I have a project that is adding a bike lane, ditch, and sidewalk to an existing highway. We were directed by the client to maintain the existing lane and start our improvements at the edge of the lane (sawcutting inside and keeping lane line).
One of the PMs in our office is adamant that the...
I'm working on a site project with our state DOT. On the project, there is a pond supplying water to the fire suppression systems in the buildings. There is a 24" transfer line between a pump building and the fire pond. In that line there is a 24" gate valve. The DOT designer included the...
I need some help understanding the minimum 2 ft/s "self-cleaning" velocity referenced by the 10-state and many other standard documents. I've read the other posts on this subject, but my specific question was never quite answered that I could find.
"All sewers shall be designed and constructed...
The site is a maintenance yard with multiple buildings, but all the areas around the buildings are gravel (3/4" loose with some fines). The site experiences pretty bad drainage issues with many spots of localized ponding. There's not a way to grade the site to drain to one spot, so we will need...
I have an existing fueling facility (single 1,000gal tank) that was retrofitted a while back with a spill containment system that consists of a series of strip drains and catch basins to retain any spill during fueling. The issue is that the containment system has no outlet and is open to...
I'll start off by saying that I don't do much SF residential work and most of my experience is on the public side, but I'm helping someone with a new 3-lot partition. The existing parcel is on a developed street. There are streets on either end of the block with mains and hydrants and there is...
I'm being asked to design a culvert being installed at a pretty aggressive site. The channel in which the culvert will be placed is upwards of 20%. It looks like in the vicinity of the culvert, a ~17% slope in the culvert would work with the channel slope.
I'm having a hard time finding...
I'm trying to determine the pressure of a 10" main from hydrant test results. For some reason, I've always assumed those pressures were actual system pressures, but the water board is telling me the pressure in this line is actually ~170psi. Is there a way to convert these pressures to main...
Finishing up plans for a new school and looking for some guidance on how to control a muddy job site. Currently, there is another school being constructed in the same city, and it's a mud pit. I've seen straw used on sites before, but is there any concern with the removal of straw before final...
I'm trying to model the outlet control for a detention pond and wanted to use an open-grate manhole as a riser with an orifice sized for 2yr 24hr and a barrel sized for the design storm event. I'm a bit confused on how to model the water entering the riser. Would this be a weir with a length =...
Are there any restrictions with having an FDC connection located within ~ 10' of a hydrant connection on the same 12" line? I imagine there would be an impact to fire flow if the suppression system was running and they wanted to hook up to the hydrant, but I don't really do much modeling. The...
We have a very steep site and will be sending stormwater down a hill to a swale and wanted to utilize a manhole as an energy dissipator at the bottom. I've seen installations like this around the city, but have never designed something like this myself. The site does not have room to...
