This rule creates a detailed catch basin model on top of a shape. The basin can be adjusted for depth, width, size of grate, spacing of grate, etc. You can cut away the side of the basin to look inside. It has realistic material textures on the outside and inside.
You can see a video of it in action here:
It is a companion to the manhole rule you can see in action here: https://youtu.be/fmEsyw9-wQI
Give CityEngine a try with this free 30-day trial: http://bit.ly/EsriCETrialLink