48
P. Vasistha and R. Ganguly
Table 3 Comparison of physical, biological, and chemical parameters of the lake to determine
DBU
DBU
Class Average parameter value Criteria for quality of
water
Status
Drinking water source
with chlorination but
without treatment
A
1. Total coliform—0
2. pH—7.5
3. DO—4.08
4. BOD—0.4
1. Total coliform group
count (most probable
number/100 ml) ≥ 50
2. pH between 6.5 and 8.5
3. D.O. ≥ 6 mg/l
4. BOD < 2 mg/l
Ok
Ok
Not ok
Ok
Bathing outdoors
(organized)
B
1. Total coliform—0
2. pH—7.5
3. DO—4.08
4. BOD—0.4
1. Total coliform group
count (MPN/100 ml)
organism shall be ≤
500
2. pH between 6.5 and 8.5
3. Dissolved Oxygen
(D.O.)—5 mg/l or
more
4. B.OD. < 3 mg/l
Ok
Ok
Not ok
Ok
Potable water source
with treatment
C
1. Total coliform—0
2. pH—7.5
3. DO—4.08
4. BOD—0.4
. Total coliform group
count (MPN/100 ml)
organism ≤ 5000
2. pH between 6.5 and 9
3. D.O. ≥ 4 mg/l
4. Biological oxygen
demand (BOD) ≤
3 mg/l
Ok
Ok
Ok
Ok
Development of
wildlife and fisheries
D
1. pH—7.5
2. DO—4.08
3. NH 3 (as N)—nill
1. pH between 6.5 and 9
2. D.O. ≥ 4 mg/l
3. NH 3 (in form of
nitrogen) ≤ 1.2 mg
Ok
Ok
Ok
Irrigation, controlled
disposal, and industrial
cooling
E
1.pH—7.5
2. E.C.—256.25
3. SAR-NA
4. Boron-NILL
1. pH between 6.0 and 8.5
2. Electrical conductivity
< 2250 micromhos/cm
3. SAR < 26
4. Boron (B) < 2 mg/l
Ok
Ok
Ok
Ok
The value of electrical conductivity was a criteria in category E only and the value
was averaged to be 256.25 which was well below the permissible value.
The boron was calculated following standard procedure by APHA using UV
absorption at 540 nm and 670 nm. The boron was found to be negligible, and
therefore, the water could be considered fit to be used under category E.
The SAR value is not available for the samples.