The Philadelphia Water Department (PWD) employed divers and a remotely operated
underwater vehicle to inspect, diagnose, and repair the polyethylene liner of a 150-
million gallon water storage basin without draining the basin or removing it from service.
Inspection of the basin was triggered when residual chlorine values in the basin effluent
samples were unexplainably lower than normal. Using a camera mounted on a remotely
operated underwater vehicle inserted through a hatch in the floating cover, it was
determined that the polyethylene liner was torn in three critical locations. At the influent
end of the reservoir, water was seeping under the bottom liner due to a large tear. At
the two effluent locations, water underneath the liner was being drawn into the effluent
piping through two additional tears. Divers made repairs quickly with the reservoir still in
service to safely and effectively meet system water demands. Includes figures, appendix.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 750 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 9 |
| Published : | 09/01/2006 |
