# Record
**Author:** @cameron.stream (`did:plc:gfrmhdmjvxn2sjedzboeudef`)

## `knowledge-paper-water-and-wet-water`
**Collection:** `site.standard.document`
**AT URI:** `at://did:plc:gfrmhdmjvxn2sjedzboeudef/site.standard.document/knowledge-paper-water-and-wet-water`

**Title:** Paper Water and Wet Water
**Published:** Thu, 03 Sep 2026 11:23:43 GMT
**Updated:** Thu, 03 Sep 2026 11:22:10 GMT
**Description:** How legal allocations, physical supply, operating rules, and consumptive use diverge in the Colorado River Basin.
**Publication:** `at://did:plc:gfrmhdmjvxn2sjedzboeudef/site.standard.publication/3mr4py6clps2f`
**Path:** /paper-water-and-wet-water
**Tags:** knowledge, concept, water, climate, infrastructure, world systems

**Content:**
```json
{
  "text": "Legal apportionments can coexist with physical shortfall in a river and its reservoirs. A legal instrument can recognize uses and obligations, but it cannot guarantee that the river, reservoirs, and infrastructure contain enough water to make every contemplated delivery.\n\nIn this article, “paper water” and “wet water” are analytical shorthand. Paper water names a use or claim recognized by a legal or administrative regime. Wet water names the physical supply present in the river and reservoirs. Deliverable water is the portion that operations and infrastructure can release and route under prevailing conditions. The distinction prevents legal specifications, physical measurements, operational records, decision rules, and consumption budgets from being treated as interchangeable accounts.\n\n## Five questions for one quantity\n\nWater quantities become confusing when the same unit answers different questions:\n\n- **Legal entitlement:** Who holds a recognized use or claim, for what amount or share, under which instrument and conditions?\n- **Hydrologic supply:** How much water does the system produce or hold during the relevant period?\n- **Operational accounting:** Which deliveries, stored quantities, and administrative categories are recognized?\n- **Operating rules:** How do physical conditions and accounted quantities determine releases, shortage triggers, and shortage distribution?\n- **Consumptive use:** How much withdrawn water remains depleted after return flows are subtracted, and which additional system losses are included in the budget?\n\nThese questions interact, but each requires its own evidence. A compact can establish an apportionment or obligation. Measurements and modeled water budgets describe physical conditions. Operational accounting records recognized deliveries, storage, and administrative categories, while operating rules use those quantities and physical conditions to determine releases and shortages. Consumptive-use accounting measures depletion within a specified budget boundary.\n\n## What the compact allocates\n\nThe [1922 Colorado River Compact](https://www.usbr.gov/lc/region/g1000/pdfiles/crcompct.pdf) identifies equitable division and apportionment of use among its major purposes and divides the system into Upper and Lower Basins. Article I says the compact makes an apportionment of the use of part of the Colorado River System’s water to each basin and allows further equitable apportionments. Article III(f) refers expressly to water left unapportioned by paragraphs III(a), III(b), and III(c), and Article III(g) describes a process for dividing that unapportioned water.\n\nWithin that limited apportionment, Article III(a) gives each basin, in perpetuity, the exclusive beneficial consumptive use of 7,500,000 acre-feet per year. Article III(b) gives the Lower Basin an additional right to increase beneficial consumptive use by 1,000,000 acre-feet per year.\n\nThe compact also specifies a flow obligation at a different time scale. Article III(d) says the Upper Division states will not cause flow at Lee Ferry to be depleted below an aggregate of 75,000,000 acre-feet over any ten consecutive years. Article VIII says present perfected rights remain unimpaired and directs that other rights to beneficial use be satisfied solely from water apportioned to the basin in which they are situated.\n\nMeasurement appears separately. Article V directs state and federal officials to coordinate facts about flow, appropriation, consumption, and use and to publish the annual flow at Lee Ferry. Taken together, these provisions distinguish legal quantities from evidence about physical performance: the compact specifies recognized uses and obligations, while observed flow measures what the system carries.\n\n## What a consumption budget measures\n\nThe [2024 accounting study](https://www.nature.com/articles/s43247-024-01291-0) compiles an average Colorado River water-consumption budget for 2000–2019. It defines consumptive use as total withdrawals minus return flows. Its direct human-use categories are agriculture and municipal, commercial, and industrial use. Its broader budget also includes reservoir evaporation and evapotranspiration from riparian and wetland vegetation.\n\nThe authors report that irrigated agriculture accounted for 74 percent of direct human consumption and 52 percent of overall consumption. In the overall budget, riparian and wetland vegetation accounted for 19 percent of consumption, while reservoir evaporation accounted for 11 percent.\n\nUnder the study’s definition, a withdrawal figure can exceed consumptive use when some water returns to the system. A delivery or withdrawal record alone therefore does not establish how much water remained depleted. The budget boundary matters as well: including reservoir evaporation and riparian or wetland evapotranspiration changes the denominator and the shares attributed to direct users.\n\nThe same study reports that total annual consumption exceeded runoff supplies in 16 of the 21 years from 2000 through 2020. It says withdrawals from Lake Mead and Lake Powell accommodated the deficits and reports an average annual overdraft of 10 percent during that period. Those findings describe the relationship between physical supply, stored water, and consumption. The status of any particular right remains a question for the governing legal instruments.\n\n## How reservoir operations mediate delivery\n\nThe [post-2026 operations narrative](https://www.doi.gov/sites/default/files/documents/2024-11/narrative-updated.pdf) presents five alternatives in advance of a draft environmental impact statement. It describes a goal of coordinated management of Lake Powell and Lake Mead across their full operating range under a wide range of potential future system and hydrologic conditions. Because the document presents alternatives for analysis before the draft environmental impact statement, it does not establish that any one alternative became the final rule.\n\nAcross all alternatives, the narrative warns that releases from Lake Powell may fall below a specified release when elevation is below 3,490 feet because of Glen Canyon Dam infrastructure limitations. It also says additional Lower Basin shortages, along with potential additional reductions in deliveries to Mexico, may be necessary in scenarios where Lake Mead reaches dead pool.\n\nThe alternatives show how physical state can enter a decision rule. Alternative 2 would determine Lake Powell releases using Lake Powell and Lake Mead elevations, ten-year running-average hydrology, and Lower Basin deliveries. It would trigger shortages using combined storage and distribute them pro rata. Alternative 4 would analyze shortage distribution under both priority and pro-rata approaches.\n\nThe alternatives also separate accounting mechanisms from release and shortage rules. The No Action alternative and Alternative 1 would deliver existing Intentionally Created Surplus under existing agreements and create no new delivery and storage mechanisms. Alternative 1, Alternative 2, and Alternative 4 call for explicit accounting of unused or undeveloped quantified Tribal water. Alternatives 2 and 4 would also add new delivery and storage mechanisms.\n\nThe narrative’s accounting provisions concern recognized ICS deliveries, delivery and storage mechanisms, and explicit accounting of unused or undeveloped quantified Tribal water. Its operating rules use physical conditions and administrative quantities to determine releases, shortage triggers, and shortage distribution. The proposals therefore treat operational accounting and operating rules as connected but distinct parts of reservoir management.\n\nThe alternatives support a further operational inference. Because different formulas can act on the same reservoir and hydrologic conditions, operating rules could change actual deliveries without amending the underlying compact.\n\n## Following one claim through the system\n\nConsider a hypothetical holder of a recognized claim. The legal inquiry begins with the instrument creating or preserving that claim. The supply inquiry asks what water is physically present over the relevant period. The operational-accounting inquiry determines which deliveries, stored quantities, and administrative categories are recognized. The operating-rule inquiry applies physical and accounted quantities to release and shortage decisions. The consumption inquiry then subtracts recognized return flows and includes any indirect losses inside the selected budget.\n\nIf reservoir conditions trigger a lower release, evidence of reduced delivery answers an operational question. Deciding the claim’s legal status still requires the governing instrument. A full withdrawal can also produce a smaller consumptive-use figure when the accounting method recognizes return flows. These are different observations about the same water system rather than rival measurements of one undifferentiated object.\n\nA useful reading discipline is to attach a noun and time scale to every number:\n\n- Is it an annual apportionment, a ten-year flow obligation, a reservoir release, a delivery, a withdrawal, stored water, or consumptive use?\n- Does it describe a legal specification, a measured or modeled result, an operational-accounting entry, or a proposed operating rule?\n- Which reservoir conditions, infrastructure limits, return flows, evaporation, and ecological consumption are inside the relevant account?\n- How is the quantity recorded, and which rule uses it to determine a release or shortage?\n- Which priority or pro-rata rule distributes a shortage once the physical mismatch appears?\n\nComparing legal quantities, physical measurements, operational accounts, and consumption budgets can expose a mismatch among recognized uses, supply, deliveries, and depletion. The compact and the proposed operating alternatives show that legal instruments and operating rules govern different parts of how a resulting shortage is assigned.\n\n## Sources\n\n- [Colorado River Compact, 1922](<https://www.usbr.gov/lc/region/g1000/pdfiles/crcompct.pdf>)\n- [Post\\-2026 Colorado River alternatives narrative](<https://www.doi.gov/sites/default/files/documents/2024-11/narrative-updated.pdf>)\n- [New water accounting reveals why the Colorado River no longer reaches the sea](<https://www.nature.com/articles/s43247-024-01291-0>)",
  "$type": "site.standard.content.markdown",
  "version": "1.0"
}
```

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