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| The design infiltration rate (''f''') is used in all sizing calculations for [[bioretention]] and [[bioswales]], [[dry ponds]], [[infiltration trenches]] and [[infiltration chambers|chambers]], and [[exfiltration trenches]]. It is related to, but not synonymous with 'permeability', 'field hydraulic conductivity' (''K<sub>fc</sub>''), or 'saturated hydraulic conductivity' (''K<sub>sat</sub>''). Before application a safety correction factor (''SCF'') is incorporated into the figure, depending upon the source of the raw data, and the risk of failure of the finished practice. | | The design infiltration rate (''f''') is used in all sizing calculations for [[bioretention]] and [[bioswales]], [[dry ponds]], [[infiltration trenches]] and [[infiltration chambers|chambers]], and [[exfiltration trenches]]. It is related to, but not synonymous with 'permeability', 'field hydraulic conductivity' (''K<sub>fc</sub>''), or 'saturated hydraulic conductivity' (''K<sub>sat</sub>''). Before application a safety correction factor (''SCF'') is incorporated into the figure, depending upon the source of the raw data, and the risk of failure of the finished practice. |
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| {{textbox|It is highly recommended that data are collected on site.}} | | {{textbox|It is highly recommended that testing be conducted on site.}} |
| ==Sources of data==
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| {| class="wikitable"
| | ==Planning for testing== |
| |+ Caption: Acceptable sources of data
| | ===Background Evaluation=== |
| |-
| | Prior to performing testing and developing a detailed site plan, existing site conditions should be inventoried and mapped including, but not limited to: |
| ! Procedure
| | |
| ! Suitability
| | *Surficial geology and underlying stratigraphy; |
| |-
| | *Watercourses (perennial and intermittent), water bodies, wetlands and floodplains; |
| | Guelph Permeameter
| | *Small headwater drainage features; |
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| | *Topography, slope, and drainage patterns; |
| |-
| | *Existing land cover and land use; |
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| | *Natural heritage conservation areas; and |
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| | *Other man-made features or conditions that may impact design such as existing nearby structures (buildings, infrastructure, etc.). |
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| | A sketch plan or preliminary layout plan for the proposed development should be evaluated, including: |
| | |
| | *The preliminary grading plan and areas of cut and fill; |
| | *The location and water surface elevation of all existing, and location of proposed water supply sources and wells; |
| | *The location of all existing and proposed on-site wastewater (septic) systems; |
| | *The location of other features of note such as utility rights-of-way, water and sewer lines, etc.; |
| | *Existing data from borehole, well and geophysical testing; and |
| | *Proposed location of development features (buildings, roads, utilities, etc.). |