Most of these records have copyrights, thus you might not be able to have them for free, I already made a quick research and ended with the CSI's (Construction Specification Institute) documents. They make reference also to the AIA contract documents. Their web is www.csinet.org
Two very good reference books I use:
Ven Te Chow, Open Channel Hydraulics, McGraw-Hill, 1959
Ram S. Gupta Ram S., PhD Gupta ,
Hydrology & Hydraulic Systems, Waveland Press Inc, 1989
Have an existing storm sewer project, need to specify a method to unclog, clean, flush and legally dispose of the sediments and debris. Is there any web link or ideas from your experience might like to share?