First Steps in Inter-Basin Coordination for SGMABasin Boundary Modification Requests in Santa Cruz County
Cameron Tana, Sean Culkin, Nicholas Byler, and Derrik WilliamsHydroMetrics Water Resources Inc., Oakland CA, USA, [email protected]
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P a c i f i c O c e a n
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Purisima Highlands Subbasin
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Pajaro Valley SubbasinWest Santa Cruz
Terrace Basin
Santa CruzMid-County
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SantaMargarita
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0 42Miles 5
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Three eligib le a gencies in Sa nta Cruz County sub m itted b a sin b ounda ry m odific a tion requests under th eSusta ina b le Groundwa ter Ma na gement Ac t (SGMA) to Ca lifornia Depa rtm ent of Wa ter Resources (DWR)during th e first sub mitta l period ending Ma rc h 2016. DWR h a s rec om m ended a pprova l of th e m odific a tionswh ic h would result in th ree b a sins defined b a sed on th e groundwa ter resource providing supply for ea c ha gency.These m odific a tions involved sh a red b ounda ries between th e proposed b a sins. The b a sin b ounda rym odific a tions h a ve th e a dva nta ge of rem oving th e need for intra -b a sin coordina tion a greements betweenth e a gencies, but inter-b a sin coordina tion will still be necessa ry for th ese c onnec ted b a sins. Bycolla b ora tively working on th e m odific a tions of th e sh a red b a sin b ounda ries, th e a gencies h a ve ta ken g oodfirst steps for future inter-b a sin coordina tion to a c h ieve groundwa ter susta ina bility in Sa nta Cruz County.
Prepared for Poster Presentation2016 Conference & Annual MeetingSeptember 28-29, 2016Groundwater Resources Association of CA
HydroMetrics WRI work under contract to:Scotts Valley Water District (SVWD)Santa Cruz Mid-County Groundwater Agency (MGA)Pajaro Valley Water Management Agency (PVWMA)
Poster Desig n: Georgina King
Santa CruzMid-County
Basin
PurisimaHighlandsSubbasin
SantaMargarita
Basin
Final Boundary
Proposed Boundary
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Revision Based on Local InputPurisim a Mutua l Wa ter Com pa ny sub mitted a letter of opposition to SVWD a nd MGA’sproposed sh a red b ounda ry a rguing th a t it sh ould be in th e Mid-County Ba sin, not th e Sa ntaMa rg a rita Ba sin a s proposed. The a quifer units of th e b a sins overla p in th is a rea so b othpositions a re scientific a lly justified. SVWD a nd MGA colla b ora ted on a revision th a t a ddressedPurisim a MWC’s com m ents.
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Basin
Purisima HighlandsSubbasin
Pajaro Valley Subbasin
Z a ya n te
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PVWMA
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0 21Miles
Salinas Valley BasinLangley Area
Salinas Valley Basin180/400 ft Aquifer
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Boundary
Pajaro Valley Subbasin
ERevision to Monterey County SubbasinsPVWMA’s m odific a tion request defines th e Pa ja ro Va lley Sub b a sin b ounda ry b a sedon PVWMA’s jurisdiction with out crea ting new b a sins. This requires increa sing th e a reaof Sa lina s Va lley sub b a sins. PVWMA ob ta ined a letter from Monterey County Wa terResources Agency (MCWRA) during th e pub lic c om m ent period supporting th e expa nsion of th eSa lina s Va lley sub b a sins a s th e expa nded a rea s includes MCWRA’s existing m a na gement zones.!(
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Response to DWR ModificationIn a pproving th e Sa nta Ma rg a rita Ba sin, DWR origina lly proposed a m odific a tion th a t extended the b a sin down to th e existing West Sa nta Cruz Terra ce Ba sin. On beh a lf of SVWD,HydroMetrics WRI provided inform a tion a c cepted by DWR th a t limited th e south ern extent ofSa nta Ma rg a rita Ba sin. HydroMetrics WRI sug gested possib ly extending th e expec ted low priorityWest Sa nta Cruz Terra ce Ba sin north wa rd instea d. This sug gestion wa s m a de a fter consulta tion withMGA mem ber City of Sa nta Cruz, th e a gency with in West Sa nta Cruz Terra ce Ba sin.
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0 10.5Miles
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SantaMargarita
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Santa CruzMid-County
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Scientific Justification for Shared BoundarySVWD a nd MGA recog nized in ea rly pla nning th e need to coordina te b a sin b ounda rym odific a tion where a quifer units of b a sins overla p. MGA a greed with SVWD’s conceptua lproposa l to inc lude a ll a quifer units th a t provide wa ter supply to SVWD a s pa rt of th eSa nta Ma rg a rita Ba sin. Th e b ounda ry between th e two b a sins wa s th en m odified on th e scientificb a sis of a geologic struc tura l divide in th e gra nite b a sement roc k underlying th e a quifers of ea c h b a sin.HydroMetrics WRI worked with a former Sa nta Cruz County geologist to refine th e a lig nm ent of th isdivide, whic h h a d a lso been identified in previous studies of th e a rea .
A
0 10.5Miles
0 10.5Miles
Keeping Water Agencies within Single BasinsRecog nizing PVWMA’s exclusive rig h t under SGMA to be th e Groundwa ter Susta ina bilityAgency (GSA) for its jurisdiction, MGA’s request for th e Mid-County Ba sin b ounda ry wa sb a sed on PVWMA’s jurisdiction. Also, Mid-County Ba sin inc ludes the wh ole jurisdiction of MGAmem ber Centra l Wa ter Distric t (CWD) so th a t CWD is not a lso in th e Purisim a Hig h la nds Sub b a sin.The expec ted low priority of th is sub b a sin wa s c om m unic a ted to PVWMA whic h h a d not yetdecided to sub mit its m odific a tion request to prevent overla p with th is sub b a sin.
Centra l Wa ter Distric tPa ja ro Va lley Wa ter Ma na g ement Agency
Proposed Ba sin Modific a tionsPa ja ro Va lley Sub b a sinSa lina s Va lley Ba sin
2003 Hig h Priority Ba sinsPa ja ro Va lley0 21
Miles
2003 Low Priority Ba sinsSc otts Va lleyFelton
2003 Medium Priority Ba sinsWest Sa nta Cruz Terra ceSa nta Cruz Purisim a Form a tion
2003 Hig h Priority Ba sinsSoquel Va lleyPa ja ro Va lley
Sh a ded Ba sins a re 2003 DWR Ba sins.Outlined Ba sins a re Proposed Ba sins
ProcessTimeline
ECA E BA D
Ja n 2015SGMA becom esla w
Feb 2015Meeting of Agencies with DWR
Aug 2015MGA a ndSVWD begin coordina tion for sh a redb ounda ry
Sept 2015PVWMA decla resa s GSA
Oc t 2015DWR a dopts emergencyregula tions
Dec 2015MGA a nd SVWD coordina te on notice for loc a l input
Ja n 2016MGA a ndSVWDcoordina te onrevisionb a sed onloc a l input
Ma r 2016MGA & SVWDsub m it b a sinb ounda ryrequests&PVWMA initia tes & sub mitsb a sin b ouda ry request
April-Ma y 2016Agency lettersof supportprovided forPVWMA request
July 2016SVWD resposeto DWR'sm odific a tionto request forSa nta Ma rg a ritaBa sin
Sept 2016DWR to
pub lish fina lm odific a tions
June 2016MGA dec la resa s GSA
Request sub mitted by MGA predecessor Soquel-Aptos Groundwa ter Ma na gement Com m ittee. MGA mem bers a re Centra l Wa ter Distric t, City of Sa nta Cruz,County of Sa nta Cruz a nd Soquel Creek Wa ter Distric t.
1
Modified Basin Requesting AgencySa nta Ma rg a rita Ba sin Scotts Va lley Wa ter Distric t (SVWD)
Sa nta Cruz Mid-County Ba sin
Sa nta Cruz Mid-County Groundwa ter Agency (MGA)1
Pa ja ro Va lley Sub b a sin
Pa ja ro Va lley Wa ter Ma na gement Agency (PVWMA)
