Instructions / Assembly

Page A4
7/07
PROPER GUTTER AND DOWNSPOUT SIZING
ALABAMA: Birmingham
Mobile
ALASKA: Fairbanks
Juneau
ARIZONA: Phoenix
Tucson
ARKANSAS: Bentonville
Little Rock
CALIFORNIA: Los Angeles
Sacramento
San Francisco
San Diego
COLORADO: Denver
Boulder
CONNECTICUT: Hartford
DISTRICT OF COLUMBIA
FLORIDA: Jacksonville
Miami
Tampa
GEORGIA: Atlanta
HAWAII: Honolulu
Kahului
Hilo
Lihue
IDAHO: Boise
ILLINOIS: Chicago
INDIANA: Indianapolis
IOWA: Des Moines
KANSAS: Wichita
KENTUCKY: Louisville
LOUISIANA: New Orleans
MAINE: Portland
MARYLAND: Baltimore
MASSACHUSETTS: Boston
MICHIGAN: Detroit
MINNESOTA: Minneapolis
TABLE 1-2
RAINFALL DATA AND DRAINAGE FACTORS
7.5 191 160 2.30 10.1 256 120 1.7
8.2 208 150 2.10 10.8 274 110 1.6
2.1 53 570 8.30 3.8 97 310 4.5
1.7 43 700 10.10 2.3 57 530 7.60
5.6 141 220 3.10 8.8 224 140 2.00
6.1 155 200 2.80 9.1 232 130 1.90
7.4 187 160 2.30 10.2 259 120 1.70
7.4 187 160 2.30 10.0 253 120 1.70
4.9 124 250 3.50 6.7 170 180 2.60
2.5 64 480 6.90 3.9 100 310 4.40
2.7 68 450 6.4 3.7 93 330 4.70
2.2 57 540 7.80 3.1 78 390 5.60
5.7 146 210 3.00 9.1 232 130 1.90
6.4 164 190 2.70 9.4 238 130 1.80
6.2 158 190 2.8 8.7 221 140 2.00
7.1 180 170 2.4 9.7 247 120 1.80
7.9 200 150 2.20 10.1 256 120 1.70
7.7 195 160 2.20 9.8 250 120 1.80
8.3 212 140 2.10 10.8 274 110 1.60
7.3 186 160 2.4 9.9 251 120 1.70
8.7 221 140 2.00 12.0 305 100 1.40
7.0 177 170 2.50 12.0 305 100 1.40
17.4 442 70 1.00 19.2 488 60 0.90
10.4 265 110 1.70 14.4 366 80 1.20
1.8 46 660 9.50 3.3 84 360 5.20
6.8 172 180 2.60 9.3 236 130 1.90
6.8 173 180 2.50 9.4 239 130 1.80
7.3 186 160 2.40 10.3 262 120 1.70
7.5 191 160 2.30 10.5 267 110 1.60
6.9 175 170 2.50 9.4 238 130 1.80
8.3 211 140 2.10 10.9 277 110 1.60
5.4 136 220 3.20 7.6 192 160 2.30
7.1 181 .170 2.40 9.7 247 120 1.80
5.3 134 230 3.3 7.2 183 170 2.40
6.4 162 190 2.70 8.9 226 140 1.90
7.0 178 170 2.50 10.0 253 120 1.70
BA
STORMS WHICH SHOULD BE STORMS WHICH SHOULD BE
EXCEEDED ONLY ONCE IN EXCEEDED ONLY ONCE IN
10 YEARS 100 YEARS
Intensity lasting Calculated roof area Intensity lasting Calculated roof area
5 minutes drained per 5 minutes drained per
downspout area downspout area
in/hr mm/hr sq/ft sq m/ in/hr mm/hr sq/ft sq m/
sq in 100 sq mm sq in 100 sq mm
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