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 3.1 was recently updated to ETRAN 3.2. The difference in user interface functionality between ETRAN 3.1 and the updated ETRAN 3.2 model is negligible. For a complete list of updates between versions, see the ESPAM21readme.txt file inside the zipped folder download.
IDWR will no longer accept modeling completed in ETRAN 3.1 after January 31, 2016. In an effort to direct users to the new model version, ETRAN 3.1 is no longer available on this website. If you have an extenuating need to obtain a copy of ETRAN 3.1, please contact us.