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Chapter 2 Stormwater Management Appendix - Fauquier County

Chapter 2 Stormwater Management Appendix - Fauquier County

Design Standards Manual

Design Standards Manual 1 st Edition i) 1 to 2 minute intervals for rapid rates of water movement (greater than 1.5 inches per hour) ii) 5 to 10 minute intervals for moderate rates of water movement (0.5 to 1.5 inches per hour) iii) 15 to 30 minute intervals for slow rates of water movement (less than 0.5 inches per hour) c) The number of readings shall be sufficient to establish a pattern of water movement. The readings shall be recorded from the beginning of the test through completion. d) The test is considered complete when at least 4 consecutive water level drops are identical or very similar, indicating that the soil is completely saturated and the permeameter flow rates indicate only the rate of water movement through the soil. The testing period will vary with the moisture level of the soil. As soil moisture decreases, the test period increases because of the time required to saturate the soil. Minimum test periods shall be: e) Test results i) 30 minutes for soils with rapid rates of water movement (greater than 1.5 inches per hour) ii) 1 hour for soils with moderate rates of water movement (0.5 to 1.5 inches per hour) iii) 2 hours for soils with slow rates of water movement (less than 0.5 inches per hour) i) The Glover solution (Zanger, C.N. 1953. Theory and Problems of Water Percolation. U.S. Department of Interior, Bureau of Reclamation, Engineering Monograph No 8, Denver, Colorado) shall be used to calculated saturated hydraulic conductivity. ii) Saturated hydraulic conductivity calculations for the last 4 readings shall be documented for each test point. iii) The saturated hydraulic conductivity of the test area shall be determined by averaging the last saturated hydraulic conductivity calculation from each test point. 2) Percolation test The percolation test shall use the Virginia Department of Health standard percolation test procedure. Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-62

Design Standards Manual 1 st Edition 3) Double ring infiltrometer ASTM standard D-3385 shall be used as the test procedure. 4) Generally accepted Industry Standards/Methodology. Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-63

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