Document: NRC Regulatory Guide
Document ID: c7b1689b-ff17-4083-9fb1-f91b6965ea1a
Document Type: regulatory_guide
Title: Design Basis Floods for Nuclear Power Plants + HISTORY - HISTORY 02/2022 – DG-1290 , Proposed Revision 3 09/2014 – Periodic Review of Revision 2 – Revise 07/1980 – Errata to Revision 2 07/2024 – DG-1290 Revision 1 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740388.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.59
CFR Part: 
CFR Title: 

Content:
ART REPRESENT ENVELOPED VALUES OF PEAK RUNOFF FROM 10.OOO4OUARE MILE DRAINAGE AREA UNDER NATURAL RIVER CONDITIONS. ACCORDINGLY. PUF VALUES OBTAINED DO NOT INCLUDE POSSIBLE CONTRIBU. TIONS TO PEAK FLOW THAT WOULD RESULT FROM UPSTREAM DAM FAILURES OR OTHER UNNATURAL EVENTS. .. . 121 1190 117,1 115o 1130 1110 19o 107 1050 1030 1010 990 970 B5e 930 910 o n 870 850 830 FIGURE 8.6 PROBABLE MAXIMUM FLOOD (ENVELOPING PMF ISOLINES) FOR 10.000 SQUARE MILES ... ( r Q I M I N 1, 0 IF ; 0 0 Z 6f i ý ROETE: PMF rJOt.NES ON THIS CHART REPRESENT ENVELOPED 1400, 100 VALUES OF PEAK RUNOFF FROM 20.000-SUARE MILE DRAINAGE "Pm VALUE•S OBTAINED 00 NOT INCLUDE POSSIBLE CONTRIt- •% 1IONS T'O PEAK FLOW THAT WOULD RESULT FROM UPSTREAM DAM P2 DAM FALRSOR OTHER UNNATUAL EVENTS. ii° 119e 1*7 115° 113° 11 i09° " os i0o0°13° , i01° 99p° g 95P g°93° 91° 89 87° 5 3 FIGURE B.7 PROBABLE MAXIMUM FLOOD (ENVELOPING PMF ISOLINES) FOR 20,000 SQUARE MILES y 'a I I I I I I I I 1 I -EXAMPLE: FOR DRAINAGE AREA OF .2,300 S. MI.AT LAT. 43@, LONG. 950, DETERMINE PMF PEAK DISCHAR.GE. I I II I • I i'- : . . I- -I .4 ;tI ; ; i , - 4 -4 4 I • • I I- I Si Wil I I ii -%SLUTIUN: FOR DRAINAGE AREA OF 2,300 SO. MI., PMF PEAK 4,00CF&. " I I I, ,______.... __ I I I 11 I...11L..!. 100 1000 10,000 DRAINAGE AREA, SQUARE MILES FIGURE B.8 EXAMPLE OF USE OF ENVELOPING ISOLINES S-C I jul11 g *iWW IULm < co a 0. u: ,c< 0 00 L1A .j m 0 i . m. Im,,, 10 100,000 /'If]"POINTS FROM I .. ." FIGURES B;.2-B.7 d X X I I I I I I I I I I I air J!•d• I ilia y TABLE B.1 PROBABLE MAXIMUM FLOOD DATA (Page 1 of 17) K "Drainage Basin Average PM? Peak Project State River Basin Stream Area (n inches) Discharge North Atlantic Region (Northeast Atlantic Sub-reion) Ball Mountain Barre Falls Beaver Brook Birch Hill Black Rock Blackwater Buffumville Colebrook Conant Brook East Barre East Branch East Brimfield Edward McDowell Everett Franklin FClas Hal Meadow Hancock Hodges Village Hop Brook Hopkinton Knight••lle Littleville