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A. Site Layout
While site layout will not give a specific reduction credit, conscientious site layout will reduce the impervious area, thus reducing the post-construction BMP requirements. When the predevelopment grade is steeper than five horizontal to one vertical (5:1) or the site contains natural creeks or wetlands, the site layout shall be designed to require the least modification to the existing topography and drainage. Factors to be considered are lots oriented and designed to minimize change in grade, drainage systems designed to minimize change in time of concentration, and street layouts designed to minimize extents of pavement.
B. Potential Pollutants
Potential pollutants to be treated with post construction BMPs may consist of, but are not limited to the following:
C. BMP Selection
Examples of factors that shall be considered when evaluating and selecting BMPs area as follows:
D. Allowable Post-Construction BMPs:
The following post-construction BMPs may be used. Refer to the NCTCOG iSWM Technical Manual for Site Development Controls or other acceptable North Texas design criteria for detailed design guidance not contained in this manual.
Other post construction BMPs and innovative designs will be considered when submitted with supporting calculations and removal efficiencies in accordance with nationally or regionally recognized design criteria.
E. Easement Requirements
Refer to Section 2.2 of this manual.
F. Construction and Maintenance
The owner shall construct and maintain all post construction BMPs. Ownership and maintenance responsibility of the BMPs are transferable upon the sale of a property. For subdivisions, maintenance may be performed by an association (including home owners associations), but ownership and maintenance responsibility are transferred to each individual property within the association. The plat or separate instrument dedicating the easement shall include a statement of the owner’s responsibility for maintenance; and a Maintenance Agreement shall be filed with detailed information concerning BMP operation, maintenance responsibilities and enforcement actions to be taken if BMPs are not maintained. Standard language for Maintenance Statements and agreements can be obtained from the City.
G. Post-Construction BMP Inspection
The City will inspect the installation of Post-Construction BMPs. The Engineer must submit a letter stating that the post-construction BMPs were constructed as designed. This may be incorporated with the as-built letter for private improvements.
Per the maintenance agreement, the Owner may be required to submit an inspection form to the City on an annual basis as detailed in the maintenance agreement. The City may perform periodic inspections for the purpose of confirming the validity of the inspection reports and ensuring that the BMPs are still functioning as designed. The City may require repair or removal and replacement based on its inspection.
Arlington Texas Design Criteria Manual (Webpage)
Arlington Design Criteria Manual (PDF)