Catch basin-freeboard-concept
Catch basin-freeboard-concept
(OP)
I recently read the following: "check the quantity of freeboard below the [catch]basin hood." In this context, is "freeboard" to be understood as the available holding capacity (of a particular catch basin) before the water it collects reaches the level of the overflow line?





RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
it sounds as if whoever wrote the rfp didn't fully understand the definition of freeboard...
RE: Catch basin-freeboard-concept
Or, it may well be that the definition is "expanded" to mean volume. That is, once the vertical distance--freeboard--is measured or determined (the rpf deals with existing CBs), a volume can be calculated (the holding capacity before it reaches the flowing) for each CB.The sum of those volumes of all CBs evaluated will give you a total holding capacity of water collected before the water collected is conveyed. In a sense, freeboard although a length, it implies a volume; because that lenght may associated with 2 other dimensions of a 3D-structure (CB may be squared, rectangular or circular; freeboard in a channel, the "volume" would be width X length, and so on...)
Thank you so much for your input.
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
cntw1953--you are correct, in open channel flow that is the freeboard.
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
Please take a look at the attached file.
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
This has been a good exercise and I thank you for it,
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
If you get into a serious backwater condition where head has to be generated in the catch basin for more water to flow through the downstream pipe, the "freeboard" will not only be much less at any particular catch basin, but also lowered at any catch basin upstream due to the increased tailwater head at the downstream catch basin.
H*(). Now I'm confused!
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Catch basin-freeboard-concept
Now, please take a look at the attached sketch as it does represent well the catch basins in consideration, and then let me know what you think.
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Catch basin-freeboard-concept
RE: Catch basin-freeboard-concept
You are stating a definition of "freeboard." That, can be found easily. The "understanding" of freeboard is what has been discussed here in the context that was used (see above),in the language quoted from an RFP. Also see the attached image.
What is your understanding?
On a separate note, I do hope that everyone is employed. These are difficult times for many, not just for engineers, and my understanding of this venues is that these are "intelligent work forums for enginering professionals." With that in mind, you now have, again, the opportunity to help others with your knowledge and expertise.
RE: Catch basin-freeboard-concept