View source for Crown (pipe)

*The elevation of the top of a pipe inner wall.

[[File:Crown-level.jpg|frame|left]]
[[File:Crown_Pipe.jpeg|left|500px]]

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== References ==
# ASTM International F 2021-06 Standard Guide for Design and Installation of Plastic Siphonic Roof Drainage Systems
# https://communities.bentley.com/products/hydraulics___hydrology/f/5925/t/120604
# http://www.drainageconsultantsltd.co.uk/about-drains/drainage-gradients-falls/