Mortar missing between manhole risers in Zieglerville, Pa., created large gaps through which Perkiomen Creek poured when flooded. Flows frequently exceeded the 200,000 gpd discharge limit at the sewage treatment plant."Surprisingly, we didn't have overflows or manholes backing up," says Public Works director Tom Manning. "By speeding up the treatment process, all the water went through the plant, but it was touch and go."Lower Frederick Township, the municipality governing the village, had limited success in reducing inflow and infiltration (I&I). Without substantial improvement, the 4,800 residents faced constructing a larger treatment plant, a solution they couldn't afford.While attending a state
