Lateral Design Overview
Lateral design is available in both the storm sewer and sanitary
sewer design programs. A lateral pipe is very much like a regular
pipe in sewer network. It is a pipe between a lateral connection,
inserted at the main pipe line, and a lateral cleanout that goes
into the lot. The Lateral Connection and Lateral Cleanout are
specific types of sewer structures, which can be defined in Sewer
Structure Library. The lateral connection has a property of offset
elevation relevant to the mainline sewer invert at the point of
connection. The lateral cleanout is a circular structure with the
same bottom and top diameters.
There are lateral specific parameters for the riser height, station
at riser end (measured from mainline to cleanout) and the basement
floor elevation.
For Draw Sewer Network in Plan View, Draw Sewer Profile, Report
Sewer Network and Edit Sewer Network in the spreadsheet, the main
line pipe will be shown from MH to MH. In plan view, you can label
lateral station at the lateral connections (measured for its
downstream MH). In draw sewer profile, the lateral connection
labels are separated from pipe crossing labels so that lateral
connections can have different label settings. Spreadsheet Sewer
editor is able to edit both main line pipes and lateral pipes.
The following is the procedure of creating and editing laterals
when working on a storm or sanitary sewer network.
1. Create a new lateral
Click on the Add button for new structures and choose the option
“Add Lateral from Cleanout Point”. Then pick a location to create
the cleanout structure, and snap main pipe line to insert the
lateral perpendicularly. Once the intersection point is determined
on the main line, the elevation of the downstream end of the
lateral is set to the mainline invert at the intersection, plus the
offset value defined in the connection structure.
If this is the first lateral in the network, the program checks the
Sewer Structure Library to get the first lateral cleanout and
connection structure in the list. Otherwise the last used pair will
be used. If there is no lateral cleanout or connection structure in
the library, the lateral becomes a regular pipe.
2. Edit a lateral
Editing a lateral is similar to a regular pipe. The lateral can
change to a regular pipe if the end structures are changed to
manhole structures. The lateral is perpendicular to the main pipe
line when it is created at the beginning, but it can be relocated
along the mainline by the Location button. The invert
elevation of both ends of the lateral can be modified as same as a
regular pipe.