Hello,
I just got a general question from an issue we just went through and am interested to hear feedback on this. I have done work in at least 20 states and 5 countries in my career and have never seen this happen before. We scoped for a surveyor to do a topographic survey, including...
Hello,
We are proposing 600' of fused HDPE (SDR 17) pipe that will be placed above ground for storm water conveyance. Due to ground conditions a bury is not possible. From the inlet we are looking at a initial 200' run of pipe at a 4% slope, with a slope of 11% to 15% in the remainder of the...
We have a situation where we are designing an underground (roadway on top of it) limestone rock outfall (150'L x 20'W x 4'D) that will transfer water from a pond for treatment. At the end of the rock outfall we will have a culvert to discharge flows downstream. The culvert is easy enough to...
We have a situation at a mine site where we are designing a underground (roadway on top of it) limestone rock outfall (150'L x 20'W x 4'D) that will transfer water from a pond for treatment. At the end of the rock outfall we will have a culvert to discharge flows downstream. Easy enough to...
I have an existing 84" culvert that I need to install an orifice plate on to control flows. Has anyone ever constructed anything like this before? Would an orifice plate of this size tend to warp under water pressures over time?
When calculating headwater of a culvert does the size upstream basin within the roadside ditch come into play? As an example, if you have 5cfs of flow into 12" culvert and you calculate that the headwater would be 1ft above the crown of pipe. Would this 1ft calculation differ if you have a 10%...
Hello,
I am designing a running track as a volunteer for an elementary school. 1/8 mile oval track with a 12' wide concrete running surface (will be overlay with a poly surface down the line). The section for the track I used is a 4" thick concrete section with rebar. Would calling out...
Hello,
Would anyone know of a good program to help with design of an asphalt pavement section for a commercial driveway? I have heard that AASHTO has one but cant seem to find it. What I am trying to do is verify a 4"/10" section that was put on a set of plans with truck traffic and subgrade...
We have a small (150ft) length of roadway that is being used as a wet crossing. It is a 12" culvert will the 150ft length of concrete driveway pured over top of it. We want to raise this roadway max 2' and install 2-15" culverts. Before concrete is poured on old concrete is a bonding agent...
Creek restoration project on the downstream 1000' where we are widening the channel and placing rip rap. Velocity in channel gets as high as 11-12fps. Install energy disipation measures at confluence with major waterway. Energy disipation includes wideing channel, placing larger rip rap, and...
im a civil engineer specializing in land development and took on a task as a volunteer to design a running track and softball field for my daughters elementary school. Space is limited so a normal 400M (1/4 mile) track will not fit in the land available. This is fine as its an elementary...
Hello,
I have two reservoirs being created in an extensive erosion control design. One sits with maximum water elevation of 200' while the other sits downhill with a maximum water elevation of 185'. They both discharge into the same pipeline which connects into an existing 12" at an elevation...
Hello,
We have modeled a sedimentiation pond with a 6" pipe outlet that discahrges 2500' downstream. We have about 40' of drop between the pond and outlet but we do have a few areas of low spots in the pipe (pipe sits on grade). We are trying to analyze if we have enough head to push the...
I have a question on how to determine head within a pipe system. I am not an expert pressure pipe system analyst. We have a sedimentation pond with an 6" HDPE pipe line draining water from it. The outlet of our pipe is at 505 at the pond and the pipe will be layed on the ground, downhill to...
We have a project where we are simply reshaping 2000' of creek. In the process we are going to be creating some cut material which we are going to be allowed to placed above the creek as long as positive flow is maintained to creek. Fill above creek bank will be 1' in depth and extended 7'...
Anyone have any thoughts on using 1 1/4"-0 base rock under ashphalt instead of 3/4"-0? Both compact very well. I have seen 1 1/4" used often but always with a 2" leveling course which I really dont think is needed.
Hello,
We have a jurisdiction with a detention requirement that you only need to detain the 100yr storm. Their conveyance design storm is the 25 year storm. Has anyone ever ran into such a requirement? If your conveyance system is only going to handle the 25year storm you would need a...
Modelled a pipe system using the rational method and by the use of a spreadsheet. Pipe system discharges to a pond. Is it possible to use the rational method discharge data into the pond and model the pond in Hydrocad?
We have a 50ac site that we are trying to do a pre-development analysis for. The site has 3 basins..
Basin 1 - Sheet flows to NE
Basin 2 - Sheet flows to SW
Basin 3 - Collected in a piped conveyance system and discharges to the SE.
Although the basins discharge at different points on the site...
We have a large (40ac) site where we are doing improvements in 3 locations that includes demo and adding facilities/infrastructure. We want to analyze the need for detention over all 3 areas combined. What would be the best way to do this. Could you just analyze the pre/post for just the...
