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Figure 5 shows cumulative frequencies of hourly precipitation and runoff intensities from the roofs throughout the SCPs which includes snow-free periods with temperatures above and below 0 °C. The plots include all observations (i.e., both with and without precipitation and runoff) and only the upper percentiles are shown. Table 3 shows the precipitation and runoff from percentiles 95, 99, and 100% from Figure 5. As expected, the distributions of intensity frequency are highly dependent on whether air temperatures are below or above the freezing point during SCPs. While only modest amounts of runoffs are generated from the roofs during periods with T < 0 °C, the runoff intensities exceed that of precipitation in periods with T > 0 °C (Figure 5 and Table 3).
Table 3

Precipitation and runoff intensities (mm/h) for frequencies and various periods and situations

SCP (Tair < 0 °C)
SCP (Tair > 0 °C)
Rest of the year
95%99%Max95%99%Max95%99%Max
2009–2014 Precipitation 0.30 1.40 4.30 0.80 2.10 11.50 0.70 2.80 29.70 
GR1 0.00 0.06 0.55 1.12 2.08 5.06 0.45 1.67 19.03 
GR3 0.00 0.12 0.64 1.07 2.01 4.82 0.46 1.74 15.35 
REF 0.00 0.12 1.94 1.39 2.81 6.51 0.71 2.69 25.89 
2014–2020 Precipitation 0.60 1.40 4.20 0.70 2.00 4.10 0.60 2.70 26.20 
GR1 0.06 0.12 1.15 0.97 1.72 3.43 0.39 1.73 17.26 
GR2 0.06 0.12 1.39 0.96 1.76 3.58 0.28 1.67 16.80 
GR3 0.06 0.12 1.07 1.01 1.76 3.35 0.43 1.77 15.34 
SCP (Tair < 0 °C)
SCP (Tair > 0 °C)
Rest of the year
95%99%Max95%99%Max95%99%Max
2009–2014 Precipitation 0.30 1.40 4.30 0.80 2.10 11.50 0.70 2.80 29.70 
GR1 0.00 0.06 0.55 1.12 2.08 5.06 0.45 1.67 19.03 
GR3 0.00 0.12 0.64 1.07 2.01 4.82 0.46 1.74 15.35 
REF 0.00 0.12 1.94 1.39 2.81 6.51 0.71 2.69 25.89 
2014–2020 Precipitation 0.60 1.40 4.20 0.70 2.00 4.10 0.60 2.70 26.20 
GR1 0.06 0.12 1.15 0.97 1.72 3.43 0.39 1.73 17.26 
GR2 0.06 0.12 1.39 0.96 1.76 3.58 0.28 1.67 16.80 
GR3 0.06 0.12 1.07 1.01 1.76 3.35 0.43 1.77 15.34 

Note: Details in tabletop; see Figure 5.

Figure 5

Cumulative frequencies of hourly precipitation and runoff intensities from the roofs for various periods and situations. SCP is the periods from the first snowfall to the last snow had melted in the winter half-year. T > 0 °C includes episodes where the average air temperature is positive. Rest of the year’ is more or less the summer-half-year.

Figure 5

Cumulative frequencies of hourly precipitation and runoff intensities from the roofs for various periods and situations. SCP is the periods from the first snowfall to the last snow had melted in the winter half-year. T > 0 °C includes episodes where the average air temperature is positive. Rest of the year’ is more or less the summer-half-year.

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