Translate
Public Rule Notice - Stormwater Manuals
Amending the 2021 Surface Water Design Manual
King County has amended the 2021 edition of the Surface Water Design Manual (SWDM), adding bioretention using WA Ecology approved High Performance Bioretention Soil Mixes (HPBSM) as an approved water quality treatment facility and as an allowable flow control best management practice (FCBMP).
Notice of intent to adopt public rules:
Under the authority of King County Code Chapter 2.98, this notice is given of the intent to amend the 2021 SWDM and adopt a revised version of the following King County Water and Land Resources Division (WLRD) public rule: PUT 8-3-6.
The revised rule, PUT-8-3-7-PR Surface Water Design Manual, replaces the current rule. A 45-day comment period ran from March 25, 2024 through May 8, 2024.
Comment period closed
Drafts of the proposed public rule and Surface Water Design Manual amendments are available below:
- Proposed SWDM Public Rule - 126 KB
- Proposed 2021 SWDM 2024 Revision Draft Redlines All - 12 MB zip
- Amended chapter 1 - 1.5 MB
- Amended chapter 5 - 2.4 MB
- Amended chapter 6 - 3.6 MB
- Amended definitions - 614KB
- Amended appendix C - 2.8 MB
- Amended reference 8-M - 1KB
- Amended reference 11-C - 621 KB (no redline version because of large degree of reorganization)
- Amended reference 14-B - 753 KB (no redline version because of large degree of reorganization)
- 2021 SWDM 2024 revision summary of changes - 152 KB