The ESPA Modeling Tools provide to the water management community a common way to analyze the hydrologic impacts of Water Supply Bank rentals within the Eastern Snake Plain Aquifer (ESPA). These tools enable users to evaluate the potential for a proposed rental within the ESPA to affect flows in the Snake River. In the event that the ESPA Modeling Tools show that the proposal could injure prior rights, the spreadsheets will reveal the extent of the mitigation necessary. The applicant can then draft a mitigation plan which minimizes injury to senior rights and create an application which complies with the ESPA moratorium order.
The ESPA Modeling Tool ETRAN 3.2 was recently updated to ETRAN 3.3. The difference in user interface functionality between ETRAN 3.2 and the updated ETRAN 3.3 model is negligible—the updated version only expands the model cells for which the user can select FROM and TO well locations. For a complete list of previous updates between versions, see the ESPAM21readme.txt file inside the zipped folder download.
IDWR will accept modeling completed in ETRAN 3.2 or ETRAN 3.3. In an effort to direct users to the latest version, ETRAN 3.2 is no longer available on this website. IDWR no longer accepts modeling completed with ETRAN 3.1. If you have an extenuating need to obtain a copy of ETRAN 3.1 or ETRAN 3.2, please contact us.