LNVALower Neches Valley Authority (Beaumont, TX)
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"We were experiencing problems with the existing reinforced concrete pipe joints separating and allowing canal water to leak into the ditch," said Ryan Ard, P.E., LNVA engineering manager.
As originally planned, this project would be designed by LNVA staff and put out for public bid by a general contractor in mid to late 2017.
LNVA engineers analyzed several alternative repair designs, but ultimately decided the best option was to rebuild the crossing in its original configuration.
Because the hydraulics of both the canal and the drainage culverts had been performing satisfactorily for many years, and also because of vertical space limitations, LNVA decided to use the same size pipe for the reconstruction.
LNVA considered different types of pipe material for this application.
While the needed pipe would measure only 600 linear feet of 48-inch diameter, generally an amount falling below the dollar value required for a formal bid process, LNVA nonetheless, publicly advertised for bids to supply fiberglass reinforced pipe (FRP).
The LNVA ultimately chose Hobas centrifugally cast, fiberglass reinforced, polymer mortar (CCFRPM) pipe because, according to Ard, "We have a good service history with Hobas and it is installed in various other locations on our system.
All of these benefits facilitated the LNVA crews being able to install the pipe relatively easily with no previous experience installing this type of pipe.
Conservationists say that LNVA is pursuing the project to profit by selling the water to communities in West Texas.