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Water Supply Regional Model: First Test Case Overview and Planning for Ramsey, June 10, 2008

This document presents the findings from the Metropolitan Council Environment Committee regarding water supply issues and the modeling approach used in Ramsey. It outlines growth factors, availability assessments, and the challenges faced due to groundwater limitations and surface water impacts. By analyzing projected demand and refining the regional model, the committee seeks to ensure sustained water supply through better data and planning strategies. Enhanced cooperation and effective conservation strategies will be key to addressing future needs.

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Water Supply Regional Model: First Test Case Overview and Planning for Ramsey, June 10, 2008

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  1. 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

  2. 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

  3. Water Supply Issues: Ramsey • 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

  4. Availability Assessment Process • 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

  5. Projected Demand: Ramsey • 3 additional FIG Wells by 2007 (installed)* • 11 additional FIG Wells by 2020* * Source: Ramsey Comprehensive Water Plan Update – 2004

  6. Existing Well Proposed (Modeled) Well Refining the Regional Groundwater Flow Model 6

  7. 2030 Drawdown, Franconia-Ironton-Galesville (FIG), based on average daily demand Contour Interval: 1 ft 7

  8. 2030 Drawdown, FIG, based on summer peak demand occurring for 2 weeks Contour Interval: 2 ft 8

  9. 2030 Drawdown, Water Table, based on average daily demand Contour Interval: 1 ft 9

  10. 2030 Drawdown, Water Table, based on summer peak demand occurring for 2 weeks Contour Interval: 1 ft 10

  11. Static Water Level Average Pumping Water Level Peak Pumping Water Level ` Water Table Glacial Drift Semi-Confining Layer FIG Aquifer Note: Not to scale 11

  12. Monitoring Well Locationsvs. 2050 Drawdown in the Water Table Contour Interval: 1 ft 12

  13. 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

  14. 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

  15. 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

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