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Again, cvg, that is extremely useful info. Thank you. I am trying to get hold of the aggregate supplier now to find a suitable mix, and your recommendation on staying away from the larger size aggregate in the smaller/thinner trench will definitely be pursued. Thanks!

Great, cvg. That helps. Thank you very much.

Note that it is the Granular A that has such a large percentage passing the 200 sieve, and not the "flexible base" option available here. So I am leaning on thinking that the flexible base option is acceptable for below the flume. If really needed, I could also specify to have 100% pass the...

Thank you, cvg. I am going to check with the base supplier tomorrow and see what other options they have available.

Thank you again. I have a call in to the local coarse aggregate supplier to see if they have any standard mix close to what you showed for the Granular 'A' (Gravel), but they are not in today due to the weather here being particularly and unusually icy. I compared the Granular A specs with what...

Awesome. Thanks. With road base I am of course familiar. I think we call it "flexible base" here.

Dik, I am not sure what size "A" base is, and I searched online and nothing came up. From what grading/rating system does such base sizing come? Thanks.

Yes, thanks, Dik, I realize the longevity may not be there, but, given my hesitancy about the potential for the presence of a waterstop taking up more room to potentially cause cracking in the thin walls, such "shortevity" may just be something that the owner has to deal with periodically by...

That helps. Thanks, guys.

Thank you very much for those specs. I may indeed go that direction, but I have also been considering using, in the cross section taken through the expansion joint location, a 3/4" silicone joint sealant along the inside of the flume, with 3/4" backer rod in back of the silicone, and then...

Thanks, Dik. Can you give some kind of reference where I can find out more information (and what exactly to spec) for bentonite? I did a look online, and all I found so far were references to powdered bentonite being contained in some kind of paper wrapping, or similar. Are there actually...

Hi, I have a follow-up question about a flume I am designing to carry stormwater outside. It is to be of reinforced concrete in a U-shape, with #3 bars in a single mat through the U-shape, with the bars both horizontally and vertically. The depth is to be only about 1.42 ft (1 ft 5 inches)...

Oh yeh, the grating is to be fiberglass, and the particular manufacturer located also supplies 1" vertical x 1" horizontal fiberglass angle supports ("embedment angles"), on which the grating is to rest. http://fibergrate.com/products/molded-gratings/micro-mesh%C2%AE-grating/ shows the...

Thank you very much for your thoughts. I am reevaluating some of the inclusions. The whole wall is only 1.5 feet tall, which includes the floor, so two mats of steel in the wall seems to just be way more than is needed. But I acknowledge your thoughts about having some steel support on either...

Thanks, BA. Yes, I wish I COULD thicken the walls, to what was originally intended. Unfortunately, because of existing conditions, and an existing underground electric line (from which a minimum clearance of 1 foot is needed, per NEC), and a nearby property line, and an expressed desire on the...

Hi, I am designing a flume to carry stormwater, a cross section depiction of which is attached. We want to have an expansion joint every 20 feet to aid in removing the construction if there is ever a problem with one of the utility lines that is to be buried underneath the flume. I do not want...

Hi, I am designing a flume to carry stormwater, a cross section depiction of which is attached. We want to have an expansion joint every 20 feet to aid in removing the construction if there is ever a problem with one of the utility lines that is to be buried underneath the flume. I do not want...