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Pervious Time of Concentration: <br />Assumed minimum 3.00 min <br />Total Pervious Time of Concentration 3.00 min. <br />Impervious Time of Concentration <br />68 If sheetflow, asphalt, S=1.10% 1.62 min. <br />495 If channel, pipes, S=0.50% 2.78 min <br />Total Impervious Time of Concentration = 4.40 min. <br />The developed storm water runoff rates can be found in Table 3— Developed Storm <br />Water Flows, and the Stormshed calculations can be found in Appendix A— Basin <br />Summaries. The * 6-month and * 100 year flow rates reflect the flows which will be <br />collected from the paved areas and routed to the treatment system, see "TreatmenY' <br />basin in the Stormshed calculations. The 2, 10 and 100 year rates reflect the overall <br />flows from the entire site. <br />Table 3. Developed Storm Water Flows <br />Water Qualitv: <br />During the construction phase of the project, temporary siltation control structures will <br />be installed. At a minimum: <br />• A silt fence will be installed if required to prevent silt laden runoff from leaving <br />the site. The likely location will be along 100TH Street. <br />• Exist;ng catch basins will be protected by catch basin inserts as shown on the <br />construction plans. <br />• A temporary construction entrance will be installed per the TESC plan and <br />ci?y standard detail 205A. <br />• A construction staging area will be utilized for equipment/material storage and <br />equipment maintenance during construction. <br />�'J <br />M:1Sdg�2004�259-SDG-04 - FSI - Horizon Bank in EverettlDRAIN1Drainage Analysis-259.doc <br />� <br />