investigations in this respect, may provide an 
empirical relation between the light radiance 
and the depth of water. 
Further Scope for Study: 
The behaviour of light at higher turbidity values 
has not been studied. A further study on waters 
at higher turbidity values in the laboratory as 
well as in the field is warranted to see if the 
reflectance curve either flattens or decreases as 
turbidity increases. Also the Sacchi depth and 
extinction depth studies can be made with different 
coloured discs for better definition of the turbi- 
dity. 
Further laboratory analysis of the water samples as 
to the individual pollutants present gives informa- 
tion on the behaviour of light with different types 
of pollution. 
À study of the nature could establish a procedure for 
effective pollution monitoring and helps to take 
effective measures to prevent hazardous effects of 
pollution on humanbeing, plants and acquatic life. 
The water bodies selected being small the M28 data 
obtained is not highly reliable. If a large water 
body like a tank or river is taken for correlation 
of Scanner data with turbidity levels, more reliable 
information can be obtained.