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==Safety correction==
−The measured or calculated infiltration rate must be divided by a value 2 or 3 before use in design<ref>Design criteria for infiltration. (2018, February 14). Minnesota Stormwater Manual, . Retrieved 00:16, March 14, 2018 from https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_infiltration&oldid=35583.</ref>
−{| class="wikitable"
−|+ Selecting a safety factor
−|-
−! 2
−! 3
−|-
−|Catchment < 100 m²
−|Catchment > 100 m²<ref>Ballard, B. W., Wilson, S., Udale-Clarke, H., Illman, S., Scott, T., Ashley, R., & Kellagher, R. (2015). The SuDS Manual. London.</ref>
−|-
−|Permeameter or percolation test on site
−|Double ring infiltrometer test on site, or grain size analysis used <ref>San Francisco Public Utilities Commission. (2017). Determination of Design Infiltration Rates for the Sizing of Infiltration‐based Green Infrastructure Facilities. Retrieved from http://sfwater.org/modules/showdocument.aspx?documentid=9681</ref>
−|-
−|Loamy or sandy soil
−|Clayey soil<ref>CRC for Water Sensitive Cities. (2015). Adoption Guidelines for Stormwater Biofiltration Systems: Appendix C - Guidelines for filter media in stormwater biofiltration systems.</ref>
−|}
*Single ring infiltrometer
*Single ring infiltrometer
*Soil textural classification
*Soil textural classification
+|}
+==Safety correction==
+The measured or calculated infiltration rate must be divided by a value 2 or 3 before use in design<ref>Design criteria for infiltration. (2018, February 14). Minnesota Stormwater Manual, . Retrieved 00:16, March 14, 2018 from https://stormwater.pca.state.mn.us/index.php?title=Design_criteria_for_infiltration&oldid=35583.</ref>
+{| class="wikitable"
+|+ Selecting a safety factor
+|-
+! 2
+! 3
+|-
+|Catchment < 100 m²
+|Catchment > 100 m²<ref>Ballard, B. W., Wilson, S., Udale-Clarke, H., Illman, S., Scott, T., Ashley, R., & Kellagher, R. (2015). The SuDS Manual. London.</ref>
+|-
+|Permeameter or percolation test on site
+|Double ring infiltrometer test on site, or grain size analysis used <ref>San Francisco Public Utilities Commission. (2017). Determination of Design Infiltration Rates for the Sizing of Infiltration‐based Green Infrastructure Facilities. Retrieved from http://sfwater.org/modules/showdocument.aspx?documentid=9681</ref>
+|-
+|Loamy or sandy soil
+|Clayey soil<ref>CRC for Water Sensitive Cities. (2015). Adoption Guidelines for Stormwater Biofiltration Systems: Appendix C - Guidelines for filter media in stormwater biofiltration systems.</ref>
|}
|}
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*Existing data from borehole, well and geophysical testing; and
*Existing data from borehole, well and geophysical testing; and
*Proposed location of development features (buildings, roads, utilities, etc.).
*Proposed location of development features (buildings, roads, utilities, etc.).
+===Sampling===
+
+*The recommendations above are guidelines. Additional tests should be conducted if local conditions indicate significant variability in soil types, geology, water table levels, depth and type of bedrock, topography, etc.
+*Similarly, uniform site conditions may indicate that fewer test pits are required. Excessive testing and disturbance of the site prior to construction is not recommended. <ref>Christopher B. Burke Engineering LLC. (2009). Soil Infiltration Testing Protocol SOIL INFILTRATION TESTING PROTOCOL Purpose of this Protocol Who Should Conduct Testing. Retrieved from https://www.in.gov/ocra/files/Appendix F - Soil Infiltration Testing Protocol.pdf</re>
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