2023-08-14-minutes-public-works-study-session

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6.6 1 For Period of use change proposals, indicate the time of the year that the change would be in effect. NIA 6.7 For temporary chanae Proposals, indicate the timeframe that the proposed change would be in effect. NIA 6.8 For municipal change proposals, provide the most recent water right self - assessment, if one exists, as submitted to the Department of Health (DOH). NIA System Design and Operation 6.9 Provide a description of the existing water supply system from the point of diversion or withdrawal to the place of use. The authorized point of diversion is on Reecer Creek where it crosses Dry Creek Road, located approximately 0.4 miles north from the place of use. The diversion is not metered and is shared by another water right holder (presumably authorized under Court Claim No. 02261). Diverted water is gravity conveyed southward in a buried pipe that undershoots Highway 10 and discharges to an unlined ditch. The unlined ditch flows through a red clay pipe that undershoots the Northern Pacific Railroad before delivering water to a concrete ditch beginning at the northeast corner of the property. The property has been historically irrigated using surface irrigation methods. A concrete -lined ditch delivers water under gravity to the northernmost portions of the field for surface (furrow) irrigation. Water is collected and redistributed throughout the central and southern portions of the field using a series of unlined and concrete -lined ditches. 6.10 Provide preliminary design plans and specifications for the proposed change, including diversion or withdrawal and conveyance facilities, if applicable, and the proposed flow rate and volume design capacity. NIA. 6.11 ' Describe how the change proposal would affect return flow. Return flow would be protected instream in the primary trust reach. 6.12 ' Provide the current and projected system efficiency covered by the water right proposed for change. The updated Washington Irrigation Guide (WIG) estimates average amount of water required by a crop above the portion of the requirement that might be met by antecedent moisture in the root zone under average climatic conditions (the amount of water a crop needs in excess of rainfall). The monthly WIG data indicate that the updated Crop Irrigation Requirement (CIR) for clover — the surrogate crop used for timothy hay near Ellensburg — is 2.76 feet/acre. The court confirmed water duty (or Total Irrigation Requirement) for the subject water right is 19.2 feet per year ft/ r for surface irrigation i.e., furrow irrigation). The Supplemental Report of Referee Sections 6-11 Form No. ECY 040-1-97 (Rev 01-2020) Page 2 of 11