Water Allocation Strategies in Sustainable Groundwater Management
The Rosedale-Rio Bravo Water Storage District implements water allocation strategies for sustainable groundwater management, supplying 116,000 Acre Feet (AF)/year on average. Allocation is proportional to acreage, with a proposed allocation of 0.5 AF/Acre. Water budgeting involves accurate data, with water demand calculated based on Evapotranspiration data and metering. Deficits are billed at a replacement water rate to ensure balanced water budgets.
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Presentation Transcript
Water Allocation Strategies In the context of the Sustainable Groundwater Management Act 30S/25E-16L GS Elevation 304 304 0 284 20 264 40 244 60 224 80 204 100 Depth to Groundwater (feet) Feet Above Mean Sea Level 184 120 164 140 144 160 124 180 104 200 84 220 64 240 44 260 24 280 Kern Fan Monitoring Report 4 300 Jan- 87 Jan- 88 Jan- 89 Jan- 90 Jan- 91 Jan- 92 Jan- 93 Jan- 94 Jan- 95 Jan- 96 Date Jan- 97 Jan- 98 Jan- 99 Jan- 00 Jan- 01 Jan- 02 Jan- 03 Jan- 04 Jan- 05 285'-345 515'-555' 654'-690' 100'-130'
Rosedale-Rio Bravo Water Storage District Water Allocation Strategies District is 44,000 acres Approximately 9,000 acres of urban development Remainder is agriculture predominately almonds 100% groundwater pumping to meet overlying demands Balanced Water Budget = Sustainable Projected minor overdraft Within critically overdrafted basin Lands less than 10 acres and Zoned Residential or Commercial are exempt from water budget
Water Budgeting requires Accurate Data!! Water Supply Water Demand APN Based Water Budget Platform (Landowner Access) Water Trading Billing Open & Transparent
Rosedale-Rio Bravo Water Storage District Water Allocation Strategies Water Supply Project Supplies 116,000 Acre Feet (AF)/year on average. Allocated to each APN within the district proportional to acreage. 116,000 AF / 44,000 Acres = 2.63 AF/Acre Allocation Groundwater Subject of current basin discussions Proposal to allocate .5 AF/Acre Water Supply Allocation (assuming 1 acre) = 2.63+.5 =3.13 Deposit is made into landowner APN each January 1
Rosedale-Rio Bravo Water Storage District Water Allocation Strategies Water Demand Demand on each APN is calculated using Evapotranspiration data Data is collected every few (5-11) days Data is interpolated between images Calibration is critical to ensure field level accuracy Landowner may utilize well head metering Demand is computed over the course of the calendar year and is basis for water budget. January 1 December 31 ET demand is debited From initial deposit No Carry-Over Balance is re-allocated amongst all users proportional to acreage Deficit is billed at replacement water rate
Rosedale-Rio Bravo Water Storage District Water Allocation Strategies District Info Landowner Access (Unique APN Log-in) Updated accounting of Supplies and Demands for decision making Water District Information Water Levels SGMA compliance data Other? Water Supply Water Demand APN Based Water Budget Platform
Rosedale-Rio Bravo Water Storage District Water Allocation Strategies Water Trading Trading Platform (Link on Water Budget Platform) for Buyers and Sellers to Post APN Based Transaction outside of platform landowner driven Transaction confirmed by individual log-in to platform and selecting APN and quantity of water to be transferred Trading requires evaluation of groundwater transfers in the context of SGMA.
Rosedale-Rio Bravo Water Storage District SGMA Compliance Strategy Water Exchange Markets Groundwater Transfers Part of the GSP Water is an asset if it can be managed. It can be a liability if stranded. Failure to accommodate groundwater transfers will exacerbate SGMA economic impacts. Groundwater transfers should be evaluated in the context of the Groundwater Sustainability Planning process Projected future deficit in Rosedale Empower Landowners!
Rosedale-Rio Bravo Water Storage District SGMA Compliance Strategy Water Exchange Markets Groundwater Transfers Part of the GSP What needs to be done to ensure Groundwater Transfers are part of the SGMA Strategy? Groundwater modeling to evaluate potential impacts Evaluation of hydraulic gradients Evaluation of water quality Evaluation of water level data with and without transfers Potential limits on amount that can transferred annually Potential limits on distance a transfer can be accommodated Ratios for greater distances Potential concerns may be addressed through information and analysis. System of accounting!
Rosedale-Rio Bravo Water Storage District SGMA Compliance Strategy Water Exchange Markets Groundwater Transfers Part of the GSP GSP Landowner Initiated Actions Within Rosedale Landowners can aggregate lands (within Rosedale) to manage supplies (Groundwater Transfer) Landowners can lease ground from others to augment supplies (Groundwater Transfer) Landowners can voluntarily reduce demand (Fallowing) Landowners can acquire additional supplies If Landowner chooses not to implement the above then .
Rosedale-Rio Bravo Water Storage District SGMA Compliance Strategy Water Exchange Markets Groundwater Transfers Part of the GSP GSP - Rosedale Initiated Actions Assessment of Water Charge or a Tiered Rate for use above Sustainable Yield Reserved by District - Economy of scale / aggregate supply needs Every five (5) years District will utilize water charge revenues to implement the most cost effective management action: New water supply projects/ programs Demand reduction (willing sellers!) in areas of potential recharge (double benefit) (Groundwater Transfer) Demand Reduction (Groundwater Transfer) Water Charge rate will adjust to reflect least cost management action!
Rosedale-Rio Bravo Water Storage District SGMA Compliance Strategy Water Exchange Markets Groundwater Transfers will be part of SGMA strategy Delay in accommodating groundwater transfers will result in economic impacts GSP s should evaluate the impacts of groundwater transfers to prevent or limit Undesirable Results
Sustainable Groundwater Management Act & Groundwater Transfers QUESTIONS 30S/25E-16L GS Elevation 304 304 0 284 20 264 40 244 60 224 80 204 100 Depth to Groundwater (feet) Feet Above Mean Sea Level 184 120 164 140 144 160 124 180 104 200 84 220 64 240 44 260 24 280 Kern Fan Monitoring Report 4 300 Jan- 87 Jan- 88 Jan- 89 Jan- 90 Jan- 91 Jan- 92 Jan- 93 Jan- 94 Jan- 95 Jan- 96 Date Jan- 97 Jan- 98 Jan- 99 Jan- 00 Jan- 01 Jan- 02 Jan- 03 Jan- 04 Jan- 05 285'-345 515'-555' 654'-690' 100'-130'
