                    Environment Canada/Environnement Canada
                                        
           Short Duration Rainfall Intensity-Duration-Frequency Data
          Donnes sur l'intensit, la dure et la frquence des chutes
                            de pluie de courte dure
                                        
                 Gumbel - Method of moments/Mthode des moments
                                        
                                   2025/12/5
                                        
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 DAWSON                                                 YT        2100LRP       
 (composite)         
 Latitude:  64 4'N     Longitude: 139 7'W    Elevation/Altitude: 370        m
 
 Years/Annes :  1976 - 2024          # Years/Annes :     35   
 
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Table 1 : Annual Maximum (mm)/Maximum annuel (mm)
 
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          Year  5 min 10 min 15 min 30 min    1 h    2 h    6 h   12 h   24 h
         Anne
          1976    5.8    8.4   11.9   13.7   15.8   17.0   18.0   18.0   18.5
          1977   13.7   15.2   15.2   15.2   15.5   15.5   20.2   20.8   22.6
          1978    3.0    3.4    3.4    3.4    3.9    6.5   10.4   12.2   21.7
          1979    5.1    7.7    8.1    8.1    8.2    9.6   14.9   20.8   24.8
          1980    3.6    4.6    6.3    8.0   11.9   14.8   18.9   23.8   23.8
          1981    6.0    7.0    7.7    7.9   11.4   11.6   13.2   18.2   22.3
          1982    2.9    4.7    5.3    6.3    6.4    8.3   12.6   13.4   16.3
          1983    1.6    2.3    2.7    3.4    6.6    8.6   11.0   12.8   14.0
          1984    3.7    5.2    5.2    5.4    6.0    9.6   10.2   10.7   13.9
          1985    2.1    3.8    4.0    5.7   10.2   14.0   15.3   17.0   17.7
          1986    7.5   10.0   10.2   10.2   10.3   11.5   12.0   12.0   13.7
          1987    2.7    4.3    5.5    7.5    7.8    8.9   13.3   20.7   23.4
          1988    1.5    2.2    2.5    4.2    5.7    5.9   11.2   18.7   21.2
          1989    2.8    3.6    3.6    3.8    5.5    7.0   10.5   11.8   12.4
          1990    6.8    7.1    8.1    9.4   11.7   11.8   12.2   14.3   25.7
          1991    5.0    7.5    8.5   13.1   14.4   14.4   14.4   17.6   29.6
          1992    5.4    7.3    7.6    7.8    8.0   10.4   16.1   17.2   20.2
          1993    4.7    7.3    8.8   14.2   17.8   23.3   24.2   24.2   24.2
          1994    1.9    2.9    3.5    4.8    7.5   12.4   17.0   21.4   23.5
          1995    2.5    3.1    3.5    3.8    5.1    8.3   11.1   14.6   18.6
          1996    2.5    3.3    4.3    5.5    7.8    8.6   10.6   10.6   11.8
          1997    5.4    8.4   11.0   15.6   16.9   17.5   18.0   19.8   20.7
          1998    1.9    2.3    3.3    4.0    4.9    6.5   10.9   11.6   17.0
          1999    1.9    3.6    4.0    4.6    4.8    4.8  -99.9  -99.9   11.4
          2000    3.3    5.2    6.9    7.7    8.0   14.9   16.5   26.2   28.1
          2001    1.6    2.0    2.2    2.8    3.7    6.7  -99.9  -99.9   23.0
          2002  -99.9  -99.9  -99.9  -99.9  -99.9    9.3    9.3   10.0   15.8
          2014    4.4    5.6    6.2    6.8    9.8   14.0   18.8   20.0   28.8
          2016    2.2    3.6    3.8    4.0    5.4    8.0   10.4   12.8   12.8
          2017    5.0    6.0    6.4    6.8    7.0    9.8   11.6   12.6   14.8
          2018    5.0    6.8    9.4   11.0   14.2   15.0   18.6   19.2   24.2
          2019    3.4    5.2    6.2    7.8    8.6    9.4   12.0   13.4   14.4
          2020    6.6   11.4   15.4   25.8   33.4   34.2   34.4   34.4   34.4
          2021    3.8    5.0    5.8    6.6    7.8   13.8   26.2   39.0   47.6
          2022    5.4    7.4    7.8    8.6   12.8   18.2   30.4   37.2   38.2
          2023    7.6   12.2   15.8   27.2   29.6   33.6   37.0   37.4   37.4
          2024   10.6   16.4   17.2   18.0   18.0   18.0   18.8   23.0   23.0
      -----------------------------------------------------------------------
        # Yrs.     36     36     36     36     36     37     35     35     37
        Annes
          Mean    4.4    6.2    7.1    8.9   10.6   12.7   16.3   19.1   21.9
       Moyenne
     Std. Dev.    2.6    3.5    4.0    5.8    6.6    6.6    6.9    7.9    8.1
    cart-type
         Skew.   1.64   1.32   1.08   1.74   1.93   1.88   1.62   1.26   1.18
   Dissymtrie
      Kurtosis   6.84   4.88   3.71   6.24   7.48   7.29   5.46   4.25   4.96
 
          *-99.9 Indicates Missing Data/Donnes manquantes
 
 Warning: annual maximum amount greater than 100-yr return period amount
 Avertissement : la quantit maximale annuelle excde la quantit
                 pour une priode de retour de 100 ans
          Year/Anne      Duration/Dure        Data/Donnes          100-yr/ans
                1977               5 min                13.7                12.6
                2020               1 h                  33.4                31.2
                2020               2 h                  34.2                33.4
                2021              24 h                  47.6                47.2
                2023              30 min                27.2                27.1
                2023               2 h                  33.6                33.4
 
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Table 2a : Return Period Rainfall Amounts (mm)
           Quantit de pluie (mm) par priode de retour
 
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 Duration/Dure        2        5       10       25       50      100      200   #Years
                  yr/ans   yr/ans   yr/ans   yr/ans   yr/ans   yr/ans   yr/ans   Annes
          5 min      4.0      6.3      7.8      9.7     11.2     12.6     14.0       36
         10 min      5.6      8.7     10.7     13.3     15.2     17.1     18.9       36
         15 min      6.5     10.0     12.3     15.3     17.5     19.6     21.8       36
         30 min      7.9     13.0     16.4     20.7     23.9     27.1     30.2       36
          1 h        9.5     15.3     19.2     24.0     27.6     31.2     34.7       36
          2 h       11.7     17.5     21.3     26.2     29.8     33.4     37.0       37
          6 h       15.2     21.2     25.3     30.3     34.1     37.9     41.6       35
         12 h       17.8     24.7     29.3     35.1     39.4     43.7     48.0       35
         24 h       20.6     27.7     32.4     38.4     42.8     47.2     51.6       37
 
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Table 2b :
 
 Return Period Rainfall Rates (mm/h) - 95% Confidence limits
 Intensit de la pluie (mm/h) par priode de retour - Limites de confiance de 95%
 
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 Duration/Dure        2        5       10       25       50      100      200   #Years
                  yr/ans   yr/ans   yr/ans   yr/ans   yr/ans   yr/ans   yr/ans   Annes
          5 min     47.8     75.5     93.8    116.9    134.1    151.1    168.1       36
                +/-  9.4 +/- 15.8 +/- 21.3 +/- 28.8 +/- 34.4 +/- 40.1 +/- 45.8       36
         10 min     33.6     52.0     64.2     79.6     91.0    102.3    113.6       36
                +/-  6.2 +/- 10.5 +/- 14.2 +/- 19.2 +/- 22.9 +/- 26.7 +/- 30.5       36
         15 min     26.0     40.1     49.4     61.2     69.9     78.6     87.2       36
                +/-  4.8 +/-  8.0 +/- 10.9 +/- 14.7 +/- 17.5 +/- 20.4 +/- 23.3       36
         30 min     15.8     26.1     32.9     41.5     47.8     54.2     60.5       36
                +/-  3.5 +/-  5.9 +/-  7.9 +/- 10.7 +/- 12.8 +/- 14.9 +/- 17.0       36
          1 h        9.5     15.3     19.2     24.0     27.6     31.2     34.7       36
                +/-  2.0 +/-  3.3 +/-  4.5 +/-  6.0 +/-  7.2 +/-  8.4 +/-  9.6       36
          2 h        5.8      8.7     10.7     13.1     14.9     16.7     18.5       37
                +/-  1.0 +/-  1.6 +/-  2.2 +/-  3.0 +/-  3.6 +/-  4.2 +/-  4.8       37
          6 h        2.5      3.5      4.2      5.1      5.7      6.3      6.9       35
                +/-  0.3 +/-  0.6 +/-  0.8 +/-  1.1 +/-  1.3 +/-  1.5 +/-  1.7       35
         12 h        1.5      2.1      2.4      2.9      3.3      3.6      4.0       35
                +/-  0.2 +/-  0.3 +/-  0.5 +/-  0.6 +/-  0.7 +/-  0.9 +/-  1.0       35
         24 h        0.9      1.2      1.4      1.6      1.8      2.0      2.1       37
                +/-  0.1 +/-  0.2 +/-  0.2 +/-  0.3 +/-  0.4 +/-  0.4 +/-  0.5       37
 
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Table 3 : Interpolation Equation / quation d'interpolation: R = A*T^B
 
R = Interpolated Rainfall rate (mm/h)/Intensit interpole de la pluie (mm/h)
RR = Rainfall rate (mm/h) / Intensit de la pluie (mm/h)
 T = Rainfall duration (h) / Dure de la pluie (h)
 
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       Statistics/Statistiques      2      5     10     25     50    100    200
                               yr/ans yr/ans yr/ans yr/ans yr/ans yr/ans yr/ans
      Mean of RR/Moyenne de RR   15.9   24.9   30.9   38.4   44.0   49.6   55.1
    Std. Dev. /cart-type (RR)   16.5   26.0   32.3   40.3   46.1   52.0   57.8
        Std. Error/Erreur-type    2.7    5.4    7.3    9.7   11.5   13.3   15.1
               Coefficient (A)    9.1   13.8   16.8   20.7   23.6   26.4   29.3
         Exponent/Exposant (B) -0.722 -0.752 -0.763 -0.773 -0.778 -0.782 -0.785
 Mean % Error/% erreur moyenne    5.1    7.1    8.0    8.8    9.2    9.5    9.8
