PDF- CALCULATION SHEET, Pit and Pipe -Site sewer construction guide - United Utilities - Calculation of Invert Levels

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Calculation of Invert Levels

© Copyright FENC

Table of Contents Calculation of Invert Levels

Calculation of Invert Levels © Copyright FENC

Calculation of Invert Levels Before any pipes are laid,

it is necessary to know the invert level of the drain or sewer to which the connection is to be made and to relate this to the ground level at which pipelaying is to begin

The invert level is arrived at by one of three methods

The local authority may be able to provide the information

By calculation

By excavating vertically down to expose the drain or sewer

If the local authority is unable to provide the necessary information and it would not be convenient to excavate – then you must establish the invert level by calculation

Example If you need to make a connection to the main sewer,

then you will need to carry out the following procedure

Remove the inspection chamber cover on either side of the proposed connection,

take a reading of the invert level in each inspection chamber and note the difference in levels

Measure the distance between the inspection chambers and make a note of the distance to each inspection chamber from the proposed connection

Calculate the invert level of the sewer at the point where you are to make your connection

Calculation of Invert Levels © Copyright FENC

Calculation of Invert Levels © Copyright FENC

The drawings above show details of the existing sewer and the proposed drain connection – if the distance between the inspection chambers A and B is 30 metres and the difference in invert levels at these chambers is 1 metre – then it follows that the existing sewer is laid to a fall of 1 : 30

You now need to calculate the fall from inspection chamber (B) to our new connection

Calculation of Invert Levels © Copyright FENC

Thus the fall from chamber (B) to the proposed connection is 0

6 metres

Calculation of Invert Levels © Copyright FENC

Since the staff reading at chamber (B) = 1

6 metres,

the depth to invert of the sewer at the proposed connection is:

2 metres

WHICH IS DEPTH AT (B) + FALL

Longitudinal Section of New Connection

Calculation of Invert Levels © Copyright FENC

the ground level staff reading at the proposed connection is 0

2 – 0

Having found this,

it is necessary to relate the measurement to the invert level of the new chamber at the dwelling,

to find out if the fall of the new drain is satisfactory

Assume that the invert level of the new chamber is 0

Set up the engineer's level and take readings at (Y) and (X),

Since the invert level at (X) is 0

the fall from invert level at (X) to invert level at (Y) is:

5 metres

which is satisfactory for a 100 mm drain

NOTE: 0

Calculation of Invert Levels © Copyright FENC

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