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s? s s ss s ss s? ss ss ss s s GIs ss ss s ss ss ?s <br />IDF TABLE FOR ZONE ONE IN THE STATE OF COLORADO <br />Zone 1: South Platte, Republican, Arkansas, and Cimarron River Basins <br />Project: Parkdale Quarry Stormwater Drainage Report <br />Enter the elevation at the center of the watershed: Elev = 5,900 (input) <br />1. Rainfall Depth-Duration-Frequency Table <br />Fntar the 6-hnur and 24-hour rainfall denths from the NOAA Atlas 2 Volume III in rightmost blue columns <br />Return Rainfall De th in Inches at Time Duration <br />Period 5-min 10-min 15-min 30-min 1-hr 2-hr 3-hr 6-hr 24-hr <br />1 (2) (3) (4) (5) (6) (7) (8) (9) (10) <br /> output output output output output output output input input <br />2- r 0.22 0.34 0.43 0.60 0.75 0.87 0.96 1.10 1.60 <br /> 0.32 0.50 0.63 0.87 1.11 1.21 1.28 1.40 2.00 <br /> 0.39 0.60 0.76 1.06 1.34 1.43 1.50 1.60 2.40 <br />R5- 0.47 0.73 0.93 1.29 1.63 1.76 1.85 2.00 2.80 <br /> 0.55 0.86 1.09 1.51 1.91 2.01 2.08 2.20 3.00 <br /> 0.63 0.98 1.24 1.71 2.17 2.25 2.31 2.40 3.40 <br />Note: Refer to NOAA Atlas 2 Volume III isopluvial maps for 6-hr and 24-hr raintall depths. <br />2_ Rainfall Intensity-nuration-Frenuencv Table <br />Return Rainfall Intensity in Inches Per Hour at Time Duration <br />Period 5-min 10-min 15-min 30-min 1-hr 2-hr 3-hr 6-hr 24-hr <br />1 (2) (3) (4) (5) (6) (7) (8) (9) (10) <br /> output output output output output output output output output <br />2- r 2.62 2.04 1.72 1.19 0.75 0.44 0.32 0.18 0.07 <br />5- r 3.85 2.99 2.52 1.75 1.11 0.60 0.43 0.23 0.08 <br />10- r 4.66 3.62 3.05 2.12 1.34 0.71 0.50 0.27 0.10 <br />25- r 5.68 4.41 3.72 2.58 1.63 0.88 0.62 0.33 0.12 <br />50- r 6.64 5.15 4.35 3.02 1.91 1.00 0.69 0.37 0.13 <br />100- r 7.55 5.86 4.94 3.43 2.17 1.12 0.77 0.40 0.14 <br />UD-RainZone v1.01a.xls, Z-1 1/22/2008, 9:25 AM