Introduction to pipe networks

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pipe-ntwrk-intro-01.mp4 10:38

What pipe networks do and don't do

Do not

• Perform hydrology or hydraulic analysis

Do

• Provide an initial layout of the storm sewer system
• Provide feedback on geometric feasibility of the system.
• Automate plans production
• Provide limited clash detection functionality.

The templates

• 2014-16 Configuration
  • The wisdot2016-14-pipe.dwt should be used for the creation of all pipe networks.
  • The wisdot2016-14.dwt should be used for all pipe network plans production via data reference.
  • The pipe network style names are the same in both templates. However, the styles in wisdot2016-14-pipe.dwt styles display the model and the wisdot2016-14.dwt styles display for plans production.
• Civil 3D 2016 and 2018
  • the wisdot##.dwt contains all the necessary parts lists and styles used in both design and production.

Creating the pipe network

In most cases, it is best to put the entire storm sewer system into a single pipe network. .

Reasons for a single network

• Easier data extraction for misc quantities tables
• Easier data transfer to hydrology/hydraulics software such as Storm and Sanitary Analysis (SSA) or Hydraflow.

There may be reasons to separate the network, perhaps so multiple designers can work on it. If so, try to separate the network where they do not connect (each side of a high point for example)

When you create a pipe network, you will be asked to specify a reference surface. This is important because structures reference the surface to obtain its rim elevation. Pipes reference the surface to determine cover.

The catch is that pipes should reference the datum surface and structures should reference the top surface. For a storm sewer pipe network it is a best practice to start by layout out all of your structures. Therefore, choose the top surface when initially creating the pipe network. Once all of the structures are in place, change the pipe network reference surface to datum and begin placing the pipes.

Understanding Rules

Rules are the basis for the pipe networks' logic during initial layout

Account for:

• Pipe slope
• Pipe cover
• Max pipe length
• Crown matching at structures
• Structure sump depth
• Max pipe size for structure

Rules make provide an initial layout for the system based on geometrics, not hydraulics

Once initial layout is complete, rules function as a "design advisor" by informing you of issues. (for example: cover is too low at a given location) The catch is that you need to check the rules.

Rules can be re-applied at any time, but beware. They may change your design. I recommend using rules for initial layout. Then, you take control of the design and use the rules for feedback on feasibility.