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ATTACHMENTS <br />- Calculation Worksheets - <br />Master Design Summary 8, 9 <br />Basin Hydrographs, 10 Year & 100 Year 10 — 13 <br />Basin Composite CN Values 14 — 17 <br />Time of Concentration Calculations, 4 Basins 18 -21 <br />Retention Pond Volume vs. Elevation 22 <br />Portal Culvers Calculation 23 <br />Diversion Ditches Flow Calculations @Max & Min Slopes 24 — 33 <br />Pond 50: Inlet Channel Calculations. 34 <br />NOAA Storm Isopluvials, Atlas 2, Volume 3 35, 36 <br />Partial USGS Vicinity Maps 37, 38 <br />Drawings <br />Sheet 1 of 5 Future Onsite &Offsite Basins <br />Sheet 2 of 5 Proposed Drainage Improvements <br />Sheet 3 of 5 Drainage Channel Cross - Sections & Details <br />Sheet 4 of 5 Portal Culvert Grading & Details <br />Sheet 5 of 5 Retention Pond 50: Grading & Details <br />