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Determining source of irrigation water for recharge calculaton. Technical report 04-010. Project scenario document DDW-017 final as-built Item Info

Design documents are a series of technical papers addressing specific design topics on the eastern Snake River Plain Aquifer Model upgrade. Each design document will contain the following information: topic of the design document, how that topic fits into the whole project, which design alternatives were considered and which design alternative is proposed. In draft form, design documents are used to present proposed designs to reviewers. Reviewers are encouraged to submit suggested alternatives and comments to the design document. Reviewers include all members of the Eastern Snake Hydrologic Modeling (ESHM) Committee as well as selected experts outside of the committee. The design document author will consider all suggestions from reviewers, update the draft design document, and submit the design document to the SRPAM Model Upgrade Program Manager. The Program Manager will make a final decision regarding the technical design of the described component. The author will modify the design document and publish the document in its final form in .pdf format on the SRPAM Model Upgrade web site. Final model documentation will include all of the design documents, edited to ensure that the "as-built" condition is appropriately represented. This is the final as-built document describing determination of the source of irrigation water. Recharge from surface-water irrigation is the largest component of aquifer recharge, and a large source of model uncertainty. The second-largest component of aquifer discharge is net withdrawals (calculated as consumptive use, or evapotranspiration) due to ground-water irrigation. The source of water for individual parcels must be identified so that diverted volumes of surface water are applied to the appropriate spatial locations. The source of water also affects the calculation of consumptive use, which depends in part on evapotranspiration (ET) adjustment factors, application method (sprinkler or gravity), and the reduction factor for non-irrigated inclusions within irrigated lands. For an individual parcel, the ET adjustment factor and sprinkler percentage from the local surface-water irrigation entity or the local ground-water irrigation polygon are applied, depending on the water source identified for the parcel. The reduction factor assigned is a weighted average of the sprinkler and gravity reduction factors, depending on the sprinkler percentage assigned to the parcel. Assigning these parameters for calculation purposes requires information on the water source for the individual parcel. An additional need to identify the source of irrigation by parcel is in use of the model, when a hypothetical scenario representing curtailment of irrigation may be tested. Many irrigated lands are either 100 percent surface-water irrigated or 100 percent ground-water irrigated. However, some irrigated lands have mixed ground water and surface water sources. This has typically occurred where surface water sources were inadequate, and supplemental ground water sources have been developed. This paper describes the method used to determine the source of irrigation water, the method used to calculate recharge on mixed-source lands, and the potential effects of errors in determining the mix ratio.

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Title:
Determining source of irrigation water for recharge calculaton. Technical report 04-010. Project scenario document DDW-017 final as-built
Authors:
Contor, Bryce A.
Date Created (ISO Standard):
2004-09-09
Description:
Design documents are a series of technical papers addressing specific design topics on the eastern Snake River Plain Aquifer Model upgrade. Each design document will contain the following information: topic of the design document, how that topic fits into the whole project, which design alternatives were considered and which design alternative is proposed. In draft form, design documents are used to present proposed designs to reviewers. Reviewers are encouraged to submit suggested alternatives and comments to the design document. Reviewers include all members of the Eastern Snake Hydrologic Modeling (ESHM) Committee as well as selected experts outside of the committee. The design document author will consider all suggestions from reviewers, update the draft design document, and submit the design document to the SRPAM Model Upgrade Program Manager. The Program Manager will make a final decision regarding the technical design of the described component. The author will modify the design document and publish the document in its final form in .pdf format on the SRPAM Model Upgrade web site. Final model documentation will include all of the design documents, edited to ensure that the "as-built" condition is appropriately represented. This is the final as-built document describing determination of the source of irrigation water. Recharge from surface-water irrigation is the largest component of aquifer recharge, and a large source of model uncertainty. The second-largest component of aquifer discharge is net withdrawals (calculated as consumptive use, or evapotranspiration) due to ground-water irrigation. The source of water for individual parcels must be identified so that diverted volumes of surface water are applied to the appropriate spatial locations. The source of water also affects the calculation of consumptive use, which depends in part on evapotranspiration (ET) adjustment factors, application method (sprinkler or gravity), and the reduction factor for non-irrigated inclusions within irrigated lands. For an individual parcel, the ET adjustment factor and sprinkler percentage from the local surface-water irrigation entity or the local ground-water irrigation polygon are applied, depending on the water source identified for the parcel. The reduction factor assigned is a weighted average of the sprinkler and gravity reduction factors, depending on the sprinkler percentage assigned to the parcel. Assigning these parameters for calculation purposes requires information on the water source for the individual parcel. An additional need to identify the source of irrigation by parcel is in use of the model, when a hypothetical scenario representing curtailment of irrigation may be tested. Many irrigated lands are either 100 percent surface-water irrigated or 100 percent ground-water irrigated. However, some irrigated lands have mixed ground water and surface water sources. This has typically occurred where surface water sources were inadequate, and supplemental ground water sources have been developed. This paper describes the method used to determine the source of irrigation water, the method used to calculate recharge on mixed-source lands, and the potential effects of errors in determining the mix ratio.
Subjects:
Aquifers Computer models Recharge
Location:
Eastern Snake Plain Aquifer; Southern Idaho
Latitude:
42.96
Longitude:
-115.13
Collection:
Boise Basin
Series:
ESPAM
IWRRI number:
2004010
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
Publisher:
Idaho Water Resources Research Institute; University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
KIT

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Preferred Citation:
"Determining source of irrigation water for recharge calculaton. Technical report 04-010. Project scenario document DDW-017 final as-built", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-ddw-017_wtr_src_9_04.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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