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Key components of LID BMPs that should be the subject of surface infiltration rate testing are described in the table below along with recommended test methods.
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''T<sub>2</sub>'' = Post-storm date and time (mm/dd/yyyy hh:mm:ss) when surface ponding is fully drained<br>
''T<sub>2</sub>'' = Post-storm date and time (mm/dd/yyyy hh:mm:ss) when surface ponding is fully drained<br>
==BMP Components and Test Methods==
===BMP Components and Test Methods===
Key components of LID BMPs that should be the subject of surface infiltration rate testing are described in the table below along with recommended test methods.
Key components of LID BMPs that should be the subject of surface infiltration rate testing are described in the table below along with recommended test methods.
==BMP Components and Test Methods==
{| class="wikitable" style="width: 900px;"
|+'''Key components for surface infiltration rate testing by BMP type and test methods'''
|-
!<br>'''LID BMP Type'''
!<br>'''Key Components'''
!<br>'''Recommended Test Method'''
|-
|rowspan="2"|'''[[Bioretention]] / [[Bioswales]] / [[Dry swale]] / [[Enhanced grass swales]] / [[Vegetated filter strips]]'''
|-
|[[Filter media|Filter bed surface]]
|Use an infiltrometer or permeameter to measure field saturated hydraulic conductivity (K<sub>S</sub>) in at least 5 locations or at a rate of one measurement for every 25 m<sup>2</sup> of filter bed surface area, including inlet and lowest elevation areas. Compare mean and individual values to the design specification or trigger value (See Triggers for follow-up and corrective actions below) to determine if follow-up tasks are needed.
|-
|rowspan="2"|'''[[Permeable pavement]]'''
|-
|[[Permeable pavement: Plan review|Pavement surface]]
|Use a single-ring infiltrometer to measure field saturated hydraulic conductivity (K<sub>S</sub>) in at least 5 locations or at a rate of one measurement for every 250 m<sup>2</sup> of pavement surface area, evenly distributed. For permeable interlocking pavers, follow the procedure provided by ASTM C1781_C1781M – 15 (ASTM International, 2015<ref>ASTM International. 2015. ASTM C1781/C1781M-15 - Standard Test Method For Surface Infiltration Rate Of Permeable Unit Pavement Systems. Accessed May 5 2022: https://webstore.ansi.org/Standards/ASTM/astmc1781c1781m15</ref>). For pervious concrete or porous asphalt, follow the procedure provided by ASTM C1701_C1701M – 09 (ASTM International, 2009<ref>ASTM International. 2009. ASTM C1701/C1701M-09 - Standard Test Method for Infiltration Rate of In Place Pervious Concrete. Accessed May 5 2022: https://www.astm.org/c1701_c1701m-09.html</ref>). Compare mean and individual values to the design specification or trigger value (See Triggers for follow-up and corrective actions below) to determine if follow-up tasks are needed.
|}
==Natural or Simulated Storm Event Testing==
==Natural or Simulated Storm Event Testing==