Statutes, codes, and regulations
Indiana Administrative Code
Title 410 - INDIANA DEPARTMENT OF HEALTHArticle 6 - SANITARY ENGINEERING
Rule 410 IAC 6-8.3 - Residential On-Site Sewage Systems
Section 410 IAC 6-8.3-76 - Subsurface trench flood dosed on-site sewage systems: design and construction requirements

410 Ind. Admin. Code 6-8.3-76

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Current through October 31, 2024
Section 410 IAC 6-8.3-76 - Subsurface trench flood dosed on-site sewage systems: design and construction requirements

Authority: IC 16-19-3-4; IC 16-19-3-5

Affected: IC 16-19-3-4

Sec. 76.

(a) Subsurface trench flood dosed on-site sewage systems shall meet all of the requirements of:
(1) sections 74 and 75 of this rule; and
(2) this section.
(b) When a subsurface trench flood dosed soil absorption system is used, the dosing effluent pump shall be sized, and its controls set to deliver the DDF to the soil absorption field in each dose. Effluent pump selection shall be based on manufacturer's pump curves for the required discharge rate from Table VII, as follows, at the total head imposed on the pump:

Table VII - Required Effluent Pump Discharge Rates for Subsurface Trench Flood Dosed On-Site Sewage Systems
Number of Bedrooms Discharge Rate in Gallons per Minute
1 30-35
2 30-35
3 30-45
4 30-60
5 38-75
6 45-90

(c) The total head for a subsurface trench flood dosed soil absorption system shall be the elevation difference between the effluent pump off and the highest point in the force main or the outlet of the effluent force main in the distribution box, whichever is the highest elevation, in addition to the friction loss in the effluent force main expressed in feet.
(d) The effluent force main shall drain unless it is installed below the frost line, as listed in Table VIII, as follows, and designed so that no effluent remains in any portion of the effluent force main located above the frost line:

Table VIII - Frost Penetrations in Indiana (in inches)
Adams 60 Franklin 48 Lawrence 48 Rush 54
Allen 60 Fulton 60 Madison 60 St. Joseph 60
Bartholomew 48 Gibson 42 Marion 54 Scott 36
Benton 60 Grant 54 Marshall 60 Shelby 54
Blackford 60 Greene 54 Martin 48 Spencer 36
Boone 54 Hamilton 54 Miami 60 Starke 60
Brown 48 Hancock 54 Monroe 48 Steuben 60
Carroll 60 Harrison 36 Montgomery 60 Sullivan 54
Cass 60 Hendricks 54 Morgan 48 Switzerland 42
Clark 36 Henry 54 Newton 60 Tippecanoe 60
Clay 54 Howard 60 Noble 60 Tipton 60
Clinton 54 Huntington 60 Ohio 42 Union 48
Crawford 36 Jackson 48 Orange 42 Vanderburgh 36
Daviess 48 Jasper 60 Owen 54 Vermillion 60
Dearborn 48 Jay 60 Parke 60 Vigo 60
Decatur 48 Jefferson 42 Perry 36 Wabash 60
Dekalb 60 Jennings 48 Pike 42 Warren 60
Delaware 60 Johnson 54 Porter 60 Warrick 36
Dubois 42 Knox 48 Posey 42 Washington 36
Elkhart 60 Kosciusko 60 Pulaski 60 Wayne 54
Fayette 54 LaGrange 60 Putnam 54 Wells 60
Floyd 36 Lake 60 Randolph 54 White 60
Fountain 60 LaPorte 60 Ripley 48 Whitley 60

(e) In addition to the liquid holding capacity of a dosing tank stated in section 62(f) of this rule the following shall apply:
(1) If the effluent force main drains to the soil absorption system, or if it does not drain between doses, the dose volume shall be the DDF.
(2) If the effluent force main drains back to the dosing tank, the dose volume shall be the DDF plus the volume contained in the effluent force main.
(f) The distal end of the effluent force main in the distribution box must be fitted with an elbow turned down or a sanitary tee, or else the distribution box must be baffled.
(g) The minimum inside diameter of the effluent force main shall be one (1) inch. The maximum inside diameter of the effluent force main shall be four (4) inches.
(h) Tables IX and X, as follows, shall be used in determining friction losses in the effluent force mains and manifold when plastic pipe is used:

Table IX - Friction Losses in Plastic Pipe (per 100 feet of pipe)
Pipe Diameter, Flow (gpm), Velocity (v)2, and Friction Loss Head (Hf)1
Flow (gpm) 1 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
Q v Hf v Hf v Hf v Hf v Hf v Hf v Hf
1 0.37 0.11
2 0.74 0.38 0.43 0.10
3 1.11 0.78 0.64 0.21 0.47 0.10
4 1.49 1.31 0.86 0.35 0.63 0.16
5 1.86 1.92 1.07 0.52 0.79 0.24
6 2.23 2.70 1.29 0.71 0.95 0.33 0.57 0.10
8 2.97 4.59 1.72 1.19 1.26 0.56 0.77 0.17
10 3.71 6.90 2.15 1.78 1.58 0.83 0.96 0.25 0.67 0.11
15 5.57 14.7 3.22 3.76 2.37 1.74 1.43 0.52 1.01 0.22
20 7.43 25.2 4.29 6.42 3.16 2.96 1.91 .87 1.34 0.37 0.87 0.13
25 9.28 38.6 5.37 9.74 3.94 4.46 2.39 1.29 1.68 0.54 1.09 0.19
30 6.44 13.6 4.73 6.27 2.87 1.81 2.01 0.76 1.30 0.26
35 7.51 18.2 5.52 8.40 3.35 2.42 2.35 1.01 1.52 0.35 0.88 0.10
40 8.59 23.6 6.30 10.7 3.83 3.12 2.68 1.28 1.74 0.44 1.01 0.12
45 7.09 13.5 4.30 3.85 3.02 1.54 1.95 0.55 1.13 0.15
50 7.88 16.5 4.78 4.68 3.35 1.93 2.17 0.67 1.26 0.18
60 9.47 23.6 5.74 6.62 4.02 2.72 2.60 0.94 1.51 0.25
70 6.70 8.86 4.69 3.67 3.04 1.25 1.76 0.33
80 7.65 11.5 5.36 4.69 3.47 1.59 2.02 0.42
90 8.60 14.3 6.03 5.83 3.91 1.99 2.27 0.52
100 6.70 7.13 4.34 2.42 2.52 0.63
125 8.38 10.9 5.43 3.72 3.15 0.96
150 6.51 5.16 3.78 1.34
175 7.60 6.90 4.41 1.79
200 8.68 8.93 5.04 2.27
225 5.67 2.84
250 6.30 3.37
275 6.93 4.13
300 7.56 4.87
325 8.19 5.70
1 This figure is based on flows for PVC Schedule 40 pipe (flow coefficient: C-150). Other values for friction loss may be used if documentation from the pipe manufacturer is provided with the plan submittal. Calculations using the Hazen-Williams equation may be used if provided with the plan submittal.
2 Flow velocity must be at least 2 fps; flow velocities above 5 fps should be avoided.

Table X - Plastic Pipe Fittings: Friction Loss - Equivalent Length of Straight Pipe (ft.)*
Fitting: 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
90° elbow, standard sharp, inside radius 5.3 6.7 7.5 8.6 9.3 11.1 13.1
90° elbow, long sweep radius 2.5 3.8 4.0 5.7 6.9 7.9 12.0
45° elbow, standard 1.4 1.8 2.1 2.6 3.1 4.0 5.1
Tee Flow (run flow) 1.7 2.3 2.7 4.3 5.1 6.2 8.3
Tee Flow (branch flow) 6.0 7.0 8.0 12.0 15.0 16.0 22.0
Gate Valve 0.6 0.8 1.0 1.5 1.6 2.0 3.0
Male/Female adapter 2.0 2.8 3.5 4.5 5.5 6.5 9.0
*Assigned values. Other values for friction loss may be used if documentation from the pipe manufacturer is provided with the plan submittal.

410 IAC 6-8.3-76

Indiana State Department of Health; 410 IAC 6-8.3-76; filed Oct 19, 2012, 2:06 p.m.: 20121114-IR-410120156FRA; filed Apr 9, 2014, 9:51 a.m.: 20140507-IR-410130350FRA
Readopted filed 9/26/2018, 2:48 p.m.: 20181024-IR-410180328RFA