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→Surface Infiltration Rate Testing
|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.
|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.
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===Standard Equipment Used===
Equipment needed for surface infiltration rate testing will vary depending on the chosen test method (constant head and falling head methods) but can include the following:
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* Safety apparel (steel toed boots)
* Safety cones or barriers (for restricting access when testing permeable pavements)
* Clipboard, inspection field data forms, pens
* Testing instrument (e.g., infiltrometer or permeameter) and instruction manual
* Stopwatch
* Water reservoir (e.g., truck mounted tank or cistern filled with water)
* Buckets or jugs (for filling the instrument)
* Plastic graduated cylinder (for measuring volume of water added during constant head infiltrometer tests)
* Soil moisture probe
* Fine sand (for even contact between Tension infiltrometer and soil surface)}}
For further information regarding soil characteristics, acceptance criteria per LID BMP type and associated testing tools and protocols scroll down to the embedded 2016 guide below.
==Natural or Simulated Storm Event Testing==
==Natural or Simulated Storm Event Testing==