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Metropolitan Council. Metropolitan Council Environment Committee:. Water Supply Regional Model – First Test Case. June 10, 2008. Keith Buttleman, Assistant General Manager Lanya Ross, Senior Environmental Scientist. Overview. Problem Summary Water supply issues - PowerPoint PPT PresentationTRANSCRIPT
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Metropolitan Council
Water Supply Regional Model –
First Test Case
Metropolitan Council
Environment Committee:
June 10, 2008
Keith Buttleman, Assistant General Manager
Lanya Ross, Senior Environmental Scientist
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Overview
Problem Summary— Water supply issues— Availability assessment process
Modeling approach— Projecting demand— Refining the regional model— Interpreting model results
Summary
Benefits of Regional Planning Assistance
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Large growth planned— Investment in transportation, wastewater, parks
Perceived groundwater resource limitations— Low aquifer productivity— Surface water impacts of groundwater withdrawals
Preliminary engineering for surface water supply— High cost for treatment plant— Opportunities & challenges for cooperation
Water Supply Issues: Ramsey
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Ramsey began exploring potential partnerships
Application of metro groundwater flow model
Incorporation of model results into DNR water appropriation permit application review process
— Groundwater resources are adequate…for now
— Ramsey must monitor for surface water impacts
Availability Assessment Process
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Projected Demand: Ramsey
3 additional FIG Wells by 2007 (installed)*
11 additional FIG Wells by 2020*
* Source: Ramsey Comprehensive Water Plan Update – 2004
YearProjected Municipal
Average Day(gal/day)
Projected Municipal Maximum Day
(gal/day)
2010 3,300,454 15,600,514
2030 4,932,351 17,221,000
2050 7,319,032 20,443,162
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Refining the Regional Groundwater Flow Model
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Burns
Big Lake
Orrock
Elk River
Livonia
Stanford Athens
Otsego
Andover
Corcoran
Ramsey
DaytonHassan
Oak Grove
Rogers
Brooklyn Center New Brighton
Albertville
Mounds View
Zimmerman
Bethel
OsseoMaple Grove Brooklyn Park
Coon Rapids
Saint Francis
Anoka
ChamplinHanover
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0 2 4 mi
0 3 6 km!. Additional Wells
!. Existing Wells
Municipalities I6
Existing Well
Proposed (Modeled) Well
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2030 Drawdown, Franconia-Ironton-Galesville (FIG), based on average daily demand
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Client NameClient Location
1 0 1 km
Contour Interval: 1 ft7
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2030 Drawdown, FIG, based on summer peak
demand occurring for 2 weeks
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2030 Drawdown, Water Table, based on average daily demand
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9 Contour Interval: 1 ft
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2030 Drawdown, Water Table, based on summer peak demand occurring for 2 weeks
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Static Water Level
FIG Aquifer
Glacial Drift
Average Pumping Water Level
Peak Pumping Water Level
Note: Not to scale
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Water Table
Semi-Confining Layer
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Monitoring Well Locationsvs. 2050 Drawdown in the Water Table
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Interpreting Model Results
The FIG aquifer can sustain projected 2030 demand with appropriate well spacing
Surface water features may be impacted by demand
Additional field data will constrain impacts to surface water features, refine model
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Summary
Ramsey issues are not unique in the northwestern metropolitan area
Regional assistance clarified water supply options—FIG aquifer, with monitoring —Mississippi River
Ramsey and neighbors buy time to plan for 2050+ demand
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Benefits of Regional Planning Assistance
Better data, better analysis
Issues and options identified early in water supply planning process
Simplified permitting and approval process
Effective conservation strategies