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Home My WebLink About6a. Groundwater Update4ROSEMOUNTEXECUTIVE SUMMARY CITY COUNCIL Utility Commission Meeting: April 8, 2013 BACKGROUND Since the last Utility Commission meeting and discussion on groundwater, a number of activities have occurred that Staff would like to update the Commission on. • On March 26, Staff hosted a meeting on groundwater with representatives from Inver Grove Heights, Eagan, Apple Valley, Lakeville, Farmington, and Empire Township. The group discussed recent news articles on the anticipated decline of aquifer levels, Met Council activities, and next steps. There is currently a Southwest Metropolitan Area Groundwater group comprised of Minnesota Department of Natural Resources, Metropolitan Council, Dakota County, Scott County, Cities of Burnsville, Lakeville, Prior Lake, Savage, Shakopee, Shakopee Public Utilities Commission, and Shakopee Mdewakanton Sioux Community. The consensus of the group is that the expansion of the existing Southwest Metropolitan Area Groundwater group should be pursued to become the South Metropolitan Area Groundwater group. • On March 27, Councilmember Demuth and Director of Public Works Brotzler attended the Metropolitan Area Water Supply Advisory Committee meeting. The attached presentations were presented to the committee by Metropolitan Council staff. SUMMARY Staff will provide an update on these activities. GAUTILITY CONINIISSION \UC Information \20130408 UC Groundwater Update.docx AGENDA SECTION: AGENDA ITEM: Groundwater Update Old Business AGENDA NO. PREPARED BY: Andrew J. Brotzler, PE, Director of Public Works /City Engineer ATTACHMENTS: Met Council Presentations APPROVED BY: RECOMMENDED ACTION: Discussion BACKGROUND Since the last Utility Commission meeting and discussion on groundwater, a number of activities have occurred that Staff would like to update the Commission on. • On March 26, Staff hosted a meeting on groundwater with representatives from Inver Grove Heights, Eagan, Apple Valley, Lakeville, Farmington, and Empire Township. The group discussed recent news articles on the anticipated decline of aquifer levels, Met Council activities, and next steps. There is currently a Southwest Metropolitan Area Groundwater group comprised of Minnesota Department of Natural Resources, Metropolitan Council, Dakota County, Scott County, Cities of Burnsville, Lakeville, Prior Lake, Savage, Shakopee, Shakopee Public Utilities Commission, and Shakopee Mdewakanton Sioux Community. The consensus of the group is that the expansion of the existing Southwest Metropolitan Area Groundwater group should be pursued to become the South Metropolitan Area Groundwater group. • On March 27, Councilmember Demuth and Director of Public Works Brotzler attended the Metropolitan Area Water Supply Advisory Committee meeting. The attached presentations were presented to the committee by Metropolitan Council staff. SUMMARY Staff will provide an update on these activities. GAUTILITY CONINIISSION \UC Information \20130408 UC Groundwater Update.docx Water Supply Technical update - Future management scenarios Water Supply Trends Municipal Water Use in Seven - County Twin Cities • Increased reliance on Metropolitan Area, Minnesota groundwater ■ %Groundwater ■ %Surface Water 80% — Surface water: major 70% source until 1970s 60% — Groundwater: major 50% source since 1980s 40% 309' 200 100 0% 1941 -1950 1951 -1960 1961 -1970 1971 -1980 1981 -1990' 1991 -2000 2001 -2010 600.0 } 0 400.0 0 J 00.0 Z �I 1� "BusHIess is Usu,1l" . allwoj Master Plan Slll "f,1Ce WIter Alternative GI'OIIIICI1;1 Iter SUrf,1Ce W ACI* 5 -Mile Zolle 10 -Mild Zolle 2030 Model- projected Drawdown in the Prairie du Chien - Jordan Aauifer City & Township Boundaries < 5 feet r 5 - 10 feet 10 - 20 feet a -20 -30 feet I \ .30 - 40 feet >40feet T, -- Drawdown Exceeds 50% Available Head Note: These model results assume long- term average conditions and continued development of traditional water supplies. Summer conditions may excacerbate short-term drawdown. a Metropolitan Council, 8/2612009 View datasets online at http:/ /gis.metc.state.mn.us/makeaniap Source. Metropolitan Council SJ 0 5 10 20 Miles L _� LF �' Q Twin Cities Metropolitan Area Aquifer Analysis Prairie du Chien - Jordan Aquifer 30% Reduction in 2030 Future Groundwater Demand Drawdown (ft) U <5 L_ 71 5.1 - 10 10.1 -20 - 20.1 - 30 - 30.1 - 40 - 40.1 - 45 Drawdown Exceeds 50 %otAvaila We Head City & Township Boundaries Rivers I I I I I I I 0 2.5 5 10 15 Miles qk T,.,rin Cities Metropolitan Area Aquifer Analysis Prairie du Chien - Jordan Aquifer Lr1.pp0 Two E"I Etltx' ' 0. C_ - -. ND.pien 1� co4.nw eamxr MpDYlI ,M°+4111t fDr.Di Lirt ! 5[MDi �M/we Orl 6t ADDS GAb. 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EJeu T.p i CamellOt■T.D � N■Tpbn Tyq. b -0 "T.p Et h E RtnOOpn TwD On1eMYe T.RW�T.. -u{j�p 0 2.5 5 10 '15 Miles ,LEI r Twin Cities Metropolitan Area Aquifer Analysis Prairie du Chien - Jordan Aquifer 50% Reduction in 2030 Future Groundwater Demand Drawdown (ft) <5 5.1 -10 - 10.1 -20 - 20.1 -30 - 30.1 -40 - 40.1 -45 - Drawdown Exceeds 50% of Available Head L� City & Township Boundaries Rivers 0 2.5 5 10 15 Miles Twin Cities Metropolitan Area Aquifer Prairie du Chien - Jordan Aquifer Within 10 Miles of Major River (80% Reduction) Rivers E— 1 City $ Township Boundaries 0 2.5 5 10 15 Miles Twin Cities Metropolitan Area Aquifer Analysis 6 R,rop Prairie du Chien - Jordan Aquifer I n.DDp .D E,:1 Beme 80% Reduction in 2030 Future Groundwater Demand Drawdown (ft) <5 5.1 - 10 - 10.1-20 -20.1-30 ND ..mpT.D - 30.1 - 40 >nY .T.R 1'hicpn,T. - 40.1 - 45 ® Drawdown Exceeds 50% of Available Head City & Township Boundaries Nv■ Rivers N -t- F j3''' Epee Pear! 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M a NXTr On 31 All SW in MWSP and WBL communities 2030 Rqe= Dom- °�-•.a° ON Goon R>DOS E N1t Drawdown (ft) ►.r p . kx.�..w...aJ <� -1O � Cp[onN ., vn .aY Lr nanM. fe.ea•t GnxlinfW a NMn Oa = nlrple. T.p -9.9 - -5 «trar r anprY GTt ,n� fn" a Wnnf NlDMptn[e pinpn il. MiY L Cin ti G n• R «pn�f "D D - 0.1 -5 ... Mfp� Nt ItD'bp00 = aW ¢oM Tr - 5.1 - 10 ronD w• IfmfipDlt a nr L.tf,.npT "Of r «p Trp iM1prn T.p unnemso . D DnN MI $ Cca P a 10.1 -20 Ec Var,;p T nc rWp I u n $. YWMO1fy M[A - 20.1 - 30 RKMf p � N Fn>mn p TrD 'nimitK - 30.1 - 40 Ta In u at City & Township Boundaries _ GroacltfE •• T.p Na E,Dtn Of.iEf efface Rivers eelRMee pMlDn t.c UnEe I�[DJi .r tica TrD �bD'! :lieY RaemDrl TnPf Tap •..�/i I V "tllpga II..�� win[ «t Tfp ..an c.anc <o TrD , � ••.. � '- VNmIRm TM a.�en �q, Ri na hG T.e � i. }� Oa Rnfr T. Ll�t, a pee Trp. �T�T YRpNn Trp. I pa L "T. rr M nRr "a/tft trp d Et•ef� ".c of f �r0 "tfna T.Y GeWI JY E�.tta T.c G Trp. "amp$n Taa. hp� i2fn.o - e naffs1: ^.* I 0 2.5 5 10 15 Miles Twin Cities Metropolitan Area Aquifer Analysis Prairie du Chien - Jordan Aquifer Analyzed by USGS City & Township Boundaries Rivers 0 2.5 5 10 15 Miles Twin Cities Metropolitan Area Aquifer Analysis Prairie du Chien - Jordan Aquifer All SW in WBL Area Communities 2030 Drawdown (ft) - -10 � 1-9.9--5 -0.9 -0 - 0.1 -5 - 5.1 - 10 - 10.1 -20 - 20.1 - 30 - 30.1 - 40 C�City & Township Boundaries Rivers 0 2.5 5 '10 15 Miles r� Informing Land Use Decisions: Recharge Potential Mapping • Provide technical information about groundwater recharge potential • Inform upcoming discussion of regional water supply vision and policies (Thrive IVISP 2040) Precipitation So'l Unsaturated zone Aquifer 2030 Prairie du Chien - Jordan Business as Usual Aquifer Drawdown < 5 feet 5 -10 feet 10 -20 feet 20 -30 feet 30 -40 feet 2030 Drawdown > 50% Available Head: Prairie du Chien - Jordan 2030 Prairie du Chien - Jordan 5% T Recharge Aquifer Drawdown -- �` < 5 feet 5 -10 feet 10 -20 feet - 20 -30 feet ` 30 -40 feet 2030 Drawdown > 50% Available Head Prairie du Chien - Jordan m M" Projects to Enhance Recharge 5% Increase in Recharge = 30 MGD j East Bethel 75 $20M $28 -$50 Infiltration NE Interceptor 3 -10 $71 -$245M $25.00 Infiltration SMSC Injection Well 30 Not Available CHWD Infiltration 950 $400,000 $13 Trenches CHWD Rain Gardens 1,400 $160,000 $7 1: Wum ,, r - How much water infiltrates, and where? How fast does water move to aquifers? 'r " ' Rp-nharap Pntpntiv Infiltration Rate •1 ✓ ,l y _ Tr / _- `. ! �' � I tom, �I y ;. •_" J � �" RI I • t /• M: Low Travel Time to Aquifers High Recharge Recharge Potential High F 1, Moderate NLow Regional discharge, or not enough data to evaluate Land use planning will be informed by information about recharge potential • Park acquisition • Stormwater infrastructure planning • Transit corridor location &type selection 9 Wastewater discharge planning � 1 Recharge Potential High Moderate Low Regional discharge, or not enough data to evaluate Wastem Service Recharge Potential High ;Moderate Low Regional discharge, or not enough data to evaluate Transit Recharge High Moderate ® Low Potential —] Regional discharge, or not enough data to evaluate