Table 2.

Mean SPM concentrations in different zones (see Fig. 1) of Vembanad lake in 2020.

Zone	Mean SPM (mg/l)						% Decrease (pre- and during lockdown)
	Pre-lockdown			During lockdown
	28th February 2020	15th March 2020	Average	31st March 2020	16th April 2020	Average
A	20.2	18.9	19.5	17.2	23.0	20.1	−3.0
B	20.4	20.4	20.4	14.4	18.9	16.7	18.3
C	19.6	15.9	17.8	11.5	17.4	14.4	18.8
D	17.4	13.4	15.4	10.6	16.9	13.7	11.0
E	20.0	15.5	17.8	10.5	12.1	11.3	36.4
F	16.2	11.7	13.9	10.4	11.9	11.1	20.1
G	15.2	11.7	13.4	11.5	12.0	11.8	12.4
H	16.4	11.3	13.9	10.2	10.0	10.1	27.4
I	16.8	11.8	14.3	11.6	11.6	11.6	18.9
J	16.4	13.8	15.1	11.5	9.4	10.4	30.8
K	16.1	10.7	13.4	11.5	10.6	11.0	17.6
L	16.8	14.0	15.4	14.2	14.3	14.2	7.5
M	15.6	15.0	15.3	15.9	9.8	12.8	16.1
N	16.7	11.6	14.1	13.1	9.3	11.2	20.9
O	17.0	14.2	15.6	16.2	12.3	14.3	8.4
P	13.0	14.0	13.5	14.1	8.4	11.2	16.8
Q	13.5	12.3	12.9	14.0	8.6	11.3	12.5
R	13.7	12.9	13.3	14.5	11.6	13.1	1.9
S	12.2	15.9	14.0	15.9	9.9	12.9	8.2
T	12.0	15.1	13.5	18.1	11.6	14.9	−10.3
All zones	15.8	13.1	14.4	12.7	11.6	12.1	15.9