1. CONSERVATION, RESTORATION & MANAGEMENT OF LAKES
Jahnavi R, Jyotsna Sripada & Divya P
Vidyaniketan Pre-University College
Ullal Upanagar, Bangalore
December 28th 2006
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2. OBJECTIVE
THE PROJECT MAINLY DEALS WITH CONSERVATION, RESTORATION AND MANAGEMENT OF LAKES.
EMPHASIS ON PROTECTING OUR LAKES
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3. USES OF LAKES : ESSENTIAL FOR HUMAN HABITAT
HOME TO RARE BIRDS, FLORA & FAUNA
USEFUL IN RECHARGING GROUND WATER
VITAL PART OF THE FRESH WATER ECO-SYSTEM
FLOOD CONTROL
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4. CAUSES FOR LAKE DEPLETION:
INADEQUATE RAIN FALL
INDUSTRIAL WASTES
DIGGING OF BOREWELLS
UNPLANNED URBANIZATION
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5. PROJECT STUDIES` Sample analysis of Ullal lake.
Conclusion of a survey conducted in the area.
Interview with an environmentalist
Detailed study of Ulsoor lake .
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6. SAMPLE ANALYSIS OF ULLAL LAKE
PARAMETER
CONCENTRATION
STANDARD VALUE
CONCLUSION pH
7.4
NORMAL
DISSOLVED OXYGEN
6.4 mg/l
9.1 mg/l
BIOLOGICAL OXYGEN DEMAND
1.1mg/l
1 - 2
E.COLI
240 -
CONTAMINATED WITH PATHOGENS
CHLORIDES
25mg/l
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7. INTERACTION WITH PUBLIC
NUMBER OF RESPONDENTS 15
PERIOD OF RESIDENCY
4 TO 20 YEARS
OCCUPATION DETAILS
ORGANISED SECTOR -8
BUSINESS- 2,UNORGANISED- 5
AGE GROUP OF RESPONDENTS
7 TO 60 YEARS
CONSERVATION RESTORATION AND MANAGEMENT OF LAKES
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8. LAKE PROBLEMS EUTROPHICATION – The ageing process
SEDIMENTATION – Soils wash into the lake
EXCESS ALGAE – Microscopic aquatic plants
CONTAMINATION – Pollution from toxic substances
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9. EXCESSIVE WEED GROWTH
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10. DUMPED GARBAGE
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11. CONSTRUCTION MATERIAL
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12. DYING AND DECOMPOSING BLUE GREEN ALGAE BLOOM
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13. BREEDING MOSQUITO LARVAE
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14. DETAILED STUDYOF ULSOOR LAKE
Size: 50 acres
Current problems:
EUTROPHICATION
HYACINTH INFESTED WATER
CONTAMINATED WITH SLIME
UNCHECKED EFFLUENTS
SEWAGE DISCHARGE
UNPLANNED URBANISATION
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15. REMEDIAL MEASURES DE-SILTATION DE-WEEDING
PREVENTION OF SEWAGE/INDUSTRIAL WASTE
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16. EFFECT OF INADEQUATE DISSOLVED OXYGEN
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17. CONSERVATION DEVELOP AQUATIC LIFE PREVENT ENCROACHMENT
CREATING BUFFER ZONES FOR LAKEPROTECTION
LIMITING ANTHROPOGENIC ACTIVITIES
SET UP AN INTERAGENCY REGULATORY BODY
DEVELOPMENT OF WATER QUALITY DATABASE
CONDUCT REGULAR WATER QUALITY MONITORING
INVOLVE INSTITUTIONS AND COLLEGES
INWATER QUALITY MONITORING
CREATE PUBLIC AWARENESS.
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18. IN-LAKE RESTORATION TECHNIQUES
METHOD
ADVANTAGES
DISADVANTAGES
DILUTION
WASHES OUT SURFACE ALGAE
REQUIRES LARGE VOLUME OF WATER
ARTIFICIAL CIRCULATION
PROVIDES AERATION AND OXYGENATION
DOES NOT DECREASE ALGAE BIOMASS
DREDGING
CONTROLS AQUATIC VEGETATION
HIGH COST
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19. AQUATIC PLANT CONTROL TECHNIQUES
METHOD
ADVANTAGES
DRAWBACKS
Manual Methods: (Handpulling, raking and cutting)
Inexpensive. Flexible.
Not practical for large areas.
Weed Rolling:
Rolls plants flat or detaches them from bottom sediment
Easy to operate Can give season-long control.
Good only for limited area around dock.
Herbicides:
Apply chemicals to kill or control plants.
May control macrophyte and algae growth.
Potential toxic effects. Decomposes plant material
Sediment Covers (Bottom barriers)
Nontoxic. Low environmental impact
High cost. Prone to damage, displacement, and plant regrowth
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20. MANAGEMENT Regular water quality monitoring Regular case studies
Involving student associations and authorities
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21. LOST LAKES NAME OF LAKE STATUS NOW Shoolay Lake Football Stadium
Akkithimmanahali Lake
Hockey Stadium
Darmambudi Lake
Kempegowda Bus Stand
Challagatta Lake
Golf Course
Domlur Lake
BDA Layout
Nagashettihali Lake
Space Department
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22. RESIDENTIAL LAYOUT – ONCE KORAMANGALA LAKE
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23. KEMPEGOWDA BUS STATION – ONCE DHARMAMBUDI LAKE
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24. GOLF COURSE- ONCE CHALLAGHATTA LAKE
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25. STADIUM – ONCE SHOOLAY LAKE
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26. CONCLUSION
Unplanned urbanization and growing population have taken their toll on wetlands.
Sewage discharge and industrial effluents are the main sources of pollution.
A collaboration of the society along with the responsible institutions should do the needful in order to do the necessary.
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27. HAD ALL THE LAKES BEEN PROTECTED, BANGALORE WOULD HAVE BEEN
NEXT TO WALES OF U.K.
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28. THANK YOU