Drainage Design & Integrated Stormwater Management (iSWM)

As part of Mansfield's compliance with the Texas Commission of Environmental Quality (TCEQ) small MS4 Stormwater Permit, the City has adopted the North Central Texas Council of Governments integrated Stormwater Management (iSWM) Design Manual (PDF) for Site Development dated January 2006. In order for this manual to be properly used, it is necessary to reference the City's Local Criteria Section (PDF). When combined, the two manuals are titled the City of Mansfield Storm Water Management Manual.

Post Construction Site Control

The City of Mansfield has adopted the iSWM Water Quality Measures for post construction site control.

On July 1, 2014 post construction water quality requirements became effective. Plats and detailed development site plans submitted prior to July 1 are exempt from the post construction water requirements.

All developers and design engineers are encouraged to review the Storm Water Management Manual prior to beginning design of any drainage systems.


For questions about the City of Mansfield Local Criteria Section or City policy regarding storm drainage design please contact the City Engineer, Raymond Coffman.

Design & Implementation of Erosion & Sedimentation Control Measures

In addition to the Storm Water Management Manual, the City encourages the use of the NCTCOG iSWM Design Manual for Construction for the design and implementation of all erosion and sedimentation control measures for construction activity. To download a copy of this manual, visit the NCTCOG website.