In conjunction with the construction of a new water reclamation facility and storage lagoon to support local development, the Oxford Area Sewer Authority (OASA) needed a method to dispose of its treated water (effluent). To prevent the release of effluent into local streams that travel through the Chesapeake Bay Watershed, OASA’s member communities chose to address the discharge issue by using spray irrigation. Spray irrigation also allows the effluent to remain in the drainage area in which it originated, replenishing local aquifers.
RETTEW designed and constructed the Ross Spray Fields, which encompass approximately 100 acres, with about 60 acres of sprayable area. The spray fields consist of center pivots and fixed nozzle spray equipment, allowing for the disposal of approximately 405,000 gallons of treated effluent per day. Additionally, spraying helps preserve local farmland as both agricultural and open space. Assuming average concentrations for treated effluent, OASA is preventing more than 10,900 pounds of nitrogen and more than 1,400 pounds of phosphorous from being discharged yearly into the Chesapeake Bay Watershed.