Instructions / Assembly

Page A5
7/07
PROPER GUTTER AND DOWNSPOUT SIZING
TABLE 1-2
RAINFALL DATA AND DRAINAGE FACTORS (Continued)
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
7.4 187 160 2.30 10.4 265 110 1.70
7.1 181 170 2.40 9.9 251 120 1.70
1.8 46 660 9.50 3.1 77 390 5.70
1.8 46 660 9.50 2.4 61 500 7.20
7.4 188 160 2.30 10.5 267 110 1.60
2.3 57 530 7.60 4.5 114 270 3.90
2.1 53 570 8.3 5.2 133 230 3.30
6.7 170 180 2.60 9.3 236 130 1.90
4.0 102 300 4.30 6.7 171 180 2.60
4.5 115 270 3.80 6.4 169 180 2.60
6.5 165 190 2.70 9.1 232 130 1.90
6.0 152 200 2.90 8.4 213 140 2.10
6.7 169 180 2.60 9.2 235 130 1.90
7.3 185 160 2.40 9.8 250 120 1.80
6.6 167 180 2.60 9.8 250 120 1.80
6.8 172 180 2.50 9.3 236 130 1.90
6.3 160 190 2.70 8.8 223 140 2.00
7.6 193 160 2.30 10.5 267 110 1.60
2.2 56 550 7.90 3.8 97 310 4.50
2.1 53 570 8.30 3.0 76 400 5.80
6.8 172 180 2.60 9.4 238 130 1.80
6.4 163 190 2.70 8.8 224 140 2.00
5.6 143 210 3.10 7.8 198 150 2.20
7.2 184 170 2.40 9.4 238 130 1.80
7.4 187 160 2.30 10.0 253 120 1.70
6.7 169 180 2.60 9.0 229 130 1.90
7.6 193 193 160 10.5 267 110 1.60
7.6 194 160 2.30 10.5 267 110 1.60
8.2 208 150 2.10 10.8 274 110 1.60
7.6 193 160 2.30 10.5 267 110 1.60
3.0 75 410 5.80 5.2 131 230 3.30
2.8 71 430 6.20 4.3 108 280 4.10
7.1 181 170 2.40 9.5 242 130 1.80
2.1 53 570 8.30 3.3 84 360 5.20
2.1 53 570 8.30 3.5 90 340 4.90
6.6 168 180 2.60 9.1 230 130 1.90
6.8 172 180 2.50 9.5 241 130 1.80
6.6 168 180 2.60 9.1 232 130 1.90
5.7 146 210 3.00 9.9 252 120 1.70
MISSOURI: Kansas City
Saint Louis
MONTANA: Helena
Missoula
NEBRASKA: Omaha
NEVADA: Reno
Las Vegas
NEW JERSEY: Trenton
NEW MEXICO: Albuquerque
Santa Fe
NEW YORK: Albany
Buffalo
New York City
NORTH CAROLINA: Raleigh
NORTH DAKOTA: Bismark
OHIO: Cincinnati
Cleveland
OKLAHOMA: Oklahoma City
OREGON: Baker
Portland
PENNSYLVANIA: Philadelphia
Pittsburgh
RHODE ISLAND: Providence
SOUTH CAROLINA: Charleston
TENNESSEE: Memphis
Knoxville
TEXAS: Fort Worth
Dallas
Houston
San Antonio
UTAH: Provo
Salt Lake City
VIRGINIA: Norfolk
WASHINGTON: Seattle
Spokane
WEST VIRGINIA: Parkersburg
WISCONSIN: Madison
Milwaukee
WYOMING: Cheyenne
These intensities are based on records and statistical projections. They may occasionally be exceeded either in the general area or at small areas within the designated city.
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