SPATIAL ANALYSIS OF

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SPATIAL ANALYSIS OF WATER QUALITY
PARAMETERS ALONG THE PERIPHERAL RIVERS OF DHAKA
, BANGLADESH
PRESENTED BY Sayma Rahman
5 DECEMBER, 2005 CLASS PROJECT GEOG 4510 Theory
of GIS Part I Tennessee Tech University
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INTRODUCTION Problem Statement

• Dhakas water supply
• GW (Ground Water) sources 82
• SW (Surface Water) sources 18
• GW resource rapidly declining.
• Additional 42 demand projected in next 20 years
• Surface water highly polluted.
• Spatial assessment of surface WQ needed to
  relocate water intake point for optimal
  conjunctive use.

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OBJECTIVES

• Spatially demonstrate the existing level of WQ
  parameters along the rivers of Dhaka.
• Qualitatively identify the optimal relocated
  intake point.
• Develop geographic information base on river WQ
  for environmental modeling and planning.

METHODOLOGY

• Develop a GIS based map of the study area
• showing water quality sampling points
• 2. Present spatial information on current WQ
• 3. Compare water quality parameters with
  Bangladesh Standards for surface water.
• 4. Identify qualitatively a suitable location
  for abstraction of surface water using GIS.

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STUDY AREA

• Main rivers around Dhaka
• Sampling Routes
• i. Tongi canal-Balu river
• ii. Tongi canal-Turag river-
• Buriganga- Dhaleshwari
• iii. Shitalakhya river

Dhaka City
COLLECTED DATA

• GPS data of the
• sampling locations
• WQ parameters
• ? DO ? NH3 N
• ? BOD ? NO3-N
• ? COD ? PO4

Study area Peripheral Rivers of Dhaka City
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RESULT and ANALYSIS
Dhaka City
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RESULT ANALYSIS ( contd.)
DO
BOD
COD
Upstream Lakhya Ideal for Relocation of Intake
Point
PO4-P
NH3-N
NO3-N
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WQ PROFILE ALONG LAKHYA
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WQ PROFILE ALONG LAKHYA
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DELIVERABLE OF THE PROJECT
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CONCLUSION

• The peripheral rivers currently not suitable as a
  reliable source for water supply for Dhaka City
  in the dry season.
• GIS analysis identified an optimal relocated
  point for future water intake
• A suggested approach
• Use River water during the rainy monsoon
  season (when the water quality is good due to
  dilution effects)
• and ground water during dry (winter) months.
• Using GIS, the work laid the foundations for city
  planners and designers to
• Choose a proper water quality model
• Formulate strategies for water abstraction and
  water supply for a growing city.

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ACKNOWLEDGEMENT Data Institute of
Water Modeling, Water Resources Planning Division
, Dhaka, Bangladesh.

THANK YOU