They normally would require a casing, but in this case they're going to build a rail yard over the sewer after it is installed. So there could be 10 to 12 rail spurs built over the line, making it impractical to put the sewer line in a sleeve for that great a distance.
Hello everyone,
I've designed quite a bit of sewer, but it's all been pretty bland. I am looking at a new sewer main that will have 30 ft of cover, and on top of that railroad spurs. I've always used SDR 35 in the past, but could use some direction on the proper material for this application...
Hello All,
A few years back, a local civil engineer convinced the municipality here to require PC 200 for water lines instead of PC 150. The rationale was that as temperature of the pipe increased, hoop strength decreased, and in the case of PC 150, might decrease to the point of failure at...
To keep the jurisdiction happy, I need to measure flow either going into or coming out of a large septic tank. The flow is going to amount to a few to several hundred gallons per day--not much. All the meter guys say the accuracy goes to he11 at low flows. Does anyone know of an inline flow...
Hello,
I don't know if this is an appropriate question, but I'll take the chance. . .I'm working on a residential 110-lot subdivision that will require a lift station and about 1,000 feet of force main dumping into a gravity sewer system. I need help with the design. That could be anything...
Thank you for the responses. I see how we can improve how we're using the software but I'm still not sure there's a clean way to input hydrant flow tests into EPANet, so that we can use those flow tests to model a supply. Any additional pointers would be appreciated.
Thanks.
Hi,
Guys in my office use EPANet to model simple distribution system expansions (usually 8" mains, C900 plastic, pretty standard). I don't know the software very well but I'm concerned about its ability to accurately model sources. The guy that uses it just puts in the static pressure from...
The need is that the existing line is anticipated to approach capacity in the near future. The proposed solution is to divert some of the flows from the existing line through a new development to another trunk line to the treatment plant. It sounds like from your responses it may be simplest...
Hello,
I need to design a manhole to drop over an existing sewer main to divert a variable portion of the flow to a new main. These seem to be most commonly referred to as "splitter manholes." I intend to make the new invert out the same as the existing invert out but am not sure beyond that...
I guess I have two goals here. One is to demonstrate that with the proposed basins, I have enough capacity to store the 100-yr 1-hr event as determined by the rational method, as dictated by the state. I don't use hydrocad for that process, it is a pretty simple set of calculations and spits...
Hello,
I want to model a 100-year, 1-hr storm because that is the event that the jurisdiction requires that we size the basins for.
However, using SCS distributions all I get are 24-hour storms. In one place I read that "each [SCS] curve contains depth information for events of ALL durations...
Can anyone point me to a good detail for a roll curb drop inlet? The details I have all transition up to vertical for the drop inlet, which I don't want.
Thanks.
Is the question I was asked when pitching HydroCAD to my boss. Any input? I wish HydroCAD had some kind of 30 day full version evaluation--the five node, one hour limitations make it a little difficult to get a feel for it on an overall project level.
Thanks.
