Water Plan Public Meeting

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For those of you interested in Silver City’s water future, the Town of Silver City Utilities Department will be having a public meeting to discuss the update to the town’s 40-year water plan on Thursday, March 30 at 7:00 pm at the Grant Co. Administration Building, 1400 Hwy.180 East.
Dave Romero from Balleau Groundwater Inc. will make a presentation on their report “SUPPLEMENT ON WATER USE AND WELLFIELD SERVICE –TOWN OF SILVER CITY WATER PLAN” and answer questions.
You can download a copy of the report on the town’s webpage at www.townofsilvercity.org . The conclusions and recommendations from the report are included below.
Thanks,
Allyson Siwik, Executive Director
Gila Resources Information Project
305A North Cooper St.
Silver City, NM 88061
505.538.8078
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CONCLUSIONS
1. The Town of Silver City wellfield is capable of producing water to supply the high growth rate of 2.9 percent per year for about the next 30 years. After this time, an alternative source of water, well deepening or replacement wells would be necessary to maintain that high growth rate after a 40-year planning period.
2. The Town of Silver City wellfield is capable of producing water to supply a medium growth rate of 1.45 percent per year for the next 40 years.
3. Future water demand for the Town of Silver City is uncertain, but for planning purposes, high and low growth rates (2.9 and 1.2 percent) account for the demand required to supply all connections to the Town water system, while recognizing trends of service area expansion and population change that have been observed in the past.
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4. Town of Silver City groundwater diversions have averaged about\n2,800 acre feet per year in the last five years. High and low\nestimates of growth in water demand indicate a range of time (within\nthe next 16 to 38 years) in which future water demand exceeds the\nTown’s permitted use of 4,566.64 acre feet per year. \n
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5. With regard to wellfield interference, potential replacement\nwells for the Anderson and Gabby Hayes wells are preferable to a new\nContinental well located between the existing Frank’s and Woodward\nwellfields. \n
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6. Imported water would provide a new water source to the Town of\nSilver City municipal water system and would extend the life of the\nGila Group aquifer stored resource. \n
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7. There is an estimated 15,900 acre feet per year of groundwater\nflowing through the Mangas and Mimbres subbasins of the study area. In\nthe long term, the Town of Silver City wellfield as presently\nconfigured can sustain a yield of 4,200 acre feet per year. Configured\nat a 300-foot deeper pumping water level, the wellfield can sustain\n6,600 acre feet per year. The long-term yield of other users in the\nMangas and Mimbres subbasins has an effect on the sustainable yield of\nthe Town wellfield. \n
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RECOMMENDATIONS \n
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1. Consider the option of developing groundwater versus an\nalternative source to supply demand above the current permitted use of\n4,566.64 acre feet per year. If groundwater development is preferable,\nthen begin a water rights acquisition program that involves seeking\npotential rights for transfer into the Town water system. Considering\nthe timeline and uncertain outcome associated with acquisition of\nwater rights in New Mexico, it is reasonable to begin the acquisition\nprogram within a 40-year planning period. \n
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2. Prepare to deepen the wellfields in future years to extend the\nservice lifetime to meet required levels of demand. \n
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3. Planned wells should be constructed, developed and maintained\nto maximize efficiency. Incorporate a plan of field testing for\nwellfield expansion or replacement wells so that observed field\nconditions and as-built well conditions can be applied to wellfield\nsimulations.",1] ); //-->
4. Town of Silver City groundwater diversions have averaged about 2,800 acre feet per year in the last five years. High and low estimates of growth in water demand indicate a range of time (within the next 16 to 38 years) in which future water demand exceeds the Town’s permitted use of 4,566.64 acre feet per year.
5. With regard to wellfield interference, potential replacement wells for the Anderson and Gabby Hayes wells are preferable to a new Continental well located between the existing Frank’s and Woodward wellfields.
6. Imported water would provide a new water source to the Town of Silver City municipal water system and would extend the life of the Gila Group aquifer stored resource.
7. There is an estimated 15,900 acre feet per year of groundwater flowing through the Mangas and Mimbres subbasins of the study area. In the long term, the Town of Silver City wellfield as presently configured can sustain a yield of 4,200 acre feet per year. Configured at a 300-foot deeper pumping water level, the wellfield can sustain 6,600 acre feet per year. The long-term yield of other users in the Mangas and Mimbres subbasins has an effect on the sustainable yield of the Town wellfield.
RECOMMENDATIONS
1. Consider the option of developing groundwater versus an alternative source to supply demand above the current permitted use of 4,566.64 acre feet per year. If groundwater development is preferable, then begin a water rights acquisition program that involves seeking potential rights for transfer into the Town water system. Considering the timeline and uncertain outcome associated with acquisition of water rights in New Mexico, it is reasonable to begin the acquisition program within a 40-year planning period.
2. Prepare to deepen the wellfields in future years to extend the service lifetime to meet required levels of demand.
3. Planned wells should be constructed, developed and maintained to maximize efficiency. Incorporate a plan of field testing for wellfield expansion or replacement wells so that observed field conditions and as-built well conditions can be applied to wellfield simulations.
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4. Identify wellfield capture zones so that areas that contribute\nwater to the wellfield can be part of a wellhead protection\nprogram.
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5. Track adjacent wellfield withdrawals to intervene with\nlarge-scale changes that could impact the Town sources.
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4. Identify wellfield capture zones so that areas that contribute water to the wellfield can be part of a wellhead protection program.
5. Track adjacent wellfield withdrawals to intervene with large-scale changes that could impact the Town sources.

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