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stream bed ecology.
VDOT makes use of “rainfall intensity and duration” charts to help size drainage systems. Each county has such a chart. Those for Culpeper and Rappahannock County are virtually identical. Data from a county’s “rainfall intensity and duration” chart, plus other factors, are used in a fortnula that produces an answer on the size of the drainage system needed for the type of road under study, be it an Interstate, primary, secondary, or residential road. Tons of water to be collected and dispersed might be one way to grasp what this all means.
Take the two miles of primary road from Clevenger’s Corner down Route 229 to Route 621, a stretch where a developer(s) is expected to add two new lanes if traffic warrants it. The new roadway will amount to six acres of asphalt. Using the Culpeper County “rainfall intensity and duration” chart, plus Other factors, runoff might total 928 tons of water during a heavy downpour. This 928 tons of moving water has to be collected and
97.2%