2328 103RD ST SW 2024-11-08 - Laserfiche WebLink

CITY OF EVERETT Permit Services The comments below were generated from this project’s City of Everett Stormwater Reviewers. All questions shall be routed through this project’s Public Works Reviewer with City of Everett Permit Services. # Document Sht/Pg Reviewer’s Comment Designer’s Response Initials Review Comments from DEPARTMENT NAME: __Surface Water Management____________ , REVIEWER NAME: __Cindy Cullen______________________ 1 Memorandum - Does the existing ditch in front of the property serve as an overflow for the stream to the west? The storm drain conveying the stream is 18”, so I assume that is why the frontage pipe was required to be 18”. However, I was not the original reviewer. If the existing ditch and proposed storm drain does not act as overflow conveyance, provide supporting information in your memo to address this. Alternatively, provide calculations to demonstrate that the 12” pipe can support its drainage area plus overflow from the stream. I have outdated plans, but I am seeing a storm drain crossing rd 103 that we do not have on City mapping. Does your basin area include that storm drain? Or does that pipe discharge to the stream and not to the project’s frontage conveyance? 2 Memorandum - If evaluating a larger area to address #1, refer to our guidance in DCSS 4-3.1(1) and Table 4-3.1(1)-1 for intensity rainfall coefficients. Also refer to DCSS Table 4-3.1 Summary of Stormwater Analysis Standards. The City can provide a rainfall record for use with dynamic modeling.