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August 2,2000 85 <br /> Apache Plaza Animal Hospital Addition <br /> Page 2 <br /> r• <br /> Drainage calculations are attached showing the flows for the one-year,ten-year and 100-year rainfall <br /> events.The calculations are summarized in the table shown below: <br /> One Year Event . 10 Year Event 100 Year Event, <br /> Drainage Area Existing Developed Existing Developed Existing Developed <br /> Conditions Conditions Conditions Conditions Conditions Conditions <br /> North to the tracks 0.2 cfs 0.5 cfs 0.7 cfs 1.3 cfs 1.4 cfs 2.3 cfs <br /> South to 37"Avenue 0.6 cfs 0.3 cfs 1:1 cfs 0.7 cfs 1.8 cfs 1.3 cfs <br /> NE <br /> East to the adjacent 0.1 cfs 0.0 cfs 0.2 cfs 0.1 cfs 0.5 cfs 0.2 cfs <br /> parcel <br /> As can be seen,the discharge rate of stormwater directed to 376 Avenue NE and to the east is reduced <br /> with the developed conditions. However,the discharge rate to the north is increased. <br /> A submission to the Rice Creek Watershed district is required. Since this parcel is part of a parcel of land <br /> greater than 5.00 acres, it is required to submit an application to the Rice Creek Watershed District. This <br /> submission will be made no later than August 10, 2000 so it can be on the August 23`d regularly <br /> scheduled meeting. <br /> Silt fence will been installed. Turf establishment such as seeding and/or sod will be placed as soon as <br /> possible when construction of the and parking areas are completed. <br />