Flow Isolation

EST performs flow Isolation in sewer lines where groundwater has been determined to enter the sanitary sewer in significant quantities. Isolation of groundwater is performed during the early morning hours (Midnight to 6:00 a.m.), when residential usage is at a minimum. Portable pipe weirs are placed in the targeted sewer lines to measure the flow in segments of approximately 300 linear feet. The flow volume is calculated in order to isolate the areas contributing significant infiltration.

 

Common Flow Isolation FAQs

Why is flow isolation only completed at night?

Flow Isolation is performed during early morning hours (midnight to 6am) when residential usage is at a minimum.

How will the flow be measured?

Portable pipe weirs will be placed in targeted sewer lines to measure the flow. The flow volume will be calculated in order to isolate the areas contributing significant infiltration.  If line segments with too much flow need to be plugged, a pipe plug is inserted and a measurement is taken downstream.

How are measurements taken in large diameter pipes?

A depth and velocity reading will be used to calculate flow.

New England Office

51 Fremont Street Needham, MA 02494

Mid-Atlantic Office

127-G Gaither Drive Mount Laurel, NJ 08054