007.04.21 Ark. Code R. § 001 - Rules Pertaining to Drip Dispersal Systems
SECTION 1.
Authority and
Purpose
1.1 The following
RULES PERTAINING TO DRIP DISPERSAL SYSTEMS are duly adopted and promulgated by
the Arkansas State Board of Health pursuant to the authority expressly
conferred by the laws of the State of Arkansas including, without limitation.
Act 96 of 1913 (A.C.A. (20-7-109)
, and Act 402 of 1977 (A.C.A. (14-236-101) et.
seq.)
1.2 Purpose: A drip dispersal
system is a technology for the distribution of treated wastewater uniformly
over a large area beneath the soil surface. Drip Dispersal fields are a "bed"
design. The use of four (4) to six (6) inch installation cover does not fit the
conventional trench design criteria utilized in the Onsite Wastewater Soil
Morphology Program for system design.
SECTION 2.
Definitions
2.1
Aerobic Treatment Unit
(ATU): A mechanical on-site treatment unit that provides secondary
wastewater treatment by mixing air and aerobic and facultative microbes with
the wastewater. ATU's typically use a suspended growth treatment process or a
fixed treatment process.
2.2
Air/Vacuum (A/V) Relief Valve: A valve that automatically lets air
out of or into liquid carrying pipe as needed in response to changes in system
pressure.
2.3
Aerobic:
Having molecular oxygen as a part of the environment, or growing or occurring
only in the presence of molecular oxygen.
2.4
Backwash: The process of
flow reversal to clean a filter and to restore it to the normal clean condition
for filtering with a minimum resistance to flow through the media or
screen.
2.5
Control
Panel: An electronic control panel that controls the quantity and time
of dose. This can also control the zone receiving the effluent, automatically
flushes the lines, flushes the filters, monitors the flow rates and pump run
cycles or times.
2.6
Decentralized System: An onsite and/or cluster wastewater system
used to treat and disperse or discharge small volumes of wastewater, generally
from dwellings or businesses that are located relatively close
together.
2.7
Disk
Filter: A type of filter that utilizes a series of grooved rings that
overlay each other to form a network of very small openings to trap
contaminants.
2.8
Distributing Valve: A valve that distributes flow to multiple
drain field laterals, zones or locations by automatically rotating upon each
pump cycle.
2.9
Drain-back: The process of effluent draining along the laterals
and manifolds after the pump shuts off. Drainage occurs both inside and outside
the drip tubing and manifolds to lower elevations in the drip field.
2.10
Drip Line: Tubing
constructed from polyethylene with emitters embedded regularly along the length
of the tube.
2.11
Effluent: Sewage, water or other liquids, partially or completely
treated or in its natural state flowing out of a septic tank, aerobic treatment
unit, or other treatment system or systems.
2.12
Emitters: Small diameter
openings in drip line that can dissipate pressure and allow a slow, controlled
discharge normally rated in gallons per hour.
2.13
Field Flush: Water is
passed through the drip lateral for the purpose of removing particles and other
debris from the walls of the drip tubing. The flush water is carried back
through the return manifold and return line to the pretreatment unit.
2.14
Filter: A device for the
main purpose of removing suspended solids and other debris from the
wastewater.
2.15
Hydraulic
Conductivity: The rate of water movement under unit gradient in a
specific soil horizon.
2.16
Interceptor Drain: A subsurface drain line, usually constructed
upgrade from the absorption area to divert seasonal groundwater.
2.17
Lateral: One single run or
multiple runs of drip tubing connected at one end to a supply manifold and the
other end connected to a return manifold.
2.18
Maintenance Personnel: A
individual certified by the Department to conduct assessments under the Onsite
Maintenance and Monitoring Program.
2.19
Monitoring: Periodic
inspection of system for performance.
2.20
Pressure Compensating (PC)
Emitters: Drip emitters that allow a constant flow or discharge over a
wide range of applied pressure.
2.21
Pressure Distribution: A
system of small diameter pipes equally distributing effluent through a trench
or bed.
2.22
Pressure
Regulator: A device used to regulate and maintain a constant discharge
pressure.
2.23
Pretreatment: The conditioning of effluent prior to dispersal by a
drip system.
2.24
Return
Line: The return line connects the return manifold to the pretreatment
unit for the purpose of carrying flush water from the drip field.
2.25
Return Manifold: A
collection manifold or piping that returns excessive wastewater and debris to
the primary treatment tank during system flushes.
2.26
Run: One continuous length
of tubing routed across contour connected to a supply line or return line or
another run.
2.27
Soil
Structure: The combination or arrangement of individual soil particles
in definable aggregates, or peds, which are characterized and classified on the
basis of size, shape, and degree of distinctness.
2.28
Solenoid Valve: An electric
valve actuated by a solenoid, used for controlling the flow or liquid in
pipes.
2.29
Spin
Filter: A filter that consist of a screen cylinder enclose in a casing.
The typical filter screen mesh size is 150 and a micron rating of
100.
2.30
Static Plow:
A drip line plow with a shank that remains at a given depth as the plow is
pulled through the soil.
2.31
Supply Line: The line that extends from the pump to the supply
manifold of a given zone.
2.32
Supply Manifold: The supply manifold connects the supply line to
the drip laterals.
2.33
Vertical Separation: The depth of unsaturated, original,
undisturbed soil between the bottom of the drip tubing and highest seasonal
water table or restrictive layer.
2.34
Vibratory Plow: A vibratory
plow is a drip line plow with a shank that vibrates vertically as the plow is
pulled through the soil.
2.35
Water Table: The level in saturated soil at which the hydraulic
pressure is zero.
2.36
Zone: A group of laterals that are dosed at the same
time.
SECTION 3.
Site Assessment
3.1 Subsurface Drip System(s) may be utilized
on sites that meet the following criteria:
3.1.1 The drip tubing or installed trench
bottom shall be above the seasonal water table, whatever the duration. Brief
seasonal water tables may be minimized or eliminated by the use of effective
interceptor drains. Any design, which incorporates the use of an interceptor
drain, shall indicate the effective depth of seasonal water table
reduction.
3.1.2 Low hydraulic
conductivity shall include soils with 40% or greater clay. Clay percentage
shall be determined from in depth zone extending 6" above and 12" below
installed drip tubing depth.
3.1.3
No loading rates are available for low hydraulic conductivity soils with
greater than 60% clay.
3.1.4
Systems utilizing drip dispersal must maintain minimum of 9" separation between
drip tubing and any rock substrata (consolidated or fractured) for soils that
exhibit a moderate and/or long SWT.
3.1.5 Systems utilizing drip dispersal must
maintain minimum of 15" separation between drip tubing and any rock substrata
(consolidated or fractured) for soils that exhibit only a brief SWT or do not
exhibit a SWT.
3.1.6 Soils that are
structure less or with massive structure shall not be approved for onsite
sub-surface treatment.
3.1.7 The
lot size shall be of sufficient area to accommodate both the primary and
secondary dispersal area.Both the primary and secondary dispersal area shall be
sized according to the respective loading rates. If the lot can only support
the primary dispersal field, a subsurface drip dispersal system shall not be
installed.
SECTION
4.
Drip Tubing and Emitters
4.1 Emitter spacing can range from six (6) to
twenty-four (24) inches. The emitters used in the tubing shall be pressure
compensating. Pressure compensating emitters have a relatively constant
discharge rate over a wide range of pressures. Emitter flow
rate shall be specified by the designer and stated on the system plans. The
drip line pressure can range from 5 to 70 pounds per square inch
(PSI).
4.2 Drip tubing shall be
installed by one of the following methods; static plow, chain trencher or
vibratory plow.
4.3 Static plow is
the preferred method for inserting drip tubing into the soil. The static plow
shall be pulled not pushed through the soil.
4.4 Chain trencher may be used for placement
of the drip tubing in the soil. The maximum chain trench width is four (4)
inches.
4.5 Wet soil shall not be
plowed because of smearing.
4.6
Drip tubing installed in natural soil shall be installed to a depth of six (6)
inches.
4.7 If capping fill
material is used as part or all of the cover over the tubing,
the installed depth of the tubing can range from one (1) to five (5) inches in
the natural soil. Drip tubing shall not be placed in the capping fill material.
In no case shall the cover over the tubing be less than six
(6) inches.
4.8 Settled depth of
the cap shall not be more than eight (8) inches. The capping fill material
shall not contain more than 27% clay or 60% sand or 70% silt. Before the
capping fill material is delivered to the proposed dispersal site, a textural
analysis shall be provided. A credit of up to 50% of the settled cap depth may
be allowed in the adjustment of the seasonal water table. The seasonal water
table credit is at the sole discretion of the Department.
SECTION 5.
Pretreatment
Requirements
5.1 The
quality of effluent that will be applied to the dispersal field shall meet the
Ameriean National Standards Institute/National Sanitation Foundation (ANSI/NSF)
Standard 40 (revised 2005) requirements for elass 1 treatment systems. Only
pretreatment units that have obtained approval from the Department shall be
used.
5.2 Pretreatment system shall
be required as part of any Drip Dispersal System design.
5.3 The daily flow rate capaeity of a
pretreatment system shall equal or exceed the daily flow rates found in
Appendix B of the Rules and Regulations Pertaining to Onsite Wastewater
Systems.
5.4 Pretreatment systems
installed in conjunction with an individual residential structure shall have a
daily flow rate capacity of not less than 400 gallon per day.
5.5 Pretreatment systems installation on
non-residential or multi-structures shall be sized according to influent
wastewater strength and total daily flow rate expressed in gallons per
day.
SECTION 6.
Filters and Screens
6.1 There are three types of filters or
screens used for wastewater applications: spin or screen filter, disk, and
sand.
6.2 Solids and other debris
shall be filtered to a size of 100 microns or less.
6.3 Filter debris shall be returned to the
septic tank, pretreatment unit, or a separate settling tank regardless of the
type of filter system. The clear Schedule 40 PVC piping allows for a direct
observation of the wastewater as it flows from the filter flush line or the
field flush line.
SECTION
7.
Control Panel
7.1 Timed dosing is the only method for
controlling the dose cycles and volumes.
7.2 Control panels shall be constructed of
the following basic components; NEMA 4X rated enclosure, motor-start
contractors, separate circuit breakers for pump and panel control, audio and
visual alarms, and wiring terminals. Optional components range from elapsed
time meter or counters, event counters and pump run lights.
SECTION 8.
Flow
Meters and Pressure Gauges
8.1 A flow meter shall be installed after the
filter system but before the drip dispersal field. The flow meter shall
incorporate not only a rate of flow gauge but also a total gallons pumped
register. The flow rate gauge and total gallons pumped register may be separate
devices. The flow meter shall be installed in a protective box that will be of
sufficient size for servicing the meter and to allow easy access for reading
the meter. The flow meter shall be sized for the dispersal flow as well as the
additional field flushing volume.
8.2 Pressure gauges shall be located before
the filter, after the filter and on the dispersal field return line. Pressure
gauges shall be enclosed in the head works box, which allows easy access for
observation. The gauges shall be liquid filled and a minimum of three (3)
inches in diameter. The pressure range of the gauge shall be sufficient for the
maximum pressure that will be expected in the system.
SECTION 9.
Supply Line and
Manifold
9.1 The supply
line and manifold should be designed with a flow velocity between the 0.5 feet
per and 5 feet per second.
9.2 The
piping and fittings in the supply line and the manifold shall be Schedule 40.
Schedule 80 fittings shall be used at the filter system as well as any point
where the piping will be discormected or subjected to abuse.
9.3 When dosing, the supply manifold shall
eliminate the drain back potential from a higher to a lower elevation in the
drain field.
SECTION 10.
Return Manifold and Line
10.1 The return manifold and line allow the
flushing of the drip dispersal field. The flushed wastewater and solids shall
be returned back to the settling tank or treatment tank.
SECTION 11.
Flexible Hose
and Tubing
11.1 Flexible
Schedule 40 PVC piping shall be used at all connections to the supply and
return manifolds.
SECTION
12.
Air/Vacuum Relief Valves
12.1 Air/vacuum relief valves provide a means
for releasing air at the start of a dose cycle, so the system will charge
quickly with wastewater and allow air to enter the system quickly at the end of
dose cycle. Air/vacuum valves shall be located at the highest points of either
supply or return manifolds, or both.
12.2 Air/vacuum relief valves shall be sized
based on the proposed design flow rate. A valve that is under sized will not
provide an adequate amount of airflow.
12.3 A Schrader valve shall be provided at
each vacuum valve as a means of checking the pressure of the drip
field.
SECTION 13.
Flushing Valves
13.1 Automatic flushing controls shall be
required for all drip systems. The flush valve shall be a solenoid or a
pressure/flow compensating valve. Manual flushing valves may be installed in
the field flush line. Manually operated valves may be standard ball or gate
valves. The flush valve shall be fully opened during a flush cycle, regardless
of the valve type. The field flushing velocity shall be in accordance with the
drip tubing or system manufacturer's recommendations. The minimum field
flushing velocity shall not be less than 0.5 feet per second.
SECTION 14.
Pipe
and Specialty Connectors and Fittings Standard
14.1 PVC pipe, tubing, reducer tees,
adapters, elbows, couplers and compression fittings shall be constructed of
Schedule 40 PVC.
14.2 Lock-Slip
fittings, adapters, tees, elbows, and couplings shall be specifically
manufactured for use with wastewater drip dispersal systems.
14.3 Insert fittings, barbed adapters, tees,
elbows, and couplings shall be specifically manufactured and sized for use with
wastewater drip dispersal system.
SECTION 15.
Headworks
Boxes
15.1 Any component
or assembly that may need to be routinely serviced shall be located in a
headworks box that is readily accessible.
15.2 Headworks boxes may be constructed of
high-density PE (polyethylene) fiberglass, PVC, or concrete.
15.3 Headworks boxes shall be large enough to
allow ease of service and allow periodic removal and replacement of components
as needed. The headworks box shall be of sufficient length and depth to
accommodate the various components that will be housed in the box. The lid of
the headworks box shall extend above the finished grade. The bottom of the
headworks box shall be designed to drain any rainwater or wastewater away from
the inside of the box. The headworks box lid shall be easy to remove but also
shall be made tamperproof where access to the site is not restricted or
controlled. The structural strength of the headworks box and lid shall be
sufficient to withstand the weight of any lawn maintenance equipment or other
service equipment that may roll over the box. If the box will be subject to
excessive wheel loading, additional protection shall be provided.
SECTION 16.
Zones and Related Components
16.1 Automatic distributing valves shall
include clear Schedule 40 piping on the output of each zone.
16.2 Check valves shall not be required if
separate return lines are used to isolate returned wastewater to the
pretreatment system.
SECTION
17.
Pressure Regulators
17.1 Regulators shall be selected to allow
sufficient pressure and fiows for flushing. Pressure regulators shall be
designed for use in wastewater drip dispersal system.
SECTION 18.
System
Installation
18.1 Protect
the site prior to and after the installation of the drip system. Activities on
the site shall be limited only to what is necessary for the installation of the
system.
18.2 Any clearing or
grubbing shall be performed based on a site-specific plan, which minimizes the
disturbance of the soil and protects the overall soil characteristics. It may
be necessary to use flexible PVC tubing to work around or over objects in the
dispersal field; however, the number of emitters shall not be
reduced.
18.3 Drip tubing shall not
be installed when the soil is wet or frozen.
18.4 Drip tubing shall be installed on
contour.
18.5 Flexible Schedule 40
PVC tubing shall be used at each manifold connection to provide additional
crimping protection and to prevent the tubing from being pulled out of the
supply or return manifold as the soil settles.
18.6 Drip tubing shall be taped, plugged or
capped when cut. All piping shall be taped or capped at the end of the
construction day.
18.7 PVC pipe
cutters that cleanly shear the pipe or tubing shall be used rather than sawing
the pipe or tubing.
18.8 Complete
flushing of the supply line prior to the connection of the drip tubing shall be
performed. Sufficient volume of water shall be used to ensure all debris is
removed from both the supply line and the drip tubing.
18.9 A start-up system check shall be
performed before the system is placed in operation. All operational functions
that would be expected during routine operations shall be performed in a
specified time period of not less than 24 hours. This operational test shall
include but not be limited to: timed dose functions, volume loading, flow
rates, pressures at the inlet and outlet of each zone, pressures at the inlet
and outlet of filters, leak detection, flushing, and alarms.
18.10 Repairs or modifications shall be made
to eliminate any wet spot.
18.11
The establishment of a vegetative cover is critical to the overall performance
of a drip dispersal system. The dispersal area shall be covered with sod or
mulch as soon as possible after the installation of the drip tubing.
SECTION 19.
System Operation and Maintenance
19.1 Periodic servicing shall be required.
The frequency of the service period is dependent on the operational parameters
set for the system by its designer. The minimal service period shall not be
less than once every three (3) months.
19.2 Alarms resulting from mechanical break
downs shall be investigated and the situation causing the alarm
resolved.
19.3 Owners of Drip
Dispersal Systems are required to maintain a Maintenance and Monitoring
Contract with Maintenance Personnel certified by the Department for the life of
the system.
SECTION 20.
System Design
20.1 The following procedure shall be used to
determine the minimum surface area required for drip dispersal
system.
20.2 The depth and duration
of the seasonal water table shall be determined.
20.3 The sizing and loading rate chart found
in Table 1, 2 and 3 of this manual shall be used to determine the amount of
surface area required for installation.
20.4 The spacing between drip tube laterals
shall not be less than two (2) ft. Center to enter. Drip tube laterals spacing
may be greater than two (2) ft. however, for the purpose of determining the
length of tubing required for a dispersal field, all length calculation shall
be two (2) ft. center to center.
20.5 The effective area of the dispersal
field shall be calculated by dividing the daily wastewater flow rate (DWF) in
gallons per day (gpd) by the soil loading rate (SLR) in gallons per foot square
per day (g/ft ft'! d). [Area of the dispersal field (DF) = design wastewater
flow (DWF) soil loading rate (SLR).]
20.6 The length of the drip tubing shall be
determined by dividing the dispersal field (DF) required by the drip tube
spacing (DT) of two (2) Ft. [Drip tube length (DTL = dispersal field area (DF)
drip tube spacing (DT) of two (2) ft.]
20.7 The number of emitters required shall be
determined by dividing the drip tube length (DTL) by the emitter spacing (E)
ft. [Drip line lateral length (ft.) emitter spacing (ft.) = Number of
emitters.]
20.8 The loading rate
for a soil which has a rock substrata (consolidated or fractured) and no
seasonal water tables present above the rock substrata shall be sized as a
moderate seasonal water table.
SECTION
21.
Training and
Certification
21.1 All
Designated Representatives, Installers, Environmental Health Specialists, and
Certified Maintenance Personnel shall be certified in the design, construction,
and maintenance of a drip dispersal system. The certification program will be
provided or approved by the Department Onsite Wastewater Section.
SECTION 22.
Variances and Exemptions
22.1 Requested variations from these Rules
and Regulations will be considered and maybe approved at the sole discretion of
the Department.
22.2 Submission of
proposed experimental onsite wastewater systems may be approved, disapproved,
or approved on a trial basis for a specific period of time. Such approval or
disapproval shall be at the sole discretion of the Department. Submission of an
experimental design shall include data as to the efficiency of operation of the
proposed experimental system. A monitoring plan shall be submitted for approval
in addition to the system design.
22.3 Good management practices are additions
or modifications to systems which will make such systems more efficient, or
which could make such systems acceptable in certain soil conditions. Where good
management practices are proposed for inclusion in a drip dispersal system,
approval shall be at the sole discretion of the Department or its Authorized
Agent.
SECTION 23.
Fees
23.1 A fee shall be levied for the review of
individual drip dispersal system permit application pursuant to A.C.A. §
14-236-116.
23.2 For structures one thousand five hundred
square feet (1,500 sq. ft.) or less, the fee to review a permit application is
thirty dollars ($30.00).
23.3 For
structures more than one thousand five hundred square feet (1,500 sq. ft.) and
less than two thousand square feet (2,000 sq. ft.), the fee to review a permit
application is forty-five dollars ($45.00).
23.4 For structures more than two thousand
square feet (2,000 sq. ft.) and less than three thousand square feet (3,000 sq.
ft.), the fee to review a permit application is ninety dollars
($90.00).
23.5 For structures more
than three thousand square feet (3,000 sq. ft.) and less than four thousand
square feet (4,000 sq. ft.), the fee to review a permit application is one
hundred twenty dollars ($120.00).
23.6 For structures four thousand (4,000 sq.
ft.) and greater, the fee to review a permit application is one hundred fifty
dollars ($150.00)
23.7 For the
alteration, repair, or extension of any individual drip dispersal system, the
fee to review a permit application is thirty dollars ($30.00).
23.8 In calculating the square footage of a
residential structure for purposes of determining the applicable fee under this
section the square footage of all auxiliary areas of the residential structure
shall not be considered.
23.9
Auxiliary areas include garages, carports, porches, and other similar areas as
determined by the Department.
23.10
Non-individual or multi structure permit submittals shall include a Cost
Estimate Worksheet (EHP-17).
SECTION
24.
Penalties
24.1 Any person, firm, corporation or
association who violates any of the provisions of Act 402 of 1977, as Amended,
or any Rules and Regulations promulgated under the authority of Act 402 of
1977, as Amended, shall upon conviction, be deemed guilty of a misdemeanor and
shall be punished by a fine of not less than one hundred dollars ($100.00) nor
more than one thousand dollars ($1,000.00)
SECTION 25.
Severability
25.1 If any provisions of these Rules, or the
application thereof to any person is held invalid, such invalidity shall not
affect other provisions or applications of these Rules, which can affect
without the invalid provisions of application, and to this end the provisions
hereto are declared to be severable.
SECTION 26.
Repeal
26.1 All Regulations and parts of Regulations
in conflict herewith are hereby repealed.
SECTION 27.
Certification
This will certify that the foregoing Rules Pertaining to Drip Dispersal Systems were adopted by the Arkansas Department of Health at a regular session of the Board of Health on 28th of October, 2021.
|
TABLE 1 DRIP DISPERSAL FIELD SIZING AND LOADING RATE CHART FOR MODERATE HYDRAULIC CONDUCTIVITY SOILS |
|||||||
|
Brief SWT |
Mod SWT |
Long SWT |
|||||
|
DEPTH TO RMF (inches) |
(g/ft2/d) |
ft2/100 Gal./Day |
fe/ft2/d) |
ft2/100 Gal./Day |
(g/ft2/d) |
FT2/100 Gal./Dav |
|
|
1 |
0.021 |
4761.9 |
0.007 |
14285.71 |
0.003 |
33333.33 |
|
|
2 |
0.041 |
2439.02 |
0.014 |
7142.86 |
0.007 |
14285.71 |
|
|
3 |
0.062 |
1612.9 |
0.021 |
4761.9 |
0.010 |
10000 |
|
|
4 |
0.082 |
1219.51 |
0.027 |
3703.7 |
0.014 |
7142.86 |
|
|
5 |
0.103 |
970.87 |
0.034 |
2941.18 |
0.017 |
5882.35 |
|
|
6 |
0.123 |
813.01 |
0.041 |
2439.02 |
0.021 |
4761.9 |
|
|
7 |
0.144 |
694.44 |
0.048 |
2083.33 |
0.024 |
4166.67 |
|
|
8 |
0.164 |
609.76 |
0.055 |
1818.18 |
0.027 |
3703.7 |
|
|
9 |
0.185 |
540.54 |
0.062 |
1612.9 |
0.031 |
3225.81 |
|
|
10 |
0.205 |
487.8 |
0.068 |
1470.59 |
0.034 |
2941.18 |
|
|
11 |
0.226 |
442.48 |
0.075 |
1333.33 |
0.038 |
2631.58 |
|
|
12 |
0.246 |
406.5 |
0.082 |
1219.51 |
0.041 |
2439.02 |
|
|
13 |
0.267 |
374.53 |
0.089 |
1123.6 |
0.044 |
2272.73 |
|
|
14 |
0.287 |
348.43 |
0.096 |
1041.67 |
0.048 |
2083.33 |
|
|
15 |
0.308 |
324.68 |
0.103 |
970.87 |
0.051 |
1960.78 |
|
|
16 |
0,328 |
304.88 |
0.109 |
917.43 |
0.055 |
1818.18 |
|
|
17 |
0.349 |
286.53 |
0.116 |
862.07 |
0.058 |
1724.14 |
|
|
18 |
0.369 |
271 |
0.123 |
813.01 |
0.062 |
1612.9 |
|
|
19 |
0.390 |
256.41 |
0.130 |
769.23 |
0.065 |
1538.46 |
|
|
20 |
0.410 |
243.9 |
0.137 |
729.93 |
0.068 |
1470.59 |
|
|
21 |
0.431 |
232.02 |
0.144 |
694.44 |
0.072 |
1388.89 |
|
|
22 |
0.451 |
221.73 |
0,150 |
666.67 |
0.075 |
1333.33 |
|
|
23 |
0.472 |
211.86 |
0,157 |
636.94 |
0.079 |
1265.82 |
|
|
24 |
0.492 |
203.25 |
0,164 |
609.76 |
0.082 |
1219.51 |
|
|
25 |
0.513 |
194.93 |
0,171 |
584.8 |
0.085 |
1176.47 |
|
|
26 |
0.533 |
187.62 |
0,178 |
561.8 |
0.089 |
1123.6 |
|
|
27 |
0.554 |
180.51 |
0,185 |
540.54 |
0.092 |
1086.96 |
|
|
28 |
0.574 |
174.22 |
0,191 |
523.56 |
0.096 |
1041.67 |
|
|
29 |
0.595 |
168.07 |
0,198 |
505.05 |
0.099 |
1010.1 |
|
|
30 |
0.615 |
162.6 |
0,205 |
487.8 |
0.103 |
970.87 |
|
|
31 |
0.636 |
157.23 |
0,212 |
471.7 |
0.106 |
943.4 |
|
|
32 |
0.656 |
152.44 |
0,219 |
456.62 |
0.109 |
917.43 |
|
|
33 |
0.677 |
147.71 |
0.226 |
442.48 |
0.113 |
884.96 |
|
|
34 |
0.697 |
143.47 |
0.232 |
431.03 |
0.116 |
862.07 |
|
|
35 |
0.718 |
139.28 |
0.239 |
418.41 |
0.120 |
833.33 |
|
|
36 |
0.738 |
135.50 |
0.246 |
406.5 |
0.123 |
813.01 |
|
|
37 |
0.750 |
133.33 |
0.253 |
395.26 |
0.126 |
793.65 |
|
|
38 |
0.750 |
133.33 |
0.260 |
384.62 |
0,130 |
769.23 |
|
|
39 |
0.750 |
133.33 |
0.267 |
374.53 |
0,133 |
751.88 |
|
|
40 |
0.750 |
133.33 |
0.273 |
366.3 |
0.137 |
729.93 |
|
|
41 |
0.750 |
133.33 |
0.280 |
357.14 |
0.140 |
714.29 |
|
|
42 |
0.750 |
133.33 |
0.287 |
348.43 |
0.144 |
694.44 |
|
|
43 |
0.750 |
133.33 |
0.294 |
340.14 |
0.147 |
680.27 |
|
|
44 |
0.750 |
133.33 |
0.301 |
332.23 |
0.150 |
666.67 |
|
|
45 |
0.750 |
133.33 |
0.308 |
324.68 |
0.154 |
649.35 |
|
|
46 |
0.750 |
133.33 |
0.314 |
318.47 |
0.157 |
636.94 |
|
|
47 |
0.750 |
133.33 |
0.321 |
311.53 |
0.161 |
621.12 |
|
|
48 |
0.750 |
133.33 |
0.328 |
304.88 |
0.164 |
609.76 |
|
|
TABLE 2 DRIP DISPERSAL FIELD SIZING AND LOADING RATE CHART FOR LOW HYDRAULIC CONDUCTIVITY SOILS |
|||||||
|
Brief SWT |
Mod SWT |
Lone SWT |
|||||
|
DEPTH TO RMF (inches) |
(g/ft2/d) |
FT2/100 Gal./Dav |
(g/ft2/d) |
FT2/100 Gal./Day |
(g/ft2/d) |
FT2/100 Gal./Day |
|
|
1 |
0.014 |
7142,86 |
0,005 |
20000 |
0.002 |
50000 |
|
|
2 |
0.028 |
3571,43 |
0,009 |
11111,11 |
0.005 |
20000 |
|
|
3 |
0.042 |
2380,95 |
0,014 |
7142,86 |
0.007 |
14285,71 |
|
|
4 |
0,055 |
1818,18 |
0,018 |
5555,56 |
0.009 |
11111,11 |
|
|
5 |
0.069 |
1449,28 |
0,023 |
4347,83 |
0.012 |
8333,33 |
|
|
6 |
0.083 |
1204.82 |
0,028 |
3571,43 |
0.014 |
7142,86 |
|
|
7 |
0.097 |
1030.93 |
0,032 |
3125 |
0.016 |
6250 |
|
|
8 |
0.111 |
900.9 |
0,037 |
2702,7 |
0.018 |
5555,56 |
|
|
9 |
0.125 |
800 |
0,042 |
2380,95 |
0.021 |
4761,9 |
|
|
10 |
0.139 |
719.42 |
0,046 |
2173,91 |
0.023 |
4347,83 |
|
|
11 |
0.152 |
657.89 |
0,051 |
1960,78 |
0.025 |
4000 |
|
|
12 |
0.166 |
602.41 |
0,055 |
1818,18 |
0.028 |
3571,43 |
|
|
13 |
0,180 |
555.56 |
0,060 |
1666,67 |
0.030 |
3333,33 |
|
|
14 |
0,194 |
515.46 |
0,065 |
1538,46 |
0,032 |
3125 |
|
|
15 |
0,208 |
480.77 |
0,069 |
1449,28 |
0,035 |
2857,14 |
|
|
16 |
0,222 |
450.45 |
0,074 |
1351,35 |
0.037 |
2702,7 |
|
|
17 |
0,235 |
425.53 |
0,078 |
1282,05 |
0,039 |
2564,1 |
|
|
18 |
0,249 |
401.61 |
0,083 |
1204,82 |
0,042 |
2380,95 |
|
|
19 |
0,263 |
380.23 |
0,088 |
1136,36 |
0,044 |
2272,73 |
|
|
20 |
0,277 |
361.01 |
0,092 |
1086,96 |
0,046 |
2173,91 |
|
|
21 |
0,291 |
343.64 |
0,097 |
1030,93 |
0,048 |
2083,33 |
|
|
22 |
0,300 |
333.33 |
0,102 |
980,39 |
0,051 |
1960,78 |
|
|
23 |
0,300 |
333.33 |
0,106 |
943,4 |
0,053 |
1886,79 |
|
|
24 |
0,300 |
333.33 |
0,111 |
900,9 |
0,055 |
1818,18 |
|
|
25 |
0,300 |
333.33 |
0,115 |
869,57 |
0,058 |
1724,14 |
|
|
26 |
0,300 |
333.33 |
0,120 |
833,33 |
0,060 |
1666,67 |
|
|
27 |
0,300 |
333.33 |
0,125 |
800 |
0,062 |
1612,9 |
|
|
28 |
0,300 |
333,33 |
0,129 |
775,19 |
0,065 |
1538,46 |
|
|
29 |
0,300 |
333,33 |
0,134 |
746,27 |
0,067 |
1492,54 |
|
|
30 |
0,300 |
333,33 |
0,139 |
719,42 |
0,069 |
1449,28 |
|
|
31 |
0,300 |
333,33 |
0,143 |
699,3 |
0,072 |
1388,89 |
|
|
32 |
0,300 |
333,33 |
0,148 |
675,68 |
0,074 |
1351,35 |
|
|
33 |
0,300 |
333,33 |
0,152 |
657,89 |
0,076 |
1315,79 |
|
|
34 |
0,300 |
333,33 |
0,157 |
636,94 |
0,078 |
1282,05 |
|
|
35 |
0,300 |
333,33 |
0,162 |
617,28 |
0,081 |
1234,57 |
|
|
36 |
0,300 |
333,33 |
0,166 |
602,41 |
0,083 |
1204,82 |
|
|
37 |
0,300 |
333,33 |
0,171 |
584,8 |
0,085 |
1176,47 |
|
|
38 |
0,300 |
333,33 |
0,175 |
571,43 |
0,088 |
1136,36 |
|
|
39 |
0,300 |
333,33 |
0,180 |
555,56 |
0,090 |
1111,11 |
|
|
40 |
0,300 |
333,33 |
0,185 |
540,54 |
0,092 |
1086,96 |
|
|
41 |
0,300 |
333,33 |
0,189 |
529,1 |
0,095 |
1052,63 |
|
|
42 |
0,300 |
333,33 |
0,194 |
515,46 |
0,097 |
1030,93 |
|
|
43 |
0,300 |
333,33 |
0,199 |
502,51 |
0,099 |
1010,1 |
|
|
44 |
0,300 |
333,33 |
0,203 |
492,61 |
0,102 |
980,39 |
|
|
45 |
0,300 |
333,33 |
0,208 |
480,77 |
0,104 |
961,54 |
|
|
46 |
0,300 |
333,33 |
0,212 |
471.7 |
0,106 |
943,4 |
|
|
47 |
0,300 |
333,33 |
0,217 |
460.83 |
0,109 |
917,43 |
|
|
48 |
0,300 |
333,33 |
0,222 |
450.45 1 |
0,111 |
900,9 |
|
|
TABLE 3 DRIP DISPERSAL FIELD SIZING AND LOADING RATE CHART FOR HIGH HYDRAULIC CONDUCTIVITY SOILS |
|||||||
|
Brief SWT |
Mod SWT |
Lona SWT |
|||||
|
DEPTH TO RMF (inches) |
(g/ft2/d) |
Ft2/100 Gal./Day |
(g/ft2/d) |
FT2/100 Gal./Dav |
(g/ft2/d) |
FT2/100 Gal./Day |
|
|
1 |
0.249 |
402 |
0.042 |
2381 |
0.021 |
4762 |
|
|
2 |
0.374 |
267 |
0.063 |
1205 |
0.042 |
2381 |
|
|
3 |
0.499 |
200 |
0.125 |
800 |
0.062 |
1613 |
|
|
4 |
0.623 |
161 |
0.166 |
602 |
0.083 |
1205 |
|
|
5 |
0.748 |
134 |
0.208 |
481 |
0.104 |
962 |
|
|
6 |
0.873 |
115 |
0.249 |
402 |
0.125 |
800 |
|
|
7 |
0.997 |
100 |
0.291 |
344 |
0.145 |
690 |
|
|
8 |
1.122 |
89 |
0.332 |
301 |
0.166 |
602 |
|
|
9 |
1.247 |
80 |
0.374 |
267 |
0.187 |
535 |
|
|
10 |
1.250 |
80 |
0.416 |
240 |
0.208 |
481 |
|
|
11 |
1.250 |
80 |
0.457 |
219 |
0.229 |
437 |
|
|
12 |
1.250 |
80 |
0.499 |
200 |
0.249 |
402 |
|
|
13 |
1.250 |
80 |
0.540 |
185 |
0.270 |
370 |
|
|
14 |
1.250 |
80 |
0.582 |
172 |
0.291 |
344 |
|
|
15 |
1.250 |
80 |
0.623 |
161 |
0.312 |
321 |
|
|
16 |
1.250 |
80 |
0.665 |
150 |
0.332 |
301 |
|
|
17 |
1.250 |
80 |
0.706 |
142 |
0.353 |
283 |
|
|
18 |
1.250 |
80 |
0.748 |
134 |
0.374 |
267 |
|
|
19 |
1.250 |
80 |
0.790 |
127 |
0.395 |
253 |
|
|
20 |
1.250 |
80 |
0.831 |
120 |
0.416 |
240 |
|
|
21 |
1.250 |
80 |
0.873 |
115 |
0.436 |
229 |
|
|
22 |
1.250 |
80 |
0.914 |
109 |
0.457 |
219 |
|
|
23 |
1.250 |
80 |
0.956 |
105 |
0.478 |
209 |
|
|
24 |
1.250 |
80 |
0.997 |
100 |
0.499 |
200 |
|
|
25 |
1.250 |
80 |
1.039 |
96 |
0.519 |
193 |
|
|
26 |
1.250 |
80 |
1.081 |
93 |
0.540 |
185 |
|
|
27 |
1.250 |
80 |
1.122 |
89 |
0.561 |
178 |
|
|
28 |
1.250 |
80 |
1.164 |
86 |
0.582 |
172 |
|
|
29 |
1.250 |
80 |
1.205 |
83 |
0.603 |
166 |
|
|
30 |
1.250 |
80 |
1.247 |
80 |
0.623 |
161 |
|
|
31 |
1.250 |
80 |
1.250 |
80 |
0.644 |
155 |
|
|
32 |
1.250 |
80 |
1.250 |
80 |
0.665 |
150 |
|
|
33 |
1.250 |
80 |
1.250 |
80 |
0.686 |
146 |
|
|
34 |
1.250 |
80 |
1.250 |
80 |
0.706 |
142 |
|
|
35 |
1.250 |
80 |
1.250 |
80 |
0.727 |
138 |
|
|
36 |
1.250 |
80 |
1.250 |
80 |
0.748 |
134 |
|
|
37 |
1.250 |
80 |
1.250 |
80 |
0.769 |
130 |
|
|
38 |
1.250 |
80 |
1.250 |
80 |
0.790 |
127 |
|
|
39 |
1.250 |
80 |
1.250 |
80 |
0.810 |
123 |
|
|
40 |
1.250 |
80 |
1.250 |
80 |
0.831 |
120 |
|
|
41 |
1.250 |
80 |
1.250 |
80 |
0.852 |
117 |
|
|
42 |
1.250 |
80 |
1.250 |
80 |
0.873 |
115 |
|
|
43 |
1.250 |
80 |
1.250 |
80 |
0.894 |
112 |
|
|
44 |
1.250 |
80 |
1.250 |
80 |
0.914 |
109 |
|
|
45 |
1.250 |
80 |
1.250 |
80 |
0.935 |
107 |
|
|
46 |
1.250 |
80 |
1.250 |
80 |
0.956 |
105 |
|
|
47 |
1.250 |
80 |
1.250 |
80 |
0.977 |
102 |
|
|
48 |
1.250 |
80 |
1.250 |
80 |
0.997 |
100 |
|
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.