Sustainable Groundwater Management Act Update August 13, 2020 What Do We Have to Do? • Partner with other GSAs in the basin • Engage with stakeholders (nasbgroundwater.org) • Fill data gaps • New monitoring wells • Collect water quality information • Collect surface water data • Develop tools • Regional database system Avoid Six Undesirable Results • Regional groundwater model • Prepare a GSP (and then implement it)
Why Model is Essential GSP Components Need for Model Description of Past and Current Conditions Used for total water budget and sustainable yield estimates Projected future (50 years) – Based upon planned Used to project if there are water budget deficits in development, agricultural projections, and future the future climate conditions Sustainable Management Criteria (SMC) Assists developing SMCs for water levels, groundwater in storage, and stream depletion Description of monitoring network used to evaluate Can fill in estimates of where data do not exist or SMC identify where future data should be collected Projects and Management Actions Evaluate benefits of proposed projects and management actions Regional CoSANA Model Update • 24,171 elements • Average element size = 37 acres • 86 subregions • 5 layers • Calibration period 1990-2018 • 563 calibration wells
Model Layering Folsom Dam Sacramento River Mehrten Laguna Alluvium A’ A East West Valley Springs Ione Key Points for Stakeholder Engagement Review water Public Draft budget and start of GSP – development of summer of SMCs – fall 2020 2021 Draft of SMCs – winter of 2021
Groundwater Management Program Update August 13, 2020 Hydrologic Conditions Unimpaired Inflow to Folsom Reservoir 4,000 Calculated Flow in Thousand Acre-Feet • Data from 3,500 Department of 3,000 Water Resources Series2 2,500 and Water Forum Wet 2,000 • 2000 through 2020 average is 1.7 million 1,500 Average acre-feet 1,000 Dry 500 Driest - 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 Year
30 MW - 6 25 20 15 10 5 0 -5 -10 -15 -20 1/1/2012 12/31/2012 12/31/2013 12/31/2014 12/31/2015 12/30/2016 12/30/2017 12/30/2018 12/30/2019 12/29/2020 30 MW - 4 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30 1/1/2012 12/31/2012 12/31/2013 12/31/2014 12/31/2015 12/30/2016 12/30/2017 12/30/2018 12/30/2019 12/29/2020
10 MW - Chuckwagon 5 0 -5 -10 -15 -20 -25 -30 -35 -40 1/1/2012 12/31/2012 12/31/2013 12/31/2014 12/31/2015 12/30/2016 12/30/2017 12/30/2018 12/30/2019 12/29/2020 10 MW - N28 5 0 -5 -10 -15 -20 -25 -30 -35 -40 1/1/2012 12/31/2012 12/31/2013 12/31/2014 12/31/2015 12/30/2016 12/30/2017 12/30/2018 12/30/2019 12/29/2020
10 MW Lone Oak 5 0 -5 -10 -15 -20 -25 -30 -35 -40 1/1/2012 12/31/2012 12/31/2013 12/31/2014 12/31/2015 12/30/2016 12/30/2017 12/30/2018 12/30/2019 12/29/2020 30 25 MW - AB4 20 15 10 5 0 -5 -10 -15 -20 1/1/2012 12/31/2012 12/31/2013 12/31/2014 12/31/2015 12/30/2016 12/30/2017 12/30/2018 12/30/2019 12/29/2020
Example Transfer Monitoring Well Hydrographs Draft July Results in Acre-Feet 2020 Groundwater Substitution Transfer Groundwater Elevation (feet) -40 -38 -36 -34 -32 -30 -28 -26 -24 -22 -20 4/27/2018 2018 high Spring 5/27/2018 2018 low Summer 6/27/2018 7/27/2018 8/27/2018 9/27/2018 10/27/2018 11/27/2018 12/27/2018 1/27/2019 2019 high Spring 2/27/2019 3/27/2019 SSWD MW-5 4/27/2019 5/27/2019 2019 low Summer 6/27/2019 7/27/2019 8/27/2019 9/27/2019 10/27/2019 11/27/2019 12/27/2019 1/27/2020 2020 high Spring 2/27/2020 3/27/2020 4/27/2020 5/27/2020 6/27/2020 7/27/2020 8/27/2020 (2) Represents July 8 through July 31 (1) Represents July 7 through July 31 Suburban Sac (2) Sacramento City of WD Fair Oaks WD (1) Carmichael Agency Groundwater Elevation (feet) -10 10 -8 -6 -4 -2 0 2 4 6 8 3/15/2018 2018 high Spring 4/15/2018 5/15/2018 6/15/2018 7/15/2018 2018 low Summer 8/15/2018 9/15/2018 918 756 118 327 Pumping Base 10/15/2018 11/15/2018 12/15/2018 2019 high Spring 1/15/2019 CWD Winding Way 2/15/2019 3/15/2019 4/15/2019 5/15/2019 1367 726 186 127 Pumping Additional 6/15/2019 7/15/2019 2019 low Summer 8/15/2019 9/15/2019 10/15/2019 11/15/2019 12/15/2019 1/15/2020 2020 high Spring 2,285 1,482 304 454 Pumping Total 2/15/2020 3/15/2020 4/15/2020 5/15/2020 6/15/2020 7/15/2020 8/15/2020
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