texan12 said:
schmellba99 said:
Aggie_3 said:
Bottom line GBRA has spent 25 million total on as they say repair and maintenance on all the dams total over the last 55 years according to what they've been saying. That is gross mismanagement
You do realize that $25MM over a 55 year period on submerged structures isn't all that much, right?
And that there are literally hundreds of factors that go into determining what repairs are necessary, when they are necessary, etc. And that often times you can make an inspection on a structure one day and it is is really great shape, but a month later after a major event things can change significantly.
Can you explain those inspections further? The video of an engineer's perspective at https://gvlakes.com/ shows one of the exposed hinges with metal loss which led to the collapse. A simple visual inspection would have caught this.
There is nothing simple about an underwater visual inspection, especially in an environment with very limited visibility like this portion of the Guadalupe. You are talking about visibility of less than 1 foot in most applications.
Even less simple to do any repair work, especially on a design like this one that was not really made with future maintenance in mind (typical of older designs).
That very report you linked to stated that it took over 2 weeks for divers to do a destructive removal of the existing hinge assembly on Gate 1. My experience is that underwater contracting is expensive, time consuming and usually not something you do on any regular basis because of the headaches associated with such work (not to mention the cost).
Looks like those drawings were done in the 30's. Hard to read the date, but looks like
1931.
That is 89 years. Which explains the condition of the hinge when they brought it to the surface, as well as the materials of construction.
Questions I would ask are:
1. What is the design life of that gate?
2. What is the established inspection frequency?
3. What is the established inspection protocol?
4. Have other inspections been made? If so, what were the recommendations or results?
One also must keep in mind that numbers 2 and 3 above likely don't have an answer - because at the time this was constructed and for most of the life of GBRA, I doubt seriously there was any mandate for any type of PM or inspection protocol. Most of the time these things aren't required until something like this happens, then everybody goes nuts and demands procedures to be developed for everything under the sun. Now, one could make an argument that dam inspection should have been on the list of things that needed a procedure and frequency established, but simply because something should have been on the list doesn't mean that it was. Or that the state had the money to get to those dams at that point in time.