---
title: "Duluth UDC Table 9-B — Duluth"
jurisdiction: duluth
governing_jurisdiction: Duluth
source_url: "https://www.duluthga.net/UDC_ADOPTED_9.8.2025_Amended_7-13-26.pdf"
effective_date: "2026-07-13"
as_of: "2026-08-13"
canonical: "https://www.gwindex.net/code/duluth/table-9-b"
licence: "CC0-1.0"
---

# Duluth UDC Table 9-B

Maximum Pipe Invert Depth

**Governing jurisdiction: Duluth.** A "Duluth, GA" mailing address is usually NOT in the City of Duluth. Unincorporated Gwinnett is 67.3% of the county's land area and is governed by a different code, a different board and a different permit portal. Resolve the governing jurisdiction before answering any zoning question.


- **Article:** 9 — Project Design and Construction Standards
- **Pages in source:** 262–263
- **Adopted:** 2025-09-08
- **Amended through:** 2026-07-13
- **Source:** https://www.duluthga.net/UDC_ADOPTED_9.8.2025_Amended_7-13-26.pdf

## Text

Table 9-B: Maximum Pipe Invert Depth (feet)

Pipe Diameter (inches)
Maximum Pipe Invert Depth (feet)

4
5
6
7
8
9
10
11
12
13
14
15
16

15
20
20
20
20
20
25
25
30
30
30
35
35
40

18
20
20
20
20
20
25
25
30
30
30
35
35
40

24
20
20
20
20
20
25
25
30
30
30
35
35
40

30
20
20
20
20
25
25
25
30
30
35
35
35
40

36
20
20
20
20
25
25
25
30
30
35
35
35
40

42
NA
20
20
20
25
25
30
30
30
35
35
40
40

48
NA
20
20
20
25
25
30
30
30
35
35
40
40

54
NA
NA
20
25
25
25
30
30
35
35
35
40
40

60
NA
NA
20
25
25
25
30
30
35
35
35
40
40

66
NA
NA
NA
25
25
30
30
30
35
35
40
40
40

72
NA
NA
NA
25
25
30
30
30
35
35
40
40
40

3. Permanent sanitary sewer easements shall be no less than 20 feet in width when no other parallel utilities
are located therein. When warranted, temporary construction easement widths shall be determined by
the Gwinnett County Department of Water Resources
4. A common easement for sanitary sewer and drainage purposes may be allowed if the pipes are parallel
and at least 10 feet are provided between pipes (on center). The easement width shall be equal to the
width shown in Table 9-B plus the width distance separating the pipes (minimum of 10 feet).

261 | P a g e

Article Nine. Project Design and Construction Standards

5. All drainage, sewer, access or other easements which were required to be cleared shall be fine graded and
grassed within 10 days of completing construction work. The use of sediment control measures may be
required to protect the area until a comprehensive vegetative cover is obtained.

915.05. Right-of-Way Protection
1. Rights-of-way Occupancy Registration.
a. Each utility who occupies, uses or has facilities in the rights-of-way at the time of passage of the