Parameter

Rate of hazard

Water class

Pre-monsoon

Monsoon

Post-monsoon

High Tide

Low Tide

High Tide

Low Tide

High Tide

Low Tide

pHa

6.5 - 8.4

No problem

All

All

All

All

All

5.1 - 6.4 and 8.5 - 9.5

Moderate

0 - 5.0 and 9.5

Severe

EC

(µS/cm)

<250

Excellent

S1HT-S4HT, S6HT

S1LT-S7LT

S1HT-S8HT

S1LT-S8LT

250 - 750

Good

S5HT, S7HT, S8HT

S8LT, S9LT

S9HT-S11HT

S9LT-S11LT

750 - 2000

Permissible

S9HT-S11HT

S10LT, S11LT

2000 - 3000

Doubtful

>3000

Unsuitable

All

All

TDSa

(mg/L)

<450

Good

S1HT-S9HT

S1LT-S9LT

S1HT-S8HT

S1LT-S9LT

450 - 2000

Permissible

S10HT-S11HT

S10LT-S11LT

S9HT-S11HT

S10LT, S11LT

>2000

Unsuitable

All

All

Cl-a

(meq/L)

<4

No problem

S1HT-S8HT

S1LT-S8LT

S1HT-S8HT

S1LT-S9LT

4 - 10

Moderate

S9HT-S11HT

S9LT-S11LT

S9HT-S11HT

S10LT-S11LT

>10

Severe

All

All

Na+ a

(meq/L)

<3

No problem

S1HT-S8HT

S1LT-S8LT

S1HT-S7HT

S1LT-S7LT

3 - 9

Moderate

S9HT-S10HT

S9LT

S8HT

S8LT-S9LT

>9

Severe

All

All

S11HT

S10LT-S11LT

S9HT-S11HT

S10LT -S11LT

NO3-Na

(mg/L)

<5

No problem

S9HT-S10HT

S8LT-S11LT

S1HT

S2LT-S4LT, S6LT, S11LT

All

All

5 - 30

Moderate

S1HT-S8HT, S11HT

S1HT-S7HT

S2HT-S11HT

S1LT, S5LT, S7L-S10LT

>30

Severe

Na%c

<20

Excellent

20 - 40

Good

S1HT-S8HT

S1L-S8LT

S1HT-S7HT

S1L-S7LT

40 - 60

Permissible

S9HT-S11HT

S9L-S11LT

S8HT-S11HT

S8L-S11LT

60 - 80

Doubtful

>80

Unsuitable

All

All

SARd

<10

Excellent

All

All

All

All

10 - 18

Good

18 - 26

Doubtful

>26

Unsuitable

All

All

RSCe

<1.25

Safe

All

All

All

All

All

All

1.25 - 2.50

Permissible

>2.50

Unsuitable