Full Product Manual

Table Of Contents
Glossary Page 97
microclimate a small sub-climate within a project site created by adjacent hardscape, a shade tree or
exposure.
micro-spray a low-volume emission device that operates similarly to a conventional sprayhead, but
much lower flow rates; microsprays are used to water an entire hydrozone rather than
individual plant root zones.
mixed hydrozone a hydrozone in which the plants have different water needs. When plants having
different watering needs are grouped together, emission devices will be different for ea
c
plant. In many cases, the emitters will be matched for the individual plant needs so th
a
the plant group may be watered on the same valve.
multi-outlet emission
device
a low-volume emission device that contains several drip emitters connected to
1/4" distribution tubing; the tubing is then run to several different plants.
planting scheme the arrangement of plants within a hydrozone; the planting scheme can refer to a dense
o
sparse configuration, or to matching or mixing by watering needs.
polyethylene tubing See 1/2" polyethylene tubing.
potential
evapotranspiration
(PET)
the amount of water that is used by the combination of evaporation from the soil and
transpiration from plants growing in the soil; PET is generally expressed in inches per
day.
retrofit the process of changing an existing conventional irrigation system into a low-volume
system.
soil types types of soil determined by their composition; soil is made up of sand, silt and clay
particles, the percentage of each determines the soil type. Soil type will affect the
irrigation design and watering schedule.
—clay a medium-fine textured soil that usually forms very hard lumps or clods when dry and i
s
quite plastic and sticky when wet; when the moist soil is pinched between the thumb a
n
finger, it will form a long, flexible ribbon. Some clays are very high in colloids, are
friable, and may lack plasticity at all conditions of moisture.
—clay loam a moderately fine textured soil that usually breaks into clods or lumps that are hard
when dry. When the moist soil is pinched between the thumb and finger, it will form a
thin ribbon that will break readily, barely sustaining its own weight. The moist soil is
plastic and will form a cast that will bear much handling. When kneaded in the hand,
does not crumble readily, but tends to work into a heavy compact mass.
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