9 29 Water Pressure & Flow Rates
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9 29 Water Pressure & Flow Rates

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    9 29 Water Pressure & Flow Rates 9 29 Water Pressure & Flow Rates Presentation Transcript

    • Water Pressure & Flow Rates Plant: Hydrangea (Big leaf) Term: Precipitation Rate
    • Hydrangea Bigleaf
      • Grows 4 – 6’ tall and 6-8’ wide
      • Shade to partial sun
      • Bloom Color: Blue, Lavender, Pink, Purple, Red, White
      • Bloom Time: Mid spring - Late summer
      • Specimen plant, or border
      • Prune dead branches back late winter
      • Flower color varies depending on the pH of the soil.
    • Precipitation Rate
      • The amount of water placed over a landscape area. Measured in inches per hour.
      • Used for spray irrigation – not drip
      • Rates must be matched to the discharge rate of the supply system (gallon per hour)
    • Plant Water Need For Optimum Growth* in the Piedmont area of Va.
      • Plant type Water need
      • Turfgrass 1 – 1.5 in/week
      • Flowers 1 – 1.5 in/week
      • Trees & Shrubs 0.5 – 1 in/week
      • Groundcovers 0.25 – .5 in/week
      * We will rarely receive this much rain in this area
    • Calculations
      • Step 1: Determine the precipitation rate
        • Find the total Gallons Per Min. (GPM) from the system
        • Find the square footage of the area to be irrigated
        • Convert using the constant 96.3
        • Plug into formula
      PR = Tot GPM X 96.3 SF of area
    • Calculation
      • Step 2: Determine how long the sprinklers have to run to supply the needs of the plants
        • # inches needed/week ÷ PR = Time in hours
    • Example
      • Your city water system supplies 8 gallons of water per minute.
      • You need to water your 2400 sq ft lawn (turf)
      • How long will you need to water?
      • (8 x 96.3) ÷ 2400 = .3 in per hour
      • Grass needs 1” per week/.3 in per hour = 3 hours of watering per week
    • PR & Soil type
      • You need to match the precipitation rate with the type of soil.
      • Different absorption rates will dictate the frequency of watering to reach the required water needs for the plants
      • For example: You find that you must water your plot 3 hours per week, but the soil may not be able to absorb the required amount in 3 hours.
      • May have to water 2, 3 or 4 times per week***
    • Soil & absorption Over 1.7” per hour Good to excessive Low High Sandy 1 to 1.7” per hour Good Moderate Moderate Loam .2” per hour Poor High Low Clay Water absorption Drainage Water retention Water intake rate Soil Type
    • Nozzle charts
      • Show the flow rate for each specific nozzle
      • What is the flow rate for this nozzle if it is spraying 360 at 15 psi?
      • Round to whole #
      • 2
    • Water Source 20 GPM Split 10 GPM 10 GPM Using the 10 VAN nozzle from the previous slide How many gallons per minutes are going past each spray head?
    • Use the smallest pipe possible to carry the needed water rate Water Source 20 GPM 1 ¼” Pipe Split 10 GPM ¾” Pipe 10 GPM ¾” Pipe 8 GPM 6 GPM 4 GPM 2 GPM ¾” Pipe ½” Pipe ½” Pipe ½” Pipe 8 GPM 6 GPM 4 GPM 2 GPM ¾” Pipe ½” Pipe ½” Pipe ½” Pipe
    • Water flow & Pipe size
      • If the pipe must carry
        • 1-6 GPM
        • 7 – 10 GPM
        • 11 –16 GPM
        • 17 – 26 GPM
        • 27 – 35 GPM
        • 36 – 55 GPM
      • Select a pipe at least
        • ½ ” diameter
        • ¾ ” diameter
        • 1” diameter
        • 1 ¼” diameter
        • 1 ½ ” diameter
        • 2” diameter
    • Today
      • Complete a 1/8” scaled drawing of the flagpole area on graph paper