Water quality mapping for solapur district using gis

Prepared by
Prashant Adsul
M. Tech. First Year (113184002)

ES 680
GIS for Environmental Planning and Management

Under the guidance of
Prof. A. K. Dikshit
CESE, IITB

Outline of Presentation

Study Area
Scope and Objective
Water Quality Index (WQI)
GIS Application
Output

June 8, 2012 Water Quality Mapping for Solapur District using GIS Prashant Adsul, CESE IITB 2

Scope and Objective
 To study ground water quality of Solapur district
using GIS software
 To create Water Quality Index (WQI)
 Generate Ground Water Quality Map based on
the WQI


Study Area
Geographically Solapur is located between
17.10 to 18.32 degrees north latitude and
74.42 to 76.15 degrees east longitude. The
district is situated on the south east fringe
of Maharashtra State.

The district in general has flat terrain

Area = 14844.6 sq.kms
338.8 sq.kms is Urban area
14505.8 sq.kms is Rural area

Tehsils: 11


Data for Analysis
 Three Years (Years 2007-2008-2009) ground water Quality date used calculation of
WQI
 Data was downloaded from MPCB website


Methodology for Data Interpretation

Each of the groundwater samples were analyzed for various parameters such as
pH, total hardness, calcium, magnesium, chloride, TDS, fluoride, nitrate, sulphate,
manganese and total alkalinity

Computing WQI of Groundwater, three steps:

Data Source: MPCB website (2007-2008-2009)

(Ramakrishnaiah et al, 2009)

Method for Calculation of Water Quality Index
for Ground Water
Step I
Each of the selected parameters has been assigned a weight (wi) according to its
relative importance in the overall quality of water for drinking purposes.
The maximum weight of 5 has been assigned to the parameter nitrate due to its major
importance in water quality assessment. Magnesium which is given the minimum
weight of 2 as magnesium by itself may not be harmful
Step II
The relative weight (Wi) is computed


for Ground Water


for Ground Water
Step III

A quality rating scale (qi) for each parameter is assigned

qi = (Ci/ Si) x 100

where qi is the quality rating,
Ci is the concentration of each chemical parameter in each water sample in mg/L,
and Si is the Indian drinking water standard for each chemical parameter in mg/L
according to the guidelines of the BIS 10500, (2004-2005


for Ground Water

SIi is the subindex of ith parameter
qi is the rating based on concentration of ith parameter
n is the number of parameters


Water quality classification based on WQI value

All WQI calculations are performed in Excel


Steps in GIS Project
Base Map of Solapur

Georeferencing and Rectification

Shapefile Creation-Polygon

Digitization of Map

Attribute Data Entry

Set Layer Property

Spatial Query

Analysis

Result Determination based on conditions


Geo-referencing


Base Map of Solapur

Source: Google Maps


Checking RMS Error

Geo-referencing


Creating Shapefile


Creating Shapefile in ArcCatalog


Digitization of Map


Digitization of Map in ArcMap


Digitization: Tehsil


Attribute Data : Joining Excel Data


Attribute Table: Water


Set Layer Properties


Label Expression (Tehsil Layer)


Spatial Query


Tehsils< Nitrate 45 mg/l


Tehsils> Nitrate 100 mg/l


Output


Tehsils: Nitrate Conc. Map


Nitrate Conc. : Bar Chart


Pie Charts: WQI, Nitrate and pH


Bar Charts: WQI, Nitrate and pH


Total Hardness mg/l


Tehsils: Excellent Water Quality Based on
WQI


Output for Printing and
Publications Purpose


Tehsils: Nitrate Conc. Map


Tehsils: Water Quality Map


Create Reports


Conclusion

Sangola Indicates Excellent Water Quality. Water Quality Index is affected by
Nitrate conc. Agricultural runoff is the major contributor to the nitrate
contamination in ground water.


References
1. Ramakrishnaiah, C.R., C. Sadashivalah and G. Ranganna,2009. “Assessment of water
quality index for the groundwater in Tumkur Taluk, Karnataka State”, Indian J. Chem.,
6: 523-530

2. MPCB report on water quality report for Maharashtra State

3. Yisa J. and Jimoh T. “Analytical Studies on Water Quality Index of River Landzu”,2010
American Journal of Applied Sciences 7 (4): 453-458

4. Lecture Notes for Course ES 680 by Prof. A.K. Dikshit, CESE IITB Mumbai

5. Google Maps


Acknowledgement

Prof. A.K. Dikshit

Mr. Nishit Aman
Ms. Arleen Kaur
ES 680 GIS Group


Water quality mapping for solapur district using gis

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