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City of Clayton, MO
Tuesday, March 23, 2021
Chapter 430. Storm Water Control Requirements
Article II. Post Construction Storm Water Control
Section 430.060. Findings of Fact
[Ord. No. 5965 §1(15-100), 3-13-2007]
A. Land development projects and associated increases in impervious cover alter the hydrologics of
local watersheds and increase storm water runoff rates and volumes, flooding, stream channel
erosion, and sediment transport and deposition. This storm water runoff contributes to increased
quantities of water -borne pollutants, and storm water runoff, soil erosion and non -point source
pollution can be controlled and minimized through the regulation of storm water runoff from
development sites.
B. The Metropolitan St. Louis Sewer District (MSD) has established a set of water quality and
quantity policies applicable to all development in the MSD service area, including the City of
Clayton, to provide reasonable guidance for the regulation of storm water runoff for the purpose of
protecting local water resources from degradation. It has been determined that the regulation of
storm water runoff discharges from land development projects and other construction activities in
order to control and minimize increases in storm water runoff rates and volumes, soil erosion,
stream channel erosion and non -point source pollution associated with storm water runoff is in the
public interest and will prevent threats to public health and safety.
Section 430.070. Purpose
[Ord. No. 5965 §1(15-101), 3-13-2007]
A. The purpose of this Article is to protect and safeguard the general health, safety and welfare of the
public residing in watersheds within the City of Clayton which is included in the MSD service area.
In general, the City of Clayton seeks to meet that purpose through the following objectives:
1. Minimize increases in storm water runoff from any development in order to reduce flooding,
siltation and erosion;
2. Minimize increases in non -point source pollution caused by storm water runoff from
development which would otherwise degrade local water quality; and
3. Reduce storm water runoff rates and volumes, soil erosion and non -point source pollution,
wherever possible, through storm water management controls and to ensure that these
management controls are properly maintained and pose no threat to public safety or adjacent
properties.
Section 430.080. Applicability
[Ord. No. 5965 §1(15-102), 3-13-2007]
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3/23/2021 City of Clayton, MO Ecode360
This Article shall be applicable to all site plan applications where a MSD permit is required and a City
permit is needed for the construction.
Section 430.090. Storm Water Design
[Ord. No. 5965 §1(15-103), 3-13-2007]
A. The City of Clayton specifies the MSD Rules and Regulations and Engineering Design
Requirements for Sanitary and Storm Water Drainage Facilities as originally adopted February
2006, or latest version, as the applicable document for the proper implementation of the
requirements of this Article. In addition, the City of Clayton's City -Wide Storm Water Study, dated
August 2006, includes details of several BMPs for addressing specific needs in the City of Clayton
such as rain gardens, bioswales, pervious concrete, pervious paver systems and storm water
planters.
B. The MSD regulations include a list of acceptable storm water treatment practices, including the
specific design criteria for each storm water practice. The manual may be updated and expanded
from time to time, at the discretion of MSD, based on improvements in engineering, science,
monitoring and local maintenance experience. Storm water treatment practices that are designed
and constructed in accordance with these design and sizing criteria will be presumed to meet the
minimum water quality performance standards.
C. Developers shall include storm water control measures on the site plan submitted for the
Department of Planning and Development review of proposed construction in addition to submittal
to MSD for appropriate permits.
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