There is are a slew of books/whitepapers that you should have the first of which should be Applied Hydrology, CHOW/MAINDMENT/MAYS, 1988, then the bible for OPEN CHANNEL HYDRAULICS, CHOW, 1959; and finally a "catch all book", STORMWATER COLLECTION SYSTEMS DESIGN HANDBOOK, Larry W. Mays, 2001 (McGraw-Hill). The last book I cited covers a broad collection of drainage design procedures and references. I purchased it back then and keep it on my shelf for the younger engineer to use as a reference source. Hope this helps.