Table 1.

Study sites and catchment characteristics.

Sampling area	A	B	C	D	E	F	G
Catchment size (m2)	51,306,895	68,852,025	120,301,291	45,713,961	20,808,361	26,980,810	67,777,648
Land use (%)
-Residential	31.28	16.02	35.00	17.31	34.95	34.04	0.67
-Urban	38.95	19.49	37.20	27.25	36.69	43.85	1.55
-Green	24.68	48.99	20.90	47.09	20.39	18.62	79.20
-Agriculture	0	7.00	0	0	0	0	0
-Water body	5.08	8.50	6.90	8.35	8.01	3.49	18.58
Sample name
Sample collected from:
-Reservoir	A_reservoir	B_reservoir	C_reservoir	D_reservoir1	E_reservoir1	F_reservoir	G_reservoir
				D_reservoir2	E_reservoir2
				D_reservoir3
-Tributary	A_tributary1	B_tributary1	C_tributary1
	A_tributary2	B_tributary2	C_tributary2
	A_tributary3	B_tributary3	C_tributary3

Note: Sampling area A is located in a high density residential area with several construction activities nearby; sampling area B is situated in an agricultural area with fish farms and farming activities; sampling area C receives runoff from highly urbanized commercial areas (designated as business district); sampling area D is surrounded by green areas and is near to wild life parks; sampling area E is located in a residential area, although there is no direct drain channel to the water bodies; sampling area F is located near an industrial park; and sampling area G is within a protected parkland area and is designated for secondary contact recreational water activities.