From the library website, go to "Resources by Subject" tab and select "Civil Engineering." Go to the Civil Engineering Research Guide.
Select the "Find Books" tab and conduct a search in CRC Press and Knovel for the term stormwater detention. You will be guided to chapters of useful handbooks that you can print out in pdf.
Then go to the tab Water and Wastewater and navigate to the stormwater subpage for web resources.
You can search the library catalog for the book, Stormwater Collection Systems Design Handbook as well.