Well Inventory & Preliminary Capital Improvement Plan

M&A’s work led to the creation of a Capital Improvement Plan (CIP) for one of Arizona’s largest irrigation districts. Facing shortages of CAP surface water supplies, the CIP enabled the MSIDD to cost-effectively meet its goal of increase its groundwater pumping capacity by repairing and rehabilitating existing wells.


MSIDD, an irrigation district in central Arizona (located between Phoenix and Tucson), was formed in 1962 to supply water and power for meeting agricultural demands. It controls over 400 wells and owns a 200-mile conveyance system (canals, laterals, pipes, and wells) that delivers locally pumped groundwater and Colorado River water from the CAP. In the future, less CAP water will be available for irrigation as the “agricultural pool” is phased out and Colorado River shortages occur; this water will also become more expensive as electrical costs rise in response to new emissions-reducing requirements at Navajo Generating Station, which provides nearly all of CAP’s power. As a result, the District needed to increase its groundwater pumping capacity.


M&A and Carollo Engineers worked with the District’s general manager to develop a phased, programmatic approach to improvements for the wellfield and conveyance system to support a CIP.

Groundwater Resource Development

  • Characterized the general hydrogeologic conditions to identify strategic locations for groundwater production
  • Established the requirements and protocols for rehabilitating or replacing wells and improving the conveyance system to transport irrigation water

Water Policy & Planning

  • Inventoried wells and canals and developed databases and GIS layers that the District can manage
  • Created a database of over 400 district wells
  • Evaluated and ranked the condition of MSIDD’s operable and potentially operable wells, canals, laterals, and pipelines; identified wells that are a priority for further investigation, rehabilitation, or replacement based on pumping history, age, and efficiency
  • Developed a least-cost recommendation for increasing pumping
  • Developed an interactive dashboard that provides information for each well (including its location) and enables with side-by-side comparisons to facilitate communication with the board and planning / analysis by management