Groundwater Recharge and Recovery by the Public Works Department - PDF document

7/21/2020 Groundwater Recharge and Recovery by the Public Works Department What is Recharge and Recovery? 1

7/21/2020 Introduction to the Groundwater Recharge Facility The City operates an aquifer storage and recovery facility; the common name is a “Recharge Facility” • Recharges both surface water and treated effluent supplies • Requires state permitting • Meets both the State and City water management efforts for maintaining long-term groundwater supplies. 2015 Aerial, Low Background – Recharge Supplies • Historically, the community’s wastewater supplies were treated/reclaimed, and then used to irrigate Antelope Hills Golf Course. This golf course dates back to the 1950s. • When more reclaimed supplies were available than were needed at the golf course, then those volumes prior to 1987 were discharged to Granite Creek (until approximately 1988). • In 1988, the City was issued its first “Recharge Project Permit” from the State of Arizona for underground storage of treated effluent (a recharge facility). The facility was approved for 6,721 acre-feet per year. • In 1998, the City was issued two water storage permits. 4 2

7/21/2020 Background – Recharge Supplies (cont.) • In 2009, the City was issued a modified permit allowing for the recharge of 7,200 acre-feet per year. • In 2013, the City was issued a modified permit allowing for the recharge of 12,000 acre-feet per year. • The City continues to operate the recharge facility in the location that was first permitted in 1988. 5 Water Pumped vs. Wastewater Returned Comparison Water Pumped Wastewater Returned % Returned Year 2019 6855.06 4297.42 63% 2018 6733.18 4113.33 61% 2017 6734.86 4438.04 66% 2012 6725.31 3831.98 57% 2005 7838.5 4728.5 60% 2004 8054.5 4083.3 51% 2003 8091.6 3751.81 46% 3

7/21/2020 Yearly Recharge Volumes from 2006 - 2018 Questions 4