easy drip irrigation for your garden or landscapesome experts say a garden or landscape irrigated...
TRANSCRIPT
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Easy Drip Irrigation for Your Garden or Landscape
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What is drip irrigation
A low volume watering method that delivers water
slowly and directly to the plant roots for maximum efficiency.
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What is micro-irrigation
Micro-spray and other devices operating at low pressure that apply water just above, on, or below the surface of the soil at low flow rates.
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Why drip irrigation
Most efficient method of irrigation Reduces water runoff, deep percolation, evaporation Reduces water contact with leaves, stems, and fruit Reduces weed establishment Creates less favorable conditions for disease Often results in increased yields Exempt from NJ DEP drought restrictions
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Why drip irrigation
We have a responsibility to be better stewards of the
environment.
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Nationwide, landscape and garden irrigation is estimated to account for almost 1/3 of all residential water use
Source: EPA
“Outdoor Water Use in the United States”
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That totals approximately 7 billion gallons of water per day
Source: EPA
“Outdoor Water Use in the United States”
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Experts estimated that
some 3.5 billion gallons per day
Source: EPA
“Outdoor Water Use in the United States”
50% of that water is wasted
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Drip irrigation saves water Some experts say a garden or landscape
irrigated with drip irrigation will use 50% less water than with a conventional irrigation system or hose end watering.
These savings can only be realized if the drip irrigation is installed properly and operated efficiently.
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That is way drip irrigation is so widely used in farming
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Components of a drip irrigation system Point of connection, a water source Backflow preventer Timer (optional) Strainer Pressure reducing valve Distribution pipe Emitters or micro-sprays Miscellaneous other components
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Point of connection Plumbing connection with shut-off valve Well system Hose bibb
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Indoor Point of Connection Plumbing connection with shut-off valve
Shut-off Ball Valve
Main Shut-off
Water Meter
Tee connection to water service
Plugged Tee for Blow-out Connection
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Point of connection Well System
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Point of connection Hose bibb
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Point of connection Hose bibb components
“Y” connector
Backflow preventer
Tubing connector Pressure
Regulator
Filter
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Backflow preventer
A backflow is a must!
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What is Backflow? The undesirable reversal of flow of water or other substances into the potable water distribution system
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It happens!
In 1969 the entire Holy Cross Football Team came down with infectious hepatitis as a result of drinking water contaminated from the football field irrigation system
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Backflow Example
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Hose shut-off “Y” connector
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Hose shut-off “Y” Connector Allows connection of both
drip irrigation and a hose or 2 drip connections.
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Filters Prevent drip emitters from clogging
Minimum of a100 micron or 150 mesh filter is recommended
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Pressure regulator Insures pressure is reduced to an optimum
range Needed when pressure exceeds 50 psi
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Point of connection Hose Bibb
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Typical Hose Bibb Point of connection
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Battery timers - optional
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Optional timer
Timer should be installed between the hose bibb and the backflow preventer
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How many drip emitters can I operate at one time?
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Determining the water supply from a hose bibb Tools needed
Pressure gauge 5 gallon bucket Stop watch
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Performing a pressure test Attached a pressure gauge
to a hose bibb and record the pressure
Pressure is measured in pounds per square inch (psi)
If the pressure is greater than 50 psi, a pressure regulator will be required
If the pressure is below 30 psi, it may be inadequate for proper drip irrigation
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Performing a bucket test Place a 5 gallon bucket under a
running hose bibb With a stop watch, time how long
it takes to fill the bucket Divide 5 gallons by the number of
seconds it takes to fill the bucket (yields gallons per second)
Multiply that number by 3600 (yields gallons per hour or GPH)
Multiple this number by 75% This is my total allowable flow in
gallons per hour (gph)
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Example of a bucket test 5 gallon bucket filled in 40
seconds 5 ÷ 40 = .125 gallons per
second .125 x 3600 = 450 gph 450 x 75% = 337.5 gph 337.5 is my total allowable flow
in gallons per hour (gph)
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Example of a bucket test
If 337.5 is my total allowable flow in (gph) Using 0.6 gph drip emitters,
you could operate 562 at a time (337.5 ÷ 0.6 = 562.5)
Using 0.9 gph drip emitters, you could operate 375 at a time (337.5 ÷ 0.9 = 375)
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Types of drip emitters Pressure compensating vs. non-pressure
compensating emitters Use pressure compensating emitters if:
You have long runs of any single row drip tube You have elevation changes in excess of 15
feet on any drip tube run Otherwise, for garden and residential
landscape applications, it doesn’t really matter whether the drip emitters are pressure compensating or not
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Types of drip emitters Line source emitters are pre-installed
internally in the tubing at equally spaced intervals
Point source type emitters are attached external to the lubing. The installer can select the desired location to suit the planting configuration
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Line source drip emitters Pre-spaced inline drip emitters
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Line source drip emitters Pre-spaced inline drip emitters
Emitters are molded into the tubing at consistent spaced intervals – 12”, 18”, 24”
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Line source drip emitters Pre-spaced inline drip emitters
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Line source drip emitters Pre-spaced inline drip emitter irrigating strawberries
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Point source type drip emitters Pressure compensating “button” emitters installed where they are needed
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Point source type drip emitters Pressure compensating “button” emitters
Hole punch used to pierce the tubing to install the emitter
http://www.youtube.com/watch?v=d4BoEacEPuo
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Point source type drip emitters Self-piercing drip emitters
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Point source type drip emitters Classic Flag Emitters
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Point source type drip emitters Emitters discharge can be extended with ¼” tubing
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Point source type drip emitters Spot watering
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Point source type drip emitters Classic flag emitters
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Point source type drip emitters Spot watering
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Point source type drip emitters Multi-port pressure compensating emitters
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Point source type drip emitters Multi-port pressure compensating emitters allow multiple plants to be irrigated from a single emitter
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Micro Spray Often preferred to irrigate flower beds to accommodate the seasonal color change
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Micro sprays irrigating flowers Accommodate seasonal change of color
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Micro sprays irrigating raised brick planter with annual color changes
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Soaker hose Made from recycled rubber tires Soaker hose does not distribute water
evenly. Heavier application occurs the closer you are to the source. If used, the length of run should not exceed 50 feet.
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Soaker hose Vegetable garden irrigated with soaker hose. Owner confirmed uneven distribution of water with plants closer to the water source getting more water.
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So which one do we choose? Points to consider
Type of landscape or plant material Soil type or texture Maintenance or gardening activity
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Different landscapes and gardens have different soil types
Soil Texture Triangle
All soils are comprised of: o sand o silt o clay
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Emitters perform differently depending on the soil type (texture)
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Emitters perform differently depending on soil type (texture) Heavier clay type soils require emitters
with a slower application rate Requires longer irrigation period or multiple
shorter cycles Lighter sandy type soils benefit from
emitters with a faster application rate Requires a shorter irrigation period due to
faster application rate
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Line source emitters One example Pre-spaced drip tubing
comes with: different emitters with
different discharge rates
Different spacing between emitters
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Drip fittings – easy to join Insert fitting Compression fittings
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Drip fittings – easy to join Be sure the fittings are appropriate for the
size and type of tubing
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End cap Remove to flush tubing
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Drip staples Holds tubing in place, space as needed
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Drip indicator Flag stands up when drip tubing is pressurized
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Lets look at some applications Line source emitters Point source drip emitters
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Line source emitters Pre-spaced tubing irrigating flowers
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Line source emitters Pre-spaced tubing irrigating small shrubs
Solid tubing (no emitters)
0.9 gph – 12” spaced emitters
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Line source emitters Pre-spaced tubing irrigating mid-size ornamental trees
Solid tubing (no emitters)
0.9 gph – 12” spaced emitters
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Line source emitters Pre-spaced tubing irrigating larger tree
0.6 gph – 12” spaced emitters
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Slower application rate to saturate the tree root ball
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Line source emitters Pre-spaced tubing irrigating island to be planted with ground cover
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Line source emitters Pre-spaced tubing irrigating rows in a vegetable garden
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Line source emitters
Rows of pre-spaced drip tubing ready to irrigate vegetable
garden
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Line source emitters Sub-surface turf drip irrigation
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Line source emitters Longwood Gardens Pre-spaced tubing irrigating slopes on landform
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Point source drip emitters Installed in raised planter box where need to irrigate plant material
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Point source drip emitters Installed on stake to irrigate tomato plant
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Point source drip emitters Installed where need to irrigate pots and hanging baskets (1/4” tubing with emitters)
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Point source drip emitters Installed where need to irrigate vines
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Micro sprays Placed where needed to irrigate ground cover
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Point source drip emitters A combination of point source emitters and micro spray irrigation positioned where needed to water plant material.
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Longwood Gardens East Conservatory Plaza Largest living wall in North America
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Longwood Gardens
East Conservatory Plaza
Drip irrigation waters the plant material on
all the walls
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Maintenance Observe and inspect the drip system regularly
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Maintenance Inspect and clean the filters to maintain optimum emitter performance
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Maintenance If buried, winter freeze often pushes tubing to the surface requiring the tubing to be reburied and stapled.
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Handy tool to check soil moisture
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Easy Drip for the Garden and Landscape Check your water supply Select equipment appropriate for your
soil and plants Try it out before you bury anything Don’t be afraid of mistakes!
That’s why they make “goof plugs” Have fun and grow a bumper crop