http://tinyurl.com/y8sysjv

"only limited amounts of glyphosate move to surface water as runoff. A
three-year study of glyphosate transport from agricultural fields showed
that less than 1 percent of glyphosate applied was typically lost as
runoff. In one case, a loss of 1.85 percent of applied glyphosate was
observed for a field treated at twice the recommended application rate,
with more than 99 percent of the total runoff occurring during a severe
rainstorm that occurred the day afterapplication (Edwards et al.,
1980)."

Roundup is typically used at the low application rate of around one gallon 
per acre.

Paul Cherubini
El Dorado, CA

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