Revised 1/23/04

This document explains the storage water reporting under the Utah Lake Distribution Plan. Operation under the Distribution Plan is based on water water right priorities and the guidelines established under the 1994 Deer Creek Reservoir/Jordanelle Reservoir Operating Agreement. The report format was updated in year 2000, and some of the following definitions apply to items in the latest format. This document is intended to answer questions and explain the items reported. Questions or comments may be directed to Ben Anderson, Utah Division of Water Rights, phone (801) 538-7469. Return to Index.

Distribution Year :
The reports are year-to-date totals reported at the ending of each month. They are based on daily data that are average daily deliveries or the storage volumes existing at the end of each day. The Distribution Year is November 1 - October 31 (inclusive). This represents conditions at midnight (end of October and the beginning of November). This time period corresponds to the time period reported by the Provo River Commissioner and Spanish Fork River Commissioner. The Weber, Duchesne, and Utah Lake/Jordan River water commissioners report on a calendar year basis, so their reported annual totals are not necessarily the same as those reported here. The water year used by national agencies runs October 1 - September 30. The use of different annual time periods has not interfered with this report, but it is important to know the reference periods when annual totals are reported.

Compilation Date :
The compilation date is the day the report was compiled/generated from the data in the Division's database. Data and accounting/reporting are subject to future corrections. Later report versions include the latest data and/or program revisions. If there are no program or data revisions, a new compilation should produce the same report.

JORDANELLE RESERVOIR:

There is one critical element necessary to understand the Jordanelle Reservoir storage included in these reports. The Morse Decree established a 4% loss to be assessed on all storage/import releases above Heber Valley. Therefore, there is not a 1:1 relation between storage in Deer Creek Reservoir (flow on the lower Provo River) and Jordanelle Reservoir (Upper Provo River). After reviewing the alternatives, it was decided to create a 4% reserve account consisting of 4% of the storage contents of Jordanelle Reservoir. Whenever water is stored, 4% of the amount stored enters the Reserve Account and 96% is identified as new storage under the appropriate source line in the reports. Likewise, whenever 100 ac-ft of water is used, the net (after loss) amount used (96 ac-ft) is reported as use (delivered to the user) and the 4% loss (4 ac-ft) comes from the Reserve Account. The Jordanelle storage less the Reserve Account is now in the same units (1:1 relation) as Deer Creek Reservoir and Utah Lake. This framework enables water exchanges between Jordanelle and Deer Creek reservoirs and in some cases Utah Lake because Jordanelle Reservoir storage is now reported in Deer Creek Reservoir units. The storage reported in the different accounts represent "net" units or water that is available to downstream storage users after the 4% loss. The amount released is always "gross" units (the amount delivered divided by 0.96) and the 4% makes up the transmission losses required by the decree.

The above method of reporting has benefits that outweigh two errors/limitations that need to be understood in order to interpret the reports correctly. One is that the reported Jordanelle Reservoir evaporation losses represent the net (96%) of the actual reservoir evaporation. The remaining 4% of the evaporation is supplied by the 4% Reserve Account. In order to obtain the total reservoir evaporation for a given time period, the reported (net) evaporation must be divided by 0.96. This same concept applies to other uses from the different reservoir accounts and does not adversely impact any account or user, but enables the reported entries within the report to balance. The other limitation is that the inactive storage is also partly in the Reserve Account. Part (2905 ac-ft) of the inactive storage is within the CUWCD balance carried forward from the previous year, and the balance (121 ac-ft) is in the Reserve Account, for a total of 3026 ac-ft of inactive storage. All Jordanelle storage water use is reported as net use (96 percent of release) and the 4% loss is released from the Reserve Account to make up the transmission loss. When water is exchanged out of Jordanelle the 4% reserve remains in Jordanelle to provide the 4% loss associated with the release of water exchanged into the reservoir.

WCWEP : Wasatch County Water Efficiency Project account in Jordanelle Reservoir (JL)
This is the net amount (after 4% loss) of water stored under water right change applications filed by the canal companies participating in the Wasatch County Water Efficiency Project. The CUWCD insisted on paying the evaporation losses associated with this account.

USBR : United States Bureau of Reclamation account in Jordanelle Reservoir (JL)
This is the net amount (after 4% loss) of water stored under change applications filed by the USBR to store the water previously used to irrigate the land inundated by the reservoir. This USBR account is now being used to supply water to Jordanelle Wetlands, which were constructed in connection with Jordanelle Reservoir to mitigate for reduced riverine habitat and are located downstream of Jordanelle Dam. Evaporation losses are assessed to this account based on the balance. It is independent of the CUWCD's account. During periods of time when the balance is negative the evaporation is reduced and water is essentially borrowed from the CUWCD account at the expense of the CUWCD. For more information on the USBR, see www.uc.usbr.gov

HORS : Head of River Storage account in Jordanelle Reservoir
When Jordanelle Reservoir (JL) was constructed, many of the small reservoirs in the upper river drainage were stabilized and the water rights were moved to JL. Whenever Head of River Storage (HORS) water is used, it comes from this account in JL. Water is also transferred into this account each year depending on how much water is stored in Washington Lake. The three reservoirs remaining in operation (operated by the CUWCD) are Washington, Trial, and Lost. The numbers reflect the net amount (after the 4% loss) stored/used.

PRWUA : Provo River Water Users Association
The PRWUA is a non-profit water user company that operates Deer Creek Reservoir (DC), the Weber-Provo Canal and Duchesne Tunnel transbasin diversions, and the Murdock Canal (Provo Reservoir Canal) and Salt Lake Aqueduct Provo River diversions. The PRWUA is not the same as the Provo Reservoir Water User Company (PRWUC), who own some PRWUA shares. PRWUC and PRWUA use the Murdock Canal and the Weber-Provo Canal. For more information, see www.prwua.org

CUWCD : Central Utah Water Conservancy District
The CUWCD is a multi-county public water agency/entity charged with completing and operating the Central Utah Project. CUWCD operates Jordanelle Reservoir, Washington, Trial, and Lost lakes (operable headwater reservoirs), Olmsted Diversion and Flowline, Strawberry Tunnel, Syar Tunnel, and other facilities. CUWCD operates various SCADA telemetry stations to obtain and report hydrologic data. The CUWCD's storage account in JL summarizes the net (after 4% loss) water stored and used under the CUWCD's water rights owned by the USBR. For more information on the CUWCD, see www.cuwcd.com

PRIORITY STORAGE:
Priority Storage is storage not subject to calls by downstream rights under the Utah Lake Distribution Plan.

Balance from Previous Year
The distribution/storage year begins November 1. The end-of-day balance on October 31 is carried over to the new year as the starting point for the November 1 data to be applied. It does not include the 4% in the Reserve account, which is reserved (and carried forward also) to supply the transmission losses associated with storage used. It includes 96% (2905 Ac-ft) of the inactive storage (3026 Ac-ft). Note that 4% (121 Ac-ft) of inactive storage is also included under the Reserve Account. The 4% is removed in order to report Jordanelle Reservoir storage in "after-loss" units equivalent to Deer Creek storage units as explained above.

BU Imports from Upper Lakes
This is storage water transferred (imported) to Jordanelle Reservoir from Washington, Trial, and Lost Lakes on the Upper Provo River. All other headwater lakes are no longer used as storage reservoirs. Water stored in the operable reservoirs is stored under the original storage rights, but most all of this is now available as CUWCD project water to users above Jordanelle or used as exchange water to enable delivery of PRWUA storage to the same users. Contracts have been or will be entered between CUWCD, USBR, and the owners of the HORS storage waters to authorize CUWCD's use of water stored in the operable lakes. The quantity of water reported here is representative of the net amount of storage water entering Jordanelle from the three operable lakes. Note that 4% of the imported water enters the JL Reserve Account to make up the transmission loss. What is reported here is 96 percent of the gross amount released from the upper lakes, even though 100% of the water enters Jordanelle Reservoir.

HORS Change Applications
This is Head of River Storage (HORS) upper lakes water stored in Jordanelle Reservoir under approved change applications. 96% of HORS storage thus stored is credited directly to the HORS account here. The remaining 4% is credited to the JL Reserve Account to make up the 4% transmission loss when HORS storage is released. The amount reported depends on the amount of water stored in Washington Lake as defined in contracts with HORS storage owners.

Transfer HORS Spill to BU
Under contracts, the owners of the original HORS storage rights are able to store the unused portion of their storage water in Jordanelle Reservoir on a space available basis. When there is not space for the holdover, it is transferred under contract to the CUWCD as Bonneville Unit (BU) water and entered here. The amount transferred depends on how much HORS holdover is present when space is no longer available. Once transferred, the water may not necessarily spill, depending on how much spills, but only CUWCD spills need to be reported. As usual, the amount reported here does not include the 4% in the Reserve Account.

Transfer BU to HORS
Each year a block of CUWCD Bonneville Unit (BU) storage water is transferred to the HORS Account in JL. The quantity transferred is keyed to how much water could have been stored in the upper lakes based on how much water is stored in Washington Lake. As usual, the 4% loss associated with this storage is in the JL Reserve Account so the amount reported is the usable storage after the loss. CUWCD indicated that when JL fills, 4599 ac-ft gross (4415 ac-ft net 96%) is transferred from CUWCD's water to the HORS account.

Sources Change Applications
The storage under change applications associated with each account. The USBR storage is under change applications a17707 & a19213, which was water used on lands inundated by Jordanelle Reservoir. The HORS account represents net water stored under the applications that were moved to Jordanelle. The net amount (96%) of the water stored under these applications is reported on this line and the remaining 4% is stored under the Reserve Account to provide the 4% loss upon release of storage.

CUWCD Duchesne River Flood
There have been years when Duchesne River water is stored in Jordanelle Reservoir by the CUWCD as part of an effort to help alleviate flooding on the Duchesne River. As usual, 4% of whatever water is stored enters the JL Reserve Account.

Converted (E398 Replacements)
Water stored under E398 and A40523 when replacements are made in Utah Lake. The 1994 DC/JL Operating Agreement outlines when this exchange can occur. 4% is in the JL Reserve Account.

Converted (Conversion Criteria)
Water originally stored as System Storage, and later converted to Priority Storage under the criteria outlined in the State Engineer's Utah Lake Water Distribution Plan. 4% is in the JL Reserve Account.

Exchange of PRWUA Imports
This line was added to report year 2001. The CUWCD System Storage balance in Deer Creek was zero and the exchange of Duchesne import water continued. CUWCD Priority Storage was exchanged upstream after the System Storage was all exchanged. Alternatively, import water could have been released from Jordanelle by the Commissioner. It doesn't appear that such exchange of Priority Storage is addressed in the operating agreement.

Exchange of PRWUC Imports
Added to report in year 2000. This is Provo Reservoir Water User Company Echo Storage and A9580 imports exchanged down to Deer Creek Reservoir with CUWCD storage stored in Deer Creek. A four percent reserve is retained in Jordanelle. The Echo Storage or A9580 import water is stored in Jordanelle Reservoir as Priority Storage and Priority Storage is released from Deer Creek (DC) to supply PRWUC users downstream. There is no water right approved for such exchange. PRWUC or other entities objecting to this exchange should contact the commissioner. Those entities supporting this exchange should file a water right application.

Wasatch Division Use
Water from Jordanelle Reservoir used in and above Heber Valley. The water sources are defined at the time the water is delivered, and database stations were created to identify the use that is from Jordanelle. The JL Reserve Account provides the 4% loss associated with these uses/exchanges.

Release to Deer Creek
Jordanelle Reservoir CUWCD storage water released to Deer Creek Reservoir. This is the net amount released. The Reserve Account provides the 4% loss. Whenever CUWCD storage water from Jordanelle Reservoir is used below Deer Creek Reservoir, it is first released to Deer Creek Reservoir. The HORS Account storage water used below Deer Creek is also reported here but it flows through Deer Creek to the Provo Division users.

Spill
Storage Water released that is available to the next downstream appropriator. As usual, 4% of the spilled water comes from the Reserve Account so the net amount spilled must be divided by 0.96 to obtain the gross amount of storage spilled.

Evaporation
Evaporation losses are distributed based on storage balances at the end of the previous day. 4% of the total reservoir evaporation is supplied by the JL Reserve Account so the amounts reported on this line will always total 96% of the total JL evaporation. The CUWCD indicated they are to pay the evaporation losses associated with the portion of the HORS account that is not HORS Carryover, so the HORS evaporation represents only the portion associated with HORS Carryover. The CUWCD also insisted they pay the evaporation on the WCWEP water, so it is included under the CUWCD's evaporation balance.

Priority Storage Balance
This shows the net acre-feet in each storage account at the end of the time period identified in the report. All uses, transfers, spills, exchanges, evaporation losses, transmission losses (in the Reserve Account), etc. have been accounted for. This amount is deliverable to the water users points of rediversion.

SYSTEM STORAGE:
Storage subject to call under the Utah Lake Distribution Plan by downstream water users with prior rights. Note that the amounts reported here are the net amounts available after the 4% transmission loss.

Olmsted Water (System 1)
Water stored in JL subject to the 229 cfs and 200 cfs Olmsted Power rights. Because a 4% loss must be assessed to water stored in JL to deliver such water to the Power Plant, 4 ac-ft of water is stored in the JL Reserve Account for every 96 ac-ft of net Olmsted Water reported here. The 4% is stored in the JL Reserve as a essential distribution practice to enable the amount of water stored to be available to satisfy the rights downstream. When 96 ac-ft of JL storage is used, 4 ac-ft is released from the Reserve Account to satisfy the 4% transmission loss requirement. The water reported here, along with the 4% stored in the Reserve Account is stored under other water rights, such as A40523, and is junior to all prior downstream rights.

Non-Olmsted
This is the net Provo River natural flow water stored in JL that is in excess of the Olmsted Power Rights. The amount reported is the net amount (available at Deer Creek Reservoir after the 4% transmission loss). Non-Olmsted water consists of what is commonly reported as System 2 (PRWUA water immediately exchanged down to DC with CUWCD water), System 3 (water that is not immediately exchanged down to DC and it is not yet known who will store it), and System 4 (water stored by CUWCD as BU water). Like System 1, whenever System 2, 3, or 4 is stored, 4% of the total water stored enters the JL Reserve Account and the net amount (less the 4% loss) is reported here. The 4% in the Reserve Account is stored under the same water rights as the Non-Olmsted water reported here, and is necessary to quantify the water available at the appropriate downstream location, such as Deer Creek Dam.

Exchange of System Storage
This is System Storage 2 that is exchanged down from Jordanelle Reservoir to Deer Creek Reservoir with CUWCD storage (likely System 1) already stored in Deer Creek. When such exchange occurs, the 4% Reserve associated with the water stored in Jordanelle remains in JL to supply the loss associated with the water exchanged up, even though they might be stored under different water rights.

Exchange of PRWUA Imports
Weber Canal and/or Duchesne Tunnel PRWUA storage water exchanged down to Deer Creek Reservoir with CUWCD System Storage (likely System 1) stored in Deer Creek. When Imports are exchanged down from JL, 4% of the imports remain in JL Reserve Account to make up the 4% transmission loss when the JL storage is used or released.

Converted (E398 Replacements)
System Storage converted to Priority Storage. Defined above.

Converted (Conversion Criteria)
System Storage converted to Priority Storage. Defined above.

Called Downstream by Prior Rights
If Jordan River/Utah Lake rights are not satisfied due to storing water in Jordanelle, the water stored in JL is subject to be called upon to satisfy those prior rights. In year 2000 this line reports the net System Storage released to be stored under PRWUA rights in Deer Creek, which are also senior to storage in Jordanelle as defined under the 1994 Operating Agreement.

System Storage Balance
System Storage subject to call under the Utah Lake Distribution Plan.

TOTAL STORAGE
Total storage in the preceding JL storage accounts. Note that this total doesn't include the 4% Reserve Account, so the amount reported here (less the 2905 ac-ft net inactive) is the amount available to the users points of rediversion on the last day of the reporting period.

Reserve Balance
4% of all water stored in Jordanelle Reservoir under valid water rights and exchanges enters this Reserve Account. The Reserve Account is used to enable Jordanelle Reservoir Storage to be accounted in Deer Creek Reservoir and Utah Lake units so that exchanges and releases can be reported in terms of downstream storage. Whenever storage is released from Jordanelle, the required 4% transmission loss is supplied by this Reserve Account. Whenever storage is exchanged with DC, the portion in the Reserve Account remains in JL to provide the 4% transmission loss on the storage exchanged upstream from DC. The Reserve Account was proposed by the Commissioner and adopted under the authority of the State Engineer for distribution and reporting purposes. Its primary purpose is to enable Jordanelle Reservoir storage to be reported in downstream (after loss) units. The total Reserve Balance is always 4% of (Total Storage + Reserve Balance).

Regulation Balance
The Commissioner balances storage and use with the daily reservoir contents. He uses the regulation balance to make up any differences between the natural flow available and the amount delivered to the water user diversions. If he delivers storage water to prior direct flow rights, the regulation balance decreases. If he stores water that should be bypassed to prior rights, the regulation balance increases. He doesn't have space for his regulation balance when Jordanelle is full. Any errors associated with measuring the daily reservoir content are typically corrected or reflected in the use of the regulation balance (see below). The balance reported here started on November 1, 1993, and is carried over each year.

Error Balance
When the data entered in the Division's Database doesn't balance the daily storage and use, the difference is reported here as the Error Balance. It results from either (1) the commissioner not reporting all the water entering and leaving reservoir storage and/or the Regulation Balance, (2) an error in the reporting program used by the Division of Water Rights to summarize the Commissioner's data (please contact Ben Anderson if such errors are known to exist), or (3) not entering the correct data. The daily mass balance reports give an itemized accounting of the daily errors. The balance is cumulative beginning November 1, 1993.

Measured Content
This is the daily measured JL content. It is usually based on a daily elevation measurement and the elevation/capacity relationship developed by the USBR. Obviously this isn't the exact reservoir content, but we assume it is in order to perform the accounting and calculate daily natural flow. If the daily elevation measurement doesn't represent the true contents due to wind, tidal, or other error-producing interferences, the Commissioner may choose to use his regulation balance to smooth out errors so the deliveries are more constant. If there is no need to distribute daily flows according to the rights on the river, the measurement errors are often neglected and the latest appropriator's daily deliveries fluctuate more than if the regulation balance were used to smooth the calculated natural flow. Minimizing or eliminating the regulation balance during critical times could adversely impact primary rights and benefit secondary or storage rights. Conversely, excess smoothing of the natural flow beyond what would naturally occur if the reservoirs didn't exist would benefit the direct flow rights at the expense of secondary or storage rights. There is no easy way to separate measurement-induced errors from natural flow fluctuations. The allocations of the daily natural flow is therefore somewhat subjective and is left up to the discretion of the commissioner. Water users are encouraged to review the water distribution allocations during periods of time they receive water.


DEER CREEK RESERVOIR:

PRIORITY STORAGE:
Priority Storage is storage not subject to calls by downstream rights under the Utah Lake Distribution Plan.

Balance from Previous Year
The distribution/storage year begins November 1. The end-of-day balance on October 31 is carried over to the new year as the starting point for the next day (November 1) data to be added/applied to. This includes inactive storage, which is 2,868 Ac-ft.

Duchesne Tunnel Direct
PRWUA Duchesne River imports passed through Heber Valley after being assessed the customary 4% transmission loss. (100% passed through JL and 96% passed the Upper Midway Dam and entered DC as reported here.)

Duchesne Tunnel Exchanged In
PRWUA Duchesne River imports exchanged down to Deer Creek with CUWCD storage in Deer Creek. The 4% loss remains in the Jordanelle Reserve Account to be released with the CUWCD storage water exchanged up from DC.

Weber Canal Direct
PRWUA Weber River transbasin diversion water passed through Heber Valley and was either stored in Deer Creek or used by PRWUA as Extra Allotment water. The 4% loss is assessed similar to the Duchesne Tunnel above.

Weber Canal Exchanged In
PRWUA Weber River imports stored in Jordanelle and exchanged down to Deer Creek. The 4% loss remains in JL Reserve to be released with storage water exchanged up to JL from DC.

Change Applications and PRP a1902 & a1903
Water stored under change applications (or without an approved water right application if change applications don't exist). The a1902 and a1903 applications are to store water in Deer Creek that was historically used on land now under the reservoir.

Jordanelle Reservoir (Transfer)
Net CUWCD water released from Jordanelle Reservoir to Deer Creek Reservoir.

Converted (A12141 & A12144, E398)
System storage conversions resulting from PRWUA (A12141 & A12144) and CUWCD (E398) credit in Utah Lake from imported water. The PRWUA have requested that their credit in Utah Lake be exchanged upstream with the first Provo River water they store in Deer Creek Reservoir each year. CUWCD can store Priority Storage water under E398 when replacements are made in Utah Lake from Strawberry Reservoir for the water stored. Such exchange can only take place if the credit in Utah Lake doesn't spill before the upstream storage is available to make the exchange. These exchanges occur daily based on whether or not the CUWCD requests the exchange. In 2003 exchanges E3100, E3101, and E4219 were approved and there is a need to also include them here. In a letter to the Regional Engineer dated March 31, 2003, the CUWCD requested that CUWCD's purchased Utah Lake water be exchanged upstream first to Deer Creek and then to Jordanelle in the following order; E4319, E3101, and E3100. Water stored upstream in excess of the daily amounts available under these purchased rights would be converted by exchange under E398 on a daily basis.

Converted (Conversion Criteria)
System Storage converted to Priority Storage under the criteria set forth in the State Engineer's Utah Lake Distribution Plan. PRWUA storage in Deer Creek converts first, followed by CUWCD storage in both JL and DC.

PRWUA Use to CUWCD (Leased)
This is storage reported as used under PRWUA use but the user is not identified. The storage is leased by the CUWCD for later use as CUWCD storage water.

Transfer PRWUA to CUWCD
This entry summarizes several database stations. One station allows lump sum block transfers from PRWUA to CUWCD that for accounting purposes are not reported as a PRWUA use. Other stations summarize exchanges of PRWUA water used above Jordanelle Reservoir by exchange with CUWCD water replaced here with PRWUA water in Deer Creek.

Exchanged to Jordanelle with PRWUA Imports
CUWCD Priority Storage in Deer Creek that is exchanged upstream with PRWUA import water stored in Jordanelle. This first occurred in 2001, when the System Storage was not sufficient to exchange all imported water.

Exchanged to Jordanelle with PRWUC Imports
This exchange probably should not occur because there is no water right. PRWUC Import water is stored in Jordanelle and the net amount (96%) of CUWCD Priority Storage in Deer Creek is used to supply the water to Provo Reservoir Water User Company.

PRWUA Extra Allotment Use
Whenever Deer Creek initially fills (as determined by the 1994 DC/JL Operating Agreement) or is declared full by the PRWUA, the PRWUA may elect to draw upon excess water of the Weber River (and Provo River after JL fills) to deliver more water to its shareholders than the storage water represented by PRWUA stock (1 ac-ft per share), provided the extra allotment is approved by the Secretary of the Department of Interior. Typically the PRWUA will declare a specific time period during which the stockholders can use extra allotment water without it being charged to their normal DC storage allotment. Such water is accounted as stored and used simultaneously.
For the purposes of this report, extra allotment use could have been combined with the Storage Use line below. It is reported separately because extra allotment is a useful indicator of how much PRWUA water is delivered in excess of the normal ac-ft per share allotment. When extra allotment is declared available, the PRWUA ceases diverting or storing Provo River water until after JL fills or is declared full, based on provisions of the operating agreement.

Storage Use
Storage water use from the specified Deer Creek account. In the case of PRWUA, the use reported here is in addition to the Extra Allotment use reported above.

Spilled to Provo River Rights
Storage water spilled to the next appropriator on the Provo River. PRWUA should not spill storage water because their water is primarily imported water which the "next available appropriators" have no right to divert. Transbasin diversions should cease if PRWUA doesn't have a use for such imported water. PRWUA bylaws enable stockholders to store their unused (stockholder holdover) water in Deer Creek (DC) on a space available basis. This water is also considered PRWUA water and should not physically spill from PRWUA's account because it contains imported water. (Holdover spills to the carryover account and is not stored again under a different water right. Both carryover and stockholder holdover are included in the balance carried forward from the previous year, and the internal accounting of them is left to the PRWUA.) CUWCD storage water in DC is usually the first water to spill from DC since DC does not have flood control storage provisions. It is possible, however, that CUWCD storage paper spills to excess natural flow and is stored again by the PRWUA as System 2 storage (under a different water right) in DC without physically leaving the reservoir.

Evaporation
The daily evaporation losses reported by the Commissioner are divided according to storage account balances at the end of the previous day.

Priority Storage Balance
Storage balances not subject to calls by downstream users.

SYSTEM STORAGE:
Storage subject to call under the Utah Lake Distribution Plan by downstream water users with prior rights.

Olmsted Water (System 1)
Water stored in DC that is subject to the Olmsted Power Rights.

Non-Olmsted
Provo River water stored in DC that is in excess of the 429 cfs Olmsted Power rights. This is always stored by the PRWUA except for when PRWUA has declared extra allotment and is using extra allotment water.

Exchange of System Storage in Jordanelle
PRWUA System 2 exchanged down from JL with BU water in DC.

Exchange of PRWUA Imports in Jordanelle
CUWCD System storage exchange upstream with PRWUA imports.

Converted (A12141 & A12144, E398)
See above.

Converted (Conversion Criteria)
See above.

Called Downstream by Prior Rights
System storage released to satisfy rights in Utah Lake. We have not experienced an extended dry period severe enough to call upon System Storage in upstream reservoirs, but 2003 was very close. System Storage that is not converted to priority storage is subject to calls by users on the Jordan River.

System Storage Balance
System Storage balance subject to being called down by prior rights (under the Utah Lake Distribution Plan).

TOTAL STORAGE
Total storage in each account.

Regulation Balance
See Jordanelle Definition. Not reset to zero each year.

Error Balance
See Jordanelle Definition. Not reset to zero each year.

Measured Content
See Jordanelle Definition.

OLMSTED WATER: These are included for information purposes only.
Stored in Deer Creek & Jordanelle Reservoirs
Olmsted Power water stored by PRWUA and CUWCD.

Olmsted Power Generation (all sources)
Water delivered to the Olmsted Power Plant from all sources.


UTAH LAKE:


FLOOD
The flood account exists to account for excess water when Utah Lake is above the normal full compromise elevation. System Storage in Utah Lake is defined as the top 585,000 acre-feet. Whenever Utah Lake is above compromise the excess water is not defined as System Storage, but is reported here as flood storage. The account is presently set similar to other Utah Lake import accounts so the reported evaporation is based on the incremental increase in surface area associated with the flood waters above compromise elevation. It could probably be reported otherwise, such that the floodwater supplies the evaporation on both system and flood storage because it is unclear how to divide evaporation losses between these two accounts containing natural flow waters.

SYSTEM
This is defined as storage water within the top 585,000 ac-ft of space below compromise content of 870,000 acre feet. It bears the bulk of the lake evaporation loss because evaporation is based on incremental surface area and this makes up most of the surface area of the lake.


Balance from prev. yr.
Account balances forwarded from the end of the last day (October 31) of the previous distribution year. The distribution year of the Utah Lake/Jordan River System is January through December. For the purposes of this report, the year represented here, November through October, is the same as the Provo River System. Each distribution system may use whatever time period they choose and this may result in different annual totals.

Inflow
Water entering an account directly (PRWUA and CUWCD) or back-calculated (FLOOD and SYSTEM) based on change in content, outflow, and evaporation.

Return Flow Credit
PRWUA return flow credit is based on the quantity of PRWUA water used and the import-water component of such use. The method used to account for this credit is similar to the method historically used by the PRWUA.

Exchanged Upstream
Stored in DC and/or JL as a conversion of System Storage to Priority Storage under A12141 & A12144 (PRWUA) or E398, E4319, E3101, and E3100 (CUWCD).

Prim Right Releases
Releases from Utah Lake to downstream users with Primary rights.

Sec Right Releases
Releases from Utah Lake to downstream users with Secondary rights.

Flood Release
Releases for flood control purposes.

Evaporation
Evaporation in Utah Lake is calculated based on the incremental increase in surface area associated with each storage account. System Storage is assessed evaporation based on the surface area associated with the Inactive, Primary, and System storage accounts in the lake. The incremental increases in surface area associated with Flood (if any), PRWUA Weber imports, and CUWCD Strawberry imports, respectively, are calculated and assessed evaporation accordingly. The daily evaporation loss is determined using a Modified Blaney Criddle method with calibrated evaporation coefficients developed in Research Report No. 45, Consumptive Use of Irrigated Crops in Utah, Utah State University, Logan, Utah.

Balances
Account balances at the end of the last day in the reporting period.

Inactive Storage
The first 160,000 acre-feet of storage in Utah Lake. This storage is likely not accessible to the Jordan River pumping station.

Primary Storage
The first 125,000 acre-feet of storage water above the inactive storage. This water is dedicated for use by holders of primary water rights. Dredging is possibly required in order to deliver this water from Utah Lake.

Total Storage
This is the Utah Lake contents on the last day of the reporting period as reported by the Utah Lake/Jordan River Commissioner.

TOTAL SYSTEM STORAGE:
System Storage in JL, DC, and Utah Lake combined.

ADDITIONAL INFORMATION
Questions and comments regarding these reports and the reporting formats are welcome. The reports were compiled by the Utah Division of Water Rights using the Division's computer programs and the data reported by commissioners and others. As with other documents, the Division of Water Rights makes reasonable attempts to keep this document and the reports updated and accurate. Your suggestions and/or comments are welcome. Please direct them to Ben Anderson, Utah Division of Water Rights, (801) 538-7469.
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