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Page A58/09PROPER GUTTER AND DOWNSPOUT SIZINGTABLE 1-2RAINFALL DATA AND DRAINAGE FACTORS (Continued)ABSTORMS WHICH SHOULD BE STORMS WHICH SHOULD BEEXCEEDED ONLY ONCE IN EXCEEDED ONLY ONCE IN10 YEARS 100 YEARSIntensity lasting Calculated roof area Intensity lasting Calculated roof area5 minutes drained per 5 minutes drained perdownspout areadownspout areain/hr mm/hr sq/ft sq m/ in/hr mm/hr sq/ft sq m/sq in 100 sq mm sq in 100 sq mmMISSOURI: Kansas CitySaint LouisMONTANA: HelenaMissoulaNEBRASKA: OmahaNEVADA: RenoLas VegasNEW JERSEY: TrentonNEW MEXICO: AlbuquerqueSanta FeNEW YORK: AlbanyBuffaloNew York CityNORTH CAROLINA: RaleighNORTH DAKOTA: BismarkOHIO: CincinnatiClevelandOKLAHOMA: Oklahoma CityOREGON: BakerPortlandPENNSYLVANIA: PhiladelphiaPittsburghRHODE ISLAND: ProvidenceSOUTH CAROLINA: CharlestonTENNESSEE: MemphisKnoxvilleTEXAS: Fort WorthDallasHoustonSan AntonioUTAH: ProvoSalt Lake CityVIRGINIA: NorfolkWASHINGTON: SeattleSpokaneWEST VIRGINIA: ParkersburgWISCONSIN: MadisonMilwaukeeWYOMING: Cheyenne7.4 187 160 2.30 10.4 265 110 1.707.1 181 170 2.40 9.9 251 120 1.701.8 46 660 9.50 3.1 77 390 5.701.8 46 660 9.50 2.4 61 500 7.207.4 188 160 2.30 10.5 267 110 1.602.3 57 530 7.60 4.5 114 270 3.902.1 53 570 8.3 5.2 133 230 3.306.7 170 180 2.60 9.3 236 130 1.904.0 102 300 4.30 6.7 171 180 2.604.5 115 270 3.80 6.4 169 180 2.606.5 165 190 2.70 9.1 232 130 1.906.0 152 200 2.90 8.4 213 140 2.106.7 169 180 2.60 9.2 235 130 1.907.3 185 160 2.40 9.8 250 120 1.806.6 167 180 2.60 9.8 250 120 1.806.8 172 180 2.50 9.3 236 130 1.906.3 160 190 2.70 8.8 223 140 2.007.6 193 160 2.30 10.5 267 110 1.602.2 56 550 7.90 3.8 97 310 4.502.1 53 570 8.30 3.0 76 400 5.806.8 172 180 2.60 9.4 238 130 1.806.4 163 190 2.70 8.8 224 140 2.005.6 143 210 3.10 7.8 198 150 2.207.2 184 170 2.40 9.4 238 130 1.807.4 187 160 2.30 10.0 253 120 1.706.7 169 180 2.60 9.0 229 130 1.907.6 193 193 160 10.5 267 110 1.607.6 194 160 2.30 10.5 267 110 1.608.2 208 150 2.10 10.8 274 110 1.607.6 193 160 2.30 10.5 267 110 1.603.0 75 410 5.80 5.2 131 230 3.302.8 71 430 6.20 4.3 108 280 4.107.1 181 170 2.40 9.5 242 130 1.802.1 53 570 8.30 3.3 84 360 5.202.1 53 570 8.30 3.5 90 340 4.906.6 168 180 2.60 9.1 230 130 1.906.8 172 180 2.50 9.5 241 130 1.806.6 168 180 2.60 9.1 232 130 1.905.7 146 210 3.00 9.9 252 120 1.70TECHNICAL REFERENCE APPENDIXThese 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.(800) 523-8852 • Fax (215) 355-7738 • www.bergerbuildingproducts.com