Water Well Journal
Issue link: http://read.dmtmag.com/i/668983
Without knowing the specifics of the NRCS technician's situation, my assumption is the pump system designer likely subscribed to the principle the steeper the head-capacity curve, the better. This designer either failed to understand the relationship between head-capacity curves and system head curves, or worse yet, simply failed to ask the appropriate questions to take secondary operating conditions into account. I think these examples show there is no one-size-fits-all approach to pump design. Each application requires us to ask probing questions so we can properly design the pumping sys- tem to meet our customer's present and future needs. It is in asking these questions we truly become a resource, and not just a vendor or supplier. WWJ Mike Allen has worked extensively on water issues in Nebraska and was appointed by the governor to the Water Well Standards and Contractors Licensing Board in 1999 and served as chairman until 2013. He also served two terms as a director on the Little Blue Natural Resources District Board of Directors and serves on the Board of Directors of the Nebraska Water Resources Association. Allen currently serves on the Board of Trustees for Mary Lanning Memorial Healthcare in Hastings, Nebraska. He can be reached at michael.allen@marylanning.org. For more information on pumping systems, visit the NGWA Bookstore at www.NGWA.org. DACUM Codes To help meet your professional needs, this column covers skills and competencies found in DACUM charts for drillers and pump installers. PI refers to the pumps chart. The letter and number immediately following is the skill on the chart covered by the column. This column covers: PIA-3, PIA-4, PIC-1, PIC-5 More information on DACUM and the charts are available at www.NGWA.org. Figure 5. Pump with specific speed of 2720 and pressure at 600 gpm goes up more than 47 feet. WWJ May 2016 33 Twitter @WaterWellJournl