Dependent
Variable

Independent
Variable

Regression equation

Slope

R2

  •  

DO mean

BOD mean

DO = 31.93 + 1.551 * BOD

1.551

0.007

  •  

DO mean

COD mean

DO = 303.1 - 66.81 * COD

-66.81

0.834

  •  

DO mean

BODmean,
COD mean

DO = 2.6645816 + .0081708 * BOD + .0021325 * COD

 

.0323

  •  

DO mean

Alkalinity mean

DO = 493  - 33.58 * alkalinity

-33.58

.228

  •  

DO mean

TDS mean

DO = 250.7 + 184.5  *  TDS

184.5

.113

  •  

DO mean

pH mean

DO = 3.757 + 1.718  *  pH

1.718 

.665

  •  

DO mean

Chloride mean

DO = - 112.1 + 74.33  * Chloride

74.33

0.579

  •  

DO mean

Residual Chlorine mean

DO = 0.092 + 0.039 * Residual Chlorine

0.039

0.016

  •  

DO mean

o-Phosphate mean

DO = 9.664 - 1.510 * o- Phosphate

-1.510

0.465

  •  

DO mean

Nitrate mean

DO = 13.60 - 1.171 * Nitrate

- 1.17

.191

  •  

DO mean

Ammonia mean

DO = 0.442 + 0.002 * Ammonia

0.002

.001

  •  

DO mean

TDS mean
Chloride mean

DO = 2.8947197 +   .0006395 * TDS -.0021692 * Chloride

 

0.151

  •  

DO mean

TDS mean Chloride mean, Residual Chlorine mean

DO = 3.2000125+.0003551 * TDS-.0007378 * Chloride - 1.125849 * Residual Chlorine

 

0.2344

  •  

DO mean

TDS mean Chloride mean, Residual Chlorine mean
o-Phosphate mean

DO =   1.8955758 +   .000345 * TDS - .0013377 * Chloride -2.049152 *Residual Chlorine+ .2572442 * o-Phosphate

 

0.4843

  •  

DO mean

TDS mean Chloride mean, Residual Chlorine mean
o-Phosphate mean
 Nitrate mean

DO =   56.332194 +   .0217746 * TDS   -.1663759 * Chloride+ 51.923978 *Residual Chlorine+ .1293998 * o-Phosphate - 6.342301 * Nitrate

 

0.0

  •  

DO mean

TDS mean Chloride mean, Residual Chlorine mean
o-Phosphate mean
 Nitrate mean
Ammonia mean

DO = 8.2230225 - .0023214 * TDS + .0472021 * Chloride -25.00903 * Residual Chlorine + .2979269 * o-Phosphate + 1.4023132 * Nitrate - 44.00537 * Ammonia

 

0.0

  •  

DO mean

Total
hardness mean

DO = 1128 - 190.9 * Total hardness

- 191

0.572

  •  

DO mean

Temporary hardness mean

DO = 1.6116 + .0036 * Temporary hardness

 

.338

  •  

DO mean

Permanent hardness mean

DO = 3.2268 -.0007 * Permanent hardness

 

.016

  •  

DO mean

Calcium hardness mean

DO = 672.9 – 78.98 * Calcium hardness

– 78.98

0.353

  •  

DO mean

Magnesium hardness mean

DO = 455.6 - 111.9 * Magnesium hardness

- 111.9

.554

  •  

DO mean

Temporary hardness mean
Permanent hardness mean

DO = 1.6642151 - .0034803 * Temporary hardness  - .0002226 * Permanent hardness

 

0.338

  •  

DO mean

 Calcium hardness mean
Magnesium hardness mean

DO = .2102607   + .0078471 * Calcium hardness   - .0036364 * Magnesium hardness

 

.7292

  •  

DO mean

Fluoride mean

DO = - 0.046 + 0.422 * Fluoride

0.422

0.357

  •  

DO mean

Iron mean

DO = 1.778 + .416 * Iron

.416

.009

  •  

DO mean

Fluoride mean Iron mean

DO = 4.5251761 - 1.030661 * Fluoride -.0115327 * Iron

 

0.478

Table 5: Regression Analysis of chemical Parameters with DO in Lake’s water Samples of Sagar city (Monsoon 2007 to Pre Monsoon 2011).