I'm trying to design a culvert for a road that will cross an existing concrete storm drainage channel. The ground water table is above the channel bottom so groundwater is always present in the channel and occupies 20%~50% of the channel depth.
How do I approach this problem? How do I account...
So I know that if I have a retaining wall, I have to provide proper drainage using weep holes or perforated pipes at the side with the higher fill to reduce the hydrostatic pressure acting against the wall.
But what if the grading is equal on both sides of the wall and there is no hydrostatic...
Can anyone tell me the practical difference between RTR and RPM? I went through AWWA C950, AWWA M45 and ASTM D3262 and the only thing mentioned is that RPM contains aggregates while RTR does not.
So what advantage does one offer over the other? Are they suited for different applications or can...
Hello,
I'm designing a drainage system for a small industrial area consisting of a closed drainage system (pipes and catch basins) that will discharge into a retention (not detention) pond.
Right now I only have the IDF curves which can not be used to calculate the volume to be retained in the...
Hello all,
HEC-22 assumes that water is flowing under uniform flow conditions and the pipes are sized so that the pipe capacity is always larger than the incoming flow. On the other hand, computer software (such as stormcad) calculates using gradually varied flow conditions, and the water...
Hello all,
As far as I know, in the design of an urban storm drainage system where drainage pipes pass through residential, local and collector roads, the whole system should be designed for a single return period (say 10-Years) and checked against a higher return period (say 50-Years) for...
Hello,
This may sound like a beginner's question but please bear with me.
I have no problem designing a culvert when the channel has a depth that is comparable to the height of the road. The narrowing of the cross-section at the entrance of the culvert causes water to back up and I design the...
Hi,
I am being tasked with the design of an urban drainage system for an upcoming project in a yet undeveloped desert in the Middle East. I am usually provided with IDF curves for use in the rational method and I do design the drainage system using guidance from HEC-22.
For this particular...
Is the Clark Tc the same as the Tc from TR-55 ? Is it possible to calculate the Clark Tc using the TR-55 methodology (sheet + shallow conc. + channel) ?
