7505 SEAWAY BLVD SEPA 016 - 034 - SEAWAY TRANSIT CENTER Land Use Decision Documents 2025-04-22

15-Minute Timestep, Water Quality Treatment Design Discharge On-line Design Discharge Rate (91% Exceedance): 0.31 cfs Off-line Design Discharge Rate (91% Exceedance): 0.17 cfs Infiltration/Filtration Statistics Inflow Volume(ac-ft): 1007.08 Inflow Volume Including PPT-Evap (ac-ft). 1007.08 Total Runoff Infiltrated (ac-ft): 0.00, 0.00% Total Runoff Filtered (ac-ft): 0.00, 0.00% Primary Outflow To Downstream System (ac-ft). 1006.88 Secondary Outflow To Downstream System (ac-ft): 0.00 Percent Treated (Infiltrated+Filtered)/Total Volume: 0.00% ********** Link: POC ********** 2-Year Discharge Rate : 0.030 cfs 15-Minute Timestep, Water Quality Treatment Design Discharge On-line Design Discharge Rate (91% Exceedance): 999.00 cfs Off-line Design Discharge Rate (91% Exceedance): 999.00 cfs Infiltration/Filtration Statistics Inflow Volume (ac-ft): 1006.88 Inflow Volume Including PPT-Evap (ac-ft): 1006.88 Total Runoff Infiltrated (ac-ft): 0.00, 0.00% Total Runoff Filtered (ac-ft): 0.00, 0.00% Primary Outflow To Downstream System (ac-ft): 1006.88 Secondary Outflow To Downstream System (ac-ft): 0.00 Percent Treated (Infiltrated+Filtered)/Total Volume: 0.00°/0 ***********Compliance Point Results ************* Scenario Predeveloped Compliance Link: POC Scenario Postdeveloped Compliance Link: POC *** Point of Compliance Flow Frequency Data *** Recurrence Interval Computed Using Gringorten Plotting Position Predevelopment Runoff Postdevelopment Runoff Tr(Years) Discharge (cfs) Tr(Years) Discharge (cfs) 2-Year 5.773E-02 2-Year 2.994E-02 5-Year 9.853E-02 5-Year 6.223E-02 10-Year 0.123 10-Year 9.530E-02 25-Year 0.158 25-Year 0.119 50-Year 0.190 50-Year 0.146 100-Year 0.229 100-Year 0.169 200-Year 0.309 200-Year 0.375 ** Record too Short to Compute Peak Discharge for These Recurrence Intervals **** Flow Duration Performance**** Excursion at Predeveloped 50%Q2 (Must be Less Than 0%)• -2.7% PASS