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Flatirons, Inc. — Surveying & Engineering <br />APPENDIX A <br />Hydrology Computations <br />➢ Land Use Assumptions <br />o NOAA Rainfall intensity maps <br />o NRCS soils maps and descriptions <br />o NRCS Runoff Curve Number Chart <br />➢ Developed Runoff <br />o Runoff Curve Number determination <br />o Time of Concentration calculations (Tc) <br />o Peak Q calculations <br />o Design point calculations <br />• <br />Union Mill A March 5, 2014 <br />