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Sorry I was away on vacation. The chamber is expected to be completely pressurized a majority of the time due to high flows. About a mile or two upstream is a pump station. The chamber should be designed for both gravity and pressure flows.

Hey Bmir, Thanks for the feedback. Here I'll give more info and see if you can provide more feedback: Inlet flows are as follows: Angled pipe = 4,800 gallons/min or 300 l/s Straight pipe = 37,000 gallons/min or 2,300 l/s Combined outlet flow is just the sum of the above, but not knowing how...

Hello Gbam, I should have clarified that the dimensions I'm inquiring about are related to hydraulics. You mentioned that you layout similar structures for storm drain junctions... so what are the guidelines and/or rules of thumb that I should follow? I know it should depend on flows too. I...

Hello, I need advice on a sanitary sewer junction chamber that is at its preliminary design stage. I'm looking for guidelines regarding dimensions. Please see attached PDF drawing with redline markups showing my questions. Feel free to comment on the drawing in general too...

Only reasons I would want air to go back in is to prevent a vacuum collapse and to allow for drainage of a section of main. Your TWL at both ends are lower then the first hump so I think there would be a vacuum there when the pump shuts off. If you don't want air entrained, then just make sure...

Cool man. I'm only familiar with AWWA M51. I learned something haha. Guess the only consideration left is a vacuum.

bimr said you don't need the 2nd air release... but I'm not sure. If a vacuum develops in there, you might want a combo valve. This is especially true if you haven't designed your pipeline against a vacuum. Maybe bimr can expand further on the 10 ft/sec being sufficient to push air out so you...

Considerations... Some people already noted: 1. Compaction - make sure a jumping jack or equivalent gets in there. Min. 2 feet I'd say wall to wall. 2. Repair/maintenance - need to be a able to strap a saddle around the leaky spot or replace some piping. 3 feet wall to wall should be...

LittleInch is right. For a coated steel pipeline, you want to make sure that the bedding material does not damage the coating. I work for a regional water utility and most of our pipelines now are coated with Lifelast Durashield 310... back then it would be coal-tar enamel. And so... our...

Flanged coupling adaptors do not provide longitudinal restraint. Well, unless you guys are talking about restrained flanged coupling adaptors. In this case, you would have been using RFCA rather than FCA in the discussion... I don't use RFCAs because it bites onto the pipe and damages the...

I see $739,022.11 based on "Work" Group Resources and $6,516,900 based on the "Material" Group Resources. The fixed cost I get by manually summing up is $1,331,000. The total cost from adding up the 3 above is $8,586,922.11. The total cost the Gantt View shows is $8,590,557.99, which is...

Help! I have attached my file. Can someone tell me why the total resources cost + total fixed costs do not equal to the total cost calculated (i.e. the total cost shown on the Gantt view)? There is always a difference of $3,635.88, but I can't tell where this could be coming from. I tried...

Hi guys, AWWA C504 provides 2 options for butterfly valve laying lengths: short body and long body. Can anyone tell me what the plus and and minus's are and when to apply one or the other? Thanks.

Depends what pipe material you are looking at... AWWA M11 is good for steel pipelines. The DIPRA website has many ductile iron design guides.

Thanks guys. JedClampett is right that a 36 inch pipe could span typically 20 ft, 40 ft, or 60ft, at least in my area anyway. I just found out that we are using an FPI series 394 McCrometer that is inserted vertically through the top of pipe. This means I can backfill with pipe bedding to...

Thanks for the info JedClampett. I meant leaktight as in from infiltration from stormwater. The comment about using a slotted manhole section and mortaring the gaps for seal is an approach that I am considering except I was thinking of pouring cast-in-place concrete in prepared formwork (which...

Hi all, I'm a waterworks guy with limited field experience. I have a small project that involves the installation of a flow meter on an existing 36" (900mm) steel water main. To reduce costs, I am looking at using a 3050mm diameter reinforced concrete manhole (we typically go with chambers...