Dear Tech Abby,What does 46 psi pipe stiffness really mean?  Do all pipes meet or need 46 psi?  Can you help?-          John Q. CivilJ.Q., you are not alone. 

I often receive questions on how to properly design a reline project, from assessment and hydraulics to structural design.  I thought I would take time to

The Irish playwright, George Bernard Shaw, wrote “The single biggest problem in communication is the illusion that it has taken place”. Whether you are involved

Hydrologic culvert design in general terms may be considered an art more than a science in my opinion. There certainly are hard facts and science involved but

I get asked quite often a seemingly benign question related to the design and installation of corrugated metal (and plastic) pipes - a question that’s worded