Water Allocation and Curtailment
Definition
A water allocation is the percentage of a contract or entitlement that a water project or irrigation district will actually deliver in a given year, set from reservoir storage, snowpack and forecasts. A curtailment is a regulatory order to stop or reduce diversions under a water right because there is not enough water for all rights; in California the State Water Resources Control Board says it 'can restrict water use by curtailing water rights based on priority,' and that 'more recent permitted rights must be curtailed if conditions are dry and senior water rights holders will not get their allocated water.' Both turn a paper water supply into a smaller real one. For a farm, a cut means fallowing land, pumping more groundwater at higher cost, buying water on the spot market, or accepting lower yields.
Why it matters
Irrigated farmland is priced in normal years and tested in dry ones. California's State Water Board records that the water year ending September 30, 2022 closed 'the driest three year period on record,' and in that period federal irrigation deliveries fell to zero for many contractors. Permanent crops cannot be fallowed for a year without losing the planting, so an orchard farm on a cut surface supply has to find water at almost any price. An offering that shows only normal-year water costs and yields has not been stress-tested. Investors should ask how the farm got through 2021 and 2022, and what it would do if the main supply were cut by half or entirely.
Common misconceptions
- •A contract quantity is not a delivery. Allocations are set each year and can be zero.
- •Senior rights are not untouched in every drought, but they are cut last.
- •Groundwater cannot always fill the gap. Well capacity, basin rules and pumping costs limit it.
- •Permanent crops cannot simply be fallowed. Losing a year's water can mean losing the trees.
- •Fixed cash rent does not remove water risk from the landowner. It moves it to the tenant until the tenant cannot pay.
Technical details
Worked stress test (AltStreet illustration, assumed figures)
Farm: 300 acres of orchard needing 3.5 acre-feet per acre, 1,050 acre-feet a year; normally 630 from a district and 420 from wells; wells can pump up to 800 acre-feet; assumed pumping cost $150 per acre-foot.
Full allocation: 630 district plus 420 pumped; need met in full.
50% allocation: 315 district plus 735 pumped; need met, extra pumping cost about $47,250.
0% allocation: 0 district plus 800 pumped (capacity); 250 acre-feet short, 24% of need unmet; extra pumping cost about $57,000, plus deficit irrigation or water purchases.
Landlord impact: under cash rent, the tenant absorbs the cost and the yield loss, testing its ability to pay; under a crop share, the landowner's share of the crop falls with yield.
Central Valley Project, initial 2022 allocations (Reclamation, February 23, 2022)
Irrigation water service and repayment contractors north and south of the Delta: 0% of contract total.
South-of-Delta municipal and industrial contractors: 25% of historical use.
Sacramento River Settlement Contractors and San Joaquin River Exchange Contractors (supply based on senior water rights): critical-year amounts under their contracts.
Friant Division: 15% of Class 1, 0% of Class 2.
Questions for an irrigated farm
What were the farm's deliveries and pumping in 2021 and 2022?
What share of its water comes from each source and each right?
How much groundwater can it pump, and is the basin limiting pumping?
What is the plan, and who pays, in a 0% year?
How investors apply the term
Investors usually apply this term by tying the definition back to the controlling documents and then asking which cash flows, rights, restrictions, or valuation assumptions it changes. A useful review looks at the term alongside fees, leverage, liquidity, reporting frequency, and manager discretion rather than treating it as a standalone concept.
The practical diligence test is simple: identify who benefits if the assumption is wrong, who has control when conditions change, and what evidence the investor receives after closing. Terms that cannot be reconciled to documents, cash movements, and monitoring data should be treated as marketing shorthand until proven otherwise.
Frequently asked questions
- Can a water allocation really fall to zero?
- Yes. On February 23, 2022, the Bureau of Reclamation announced initial 2022 Central Valley Project allocations of 0% of contract totals for irrigation water service and repayment contractors both north and south of the Delta. In the same release, contractors whose supply rests on settlements of senior water rights received the critical-year amounts in their contracts, and Friant Division contractors received 15% of Class 1 and 0% of Class 2.
- What is the difference between an allocation and a curtailment?
- An allocation is a delivery decision by the supplier under a contract: the district or project tells contractors what share they will get. A curtailment is an order by the regulator limiting diversions under water rights, by priority. A farm can be hit by either, or both.
- Does a curtailment affect a landowner who collects cash rent?
- Not directly in the year it happens, if the rent is fixed and the tenant pays. But the tenant bears higher pumping or water costs and lower yields, which can lead to late rent, a request for relief, or a lower rent at renewal. A landowner on a crop share or a flexible lease shares the loss at once.
- How can an investor stress-test a farm for water cuts?
- Model the farm's water demand, the share from each source, and what happens at reduced allocations: how much groundwater can replace surface water, at what pumping cost, and how much land would be fallowed. Then trace the effect on the tenant's margin and the rent. The worked example below shows the method.