000 sorties or more a year. The range is used by Luke Air Force Base, Davis-Monthan Air Force Base, Tucson Air National Guard Base, and the Marine Corps.
frastructure and Range access. Infrastruc- ture on the BMGR-E typically exists on flat, wide alluvial fans, which are subject to large erosive sheetflow from storm events. Various measures have been implemented to both protect the infrastructure from waterflow and to maintain the hydrologic function of the watershed; however, some need to be reworked and other additional measures are needed.
The proposed action and any alterna- tives considered need to meet the following objectives:
1) Need to maintain existing types of use and access.
2) Need to maintain historic watershed flows.
Alternatives that would meet these objec- tives include improving the existing water diverting structures at the military infra- structures by repairing existing structures and/or adding additional diversions. Diver- sion controls can entail berms, culverts, ditches, waterbars and/or notches/dips in existing roads. Existing velocity reduction controls can also be improved or installed, including check dams, gabion walls, mulch- ing, planting or energy dissipaters such as riprap. Under the no action alterna- tive, none of the existing water diverting or controlling structures, protecting the military infrastructures, will be repaired or improved.
  significant need to protect this infrastruc- ture to ensure that the range can be fully accessed and utilized, to allow necessary training activities to continue.
Impacts of rainfall-caused soil erosion and flooding have the potential to interfere with military training operations through
structural damage to military infrastruc- ture and/or through limiting access to needed parts of the range. Although the range has an average rainfall of less than 5 inches a year, intensive storms can cause flash flooding and severe erosive flows which can impact ground based military in-
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