Construction and Post-Construction
Construction Site Stormwater Runoff Control Resources
Construction sites have the potential to cause significant impacts to downstream receiving waters as well as storm drain infrastructure if not properly managed. TPDES Municipal Separate Storm Sewer System (MS4) Permits require MS4 cities and counties to regulate private construction activities within their jurisdictions. In addition, all local governments in Texas must obtain coverage under the TPDES Construction General Permit for any municipal construction activities that disturb one or more acres.
integrated Stormwater Management (iSWM™) Program for Construction and Development.
The iSWM Program for Construction and Development is a cooperative initiative that assists cities and counties to achieve their goals of water quality protection, streambank protection, and flood mitigation, while also helping communities meet their construction and post-construction obligations under state stormwater permits.
The iSWM Criteria Manual for Site Development and Construction contains criteria that cities and counties may adopt as a component of their stormwater management related development regulations. The iSWM Technical Manual provides the technical details to meet the requirements established by each community in their locally adopted iSWM Criteria Manual.
Construction Stormwater Awareness DVD
This 14 minute DVD video equips non-stormwater municipal employees with the knowledge and resources necessary to recognize and report poor stormwater management at construction sites. This video explains the potential environmental problems caused by poor construction site management to non-stormwater staff, how to spot them, and how to report them. More Info
Post-construction Stormwater Management in New Development and Redevelopment Resources
The best way to mitigate stormwater impacts from new development is to use practices to treat, store, and infiltrate runoff onsite before it can affect the quality of water bodies downstream. Operation of a regulated small municipal separate storm sewer system (MS4), requires the development and submittal to the Texas Commission on Environmental Quality (TCEQ) of a stormwater management program (SWMP) that includes minimum control measures for post-construction stormwater management in new development and redevelopment. The minimum control measures must identify and apply best management practices (BMPs)and efforts to address post-construction runoff from new development and redevelopments that disturb one or more acres including developing:
- strategies to implement a combination of structural and non-structural BMPs,
- an ordinance to address post-construction runoff, and
- a program to ensure adequate long-term operation and maintenance of BMPs.
The North Central Texas Council of Government’s (NCTCOG) Regional Stormwater Management Coordinating Council has prepared and adopted an Ordinance Template for Post-construction Stormwater Management. This document is intended to be used as a template for local governments to consider when adopting new or revised provisions of local law to implement and enforce a post-construction stormwater program, as well as assisting in the fulfillment of the requirements set forth in the Texas Commission on Environmental Quality (TCEQ) Phase II MS4 General Permit (TXR040000) Minimum Control Measure (MCM) 4: Post-construction Stormwater Management in New Development and Redevelopment.
Ordinance Template for Post-construction Stormwater Management (Released September 2018)
- NCTCOG Stormwater BMP Library Post-construction Management Resources (Samples of Operations and Maintenance Ordinance Language, Agreements, Plans, and Inspection Forms)
- Mansfield Post Construction Water Quality Requirements (This presentation was prepared to provide a general overview of the City of Mansfield’s water quality requirements up to 2019. There is some background on regulations, who the requirements are applied to, what types of devices are common, how the requirements have been implemented, examples of devices installed to date, and the tracking system developed to help keep an inventory and track status of the devices).