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time. <br /> The tenth column, labeled 'IQ cf s (Sum CAxI) 11, is simply the product <br /> of the respective area's "Sum CA" and "I in/hr from curve" <br /> columns. <br /> The eleventh column, labeled "Slope ft/ft", is the average slope <br /> for the respective area's surface or drainage ditch as appropriate. <br /> The twelfth column, labeled "Area of Ditch", is the computed cross <br /> sectional area of the respective area's perimeter ditch. <br /> The thirteenth column, labeled "Computed Velocity (ft/sec) ", is the <br /> actual velocity within the respective area's perimeter drainage <br /> ditch. <br />