8.13.13 E.coli levels found to be low despite rain
By: friendv3 (friendv3) 2013.08.13
Mad River Watch volunteers collected water samples from 36
sites throughout the watershed early Monday morning. Results show no sites were in violation of
Vermont water quality standards for recreational waters. The standard measures E.coli bacteria, which is found when there is fecal contamination
present. High E.coli levels in water indicate the likelihood of high levels of
water-borne pathogens, which can sicken swimmers. The Vermont Department of Health’s current standard
for E.coli is 235 colonies per 100 ml
Mad River Watch Results from 8.12.13 (pdf)
The volume of water flowing in the river was high and
declining when the samples were collected.
A rain storm brought the water flow (as measured at the stream gage in
Moretown) a peak of 3,500 cubic feet per second (cfs) on Sunday afternoon. At
the time of sampling, the flow had declined to approximately 630 cfs, while the
median flow for this date is 45 cfs. Generally,
E.coli levels rise as rain washes
pollutants in to the river, and then fall again as the flow declines and the
water becomes clearer.
Many thanks to our hard working and dedicated volunteer
lab coordinator Cyndee Button, and also to our cadre of dedicated volunteer
sample collectors. Volunteers this week
include: Chase Fortier, Fran & Gary Plewak, Dave Gould, Mike Ware, Ann
Felderman, and Susy Deane.