Drill in Sewer Connections
When a new connection is required into a NYC sewer and no connection is available, the most usual connection required is a drill in. This is performed using a core drill machine. It is not permitted to chop into a NYC sewer using hand or power tools.
A hole is carefully cored through the NYC sewer a specific size larger than the pipe size to be connected. In most cases the city sewer must be prepared before the core drill is done by encasing the public sewer in concrete. In other cases a concrete cradle must be installed under the public sewer. The concrete reinforces and strengthens the city sewer from the added stress of the core drilling and the future house connection
Riser Connection
A riser connection is a vertical connection built on the top of a city sewer for use as a connection for a house sewer. Depending on the size and type of the public sewer different designs are used in the construction of a riser. When a sewer riser connection must be built it is a multi-step and fairly costly process.
When is a riser connection required?
It is usual for a riser connection to be required when the depth of the public sewer is greater then 13′. A riser connection can also be required if a groundwater or a rock condition exists. In these cases it is meant to alleviate the cost to property owners of having to excavate to great depths, or through groundwater and rock, in order to connect properly to the main sewer line. If a future sewer repair is needed, a riser also lowers the cost at that time as well. A riser is also required when the difference in elevation from the point where the house drain exits the building to the city sewer is greater than the pitch that is allowed to be used. As sewers work on the principal of gravity, pitching the pipe is used so the waste-water runs off properly.
Only a maximum of 1′ of pitch is permitted for every 4′ of run of pipe. Therefore a riser must be built sometimes when the difference in elevation is too great to use allowable pitch. Risers must always be one size greater than the size of the connection size from the building. In NYC where the minimum size of a sewer connection is 6″ the size of a typical riser is 8″.
Who inspects house sewer riser connections in NYC?
When a riser must be built, they are carefully inspected by DEP field personnel. A new riser must conform to accepted DEP design standards. All risers must be encased with an approved ready-mix concrete, and also reinforced with re-bar, to provide a long-lasting connection. Interestingly, after the installation is signed off by the DEP the future maintenance and ownership of it reverts back to the NYC DEP.
All riser installations are built with a clean-out on the top. This provides a way to clean out any possible future stoppages. If a riser has to be built it will add at least a few thousand dollars to the cost of an installation. Other than having to build a new manhole it is the most expensive connection to build.
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