Water Pressure & Flow Rates Plant: Hydrangea (Big leaf) Term:  Precipitation Rate
Hydrangea  Bigleaf <ul><li>Grows 4 – 6’ tall and 6-8’ wide   </li></ul><ul><li>Shade to partial sun  </li></ul><ul><li>Blo...
Precipitation Rate <ul><li>The amount of water placed over a landscape area.  Measured in inches per hour. </li></ul><ul><...
Plant Water Need For Optimum Growth* in the Piedmont area of Va. <ul><li>Plant type   Water need </li></ul><ul><li>Turfgra...
Calculations <ul><li>Step 1: Determine the precipitation rate </li></ul><ul><ul><li>Find the total Gallons Per Min. (GPM) ...
Calculation  <ul><li>Step 2:  Determine how long the sprinklers have to run to supply the needs of the plants </li></ul><u...
Example <ul><li>Your city water system supplies 8 gallons of water per minute. </li></ul><ul><li>You need to water your 24...
PR & Soil type <ul><li>You need to match the precipitation rate with the type of soil. </li></ul><ul><li>Different absorpt...
Soil & absorption Over 1.7” per hour  Good to excessive Low High Sandy 1 to 1.7” per hour Good Moderate Moderate Loam .2” ...
Nozzle charts <ul><li>Show the flow rate for each specific nozzle </li></ul><ul><li>What is the flow rate for this nozzle ...
Water Source 20 GPM Split 10 GPM 10 GPM Using the 10 VAN nozzle from the previous slide How many gallons per minutes are g...
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”...
Water flow & Pipe size <ul><li>If the pipe must carry </li></ul><ul><ul><li>1-6 GPM </li></ul></ul><ul><ul><li>7 – 10 GPM ...
Today <ul><li>Complete a 1/8” scaled drawing of the flagpole area on graph paper </li></ul>
Upcoming SlideShare
Loading in...5
×

9 29 Water Pressure & Flow Rates

749

Published on

Published in: Business, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
749
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
8
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

9 29 Water Pressure & Flow Rates

  1. 1. Water Pressure & Flow Rates Plant: Hydrangea (Big leaf) Term: Precipitation Rate
  2. 2. Hydrangea Bigleaf <ul><li>Grows 4 – 6’ tall and 6-8’ wide </li></ul><ul><li>Shade to partial sun </li></ul><ul><li>Bloom Color: Blue, Lavender, Pink, Purple, Red, White </li></ul><ul><li>Bloom Time: Mid spring - Late summer </li></ul><ul><li>Specimen plant, or border </li></ul><ul><li>Prune dead branches back late winter </li></ul><ul><li>Flower color varies depending on the pH of the soil. </li></ul>
  3. 3. Precipitation Rate <ul><li>The amount of water placed over a landscape area. Measured in inches per hour. </li></ul><ul><li>Used for spray irrigation – not drip </li></ul><ul><li>Rates must be matched to the discharge rate of the supply system (gallon per hour) </li></ul>
  4. 4. Plant Water Need For Optimum Growth* in the Piedmont area of Va. <ul><li>Plant type Water need </li></ul><ul><li>Turfgrass 1 – 1.5 in/week </li></ul><ul><li>Flowers 1 – 1.5 in/week </li></ul><ul><li>Trees & Shrubs 0.5 – 1 in/week </li></ul><ul><li>Groundcovers 0.25 – .5 in/week </li></ul>* We will rarely receive this much rain in this area
  5. 5. Calculations <ul><li>Step 1: Determine the precipitation rate </li></ul><ul><ul><li>Find the total Gallons Per Min. (GPM) from the system </li></ul></ul><ul><ul><li>Find the square footage of the area to be irrigated </li></ul></ul><ul><ul><li>Convert using the constant 96.3 </li></ul></ul><ul><ul><li>Plug into formula </li></ul></ul>PR = Tot GPM X 96.3 SF of area
  6. 6. Calculation <ul><li>Step 2: Determine how long the sprinklers have to run to supply the needs of the plants </li></ul><ul><ul><li># inches needed/week ÷ PR = Time in hours </li></ul></ul>
  7. 7. Example <ul><li>Your city water system supplies 8 gallons of water per minute. </li></ul><ul><li>You need to water your 2400 sq ft lawn (turf) </li></ul><ul><li>How long will you need to water? </li></ul><ul><li>(8 x 96.3) ÷ 2400 = .3 in per hour </li></ul><ul><li>Grass needs 1” per week/.3 in per hour = 3 hours of watering per week </li></ul>
  8. 8. PR & Soil type <ul><li>You need to match the precipitation rate with the type of soil. </li></ul><ul><li>Different absorption rates will dictate the frequency of watering to reach the required water needs for the plants </li></ul><ul><li>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. </li></ul><ul><li>May have to water 2, 3 or 4 times per week*** </li></ul>
  9. 9. 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
  10. 10. Nozzle charts <ul><li>Show the flow rate for each specific nozzle </li></ul><ul><li>What is the flow rate for this nozzle if it is spraying 360 at 15 psi? </li></ul><ul><li>Round to whole # </li></ul><ul><li>2 </li></ul>
  11. 11. 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?
  12. 12. 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
  13. 13. Water flow & Pipe size <ul><li>If the pipe must carry </li></ul><ul><ul><li>1-6 GPM </li></ul></ul><ul><ul><li>7 – 10 GPM </li></ul></ul><ul><ul><li>11 –16 GPM </li></ul></ul><ul><ul><li>17 – 26 GPM </li></ul></ul><ul><ul><li>27 – 35 GPM </li></ul></ul><ul><ul><li>36 – 55 GPM </li></ul></ul><ul><li>Select a pipe at least </li></ul><ul><ul><li>½ ” diameter </li></ul></ul><ul><ul><li>¾ ” diameter </li></ul></ul><ul><ul><li>1” diameter </li></ul></ul><ul><ul><li>1 ¼” diameter </li></ul></ul><ul><ul><li>1 ½ ” diameter </li></ul></ul><ul><ul><li>2” diameter </li></ul></ul>
  14. 14. Today <ul><li>Complete a 1/8” scaled drawing of the flagpole area on graph paper </li></ul>
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×