Sewage and sullage water are being let into the lake through storm water drain from Netaji nagar flows into the waterbody directly without any filter. Launderer launders the clothes using the water from the Encroachmentlake. in the form of thatched roof, tailed roof & shed
1
Activities observed : - Laundry - Fishing - Children playing
Maduravoyal in ChennaiTheAlapakkam
About the lake : Owned by: Public Works Department - till 2020 Chennai Corporation - from 2021 Chennai
CONNECTIVITY - ROAD NETWORK LANDMARKS
Study Area : Alapakkam Lake, Chennai MADHUMITHA G R | 113618251011 | SCHOOL OF ARCHITECTURE - ST.PETER’S COLLEGE OF ENGINEERING & TECHNOLOGY LAKEFRONT DEVELOPMENT Chennai IndiaTamilnaduTamilnaduinin Area : 10.4 acres
In the western side of the shore, it is found that old building materials & solid wastes are dumped by the street vendors.
Lake, locally known as Kuyavan Eri, is located in between the River Coovum in the north and Alapakkam in the south. The lake once sprawled over 100 acres and which now is spread over just 10.4 acres. The depth of the lake is about 25 feet.
BypassVanagarammainroad mainAlapakkamroad ArcotMumbaiRoad Highway NH48 Anna EstateIndustrialPorurLake HospitalMeenakshiAGSMaduravoyal 1 2 3 4 5 6
View of the lake from North bund. View of the East bund. 32654
Water Occurrence (1984 - 2020)
> 0% 100% Seasonal Permanent12111 %Recurrance Monthly Water WaterMonthRecurranceHistoryYear STUDY AREA DELINEATION
CONTOUR
Water Seasonality Majority of the lake water is seasonal. Permanent water is found along the Eastern edge. WaterAlways
FAUNA : Different species of bird can be spotted on the little islands located inside the water body. The pied kingfisher and the little cor morant are two examples. The presence of the birds symbolizes that fish can be found inside the lake. MAP
Decrease No change IncreaseWaterSometimes
It is observed that most part of the lake water lacks in certain seasons. The central part of the lake between the Eastern and Western edge always contain water. Water Occurrence Change Intensity (1984-2020) The map depicts the drastic decrease in the occurrence of water within the lake perimeter.
FLORA Lush green weeds are covering the water body. Most of them can be identified as an invasive species. Native species vanished away because of the same. The invasive plants are taking away water from the original plants. As a result, they dry up and die. The original habitat gets destroyed. 2010
MADHUMITHA G R | 113618251011 | SCHOOL OF ARCHITECTURE - ST.PETER’S COLLEGE OF ENGINEERING & TECHNOLOGY LAKEFRONT DEVELOPMENT
MADHUMITHA G R | 113618251011 | SCHOOL OF ARCHITECTURE - ST.PETER’S COLLEGE OF ENGINEERING & TECHNOLOGY LAKEFRONT DEVELOPMENT EAST EDGEWEST NORTHEDGEEDGE NODES PATHS TRAFFIC PATTERN NODES & PATHS TRAFFIC PATTERN NODES & PATHS TRAFFIC PATTERNIndustrial40%Institutional28%Residential20%Commercial10%Civic2%ESUDNAL48Residential%Industrial22%Institutional 6 %OpenCivic10Commercial%5%space 9 % Industrial54Residential%8 Institutional%8 %Open24Commercial%space 6 % Primary NodesVehicular SecondaryNodesLayerPedestrian Layer Path through hard boundariesPaththrough soft beingPotentialboundariespathsobstructed ESUDNAL ESUDNAL Meenakshi Medical College & Hospital SECTION SECTION SECTION
High public usage due to institutions and developing industries. Laundry is done in large scale. Has preferable access paths.
• The rain water is collected from the roof and passes through a maze channel.
Inlet Outlet Typical Reed Bed FRAGMENTS STUDY
1 24 3 5 798 10 6 11 654321 1011987Primary EntrySecondaryIslandPebbleGazeboChildren’sEntryParkPark Storm Water LaundryWetlandInlet Bay Fish ToiletsCulture
Scheme Potentials:1
Rinse Water Harvesting:
Issues: People activity is low along the lake which gives rise to illegal activities.
• The maze channel removes big chunks of wates and leaves.
• The grey water passes through the Reed Bed where it is purified.
MADHUMITHA G R | 113618251011 | SCHOOL OF ARCHITECTURE - ST.PETER’S COLLEGE OF ENGINEERING & TECHNOLOGY LAKEFRONT DEVELOPMENT Scheme 1 Scheme 2 Scheme 3 Scheme 4
Issues: Encroachment in the form of kutcha houses. SWN is connected without any filter.
Scheme Potentials:3
Scheme Potentials:2 Easy access to islands. Increasing number of residences.
• The purified water is connected to the toilets for flushing purposes.
Rain Water Collecting pipe
LAUNDRY BAY Reusing Grey Water:
Reed Bed Maze Channel Grey WaterSandGutterBed
• The water then passes through the sand bed, gets filtered naturally.
• This water could be used for Washing.
Scheme 4: Potentials: Developing residences due to the in stitution. Comparatively has more open spaces.
1 Rinse 2 Rinse 3 Washing Stone Rain
AREA STATEMENT Treatment Wetland - 2013 sq.m Laundry Bay - 1470 sq.m Fish Culture - 1328 sq.m Children’s Park - 711 sq.m Pebble Park - 789 sq.m
High public usage due to institutions and developing residences.
Issues: Bunds are completely encroached by residences. Garbages are dumped from the residences. No access to the lake.
Issues: No acess to the edge. Completely encroached.
SITE PLAN
• To retain water for the entire dry season and assist with wet season colonisation of the macrophyte zone.
5.OUTLET:The outlet is a key hydraulic structure to control wa ter level and flow to achieve the required detention time.
TREATMENT WETLANDS
PEDESTRIAN PATH AND PARKS
3 4 5
• Treatment wetlands should be located where it receives water run-off from a significant area of production and where most of the catchment area is production land, rather than non-cultivated, low-pollutant generating land use.
• The design depth/normal water level of the macrophyte willzonegenerally be between 0.3-0.7m deep.
• Children’s Park and Pebble park is provided.
• In general, the water depth should not exceed half the average plant height for more than 20% of the time
• Treatment wetlands can be sized to capture run-off from a specific rainfall event.
3.Deep pools:located near the inlet and outlet.
2.Inlet zone: designed to allow the design flows to enter the macrophyte zone. It should be of a suitable gradient (e.g. at least 0.3%) and have measures to prevent blockages.
• There should be provision for the wetland to be drained.
•GUIDELINESWetlandsto be between 2-10% of the size of the upstream catchment
• It should include a riser outlet.
Children’s Park Pebble Park Northern Edge Eastern Edge
MADHUMITHA G R | 113618251011 | SCHOOL OF ARCHITECTURE - ST.PETER’S COLLEGE OF ENGINEERING & TECHNOLOGY LAKEFRONT DEVELOPMENT 1 2
• These areas should be between 1.2 to 2m deep, depending on the climate and site constraints
• Pedestrian path is laid along the edge with benches and Gazebo.
4.Macrophyte zone: will be seasonally inundated and designed to dry out periodically, although dry periods should not exceed 60-70 days at a time.
1.Sediment basin: trapping coarse to medium sediment (125µm) to avoid these sediments smothering the macrophyte zone.
• The Northern Edge is rejuvenated by increasing the activities in the form of Parks.
• Island is planted with native species.
• The length to width ratio of the macrophyte zone should be greater than 4:1 to maximise hydraulic efficiency.
• Opportunity to increase the habitation of migratory birds. Islands, Gazebo & Benches