He said a shaft was being sunk to reach the damaged culvert, 12 metres (39ft) underground.
"It's as if it's a culvert that you stuff hundred-dollar bills into, " he says.
Experts said they were now working to access a nearby underground culvert, which ruptured during the downpour.
Neither Northumberland Estates, which owns the land where the culvert stands, or Dunelm Homes has admitted liability.
That's the plan for a culvert in Au Sable Forks that has been repeatedly ravaged by recent flooding.
The flats have now been demolished, allowing workers and machinery safe access to the open section of culvert.
Flood water disturbed ground beneath Spencer Court, Newburn, Newcastle, damaging the foundations when a culvert collapsed during flash floods.
BBC: Newburn flood flats: ?10m culvert repair stage completed
The Environment Agency will build overflow areas, raise flood defences and install a culvert along Salmons Brook in Edmonton.
Ventilation and air monitoring equipment has been installed inside the culvert for workers who will be removing the debris.
Developer Dunelm Homes owns the land on which the homes stand, while the culvert is on land owned by Northumberland Estates.
Ian Turner, the council's head of highway operations, said water levels were still "too high" at one end of the culvert.
Staffordshire Fire Service said it was pumping water from the A34 into a nearby culvert on the advice of the Environment Agency.
Workers will go inside a collapsed culvert to investigate how a block of flats was left close to collapse after flooding in Newcastle.
Mr Turner said the council had also built a 1m high dam near the culvert, which had improved water flow through the area.
Work began last week to allow access into the open section of culvert between Spencer Court and Mill Vale and has now been completed.
The project is on a tributary of the Ausable River in the Essex County town of Jay, where an undersized culvert has caused severe erosion.
The other, behind her home, has debris from earlier flooding and "could fill very quickly with water if a culvert becomes blocked", said the council.
Bridgend Council's cabinet member for communities Councillor Phil White confirmed the incident was due to a blocked culvert underneath the railway line, behind privately-owned flats.
The authority built the dam and brought in a team of divers to clear a culvert under the road at the start of the year.
Near Ranganijar, a little temple was erected to Ganesha, over the grave of a small calf that died in an irrigation culvert in a tea estate.
It is understood the culvert is underneath a railway line and Network Rail staff are working with fire crews and Bridgend council to tackle the problem.
According to Paul Balkenbush, stream fish biologist for the Oklahoma Department of Wildlife Conservation, improved culvert designs allow native smallmouth to reach necessary habitat at high flows.
One boy was swept away by rushing waters in a culvert, but he miraculously escaped with just a dislocated elbow, and no other major injuries were reported.
Staffordshire county council said the divers went into a culvert underneath the road and found blockages created by debris and a build up of silt and mud.
The council had been due to start major work on a culvert in Cilfynydd Road on Monday before the flood hit and a decision will be taken on when that can start.
Northumberland Estates said it was working hard to find a long-term solution but said there was little it could do "in the face of such very extreme weather conditions until the culvert can be cleared".
When replacement is cost-prohibitive or impractical, the culvert might be made more hospitable to fish and the streambed more resistant to flood damage by installing large boulders to create a step-like structure in the stream at the downstream end of the culvert, said Michelle Brown, an Adirondack Nature Conservancy biologist.
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