1710 W MARINE VIEW DR 2024-01-03

conveyance system constructed as part of this site development will not change the hydraulic capacity of the existing system. 6.2. DOWNSTREAM ANALYIS The downstream conveyance system discharges to two outfalls in the marina. Backwater conditions vary based on tides and the calculations account for projected 2' of sea -level rise during the design life of the system. The new conveyance system is designed to operate in a backwatered condition and meet City of Everett Standards. Refer to Appendix E for the backwater analysis calculations and conveyance system sizing. The proposed treatment vault relies on a weir for control of excess runoff into the vault. During storm events, stormwater can bypass the vault treatment bay using this weir. The weir elevation is set to prevent water from the downstream system backing up into the treatment bay or upstream conveyance system. The proposed development reduces peak discharge rates and the downstream outfalls and conveyance system have sufficient capacity. 7. MINIMUM REQUIREMENTS The minimum requirements for the project are determined per Volume I of the SWMMWW. Per Figure I- 3.2: Flow Chart for Determining Requirements for Redevelopment, all minimum requirements shall apply for this project. See Figure 7-1. A I�