Upload
dinhhanh
View
231
Download
0
Embed Size (px)
Citation preview
Simple Concepts in Irrigation
• Households with in ground spinkler systems use 35% more water outdoors (AWWA)
• Households with automatic timers use 47% more water outdoors (AWWA)
Irrigation Conservation is Needed
Mechanical Controler
• Easy to set• Must manually turn on timer• Automatic shutoff
Battery OperatedHose end In-line
Automatic Timer
•More difficult to set •Automatically turns irrigation on• Automatic shutoff
Underground Valves
Irrigation Scheduling
What days?What hours?
Stay out of trouble
• Know the rules in your area• Schedule for conservation
Check your OrdinancesBackflow Prevention may be required to prevent yourirrigation system from contaminating water supplies
Watts.com
How much water?Rule of thumb:•Shrubs: up to once a week - apply one gallon of water per foot of plant height•Lawns: up to once a week -up to one inch per application •Trees: up to once a weekone inch of water under entirecanopy
*It’s best to water infrequently,deep and early in the morning
How do I know how longI need to irrigate?
Set out tuna cans or rain gaugesrandomly throughout your lawn
Measure how much waterwas applied and calculate how long it will take to apply the water you need
Individually turn on each irrigation zone for 15 minutes. check to be sure irrigation is uniform adjust heads if irrigation isn’t uniform
Set out tuna cans or rain gauges randomly throughout your lawn
Check Uniformity of Application
Don’t water thepavement
Check for leaks
Hit the target
Reduce irrigation when demand is low
0123456789
Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May
AthensUGA Farm
Evap
orat
ive
Wat
er L
oss
- In
ches
Rain CutoffInstall an automatic rain cutoff device
Don’t water in the rain!!!
Moisture Meter
Another option for improved conservation
Spray IrrigationUsed to irrigate large uniform areas
Convert to Drip IrrigationConvert to Drip IrrigationConserve by watering individual plants
Drip System
Drip Irrigation Retrofit Kits
PressureRegulator
Filter
Check your Water Supply
(Bucket size in gallons / Seconds to fill) * 3600 seconds per hr. * .75
Flow Rate (gallons per hour) =
Example: 5 gallon bucket took 30 seconds to fill
5 / 30 x 3600 x .75 = 450 gallons per hour
Pipes and fittings
Emitters
- Many shapes and styles- Flow rate 0.5 – 10 gal./hr- Pressure compensating- Do not mix drip with micro spray
Layout
300 mature plants (4 feet tall)
- Total requirement: 300 x 4 = 1200 gallons- Supply = 450 gallons per hour
Possible Solutions:
Example:
- One zone, ½ ghp emitters for 8 hours (150 gph)- One zone, 1gph emitters for 4 hours (300 gph) - Two zones 2 ghp emitters for 2 hours (300 gph)
- Plant requirement – 4 gallons