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How is rain water dealt with in a secondary confinement facility such as a dyke that surrounds an above ground storage tank? Thanks.

Is surface hardening the same thing as when they put hardening powder on the surface of a slab....like in a machine shop?

I should clear this up so you don't think I was trying to compare the 225k to 87.3k I was comparing 225k/2 to the 87.3k.

I am looking at the value in the beam tables for A36 channels C15x40. The allowable load where shear starts to control is 225k. When I use F4-1 i only get a allowable of 87.3k. Where am I missing something? I'm using the dimensions "T" and "tw" for the area of the web. Thanks.

Can anyone explain to me what is meant in terms of connection types, when the threads are included or exluded in the shear plane? In practice when would use use one or the other? Thanks.

What is the reasoning in not allowing aluminum conduit to be cast into concrete?

What is the difference in a snug-tight connection and a pretensioned connection if they both ultimatly rely on the bearing value of the bolt for load transfer? Thanks.

IBC 2003 states in section 1802.2.6 that a soil investigation must be performed. Then in 1802.2.7 there is an exception talking about using a diffent Sds. Does this apply to 1802.2.6 as well? If not why wouldn't it? Can anyone shed some light on this? Thanks in advance.