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Static Water Supply Sources

Outline. I. Principles of LiftA. Theoretical LiftB. Maximum LiftC. Dependable LiftD. Determining Net Pump Discharge PressureII. Natural Static Water Supply SourcesA. Adequacy of the Natural Static Water SupplyB. Accessibility of the Natural Static Water Supply SourceIII. Man-made Static Water Supply SourcesA. CisternsB. Private Water Storage TanksC. Ground ReservoirsD. Swimming PoolsE. Agriculture Irrigation Systems .

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Static Water Supply Sources

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    1. Static Water Supply Sources

    2. Outline I. Principles of Lift A. Theoretical Lift B. Maximum Lift C. Dependable Lift D. Determining Net Pump Discharge Pressure II. Natural Static Water Supply Sources A. Adequacy of the Natural Static Water Supply B. Accessibility of the Natural Static Water Supply Source III. Man-made Static Water Supply Sources A. Cisterns B. Private Water Storage Tanks C. Ground Reservoirs D. Swimming Pools E. Agriculture Irrigation Systems

    3. Principles of Lift The process of raising water to supply a pumper is called drafting The elevation difference is considered lift. The process to pull the water into the hard suction hose is referred to as a vacuum

    4. Theoretical Lift A Pump theoretically lifts 33.8 feet at sea level Lift decreases in altitude per 1,000 ft. Pumpers are unable to draft more than 33.8 ft.

    5. Maximum Lift Maximum height water can be raised through hard suction Varies according to : Condition of the pump Atmosphere Most cases max. is 25 ft.

    6. Equation for Maximum Lift Equation J 1.13 (A Constant) x Hg (inches of Mercury) = Maximum lift

    7. Dependable Lift The height a column of water may be lifted enough to provide enough flow. Every pumper should be capable of lifting at least 14.7 ft. Note table 12.1 As lift increases, pump capacity decreases a. Pumps only deliver 70% at 15 ft.

    8. Determining Net Pump Discharge Pressure While pumping from a draft, Pump discharge is more than shown. Pressure is sum of discharge & intake friction loss Note Table 12.2

    9. EQUATION L & N Pressure Correction = lift + total intake hose friction loss 2.3 Pressure Correction= NPDP = PDP + intake pressure correction

    10. Natural Static Water Supply Sources 1. Natural 2. Man-made

    11. Natural static water supply Should be identified during pre-planning 2 primary factors to consider Adequacy of the Water Accessibility

    12. Adequacy of the Water Evaluate for droughts or fluctuations Adequacy can be evaluated by using: Equation O Q = A x V x 7.5

    13. Accessibility of the Natural Static Water Supply Source Problems Inability to reach the water Wet or soft ground Not enough depth Silt or debris Freezing weather

    14. Inability to reach the water

    15. Wet or Soft Ground Approaches

    16. Inadequate Depth for Drafting Must have at least 24 inches around the strainer

    17. Silt and Debris Problems Clogging in the strainer Damage to the fire Pump Clogging of nozzles

    18. Freezing Water

    19. Man-Made Static Water Supply Sources Cisterns Private water storage tanks Ground reservoirs Swimming pools Agricultural irrigation systems

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