Advertisement
SIzE OF THE ABSORPTION FIELD
The total size of the absorption area depends on the daily
wastewater flow and the absorption capability of the soil.
1.
Determine the estimated daily flow. The local health depart-
ment will have guidelines for determining residential flows.
2.
Determine the loading rate of the soil. The local health
department will have guidelines for loading rate per soil con-
ditions. Qualified persons should conduct soil and site
evaluations only. After evaluation of the soil, the hydraulic
loading rate is established using the appropriate table (USDA
soil classes or State approved tables).
3.
Calculate the total area necessary for the absorption field with
the following equation:
Area =
Daily flow
Soil Loading Rate
4.
Determine the total length of the emitter line required in the
absorption area. Spacing between laterals is normally 24
inches.
Total Absorption Area in Square Feet =
Emitter Line Spacing
5.
Determined the layout of the emitter line absorption field.
When selecting the layout of the field, always place the
emitters along the contours of the ground area, keeping the
emitter line lateral runs as close to the same grade as pos-
sible. When running a continuous emitter line that requires
a loop, make a connection to solid flex pipe to prevent the
emitter line from kinking.
6.
The ECODRIP 8115-1/2HP drip system is capable of zone
sizes as indicated on Table 1. Using two or more zones keeps
the pump HP to a minimum.
The ECODRIP 8230-1HP drip system is capable of zone sizes
as indicated on Table 1. Using two or more zones keeps the
pump HP to a minimum.
7.
The ECODRIP 8115-1/2 HP drip system utilizes a 1/2 HP
dosing pump. The ECODRIP 8 8230-1HP drip system utilizes
a 1HP-dosing pump.
8.
A pressure regulator is furnished and should be installed at
the drip grid supply header at each zone. The pressure regu-
lator will provide proper pressure to the emitters.
9.
The requirement of flushing the emitter lines, using the
8115-1/2HP, is important so that proper velocities be main-
tained through the entire system. The supply line from the fil-
ter unit to the emitter supply manifold should be as indicated
on drawings to reduce the friction loss to a minimum and
keep the velocity above 2 feet per second. Each zone must
not have more than indicated on Table 1. This will ensure
that each lateral will receive a minimum of 1.69 gallons per
minute during a flush cycle. The return line is also an integral
part of the system and must be sized for minimum friction
loss and velocities above 2' feet per second.
The requirement of flushing the emitter lines, using the
8230-1HP, is important that proper velocities be maintained
through the entire system. The supply line from the filter unit
10. A hydraulic zoning valve is typically furnished to automate the
11. Solenoid valves can be used to automate the switching of
Total Emitter
The instantaneous water application rate of the system must not
Line Required
exceed the water absorption capacity of the soil. A determination
of the instantaneous water absorption capacity of the soil is
difficult; it varies with the water content of the soil. As the soil
approaches saturation with water, the absorption rate reduces to
an equilibrium rate called the "saturated hydraulic conductivity."
Long-Term Soil Textural Classes Long-Term Acceptance Rate
Soil Group (USDA Classifications)
I
II
III
IV Clays, Sandy Clay
Absorption Field Required per 100 Gallons of Wastewater
6
to the emitter supply manifold should be as indicated on
drawing to reduce the friction loss to a minimum and keep
the velocity above 2 feet per second. Each zone must not
have more than indicated on Table 1. This will ensure that
each lateral will receive a minimum of 1.69 gallons per
minute during a flush cycle. The return line is also an integral
part of the system and must be sized for minimum friction
loss and velocities above 2' per second.
switching of zones. The simplicity of design and a minimum
number of moving parts ensure ease of maintenance and a
long service life. The four-outlet model has interchangeable
cams for 2, 3, or 4 zone operation. It is important that each
zone be of equal size. An absorption field with more than one
zone will be dosed equally. The flushing cycle for multiple
zones will be in sequential pump starts to ensure that each
zone is flushed. Check valves are required to isolate each
zone in a multiple zone system.
zones and allow for different dosing times of each zone.
Contact factory for details.
Sands (with S or PS
structure & clay mineralogy)
Coarse Loams, Sandy Loam
(with S or PS Loam structure
& clay mineralogy)
Fine Loams, Sandy Clay
Loam (with S or PS structure
& clay mineralogy)
(with S or PS structure
& clay mineralogy)
Loading Rate
Square Feet
0.4
250
0.3
333
0.15
666
0.1
1000
0.05
2000
GPD/ft2
0.4
0.3
0.15
0.1 – 0.05
Linear Feet
125
167
333
500
1000
Advertisement
