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You might try the state department of water resources, or the state enineer, or the division of dam safety. It might be stated as a fraction of the probable maximum percipitation (PMP).

Why not push rather than pull?

At 80 acre-feet of storage and 20 ft. height, you are definately geeting into more than the typical farm pond. You need someone experience in dam design to help you out. You will probably also be getting into permitting issues, so the agency will probably require a P.E. certification.

Coal will degrade with water, and, will tend to burn when loose. Coal steam plants usually figure 30 - 90 days max. in a compacted stockpile before the coal ignites.

I don't know of any rule of thumb. You will have to convince your regulators that what you want to use is at least as good of a growing medium as the topsoil. You will probably need to get a biologist, agronomist, or such involved.

In the work I've done, Time of Concentration would be calculated for each subwatershed. In your example, it would be across the lawn to the gutter. Travel time would be calculated to the catch basin. Calculations for outlet works downstream of the catch basin would be calculated based on the...

Mabn is right. If I want to be conservative in fleet sizing, I will use 90% of the 2:1 capactiy, but I have often found the the equipment capacity is even more the the rated volume capacity. Be sure to check the material weights, and not overload the equipment based on weight capacity.

Check with Caterpiller. They do theses types of analysis routinely.

I agree that, if possible, the emergency should be located over native material. If the spillway is located over the embankment, any erosion of the spillway will erode your emankement. Failing that, it should be well armored. It has also been my experience that basins do not get removed when...

You might try contacting an explosives manufacturer, such as DuPont or Atlas.

I know that on at least some occasions, doctors have paid refferal fees to other doctors. Why is this o.k. for an M.D., but not a P.E.

You can determine what the flows whould have been under various rainfall conditions pre and post development of either lot. Ultimately though, you should be discussing this with the city attorney before having any discussions with the land owner about responsibility.

Is the actual grade the problem in dragging a trailer, or the change in grade?

In many parts of the country, subsidence refers to collapse of the surface due to underground extraction, such as mining. In your instance, the geotehnical engineer may be refering to voids caused by some other activity. You should contact the preparer of the report to understand what he means.

You didn't say what the required storm is. If the requirement is for the 10 yr storm, I sould guess using the 25 yr storm would give you more than enough safety factor.

Check with an oil well service company such as Haliburton. They have done things like this before.

For culverts, there are pipe flow nomographs availabe. The ones I use I obtained from the Kentucky Higway Drainage Manual. I suspect most state highway departments will have something similar. Your culvert manufacturer should also have something. For a riser, I generally use the a...

The Department of Water Resources, Division of Dam Safety would be the governing body. They do not regulate dams under 6 ft. high. Embankments that fall under their jurisdiction are required to be designed to pass the 1,000yr. storm. I thnik that is a little too much for this instance. Thanks

I am looking for guidance on selecting the proper storm for spillway design. The embankment will be 3 or 4 foot high. Probably about and acre. It seems to fall under any state requiements for permitting.

Try Dr. Richard Warner @ the University of Kentucky. I believe he was a co-author of the program.