Irrigated land sprinkler fractions for the Eastern Snake Plain Aquifer Model Version 2, as built. Draft. Technical report 201008. ESPAM2 design document DDW-V2-12

This report is a Design Document for the calibration of the Eastern Snake Plain Aquifer Model Version 2 (ESPAM 2). Its goals are similar to the goals of Design Documents for ESPAM 1.1: To provide full transparency of modeling data, decisions and calibration; and to seek input from representatives of various stakeholders so that the resulting product can be the best possible technical representation of the physical system (given constraints of time, funding and personnel). It is anticipated that for some topics, a single Design Document will serve these purposes prior to issuance of a final report. For other topics, a draft document will be followed by one or more revisions and a final “as-built” Design Document. Superseded Design Documents will be maintained in a “superseded” file folder on the project Website, and successive versions will be maintained in a “current” folder. This will provide additional documentation of project history and the development of ideas. The amount of land irrigated in the ESPAM2 model area is required to estimate the following factors in the water budget: (1) evapotranspiration (ET) and (2) recharge that is expected to occur. The application method (whether the irrigation method is by sprinkler or gravity irrigated) also affects these two factors. The purpose of this design document is to provide a brief summary of how the sprinkler fractions were calculated in ESPAM1.1 and to discuss what was completed for ESPAM2. DRAFT