Problem 30: A percel of land is to be developed into 4-acre-lot single family housing. Historical rainfall data are as follows: Time (min) 10-year 2.95 2.08 1.44 0.72 The percel drains to a culvert, and the time of concentration is 7.5 min. Accoring to the figure shown, the C value to be used for the 10-year storm is most nearly: (A) 0.75 (B) 0.79 (C) 0.82 (D) 0.85 5 10 20 60 COEFFICIENT OF RUNOFF 0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 Rainfall Intensity (in./hr) 100-year se-COMMERCIAL SO-APARTMENT CONDOMINIUM an MAY-18 ACRE LOY ANOWLA GLE KAMILYVER ACHECO 20-NOLFAMILY-1 ACRE LOY 3 5.10 3.48 2.38 1.30 4 LAND USE OR DEVELOPMENT TYPE PERCENTAGE OF IMPERVIOUS COVER RCFC & WCD HYDROLOGY MANUAL RUNOFF COEFFICIENT CURVES SOIL GROUP-C COVER TYPE-URBAN LANDSCAPING AMC-II (RUNOFF INDEX NUMBER 69) 3 4 5 RAINFALL INTENSITY IN INCHES PER HOUR 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
Problem 30: A percel of land is to be developed into 4-acre-lot single family housing. Historical rainfall data are as follows: Time (min) 10-year 2.95 2.08 1.44 0.72 The percel drains to a culvert, and the time of concentration is 7.5 min. Accoring to the figure shown, the C value to be used for the 10-year storm is most nearly: (A) 0.75 (B) 0.79 (C) 0.82 (D) 0.85 5 10 20 60 COEFFICIENT OF RUNOFF 0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 Rainfall Intensity (in./hr) 100-year se-COMMERCIAL SO-APARTMENT CONDOMINIUM an MAY-18 ACRE LOY ANOWLA GLE KAMILYVER ACHECO 20-NOLFAMILY-1 ACRE LOY 3 5.10 3.48 2.38 1.30 4 LAND USE OR DEVELOPMENT TYPE PERCENTAGE OF IMPERVIOUS COVER RCFC & WCD HYDROLOGY MANUAL RUNOFF COEFFICIENT CURVES SOIL GROUP-C COVER TYPE-URBAN LANDSCAPING AMC-II (RUNOFF INDEX NUMBER 69) 3 4 5 RAINFALL INTENSITY IN INCHES PER HOUR 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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