AMX RADIA LIGHTING CONTROL ENCLOSURE WORKSHEET GUIDE Specifications download pdf (Page 43)

6. Determining Programmable Settings

Rain Bird

ET Manager Series - Installation and Operation Manual 43

station run times, while exposure areas that would

decrease the rate of evaporation may be fine with

shorter station run times.

Slope

When sprinklers apply water faster than the soil can

absorb, water can run-off. Sloping landscapes increas-

es the chance of run-off occurring. Frequent watering

cycles programmed in the sprinkler controller can min-

imize this problem. The ET Manager will allow the

sprinkler controller to operate multiple watering cycles

to prevent run-off. This method of watering, often

referred to as cycle and soak, is preferred because it

prevents run off.

Landscape Conditions

Landscape conditions determine how much and how

often your landscape should be watered. Three land-

scape factors, plant type, soil type, and root depth, are

essential in a site assessment. Using these factors you

can accurately program your ET Manager to your spe-

cific landscape needs.

Plant Type

Plants need water to transport nutrients for cell devel-

opment and temperature control. Different plant types

respond to changing environmental conditions in dif-

ferent ways. For example, cool season grasses respond

to high evaporation rates by going into dormancy dur-

ing the hottest days of the year. Other plants like

shrubs tend to have deeper roots and can sustain high-

er evaporation than grass by accessing water deeper in

the soil.

It is important to understand what plant types are

included in the landscape. As stated previously Valve

Group A is typically assigned to lawn stations and Valve

Group B is typically assigned to shrub stations. These

different plant types use water at different rates requir-

ing different Irrigation Amounts and Landscape

Adjustment Percentages.

Soil Type

Soil is a habitat for soil organisms and plant roots. It

functions as a storehouse for nutrients and a water

reservoir. It contains and supplies water, oxygen, nutri-

ents, and provides mechanical support for plant

growth.

Soil type and root depth largely determine the amount

of water that can be stored in the soil. There are several

ways to determine soil type, i.e. sand, loam, clay, etc. A

laboratory soil test can provide exact information. Soil

type can be determined by a simple feel test; see

Appendix IV for the diagram.

Root Depth

Plant roots draw water from the soil. Deeper roots

increase the availability of water for the plants because

plants with deep roots can access water at greater soil

depths, see Figure 13. Use a shovel or soil probe to

determine your plant root depth.

Note: During plant establishment, the plant root depth

increases. Because roots will grow deeper during estab-

lishment, the Irrigation Amount will need to be

increased accordingly. The result will be to water less

frequently, as the plant roots grow deeper.

Figure 13. Deep Roots

vs. Shallow Roots

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