Water Well Journal
Issue link: http://read.dmtmag.com/i/608970
Being free from having to be logged on to the system, the trial and error associated with programming was done at leisure and resulted in the creation of a wide array of specialized analytical tools not available with SCADA or third-party reporting products. For example, we discovered long periods of injection at 45 gallons per minute didn't allow efficient cleaning of the well screen environment. Discharge pumping at 250 gpm was required to clear the plugging, and in fact is needed periodically especially during a long in- jection cycle. Using the off-site database, we performed specific capacity (SC) cal- culations for years of historic data and determined the shortest pumping dura- tion that could generate a reliable SC. The result is almost every pumping event becomes an opportunity to quanti- tatively assess the efficiency of the well. SC calculations are performed on the fly and the injection/discharge pumping ra- tios changed to maintain well efficiency while maximizing injection. Conclusions This project is a success for all the stakeholders. In fact, on October 14, the PUD received only the second permanent ASR license to be awarded in Oregon. Here are just some of the reasons why: • The project results greatly exceeded the PUD's initial needs. More than 6 million gallons of water are capable of being stored in the sole ASR well—far in excess of the 1 million gallon storage capacity initially needed and six times the storage ca- pacity of the PUD's three existing above-ground reservoirs. • Water quality within the receiving aquifer is improved by the addition of the source water obtained from other system wells. • The residents and users of the water have the aesthetic benefit of observ- ing no change to the bucolic scenery outside their windows. Six million gallons of water stored invisibly un- derground is equivalent to a dozen half-million-gallon above-ground reservoirs—tanks that never had to be constructed. The use of underground storage for drinking water is becoming more com- mon in the United States, but small and medium water supply systems that may benefit from underground storage have traditionally avoided ASR due to cost concerns. This project demonstrates the bene- fits of ASR can be an affordable alterna- tive to above-ground storage tanks for small as well as for large water supply districts. SECOND USE from page 31 Bob Mansfield is the owner of Buffalo Geo- logical Consulting. He has 40 years of experi- ence working with earth fluids—water, oil, and gas—and is a registered geologist in California, Oregon, and Washington. He can be reached at buffalo@buffalogeo.com. WWJ 32 December 2015 WWJ waterwelljournal.com Read Interview with ASR Experts Make sure you read the article in the WWJ September issue which interviewed two industry experts on aquifer storage and recovery. The article is titled "Saving Water for a Drier Day." Stanton, California (800) 553-3058 Fresno, California (559) 834-1342 Phoenix, Arizona (602) 276-2944 Conroe, Texas (800) 782-3225 Lubbock, Texas (800) 460-4906 Threaded Column Pipe Column Pipe Couplings Threaded Lineshaft Lineshaft Couplings Threaded Lineshaft Bearings Bronze Bearing Retainers (Lead Free Avaliable) NSF Approved Coatings & Galvanizing Avaliable Fabricated Steel Heads Fabricated Barrels Flange Column Pipe S.S. Shaft Sleeves Tube Stabilizers Strainers (All Material Grades) Surge Control Valves Manufacturer of Lineshaft Turbine Water Well Materials per OEM Specs BOOTHS 759 & 761 AT THE NGWA CONVENTION IN LAS VEGAS, DECEMBER 5 THRU 7 BOOTHS 764/766 AT THE NGWA CONVENTION IN LAS VEGAS, DECEMBER 16 AND 17