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Duration curves constructed with monthly runoff and precipitation in different periods in the WRB can visualize the impacts of rainfall pattern, catchment size, land use, and river engineering through the change in duration curves (Figure 10 and Table 5). The change in monthly runoff declined more than precipitation at various frequencies in different periods in the WRB.
Table 5

Characteristics of monthly runoff and precipitation from Figure 10 in different periods in the WRB

  Exceedance probabilities
ElementsCharacteristic values5%50%95%
Runoff R(1960–1971) 18.37 mm 4.54 mm 1.19 mm 
R(1972–1994) 15.83 mm 3.15 mm 0.69 mm 
R(1995–2010) 8.62 mm 2.03 mm 0.55 mm 
Change ratio (1972–1994 versus 1960–1971) −13.83% −30.62% −42.02% 
Change ratio (1995–2010 versus 1960–1971) −53.08% −55.29% −53.78% 
Precipitation P(1960–1971) 145.39 mm 40.95 mm 1.01 mm 
P(1972–1994) 132.34 mm 30.63 mm 1.30 mm 
P(1995–2010) 125.57 mm 27.14 mm 1.68 mm 
Change ratio (1972–1994 versus 1960–1971) −8.98% −25.20% 28.71% 
Change ratio (1995–2010 versus 1960–1971) −13.63% −33.72% 66.34% 
  Exceedance probabilities
ElementsCharacteristic values5%50%95%
Runoff R(1960–1971) 18.37 mm 4.54 mm 1.19 mm 
R(1972–1994) 15.83 mm 3.15 mm 0.69 mm 
R(1995–2010) 8.62 mm 2.03 mm 0.55 mm 
Change ratio (1972–1994 versus 1960–1971) −13.83% −30.62% −42.02% 
Change ratio (1995–2010 versus 1960–1971) −53.08% −55.29% −53.78% 
Precipitation P(1960–1971) 145.39 mm 40.95 mm 1.01 mm 
P(1972–1994) 132.34 mm 30.63 mm 1.30 mm 
P(1995–2010) 125.57 mm 27.14 mm 1.68 mm 
Change ratio (1972–1994 versus 1960–1971) −8.98% −25.20% 28.71% 
Change ratio (1995–2010 versus 1960–1971) −13.63% −33.72% 66.34% 
Figure 10

Duration curves of monthly runoff and precipitation in different periods in the WRB.

Figure 10

Duration curves of monthly runoff and precipitation in different periods in the WRB.

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