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Overview
Location Eastern Snake Plain, Idaho 
Groundwater challenges Depletion of interconnected surface and groundwater 
Managed aquifer recharge (MAR) motivating factors Conflict between groundwater and surface water users due to interconnected water sources 
MAR project goal Recharge 250,000 AFY on average; since 2014, the project has recharged an average of 249,028 AFY 
Recharge method Infiltration in unlined canals or off-canal spreading basins, with some direct injection by injection wells 
Water source Snake River, Big Wood River, and Little Wood River 
Key actor(s) Idaho Water Resources Board (IWRB), Idaho Department of Water Resources, canal companies, and irrigation districts 
Challenges Technical—Building sufficient physical capacity to deliver and recharge all available water during wet years; tracking and monitoring recharge flows to understand how recharge affects the aquifer and surface water resources 
 Institutional—Building cooperative relationships between the Idaho Water Resources Board and local canal companies and irrigation districts 
 Funding—Securing a source of long-term funding from the state and financial contributions from water users 
 Regulatory—Obtaining surface water permits to divert water to recharge sites and addressing protests by stakeholders in the permit application process 
Milestones 2009—The ESPA Comprehensive Management Plan passed by the Idaho Legislature; IWRB begins piloting recharge projects in the Snake Plains Aquifer 
 2014—The ESPA Recharge Program fully implemented 
 2015—Settlement agreement reached between the Surface Water Coalition and the Idaho Ground Water Appropriators 
 2016—ESPA Recharge Program first exceeds annual recharge goal 
Current status Fully operational; in expansion phase as of this writing 
Cost US$20–25/AF 
Overview
Location Eastern Snake Plain, Idaho 
Groundwater challenges Depletion of interconnected surface and groundwater 
Managed aquifer recharge (MAR) motivating factors Conflict between groundwater and surface water users due to interconnected water sources 
MAR project goal Recharge 250,000 AFY on average; since 2014, the project has recharged an average of 249,028 AFY 
Recharge method Infiltration in unlined canals or off-canal spreading basins, with some direct injection by injection wells 
Water source Snake River, Big Wood River, and Little Wood River 
Key actor(s) Idaho Water Resources Board (IWRB), Idaho Department of Water Resources, canal companies, and irrigation districts 
Challenges Technical—Building sufficient physical capacity to deliver and recharge all available water during wet years; tracking and monitoring recharge flows to understand how recharge affects the aquifer and surface water resources 
 Institutional—Building cooperative relationships between the Idaho Water Resources Board and local canal companies and irrigation districts 
 Funding—Securing a source of long-term funding from the state and financial contributions from water users 
 Regulatory—Obtaining surface water permits to divert water to recharge sites and addressing protests by stakeholders in the permit application process 
Milestones 2009—The ESPA Comprehensive Management Plan passed by the Idaho Legislature; IWRB begins piloting recharge projects in the Snake Plains Aquifer 
 2014—The ESPA Recharge Program fully implemented 
 2015—Settlement agreement reached between the Surface Water Coalition and the Idaho Ground Water Appropriators 
 2016—ESPA Recharge Program first exceeds annual recharge goal 
Current status Fully operational; in expansion phase as of this writing 
Cost US$20–25/AF 
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