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I am looking for some websites to obtain design storm information such as IDF curves and precipitation depths for designing stormwater facilities. I found the website but was wondering if there are more websites like this. I do work mostly in California but also do work elsewhere in the country...

Does anybody know any specifications for flanged pvc pipes? How are the flanges welded on to the pvc pipe? Are the flanges solvent welded? Can you have a bell end on one side and flanged end on the other? Thanks!

Would it be more cost effective to solvent weld a bell and spigot pvc pipe or would it be more cost effective to use mechanical restraints? Also, is it possible to remove the gasket in an AWWA PVC bell and spigot pipe and solvent weld it?

I remember reading that pinholes in the epoxy coating is all it takes to seriously corrode the underlying material and that the epoxy coating is basically useless when the coating is scratched up. I'm thinking this might be true for galvanic corrosion between two dissimilar metals in contact...

I remember reading that pinholes in the epoxy coating is all it takes to seriously corrode the underlying material and that the epoxy coating is basically useless when the coating is scratched up. I'm thinking this might be true for galvanic corrosion between two dissimilar metals in contact...

The AWWA M11 gives Section modulus = I/c = ? * r^2 * t However, I found in the McGraw Hill Civil Engineering Formulas textbook, Section modulus = I / c = ? (OD^4 - ID^4)/(32 * OD) The results are totally different. Has anybody done any bending moment checks on large pipes/cylinders...

I read that it is 5% for AWWA and 7.5% for ASTM. However I looked through the M23 and it does not give the allowable ring deflection and I also can't find the ASTM document that publish a 7.5% limit. Can someone tell me where I can cite these limits?

AWWA M23 shows how to calculate the Pipe Stiffness for buried pvc pipes. However, it doesn't say what to do with this value. Does anybody know where this PS value is used?

Does anybody know where to find information on calculating the allowable pipe loads or capacity of buried pipes? Are there any comprehensive resources on calculating the capacity of pipes of all types (hdpe, pvc, steel, clay, etc.)? Thanks!

Does anybody know of an equation for calculating a point load (not line load) on a suspended 1-way slab? Treating the point load as a line load is way to conservative.

How do you determine the kh and kv values for the mononobe okabe method? Thanks!

Can anybody tell me of any equations to calculate the seismic earth pressure on retaining walls? The Mononobe-Okabe equations is too complicated for general use. Is there a simpler equation out there? Thanks!

http://en.wikipedia.org/wiki/Lateral_earth_pressure When I use the following values, the Kp coefficient a whopping 46!!! pheta = 5 beta = 20 phi = 30 delta = 15 When using some other combinations, the Kp value can reach in excess of 100! Is the Coulomb's passive pressure equation flawed?

Can somebody explain to me what is the difference between, normal, mid range, and high range water reducers? Thanks!

I have a few questions regarding PVC pipes (6" and larger). 1.) What is the difference between ASTM D1785 (Scheduled), ASTM D2241 (SDR), and AWWA 900,905? 2.) Are the ASTM pipes solvent welded bell & spigot pipes, while the AWWA pipes are gasketed bell & spigot? 3.) Are solvent welded...

Does anybody know what companies sell 4" thread-o-lets in the U.S.? Thanks.

Why is it important to insulate flanges at transitions between below grade and above grade interface? What does it do? Also why is it important to weld bond wires to pipe? What is the advantage of making the pipe conduct? Thanks!

Are there any advantages of staggering the top and bottom matt reinforcing in a suspended slab? I've seen it done this way but can't really visualize how this is better. It seems much harder for setting up the rebar chairs.

Anybody know if there is a pipe schedule for pipes larger than 48"? Is there a size standard for steel and pvc pipes larger than 48"?

It is recommended that mudslabs be used for blindside waterproofing under structural slabs. Besides providing a flat working surface, what other benefits do mud slabs provide? How do I determine whether it is really necessary.