pl-6 jayesh ranjan

8/13/2019 PL-6 Jayesh Ranjan

http://slidepdf.com/reader/full/pl-6-jayesh-ranjan 1/35

CONSERVATION OF URBAN LAKES IN

HYDERABAD METROPOLITAN AREA

Jayesh Ranjan IASVice-Chairman, HUDA



Hyderabad - Profile

Located between 17°21' - 17°71' NLatitude and between 78° 21' -

78°76'E Longitude with an average

altitude of 560 m above MSL.

Hyderabad Metropolitan Area comprises 8500 sq. km.

Topography – Rocky, undulating with gentle slopes,red gravely soils

Tropical climate with annual rainfall of 800 mm (under

semi-arid)

Decadal growth rate - 37 %

Ranked 6th in population among the metropolitancities in India.



HYDERABAD URBAN DEVELOPMENT AUTHORITY

The Authority is constituted

in1975 under Urban areas(development) act 1975.

HUDA is a statutory Planning

Authority to develop MasterPlan for planned developmentand controlled growth ofurban areas.

To plan for a sustainable development of Hyderabad urbanagglomeration.

To develop policy framework, zoning regulations and land use

plan.

To plan and implement infrastructure facilities like roadnetwork and overall transportation plan.

To plan for sustainable environmental management.



LAKES OF HYDERABAD

About 400 big & small

lakes in HUDA area.

169 lakes notified by

HUDA for protection

and conservation of

water spread area withno activity in 30 m

buffer around the

water bodies.



INDIA

Andhra Pradesh

URBAN LAKES – DRAINAGE MAP

India

Hyderabad Urban Development Authority



Hydrological regime & role of urban lakes

Urbanization has led toloss of water bodiesresulting in increased

runoff

Lakes contribute

significant additionalrecharge to the groundwater regime due toinfiltration

Over-exploitation ofground water due to

urbanization leads to rapiddepletion of ground waterlevel



Hydrological regime & role of lakes

During the past few yearsthere is a fall in water level of

1-2 m per year all over theCity

Polluted water body causing unhygienic and healthhazards for lake neighborhood.

The worst ground water scenario is experiencedby apartment complexes



Problems faced by urban lakes

Tampering inflow &

outflow channels.

Urbanization.

Change of land use.



Washing clothes

Cattle Wash



Invasive weed - throttlingthe lake ecosystem

Inappropriate shoreline

development

(Encroachments)

Pollution due to Idol

Immersion



Need for restoration of urban lakes

To harvest the preciousrainwater and augment shortfall

in water supply needs of

Hyderabad

To moderate the flood risk by

interconnecting the lakes

To utilize the wastewater by

treatment process during the dry

weather and maintain lake water

balance

To improve the scope for

recharge of ground water withinthe influence zone of the lakes



Need for restoration of urban lakes

To improve the health conditionsof people living in the lake

surroundings.

To enhance the biodiversity in

and around the lakes.

To induce recycling and reuse of

wastewater after treatment for

non-potable uses for gardening

and industrial purpose.

Develop local economy through

eco-tourism activit ies at lakes.



HUDA has taken up the task of restoration of lakes in the

Hyderabad Metropolitan area to conserve the water bodies and toincrease the ground water table with clean water.

In the first phase, out of 169 large water bodies notified, 87 lakes

are being taken up under Green Hyderabad EnvironmentProgramme (GHEP) from 2004 onwards



Categorization of lakes for development

• Category – I (more polluted) - 18 nos

• Category – II (moderately polluted) - 69 nos

These lakes are categorized based on certain criteria like

degree of pollution, size of the lake, proximity to habitation,etc.



Baseline Work

Detailed survey of the lake and its surroundings and preparation

of the lake plan.

Bathymetry of the lake for area - volume of the lake.

Database on watershed and the ground water quality and water

table in all seasons.

Preparation of the Catchment area plans.

The flow measurements of all incoming dry weather flows andoutflows of the lake

The flow measurements of all incoming wet weather flows and

outflows of the lake.

Daily lake water level recordings.

Pan evaporation data from the Meteorological dept.

Rainfall data from the Meteorological dept. for calculating the

storm water runoff from the catchment area into the lake.

Cont..



Baseline Work

Dry weather flows for the projected population for the year 2031

is calculated by using census data.

The capacity of Sewerage Treatment Plant is fixed based on the

quantity of minimum flow required into the lake to maintain its

water balance which is equal to the maximum water loss due toevaporation and percolation under no outflow condition during

the dry season when the evaporation is highest.

Water quality analysis of inflow, lake water and outflow of thelake for all parameters such as BOD, COD, DO, Total Nitrogen,

Total Phosphorus and trace metals etc.

The sediment analysis of the lakebed in different layers

depending up on the nutrient values in the sediment.

Socio economic study of the lake surroundings for identification

of direct and indirect dependents within the vicinity of the lakes.

Biodiversity study of the lake for compiling on the currentbiodiversity.



Restoration works at lakes

Category - I

Formation of peripheral bund

along the shore line of the lake Desilting the lakebed by dredging

Strengthening and widening of

main bund Restoration of surplus weirs and

sluices

Construction of STP for treatingthe raw sewage and letting the

treated water into the lake to

maintain the lake water to the

desired level



Restoration of inflow and

outflow channels

Diversion of excess

sewage by layingpipelines.

Beautification of lakebunds and periphery with

landscaping and

plantation.





Category - II

Formation of peripheral

bund along the shore line of

the lake

Desilting the lakebed by

dredging

Strengthening and widening

of main bund

Restoration of surplus weirsand sluices

Restoration of inflow and

outflow channels

Plantation on Lake bunds

f S



Process Details of The STP

Interception, diversion and collection of sewage

Screening of floating matter & grit

De-Nitrification (Biological process)

Extended Aeration with fine pore diffused membrane

Flocculation with Alum dosing for phosphorusremoval

Settling by Plate Settlers

Chlorination & Filtration

Clear treated effluent to wetland where special type of

plants viz. cattails and bullrush are planted for

removal of further phosphates and nitrates

Tertiar Treatment Process



Tertiary Treatment Process

Wetland

Lake

Raw sewage

A Vi f th STP



A View of the STP

DN Tank

Aeration

Flocculation tankPlate settlers

Pressure filter

Sludge drying beds

Power room

Lab

R t ti f S fil d L k



Restoration of Safilguda Lake

Before Intervention

After Intervention

R t ti f L h L k



Restoration of Langerhouse Lake

Before intervention

After intervention

A Vi f S L k



A View of Saroornagar Lake

Description BOD COD DO TKN Total P

Lake Water Before Intervention 65.00 212.00 3.40 14.00 5.87

Lake Water After Intervention 25 92 6.2 9 1

Stan d ar d s <10 <50 >5 <5 <1

A Vie of Langerho se Lake



A View of Langerhouse Lake



Lake Water After Intervention 14.00 32.00 5.40 4.15 0.80

Stan d ar d s <10 <50 >5 <5 <1

A view of Pedda Cheruvu Nacharam





Lake Water After Intervention 16.00 42.00 5.60 6.15 1.20

Stan dar ds <10 <50 >5 <5 <1

A view of Pedda Cheruvu, Nacharam

A view of Resident friendly STPs



A view of Resident friendly STPs

Mir Alam Tank

Saroornagar Lake

Biological Treatment Facil ity



Trees, Bamboo and ground

cover helps in increasing the

Bio-diversity as well as selfpurif ication by absorption of

phosphates and Nitrates

Floating macrophytes likepistia and duckweed help in

removal of inorganic

Nitrogen and Phosphorus in

the wetland

Biological Treatment Facil ity

Lake Landscapes



Lake Landscapes

Provides enhanced

aesthetics to the lakes.

Increases opportunity

for gainful employmentthrough eco-tourism

Bio diversity of Restored Lake



Exclusive Bird Island

created at Safilguda

Lake

Rich faunal and floralBio-diversity in the

midst of the city

Bio-diversity of Restored Lake



A Paradise for Birds in themidst of urban built-up area

Lake eco-system and

wetland contribute a lot

to the bio-diversity

OUTCOME : SOCIO ECONOMIC BENEFITS



Improvement in the Lake water quality

from Hyper-eutrophic condition toMesotrophic condition

Increase the Biodiversity of the Lake

Increase in pisciculture activities

Employment generation by Eco-tourism

activity

Increase in recreational facilities andwater sports.

Improvement in the groundwater quality

Improvement in human health of lakesurround

Improved aesthetics

Enhancement of property values in thelake surroundings

OUTCOME : SOCIO-ECONOMIC BENEFITS

pl-6 jayesh ranjan

Documents