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Table 1

Details of study area

Study area properties	Values/Range
Area	270 km²
Altitude	380–590 m
Average annual rainfall (1991–2013)	840 mm
Storm water drain network length	Zone 12–66 km
Storm water drain network length	Zone 13–21 km
Storm water drain width	Major (width > 2 m)
	Minor (2 m < width < 0.45 m)
	Street (width < 0.45 m)
% Pervious area	30^a
% Impervious area	70^a

Study area properties	Values/Range
Area	270 km²
Altitude	380–590 m
Average annual rainfall (1991–2013)	840 mm
Storm water drain network length	Zone 12–66 km
Storm water drain network length	Zone 13–21 km
Storm water drain width	Major (width > 2 m)
	Minor (2 m < width < 0.45 m)
	Street (width < 0.45 m)
% Pervious area	30^a
% Impervious area	70^a

^aApproximately.