1 / 17

Metropolitan Council

Metropolitan Council. Water Availability Technical Focus Group :. Water Supply Planning in the Northwest Metro. June 9, 2008. Lanya Ross Senior Environmental Scientist, Water Supply Planning, Metropolitan Council. Overview. Problem Summary Water supply issues

hpurnell
Télécharger la présentation

Metropolitan Council

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Metropolitan Council Water Availability Technical Focus Group : Water Supply Planning in the Northwest Metro June 9, 2008 Lanya Ross Senior Environmental Scientist, Water Supply Planning, Metropolitan Council

  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. Peak Pumping Water Level Average Pumping Water Level Static Water Level Glacial Drift Semi-Confining Layer FIG Aquifer Note: Not to scale 9

  10. 2030 Drawdown, Water Table, based on average daily demand Contour Interval: 1 ft 10

  11. 2030 Drawdown, Water Table, based on summer peak demand occurring for 2 weeks Contour Interval: 1 ft 11

  12. Static Water Level Average Pumping Water Level Peak Pumping Water Level ` Water Table Glacial Drift Semi-Confining Layer FIG Aquifer Note: Not to scale 12

  13. Monitoring Well Locationsvs. 2050 Drawdown in the Water Table Contour Interval: 1 ft 13

  14. 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

  15. Planning for Future Supplies No impact identified – Proceed with new well permitting and re-evaluate monitoring plan Impact identified – Alternative supply must be implemented • Intensify conservation to delay need for supply • Options re-evaluated, including use of Mississippi River

  16. 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

  17. Benefits of Regional Planning Assistance • Better data, better analysis • Issues and options identified early in water supply planning process • Simplified permitting and approval process • Economy of scale and consistency in conservation efforts

More Related