threats & remedies · threats & remedies for urban wetlands manubhatnagarmanu bhatnagar pr....
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THREATS & REMEDIESFOR
URBAN WETLANDS
MANU BHATNAGARMANU BHATNAGARPr. Director
Natural Heritage DivisionI N T A C HI N T A C H
71,Lodhi Estate, New Delhi – 110003
Phone: 24641304, 24632267, 24632269, 24631818
Fax: 24611290
Email: [email protected], [email protected]
Website: www.intach.org
Urbanization ImpactsUrbanization Impacts
• Colonization Of Water Sheds• Decline Of The Water TableDecline Of The Water Table• Interception Of Surface InflowsH F L d• Hunger For Land
• Engineering & Commercial Approach To Lake Management
Threats To LakesThreats To LakesDUE TO URBANIZATION FLOWS FROM CATCHMENTS TO WATERBODIES ARE INTERRUPTEDIN YEARS OF POOR RAINFALL THE WATERBODIES DRY OUT QUICKLYMOST RIVERFED WATERBODIES ARE DISCONNECTED FROM THE RIVER BECAUSE OF INTERVENING EMBANKMENTSOF INTERVENING EMBANKMENTSSILTATION OF WATERBODIES SEWAGE INFLOW LEADING TO EUTROPHICATION OF WATERBODIESSOLID WASTE DISPOSAL, RELIGIOUS OFFERINGS DISPOSALSOLID WASTE DISPOSAL, RELIGIOUS OFFERINGS DISPOSALWATERBODIES EASY TARGET FOR RECLAMATIONRITUAL BATHINGDECISION MAKERS’ ORIENTATION INADEQUATE LEGISLATIVE FRAMEWORK
FUNCTIONS OF LAKESFUNCTIONS OF LAKES• Dispersed aquifer recharge structures for enriching the local ground
water regime ‐ Enable sustained tube well operations in the local area
• Habitats for aquatic and avian bio‐diversity • Water Purification• Carbon sinks• Food ResourceFood Resource• Substantially add to the visual attraction of the area• Cool the micro‐climate
Off ti l ibiliti• Offer recreational possibilities• Increase soil moisture to support enhanced vegetation growth in
the localized area
Naini Lake 1850
SOI MAP OF 1936
1883 Gazetteer : Spread 22 Sq.Km.
Najafgarh Jheel – 1995 Flood ‐7 Sq. Km. Spread
Satellite Image of Bhalaswa LakeBhalaswa
Bhalaswa Lake Sant Nagar
Bhalaswa Lake
Sant Nagar Yamuna
Mukandpur
g
Mukandpur
g
Jahangirpuri
Jaroda MajraBurari
Jahangirpuri
Jaroda MajraBurari
Wazirabad
D M kh j N
Wazirabad
D M kh j N
-Oxbow lake on floodplains - Area within embankments 47 ha
Coronation Memorial
Dr Mukherjee NagarCoronation Memorial
Dr Mukherjee Nagar
p- Lake isolated from river by RME - North arm of Lake now Landfill Site
High nutrient load due to horse/cow dung dumping along Bhalaswa Dairy -West
Eutrophication of Lake during summers – Water Hyacinth blooms
Cochin Tidal Wetland
Locaches
HAUZ KHAS
Urbanization of Catchment Characteristics
1936 : Catchment Area (10 2001 : Catchment Area Tapped1936 : Catchment Area (10
Sq.Km) Natural With Three
SW Channels
2001 : Catchment Area Tapped
(1.75 Sq.Km)
22
• Water BalanceWater Balance• Water Quality
h C h• The Catchment• The Shoreline
HAUZ KHAS
ExistingSpilloverPipeHauz
i l h
•St W t F 175 H C t h t
EXISTINGPIPELINE
Chlorinator(Optional)
Operational Scheme
•Storm Water From 175 Ha Catchment
•Treated Effluent From Vasant Kunj
STPIndian Institute Of Technology
DiversionChamber
Rose Garden
DiversionChamber
(Optional)
I.I.T.
•Directed to Hauz Through Series of 5
Check Dams in Sanjay Van
•From Last Check Dam 3 Km Pipeline
Katwaria Sarai
Katwaria SaraiJ.N.U.
p
(600 mm Dia. PSC ) Laid in SW Nala
To Hauz
•G it Fl E d H N
SANJAY VANReserved Forest
4
5
PIPE LAID ON BEDOF SW CHANNEL
AQUATIC PLANTLAGOON
AQUATIC PLANTLAGOON
Sanjay Van •Gravity Flow Ensured Hence-No
Energy Consumption.N
12
3
CHECK DAMPIPE
AQUATIC PLANTLAGOON
Sanjay Van
24
Metres 800 600 400 200 0
SOI MAP - 1981
STP Vasant Kunj STP
STP Effluent Upgraded Using Duck Weed Aquatic PlantUsing Duck Weed Aquatic Plant
1 D k W d N 2 D k W d I t d d I Ch k D1.Duck Weed Nursery 2.Duck Weed Introduced In Check Dam
254.Duck Weed Carpet in Check Dam3.Duck Weed Growth
27
28
BIOREMEDIATION USING ANAEROBIC & FACULTATIVE BACTERIA STRAINSBoD Reduced from 18 mg/l to 10 mg/lBottom DO Increased from 1.5 mg/l to 5 mg/l
Day I Day VDay V
IMPROVEMENT THROUGH BIOREMEDIATION
Day XV Day XXV
Satellite Image of Bhalaswa Lake-Issues
• Wastewater Inflow• Enriched Soil Deposits
Shallowing• Eutrophication• Inadequate Water
Cross-Sections @50 m
Existing Profile & Bathmetry Map
W
ES
N
Excavation Details
0.10 M EXCAVATION
RING R
BURARI >>
0 40 MCM f E i 204 lN
S E
W0.10 M EXCAVATION0.25 M EXCAVATION0.50 M EXCAVATION1.0 M-1.20 M EXCAVATION
•0.40 MCM of Excavation to 204 mamsl •Disposal on west bank area•Desiltation to be carried out April - June
THE EQUATION FOR WATER BALANCETHE EQUATION FOR WATER BALANCE
Available Water + Surface Inflow + Sub‐surfaceAvailable Water + Surface Inflow + Sub surface Inflow + Direct Rainfall – Evaporation Losses –Percolation Losses – Overflow – Outflow =Percolation Losses Overflow Outflow = Water Volume In The Lake
HYDROLOGICAL MODEL FOR BHALASWA LAKE - MODIFIED CONDITION
M hNo.
f
AvgMonthly
SurfaceArea
Evaporation Rate[M
[-]Evaporatio
V l
Percolation Rate[M
[-]PercolationV l
[+]Direct RainF ll
TreatedWater
[+]TreatedWater
FixedVolumeC i
WaterVolume at Spillover
V lMonths ofDays
MonthlyRainfall[in mm]
Area[Sq.Mts]
[MetreColumnPer Day]
n Volume[CM/Month]
[MetreColumnPer Day]
Volume[CM/Month]
Fall[CM/Month]
WaterInflow[CM/Day]
WaterInflow[MCM/Month]
Capacityof Hauz[CM]
e atEnd ofMonth[CM]
Volume[CM]
July 31 191.6 404682 0.005 62726 0.005 62725.71 77537.0712 1550 48050 500000 500136 136
August 31 197 4 404682 0 004 50181 0 005 62725 71 79884 2268 1100 34100 500000 501078 1078August 31 197.4 404682 0.004 50181 0.005 62725.71 79884.2268 1100 34100 500000 501078 1078
September 30 105.3 404682 0.004 48562 0.005 60702.3 42613.0146 2250 67500 500000 500849 849
October 31 19.3 404682 0.004 50181 0.005 62725.71 7810.3626 3400 105400 500000 500304 304
November 30 2.8 404682 0.003 36421 0.005 60702.3 1133.1096 3200 96000 500000 500009 9r
December 31 4.3 404682 0.003 37635 0.005 62725.71 1740.1326 3200 99200 500000 500579 579
January 31 14.5 404682 0.002 25090 0.005 62725.71 5867.889 2650 82150 500000 500202 202
February 29 13.2 404682 0.002 23472 0.005 58678.89 5341.8024 2650 76850 500000 500041 41
March 31 9.9 404682 0.006 75271 0.005 62725.71 4006.3518 4350 134850 500000 500860 860
April 30 5.5 404682 0.009 109264 0.005 60702.3 2225.751 5600 168000 500000 500259 259
May 31 9.2 404682 0.011 137997 0.005 62725.71 3723.0744 6400 198400 500000 501401 1401
June 30 38.8 404682 0.01 121405 0.005 60702.3 15701.6616 5550 166500 500000 500095 95
N [ ] d ddi i [ ] d lNote : [+] denotes additions, [-] denotes lossesTotal Design 5813
Volume: 6500 CUM/Day( 6.5 MLD)
Note : 6.5 MLD peak requirement during summers rounded of to 7.0 MLD
Proposed Modified Profile
44454647 34353637383940414243 17181920212223242526272829303233 31
A
12345678910
11121314151648495051525354555657585960616263646566676869707172737475767778798081828384
204.00
204.25
204.00204.25
204.50
BED LEVEL- 204.00
100
110 0
12 00
1300
204.50
204.25
203.75
204.00 BED LEVEL- 204.00
1400
1500
204.75
205.00
204.75204.75
205.00
205.00
204.75
204.25
2 04 .5 0
204.50
204.75
204.50204.25
B C
D E
F G H
I J K
1593.157
204.25 204.50
204.75205.50
204.50
20M
20M
New Embankment Crest at 206.5 Level
Area West of Embankment to be Filled with Excavated Soil upto 206.5 Level
New Embankment
0800
0900
0
Existing Embankment to be raised to 206.5 Level
204.75
204.75
K L M N
O P
Q R
S T
New Embankment Crest at 206.5 Level
BED LEVEL- 204.00
0700
50
206.00
207.00
03
0400
0500
0600
204.75
204.75
205.00
204.75 204.50 204.25 204.00
203.75
204.50
ISLAN
D
BED LEVEL- 204.00
BED LEVEL- 204.00
Crest at 206.5 Level
U V W
X Y Z AA AB
20M
20M
0000
0100
0200
300
205.75
BED LEVEL- 204.00
☺
W
ES
N 40 Ha Waterspread0.5 MCM Storage Volume at FSL
ES
Proposed Plan 205.00
204.75204.75
205.00
204.25
204 .5 0
204.50
204.50
204.25
203.75
204.00
204.00
204.25
204.00204.25
204.50204.25 204.50
BH
ALASW
AD
AIR
Y
A B C
D E F G
12345678910111213141516171819202122232425262728293032333435363738394041424344454647484950515253 3154555657585960616263646566676869707172737475767778798081828384
1
New Embankment Crest at 206.5 Level
Pipe for Transfer of N h
20M
20M
0
0600
0700
0800
0900
1000
1100
1200
1300
1400
1500
204.75
204.75
204.75
205.00
204.75
204.50
204.75205.50
206.00
207.00
204.75
204.75
205.00
204.75 204.50 204.25 204.00
204.50
204.75
204.50204.25
G H
I J K L M
N O
P Q
593. 157
ISLAND
New Embankment Existing Embankment to
BED LEVEL- 204.00
BED LEVEL- 204.00
BED LEVEL- 204.00
BED LEVEL- 204.00
BED LEVEL- 204.00
7.5 MLD STPALTERNATE LOCATION (2)
Northern Water to South End of Lake
Spillway Overflow Structure to be Renovated
0000
0100
0300
0400
0500
205.75
203.75
20
20M
R S
T U V W
X Y Z AA A
Crest at 206.5 Level
Existing Embankment to be raised to 206.5 Level
7.5 MLD STP OVER SUPPLEMNTARY DRAIN ALTERNATE LOCATION (1)(INFLUENT UPLIFTED FROM DRAIN)
Battery of Floating Fountains (22 no.) Floating Fountains 1 no.
at Deepest Location
☺
W
ES
N
0M
AB
•Pre- Treatment in Drain•FAB STP of 7.0 MLD Capacity x 4000 sq.m. area•10 HP x 22 No. Vertical Aerators•30 HPx 1 No. Vertical Aerator at Deepest Point•Circulation of Water 1 MGD north to south end•Bio-remediation in situ•5 lakh carp fish to reduce algae and detritus•Diversion of non-point inflows•Burari Creek waters
EVERY VITITED LAKE HAS TO HAVE A SITE SPECIFIC SOLUTIONSITE SPECIFIC SOLUTION
SOLUTION CAN BE A COMBO OF DIFFERENT INNOVATIONSINNOVATIONS
SOLUTIONS NEED TO ENCOMPASS LEGAL, INSTITUTIONAL, PUBLIC INVOLVEMENT FOR SUSTAINING THE TECHNICAL SUCCESS