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Groundwater Sustainability Plan
Workshop
December 21, 2016 23050 W. Mt Whitney Five Points, CA 93624
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GSP Development Timeline Hydrogeology Overview Cross Section Aquifer Characteristics Management Areas Geologic Characteristics SGMA’s Undesirable Results by Area Optimization Options Public Input
Workshop Outline
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May Jul Sep Nov 2017 Mar May Jul Sep Nov 2018 Mar
GSP Development Timeline
Hydrogeologic Conceptual Model Flow Model
Final Model
1st Workshop 2nd Workshop Westside Subbasin GSP
2016 2017 2018
Model/ GSP Development
Stakeholder Workshops
Management Action Options
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GSP Development Schedule Hydrogeology Overview Cross Section Aquifer Characteristics Management Areas Geologic Characteristics SGMA’s Undesirable Results by Area Optimization Options Public Input
Workshop Outline
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Located in the Western Area of the San Joaquin Groundwater Basin
Adjacent Subbasin's include the Delta-Mendota, Kings, Tulare Lake and Pleasant Valley (Starting North Clockwise)
Hydrogeology- Westside Subbasin
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Adjacent Subbasin
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Located in the Western Area of the San Joaquin Groundwater Basin
Adjacent Subbasin's include the Delta-Mendota, Kings, Tulare Lake and Pleasant Valley (Starting North Clockwise)
Topography varies by 800 feet west to east and 50 feet north to south (ground surface)
Base of Fresh Water ranges from 800 feet to 3,500 feet (below ground surface)
Hydrogeology- Westside Subbasin
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Topography and BFW
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Sierra Nevada Mountain Range (East) is the source of the younger sedimentary deposits in the Subbasin.
Diablo Range (West) is source of marine sedimentary rocks in the Subbasin.
Tulare Lake Bed is the source of the Corcoran Clay.
Hydrogeology- Westside Subbasin
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Hydrogeology- Westside Subbasin
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Shallow Aquifer-<100 feet
Hydrogeology- Westside Subbasin
3
3’
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Cross Section
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Shallow Aquifer-<100 feet
Upper Water Bearing Zone - Above the Corcoran Clay 100 feet to 800 feet
Hydrogeology- Westside Subbasin
3
3’
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Cross Section
Upper Water Bearing Zone
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Shallow Aquifer-<100 feet
Upper Water Bearing Zone - Above the Corcoran Clay 100 feet to 800 feet
Lower Water Bearing Zone - Below the Corcoran Clay 700 feet to 3,500 feet
Hydrogeology- Westside Subbasin
3
3’
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Cross Section
Upper Water Bearing Zone
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GSP Development Schedule Hydrogeology Overview Cross Section Aquifer Characteristics Management Areas Geologic Characteristics SGMA’s Undesirable Results by Area Optimization Options Public Input
Workshop Outline
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Cross Section- Western
Panoche West
Cantua West
A.P.-West
Lower Water Bearing Zone
Upper Water Bearing Zone
Upper Water Bearing Zone
Lower Water Bearing Zone
Lower Water Bearing Zone
Upper Water Bearing Zone
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GSP Development Schedule Hydrogeology Overview Cross Section Aquifer Characteristics Management Areas Geologic Characteristics SGMA’s Undesirable Results by Area Optimization Options Public Input
Workshop Outline
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Based on the variability of the three cross sections and;
Dividing the Westside Subbasin into three management areas is supported by: Corcoran Clay (Absent or
Thickness) Thickness of Freshwater
Aquifer Similar Soil Types
Management Areas
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GSP Development Schedule Hydrogeology Overview Cross Section Aquifer Characteristics Management Areas Geologic Characteristics SGMA’s Undesirable Results by Area Optimization Options Public Input
Workshop Outline
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1. Corcoran Clay Panoche West Area- Extremely thick Cantua West Area- Relatively thin to not existent A.P. West Area- Non existent
2. Soils Panoche West Area- Sandy and Clay Loams Cantua West Area- Clay, Sandy and Clay Loams A.P. West Area- Predominantly Sandy Loams
Western Area Geologic Characteristics
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Western Area Soil Textures
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1. Corcoran Clay Panoche West Area- Extremely thick Cantua West Area- Relatively thin to not existent A.P. West Area- Non existent
2. Soils Panoche West Area- Sandy and Clay Loams Cantua West Area- Clay, Sandy and Clay Loams A.P. West Area- Predominantly Sandy Loams
3. Well Drained Soils
Western Area Geologic Characteristics
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Western Area Soil Types
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1. Corcoran Clay North Western Area- Extremely thick West Central Area- Relatively thin and not existent South Western Area- Not existent
2. Soils North Western Area- Sandy and Clay Loams West Central Area- Clay, Sandy and Clay Loams South Western Area- Predominantly Sandy Loams
3. Well Drained Soils 4. Advantageous Groundwater Recharge Rates 5. The Panoche, Cantua and Arroyo Pasajero
Creeks predominantly drain into the Western area of the Subbasin
Western Area Geologic Characteristics
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Western Areas- Soil Hydraulic Conductivity
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GSP Development Schedule Hydrogeology Overview Cross Section Management Areas Geologic Characteristics SGMA’s Undesirable Results by Area Optimization Options Public Input
Workshop Outline
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Local Management of the Groundwater Basin Requires subbasins to be sustainably managed by 2040 “Sustainability” refers to any of the effects caused by
groundwater conditions occurring throughout the basin that, when significant and unreasonable, cause undesirable results.
Sustainable Groundwater Management Act
(SGMA)
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Similar Subsidence Characteristics Similar Trending Groundwater Level
Behavior Areas west of the San Luis Canal
have favorable recharge potential. Minimal or no shallow groundwater
pumping.
Western Area Characteristics- SGMA
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Western Area- Undesirable Results
Undesirable Results Risk
Reduction in Groundwater Storage Yes
Degradation in Water Quality Potentially
Land Subsidence Potentially
Chronic Lowering of Groundwater Levels Yes
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Groundwater Levels District-Wide
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Western Area- 2012 Groundwater Pumpage by Township
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Western Area- 2015 Groundwater Pumpage by Township
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GSP Development Schedule Hydrogeology Overview Cross Section Aquifer Characteristics Management Areas Geologic Characteristics SGMA’s Undesirable Results by Area Optimization Options Public Input
Workshop Outline
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Avoiding the six undesirable results identified in SGMA and optimizing pumping the Westside Subbasin
Optimization Options
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Soil Hydraulic Conductivity
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Western Area- Recharge Potential
How do we optimize the hydrogeology,
aquifer characteristics and meet the
SGMA objectives?
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GSP Development Schedule Hydrogeology Overview Cross Section Management Areas Aquifer Characteristics SGMA’s Undesirable Results by Area Optimization Options Public Input
Workshop Outline
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Groundwater Banking Projects developed by: The District
OR/AND Water Users
Groundwater Credit Options
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Aquifer Storage and Recovery (ASR) developed by: The District
OR/AND Water Users
Groundwater Credit Options
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What type of groundwater credit works best with your
farming practices?
Groundwater Credit Options
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Group the Western Area of the subbasin as: Three management areas
OR
One management area
Management Areas
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Based on farm practices, do you have suggestions or
comments on the proposed management areas?
Management Areas
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What management options would you like the District to incorporate in the GSP? 1. Flexibility to transfer Sustainable Yield
Allocation to water users in the same management area
2. Land Fallowing with Compensation 3. Public Input?
Management Options
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Are you understanding the terminology? What can we do differently from a terminology
stand point?
SGMA Terminology
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GSP IDEAS
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QUESTIONS