Design Guide

_____________________________________________________________Landscape Dripline Design
■ Terminology
Manifold — a group of control valves located together in the same area.
O.D. — the abbreviation for “outside diameter.”
PSI — the abbreviation for “pounds per square inch;” unit of measure for
water pressure.
PVC Pipe — Poly Vinyl Chloride pipe; the most common pipe used in irrigation
systems.
P.O.C. — abbreviation for “point of connection.” This is the location on the
irrigation system where a tap is made for connection of a backflow prevention
device or water meter.
Potable Water — water used for drinking purposes.
Reclaimed Water — domestic wastewater that has been treated to a quality
suitable for a beneficial use and is under the direct control of a
treatment plant.
Remote Control Valve — the component in the irrigation system that regulates
the on/off of water from the main line to the driplines; activated by the
controller.
Service Line — the pipe supplying water from the city water main to the
water meter.
Spacing — the distance between the emitters or the driplines.
Static Water Pressure — the pressure that exists in a piping system when there is
no flow; measured in pounds per square inch (PSI).
Subsurface Grid — a group of parallel, inline driplines that are connected to
supply manifolds and flush manifolds.
Supply Manifold — the pipe connected to the remote control valves that
supplies water to the driplines within a subsurface grid.
Surge — the build-up of water pressure in a piping system due to certain
characteristics of the pipe, valves and flow.
TDS — the abbreviation for “total dissolved solids.” The sum of all inorganic
and organic particulate material within a given amount of water. TDS is an
indicator test used for wastewater analysis and is also a measure of the mineral
content of bottled water and groundwater.
TSS — the abbreviation for “total suspended solids.” The sum of all non-
dissolved inorganic and organic material within a given amount of water. The
other component of Total Solids (TS) in water are Total Dissolved Solids, so
generally TSS + TDS = TS.
Velocity — the speed at which water flows through the piping system; measured
in feet per second (FPS).
Wastewater — water containing waste including grey water, black water or
water contaminated by waste contact, including process-generated and
contaminated rainfall runoff.
Water Main — the city water pipe located in the street or right-of-way.
Water Pressure — the force of water that exists in a piping system; measured in
pounds per square inch (PSI).
Working Pressure — the remaining pressure in the irrigation system when all
friction losses are subtracted from the static pressure.
Zone — a subsurface grid or area of dripline that is controlled by the same
remote control valve.
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