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RC is calculated for the baseline and post-change periods, respectively, for each catchment. Table 3 summarizes the statistics of RC for all six catchments. For DPL, CTG, XX and HB catchments, RC regularly oscillated with the lowest value in the 1990s, indicating the least runoff generation in unit precipitation during that period. For the XIN catchment, RC increased slightly in the 1980s in comparison with the baseline period, then decreased in the following two decades (1990s and 2000s). RC in HC catchment showed unique variations with consistently higher values in the whole post-change periods than in the baseline period.

Table 3

RCs of all catchments in different periods

CatchmentBaseline period1980s (1980–1989)1990s (1990–1999)2000s (2000–2010)
DPL (1964–1989) 0.36 – 0.31 0.38 
CTG (1964–1989) 0.35 – 0.30 0.34 
XIN (1967–1976) 0.45 0.47 0.38 0.34 
HC (1964–1979) 0.33 0.42 0.38 0.39 
XX (1964–1973) 0.34 0.38 0.32 0.36 
HB (1964–1973) 0.32 0.35 0.30 0.36 
CatchmentBaseline period1980s (1980–1989)1990s (1990–1999)2000s (2000–2010)
DPL (1964–1989) 0.36 – 0.31 0.38 
CTG (1964–1989) 0.35 – 0.30 0.34 
XIN (1967–1976) 0.45 0.47 0.38 0.34 
HC (1964–1979) 0.33 0.42 0.38 0.39 
XX (1964–1973) 0.34 0.38 0.32 0.36 
HB (1964–1973) 0.32 0.35 0.30 0.36 

Numbers in brackets denote the baseline period of each catchment.

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