---
title: Duluth UDC § 1016.04 — 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/1016.04"
licence: "CC0-1.0"
---

# Duluth UDC § 1016.04

Energy Dissipation Design for Piped Systems and Culverts

**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:** 10 — Erosion Control and Stormwater Management
- **Pages in source:** 281
- **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

1. The maximum developed condition flow velocity at the project site's downstream property line adjoining
another property shall not exceed the maximum pre-developed condition’s velocity. Calculations may be
required to support this velocity standard on a case-by-case basis.
2. Energy dissipation devices, such as splash pads, rip-rap, stilling basins, etc., shall be provided at the outlet
of every culvert and piped collection system. Velocity protection shall be in accordance with the Georgia
Stormwater Management Manual. Velocities for the fully developed 25-year flow shall not exceed the
non-erosive velocity as shown in the Georgia Stormwater Management Manual for the receiving
conveyance. Details and all calculations must be submitted with the Development Plans.
3. Energy dissipation devices shall be located entirely within the project site and shall not encroach upon any
required buffer.
4. When uniform, graded stone rip-rap is used for energy dissipation, ultraviolet resistant filter fabric (200-
pound test) shall be used between the stone layers.