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<br /> WORKSHEET 2: Runoff Curve Number And Runoff <br /> . Project: Cottage Villas Calculated By: CNC <br /> Project No. 92-111 Date: 10-22-92 <br /> Location: Arden Hills Checked By: <br /> File: TR-55'wR1 Date: <br /> Drainage Basin: <br /> Pre development Condition <br /> Runoff Curve Number (CN) <br /> Soil name Cover Description CN Area Product <br /> and of <br /> hydrologic (cover type, treatment, and from in CN x A/'e'a <br /> group hydrologic condition; <br /> percent impetvious; X_ Table 2-2 X_acres <br /> unconnecte&conn~ed _ Fig, 2-3 _sq.mi. <br /> (Aooendix A) impetvious al'l?a ratio Fiq, 2-4 0/0 <br /> Udorthents Clayey Sand with Weeds 60 I 2,5 150,0 <br /> . <br /> I <br /> TOTALS 2,5 150,0 <br /> GN (weighted) = total product I total area = 60,00 <br /> Us",CN = I 60 I <br /> Runoff <br /> ! Stonn #1 I Stonn #2 I Storm #3 ! <br /> Frequency, yr. I 1 I 10 I 100 I <br /> Rainfall, P (24-hour), in. I 2.4 : 4.2 5,9 <br /> Potential Retention,S, in, I 6,67 ! 6.67 6,67 <br /> Runoff, Q, in, I 0.15 I 0.86 I 1,86 <br /> . TR-55 <br /> 3 <br />