Thanks to Engineered Efficiency I am able to provide a Corrugated HDPE Part Family. The part family is based on the Hancor Drainage Handbook and includes sizes from 4" to 60". The part family can be downloaded using this link.
To get the pipes to be included in your catalog, unzip them and place the files in the following folder:
Vista: C:\ProgramData\Autodesk\C3D 2009\enu\Pipes Catalog\US Imperial Pipes\Circular Pipes
XP: C:\Documents and Settings\All Users\Application Data\Autodesk\C3D 2009\enu\Pipes Catalog\US Imperial Pipes\Circular Pipes\
The AeccSharedPropertyLists.xml file isn't part of the catalog, but lets you add HDPE as a material type.
Once copied over, go to the Pipes menu, Part Builder and click on the catalog regen button. The corrugated pipe should then be available to add to a parts list, although it may not show up after clicking the button. If it doesn't show up click the folder with check mark button and try again.
If you have any questions regarding this, just send me an email at Christopher@Civil3DReminders.com or add a comment.