Frank Burdick’s Log Number: N/A
Submitted by: resident, via email
Category (1,2,3): 1
Status: Closed
Estimated date to
address: N/A
Q. Have you considered measuring flow directly on
the curb line to determine the flows from FDDs? (the “curb line” is the small
PVC pipe that is installed to collect the FDD flow from several houses and
connect it to a storm inlet)
A. Subsequent to this comment, we contacted Martin Control
Services (MCS), the City’s flow metering contractor, to inquire about metering
these connections. The best way to meter the flow from a pipe like this is a
direct measurement with a bucket and stop watch during a rain event, because
the flow and pipe size are too small for traditional continuous metering. MCS
mobilized on the morning of October 31, 2013 during a moderate rainfall event
(approximately 1-inch of rain over 12 hours) to make a direct measurement of
the flow in a sample curb line in the Orchard Hills subdivision. The curb line
they metered collects sump pump flow from 5 houses. MCS also made a measurement
of the flow in the 10-inch pipe that was metered during the flow-metering
program. These measurements, and
subsequent analysis, show that approximately 66% of the total flow generated
(i.e. the total of the flow in the 10-inch sanitary pipe and the footing drain
flow in the curb line) is from footing drains.
Additional information on this measurement will be presented at the next
CAC.
There are no comments.