Indiana Administrative Code › Title 410 - INDIANA DEPARTMENT OF HEALTH › Article 6 - SANITARY ENGINEERING › Rule 10.1 - Commercial On-Site Sewage Systems › Section 10.1-65 - Construction of sewers

Current through July 10, 2024
Authority: IC
				  16-19-3-4;
				  IC
				  16-19-3-5
Affected: IC
				  16-19-3-4
Sec. 65.
(a) Sewers
				beginning three (3) feet outside the foundation walls of buildings shall be
				constructed of piping that meets the minimum requirements of section 75(a)(1)
				or 75(a)(2) of this rule.
(b)
				Sewers serving individual units may connect to the main sewer by wye fittings.
				Sewers serving more than one (1) unit must connect to the main sewer at a
				manhole.
(c) Sewers shall be laid
				to a uniform grade and at a slope equal to or greater than the minimum slopes
				shown in Table IV as follows and may not be increased in size for the sole
				purpose of reducing the required slope:
Table IV - Minimum Slope for Sewers
Sewer Size
Minimum Slope in Feet per 100 Feet*
4 inch diameter (building sewer only)
1.33
6 inch diameter
0.61
8 inch diameter
0.40
10 inch diameter
0.28
12 inch diameter
0.22
15 inch diameter
0.15
16 inch diameter
0.14
18 inch diameter
0.12
21 inch diameter
0.10
24 inch diameter
0.08
*Based on the Hazen-Williams formula using
							 C = 140.
(d)
				No outside building sewer shall be less than four (4) inches in diameter.
				Minimum sewer diameters will vary upward from four (4) inches according to use.
				Because of slope, cleaning, and maintenance problems, installation of four (4)
				inch sewers is unacceptable except where they can adequately serve a building
				or facility having very low anticipated sewage flows. Sewers shall be
				adequately sized to carry average and intermittent peak flows. Soil, waste,
				vent, and drain piping inside the building shall comply with the Indiana
				Plumbing Code (675 IAC 16).
(e)
				Adequate sewer bedding shall be provided. All sewers shall be buried with at
				least two (2) feet of cover to protect them from freezing. Force mains must be
				buried deep enough to prevent freezing unless the lift station and force main
				can be designed such that the force main will drain completely.
(f) Sewers proposed under driveways, parking
				slabs, or other heavily loaded areas, shall be adequately constructed to
				prevent damage or breaking.
(g)
				Manholes must be installed at the end of each line, at all changes in grade,
				size, or alignment, at all intersections, and at intervals not greater than
				four hundred (400) feet for sewers fifteen (15) inches diameter or less.
				Intervals not greater than five hundred (500) feet are allowed for sewers
				eighteen (18) inches or greater in diameter.
(h) A drop manhole should be installed where
				a sewer enters the manhole twenty-four (24) inches or more above the manhole
				invert. The outside drop connection constructed with a drop manhole should be
				encased in concrete.
(i) The
				minimum acceptable diameter for manholes is forty-eight (48) inches. The access
				opening into the manhole must be at least twenty-two (22) inches in
				diameter.
(j) Cleanouts may be
				substituted for manholes on short sewer runs. Cleanouts must:
(1) be the same diameter as the sewer they
				are to serve; and
(2) extend to
				grade.
A cleanout may be installed at the terminus of a sewer
				  provided that a manhole is within three hundred (300) feet of the terminus.