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Office of Sustainability and the Environment
                          Watershed Management Section
                          200 Santa Monica Pier, Suite C
                          Santa Monica, CA 90401
                          russell.ackerman@smgov.net
                          (310) 458-8972 ext 2


Strategies for Eliminating Irrigation Overspray and Runoff
Santa Monica Municipal Code 7.16.020 and 8.108 Subpart B prohibit irrigation
overspray and/or runoff onto hardscapes such as gutters, streets or alleys.
Any changes to your irrigation system must be in compliance with the Green
Building Ordinance – visit www.sustainablesm.org/landscape for more info
Overspray -- Spray irrigation devices require frequent maintenance and
adjustment to keep their spray directed where you want it.
Here are five strategies for mitigating or eliminating overspray:
1. If your landscape is composed of individual plants, such as shrubs, rather
than continuous groundcover like turf; convert your spray system to drip
irrigation.
2. Relandscape with individual plants (one-gallon size or larger). You must
convert the spray system to drip irrigation (with emitters 2 gph or less).
3. Replace the plant material with a permeable, non-living groundcover such
as decomposed granite that will not require irrigation.
4. Install a buffer strip of permeable, non-living groundcover such as
decomposed granite between the plant material and the hardscape. You must
move the sprinkler heads inward 24 inches to the edge of the planting bed.
(See drawing below) Because of the possibility of wind and misadjustment,
this solution is not fool-proof.



      .   =   sprinkler




                                                                      24“




                                                                    MORE >>>
5. Install a non-spray irrigation system such as ECS, SurfaceFlow, KISSS or
subsurface drip. See RESOURCES below. Note that these systems may be
relatively costly.

Runoff results from overspray onto hardscape, application of water faster
than the soil can absorb it and/or application of more water than the soil can
hold.

Here are some strategies for eliminating runoff:
1. If the application rate is too fast –
        A. Adjust your irrigation controller to apply the water in several short
        cycles with a soak-in period between cycles. This is especially
        important if the planting area is sloped.
        B. If your landscape is several years old, have the soil aerated.
        C. If your landscape is turf, have it dethatched. Your gardener should
        be able to do this.
        D. If your irrigation system is composed of sprayheads (fixed spray
        patterns of quarter, half and full circles) with eight-foot or greater
        radius, change to rotor-type nozzles. See RESOURCES below.

2. If you are applying too much –
        A. Adjust your irrigation controller. Use the Watering Calculator at
        http://www.bewaterwise.com for guidance.
        B. Install a weather-sensitive irrigation controller that will automatically
        adjust itself for weather changes. See RESOURCES below.


RESOURCES
Rotor-Type Nozzles
      MP Rotator           http://mprotator.com
      Rain Bird            http://www.rainbird.com
Non-Spray Watering Systems
      SurfaceFlow          http://jardinier-asis.com/turf.html
      ECS                  http://www.ecsgreen.com
      KISSS                http://www.kisssusa.com/
      Subsurface Drip Products
             Geo-Flow      http://www.geoflow.com/landscape.html
             Netafim       http://www.netafim-usa-landscape.com/Landscape/
Explanation of Aeration
             http://ag.arizona.edu/pubs/garden/mg/lawns/aeration.html
Explanation of Dethatching
             http://ag.arizona.edu/pubs/garden/mg/lawns/dethatching.html
Examples of equipment for converting sprinklers to drip -
             http://www.rainbird.com/drip/products/control/retrofit_kit.htm
Examples of weather-based controllers –
             http://www.irrigation.org/SWAT/Industry/ia-tested.asp

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Strategies for Eliminating Irrigation Overspray and Runoff - Santa Monica, California

  • 1. Office of Sustainability and the Environment Watershed Management Section 200 Santa Monica Pier, Suite C Santa Monica, CA 90401 russell.ackerman@smgov.net (310) 458-8972 ext 2 Strategies for Eliminating Irrigation Overspray and Runoff Santa Monica Municipal Code 7.16.020 and 8.108 Subpart B prohibit irrigation overspray and/or runoff onto hardscapes such as gutters, streets or alleys. Any changes to your irrigation system must be in compliance with the Green Building Ordinance – visit www.sustainablesm.org/landscape for more info Overspray -- Spray irrigation devices require frequent maintenance and adjustment to keep their spray directed where you want it. Here are five strategies for mitigating or eliminating overspray: 1. If your landscape is composed of individual plants, such as shrubs, rather than continuous groundcover like turf; convert your spray system to drip irrigation. 2. Relandscape with individual plants (one-gallon size or larger). You must convert the spray system to drip irrigation (with emitters 2 gph or less). 3. Replace the plant material with a permeable, non-living groundcover such as decomposed granite that will not require irrigation. 4. Install a buffer strip of permeable, non-living groundcover such as decomposed granite between the plant material and the hardscape. You must move the sprinkler heads inward 24 inches to the edge of the planting bed. (See drawing below) Because of the possibility of wind and misadjustment, this solution is not fool-proof. . = sprinkler 24“ MORE >>>
  • 2. 5. Install a non-spray irrigation system such as ECS, SurfaceFlow, KISSS or subsurface drip. See RESOURCES below. Note that these systems may be relatively costly. Runoff results from overspray onto hardscape, application of water faster than the soil can absorb it and/or application of more water than the soil can hold. Here are some strategies for eliminating runoff: 1. If the application rate is too fast – A. Adjust your irrigation controller to apply the water in several short cycles with a soak-in period between cycles. This is especially important if the planting area is sloped. B. If your landscape is several years old, have the soil aerated. C. If your landscape is turf, have it dethatched. Your gardener should be able to do this. D. If your irrigation system is composed of sprayheads (fixed spray patterns of quarter, half and full circles) with eight-foot or greater radius, change to rotor-type nozzles. See RESOURCES below. 2. If you are applying too much – A. Adjust your irrigation controller. Use the Watering Calculator at http://www.bewaterwise.com for guidance. B. Install a weather-sensitive irrigation controller that will automatically adjust itself for weather changes. See RESOURCES below. RESOURCES Rotor-Type Nozzles MP Rotator http://mprotator.com Rain Bird http://www.rainbird.com Non-Spray Watering Systems SurfaceFlow http://jardinier-asis.com/turf.html ECS http://www.ecsgreen.com KISSS http://www.kisssusa.com/ Subsurface Drip Products Geo-Flow http://www.geoflow.com/landscape.html Netafim http://www.netafim-usa-landscape.com/Landscape/ Explanation of Aeration http://ag.arizona.edu/pubs/garden/mg/lawns/aeration.html Explanation of Dethatching http://ag.arizona.edu/pubs/garden/mg/lawns/dethatching.html Examples of equipment for converting sprinklers to drip - http://www.rainbird.com/drip/products/control/retrofit_kit.htm Examples of weather-based controllers – http://www.irrigation.org/SWAT/Industry/ia-tested.asp