Greg,
Try this. Model your detention/retention area as a pond with only the 0.5" orifice outlets. Then direct the flow into a second pond where you describe the elevations, volume and outlets of the riser itself. This should get around trying to figure out how to direct which orifice to...
I moved into a house 3 years ago that had a new garage with a wood floor and basement underneath. The floor is painted 3/4" plywood on 2x12 joists 12" OC. The joist span is about 13 feet. The previous owner had built the garage and had placed diamond plate over the plywood in the...
compfly,
TR-55 is a special case of TR-20. When TR-20 was developed, only large computer centers could run it, so they developed TR-55 with its associated nomographs so that the local engineer could use it. It is based, I believe on an average curve number of 65. The further your weighted...
I usually figure a maximum of 8", although 5 to 7 inches is more common. If a car door can open over the curb, and the drainage is adaquately controlled I generally feel that it is ok.
We don't do a lot of it, but we have devised a system that works for us. We create a block that has the text within a 3dface that is set at an elevation greater than all other elevations in the drawing. A 3d face will not hide text, but will hide everything at a lower elevation. We then use...
It depends on what you are trying to do. We use HydroCAD for site development stormwater management reports etc., and it works fine.
There is a forum on this site under Engineering Computer Programs that deals with it.
Good luck.
Ed
What a wonderful series of posts on a subject that sorely needs discussing. I am in agreement with much of what has been discussed.
From my point of view, that of being a civil engineer for over 30 years, what is needed most is to educate the general public about our professionalism...
Thanks n3rei for your response. I've known for a while now what the Town thinks they want, a sheet plastic insert that is held by and extends downward from the frame into the structure throat for about two feet. The detail itself is simple to draw.
However, being an old construction engineer...
It has been my experience that using the Rational Method on culverts yields a pipe diameter that is safe for the particular storm frequency. However, in drainage systems, it fails to take into account the time of transport, the inlet and outlet conditions of each individual pipe run, and since...
You have to model your CB as two ponds. One on top of the grate, and the other, the CB itself. When modeling the one one top of the grate, the primary outflow is through the horizontal grate. Play with it until the flow closely approximates the manufacturer's numbers. The rest overflows the...
Thanks for your response. I think they are refering to a device that fits under the catch basin grate and extends down into the basin. I think its purpose is to protect the riser structure from the effects of road salt, etc.
I know there are devices that fit under the grate and catch...
One of the Towns where we do work is requiring that all catch basins be constructed with a "polyethylene liner downspout". Of course they want me to provide a detail on my plans. Does anyone know what these are called, who makes them, or where I can get my hands on a detail?
Ed
It has been a long time since I used a spreadsheet to route stormwater flow. I've been using HydroCAD since it first came out in the mid 80's. Try their website. I think they have a demo version that you can use.
