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The rainfall amount was recorded at an interval of 10 min by an automated weather monitoring system (DAVIS weather station, Hayward, CA, USA) installed at PKUSZ. A plastic open tray was used to collect the rainwater. Before its use, the tray was washed with deionized water. The tray was placed on the roofs and a water quality sample was collected from the tray at the end of the rainfall event. Twenty-five rainfall events were monitored and the rainwater quality samples were collected (Table 1). The antecedent dry period (ADP), rainfall amount and rainfall duration ranged from 0.17 days to 12.25 days, 1.8 mm to76.8 mm and 0.33 h to 11.02 h, respectively.

Table 1

Observed rainfall data

DateADP (day)Rainfall amount (mm)Rainfall duration (h)
11 June 2011 1.8 
11 June 2011 0.42 76.7 6.2 
12 June 2011 0.25 18.6 4.3 
10 July 2011 7.8 4.8 2.17 
11 July 2011 51.6 1.2 
19 July 2011 0.5 4.6 
28 July 2011 11.4 0.6 
29 July 2011 0.58 4.1 0.5 
9 August 2011 0.42 61.8 5.2 
9 August 2011 0.33 56.4 0.8 
17 August 2011 2.21 5.3 0.33 
1 September 2011 12.25 1.8 0.5 
2 September 2011 0.17 15 0.5 
8 March 2012 0.63 3.6 5.93 
5 April 2012 5.24 18.6 4.5 
16 April 2012 2.89 1.3 2.08 
16 April 2012 0.12 23.8 2.62 
18 April 2012 0.91 2.7 0.83 
19 April 2012 0.84 60.8 7.25 
20 April 2012 0.66 52.3 11.02 
25 April 2012 1.72 1.6 1.67 
27 April 2012 1.72 76.8 8.5 
4 May 2012 3.28 10.8 0.33 
13 May 2012 2.12 2.8 0.17 
13 May 2012 0.22 15.6 
DateADP (day)Rainfall amount (mm)Rainfall duration (h)
11 June 2011 1.8 
11 June 2011 0.42 76.7 6.2 
12 June 2011 0.25 18.6 4.3 
10 July 2011 7.8 4.8 2.17 
11 July 2011 51.6 1.2 
19 July 2011 0.5 4.6 
28 July 2011 11.4 0.6 
29 July 2011 0.58 4.1 0.5 
9 August 2011 0.42 61.8 5.2 
9 August 2011 0.33 56.4 0.8 
17 August 2011 2.21 5.3 0.33 
1 September 2011 12.25 1.8 0.5 
2 September 2011 0.17 15 0.5 
8 March 2012 0.63 3.6 5.93 
5 April 2012 5.24 18.6 4.5 
16 April 2012 2.89 1.3 2.08 
16 April 2012 0.12 23.8 2.62 
18 April 2012 0.91 2.7 0.83 
19 April 2012 0.84 60.8 7.25 
20 April 2012 0.66 52.3 11.02 
25 April 2012 1.72 1.6 1.67 
27 April 2012 1.72 76.8 8.5 
4 May 2012 3.28 10.8 0.33 
13 May 2012 2.12 2.8 0.17 
13 May 2012 0.22 15.6 

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