JWSUSA Installation Irrigray

8/9/2019 JWSUSA Installation Irrigray

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IrriGRAY is the only complete dripperline irrigationpackage specifically designed to be used in conjunction

with Graywater Diversion Devices.

With over 5 years use, in many thousands of installations,IrriGRAY is proven to deliver graywater efficiently and evenlyacross the entire irrigation area.

Click here for IrriGRAY technical specifications.

Installation Instructions: IrriGRAY dripperline

Just Water Savers USAwww.besthomewatersavers.comwww.justwatersaversusa.com

Installation Instructions

Step 1

Calculate the average amount of graywater per person

Use the Irrigation calculator todetermine the optimumirrigation area

Step 2

Garden InspectionDetermine the total garden area to be irrigated:

Add up all the garden areas to be irrigated (shown in the bottomimage as areas of brown).

Compare this area with optimum area derived from the irrigationcalculator.

If the garden area is too small for the amount of graywatergenerated, consider reducing the number of plumbing fixturesconnected to the graywater system.

If there is too much garden area for the amount of graywater,either find additional water (makeup water) or reduce theamount of garden area to be irrigated.

If the total amount of graywater dripperline required is greaterthan 450 feet, the watering areas will need to be broken up intomultiple zones.

This is because the amount of water required to pressurize thedripperline would exceed the volume of graywater normallygenerated in a typical house at any one time.

If the garden is small and only requires 150' or less of dripperline, consider doubling up the dripperline.

150' of dripperline will only allow up to 5 gallons per minute to beirrigated, no matter how powerful the pump.If graywater might be generated at 10 gallons per minute, andcan only be irrigated at 5 gallons per minute, graywater couldbuild up in the collection container and overflow to the sewer /septic.

Content copyright 2009-2010. Just Water Savers USA Inc. All rights reserved

click on theimage to go tothe calculator web page

http://www.besthomewatersavers.com/pages/IrriGRAY-Technical-Specification.html


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http://www.besthomewatersavers.com/pages/Graywater-Irrigation-Coverage-Calculator.html








Soil Type Separation

Gravel and Sands 1.8 Feet

Sandy Loams 1.8 Feet

Loams 2.4 Feet

Clay Loams 2.7 Feet

Light Clays 3.0 Feet

Medium to Heavy Clays 4.5 Feet

Step 3

Irrigation supply line planning

How will the graywater be supplied tothe dripperlines?

Step 4

Dripperline layout planning

A simple installation may involve a graywater diversion device locatednear a side fence, in an area of very low traffic. The 3/4" LDPE supplytube can be led directly to the fence, and along the side boundary asrequired.

Where a graywater diversion device has been installed on a concretedriveway, or a concrete path at the rear of the house, other optionsshould be considered.

If the floor of the house is elevated (i.e. has usable subspace),

the supply line can be fed under the house – typically through sub floorvents – and emerge at the required garden location. Use of schedule 40pipe is recommended in place of 3/4" polyethylene under a house, toavoid crush damage by contractors in the future.

Supply line can also be run overhead e.g. along the roof of a garage /carport, or over the top of a fence / gate (ensure the pump in thegraywater diversion device has sufficient head pressure to lift water tothese heights).

Important: 3/4” supply line is preferable to 1” supply line, because the1” tube holds twice as much graywater as 3/4” tube. 1” line thereforerequires more graywater to be generated before the dripperlinesbecome pressurized.

The density of dripperline in a garden bed is determined by the soil

type.

As an example, a 6’ wide garden bed with light clay soil requires 2dripperlines (3.0’ separation - 1 line 1.5’ from the edge, then 3’ to thenext dripperline , leaving 1.5’ from the other edge).

Important: With daily irrigation of graywater, capillary irrigationensures the garden bed has a consistent moisture profile. Because of this, the intention is to water the soil, NOT individual plants. Click here to read about capillary irrigation




http://www.besthomewatersavers.com/pages/Capillary-Action-Effects.html







Inlet Pressure Nominal flow Max Lateral LineLength

3' 0.7 GPH 52'

6' 0.9 GPH 56' 15' 1.4 GPH 56'

30' 1.9 GPH 59'



Step 4 (continued)

Dripperline layout planning

Step 5

Installation

Layout Considerations:

The maximum lateral line length can be doubled IF the dripperline isconnected to the supply line at BOTH ends of the dripperline.

If there is a substantial fall over the irrigated area, where possible try tolocate dripperlines along the contour.

Substantial grade (greater than 10%)

A graywater diversion system with a 3/4 hp dirty water submersiblepump will provide sufficient dripperline pressure for up to 20feet differential height in the dripperlines. However, when the pumpstops, water already in the dripperlines will naturally flow towards thelowest emitter. Non return valves may be required in uphill supply lines.Only use swing check valves - sprung check valves provide too muchflow resistance.

If a contour can’t be followed (e.g. a long narrow garden bed running

down a slope), lay supply line along the length of the garden bed, with anumber of short dripperlines connected, instead of a single longdripperline.

Ornamental / Fruit trees Trees located in a general lawn area often require more water thanthose located in garden beds. Cut a slot in the grass to run supply line,and then connect dripperline in a full circle under the foliage extents.

Cool / Moist areas Some garden beds will require much less water than the majority of thegarden – typically, narrow garden beds shaded by the house for most of the day. Inserting a 16mm valve into the head of the dripperline willallow the householder to vary the flow to such areas as required.

Install the supply line and flush the lines if dirt or mud enteredthe tubing during installation.

Layout all dripperlines in their approximate locations, on the soilsurface.

After laying around plants and trees, connect to the supply lines andpeg into place.

Take care rolling out the dripperline from the coil. If the line isremoved from the coil by pulling instead of unrolling, a helix twistwill stay in the tube, preventing the dripperline from laying flat.

Cover the dripperline and garden with at least 2” of mulch,

for both code adherence and water conservation bestpractice.






JWSUSA Installation Irrigray

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