Surface Water Design Manual

Updated November 1, 2017

In response to flooding within the City of Kenmore, Chapter 4 of the Bothell Standards has been revised to require a Type 3 downstream analysis and Level 3 flow control for all projects draining to the Little Swamp Creek basin. View the updated Bothell Surface Water Design Manual as a PDF.

The City incorporated and published the original 2016 Bothell Surface Water Design Manual as Chapter 4 in the Bothell Design and Construction Standards on December 30, 2016. The changes to Chapter 4 are effective immediately. 
Here is a copy of the previous Surface Water Design Manual for those who were permitted prior to December 30, 2016 and will be under construction prior to 2022.