Restore Shikaripalaya Lake,Bangalore

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About the Project

SSIR (Samsung Semiconductor India Research) and Oasis Foundation signed an MoU on the 4th of February 2022 to rejuvenate the 19-acre Shikaripalya Lake in Hulimangala Gram Panchayat, Electronic City.

• The project, funded by Samsung India Private Limited, aims to restore the lake's ecosystem, which has been spoiled due to:

1. Years of city waste accumulation

2. Sludge formation

3. Non-availability of proper treatment systems

4. Years of abuse of feeder drains with sewage water

• Inculcate sustainability principles developing the green school concept in the children’s mind.

• These factors have resulted in the entire ecosystem of the lake being negatively affected.

• As a consequence, the lake currently stands as a dead lake, with no clean water and no aquatic life.

• The total cost of this multi-year project is ₹1,37 crores, and it is fully funded by Samsung. The budget for the year 2021-22 was ₹70,29,910.

• Oasis Foundation partnered with That's Eco Foundation (HandsOnCSR) and Malligavad Foundation to restore the lake back to its former glory.

Objectives

The objective of this project is to restore and revitalize the 19-acre Shikaripalya Lake in Hulimangala Gram Panchayat, Electronic City. The project, funded by Samsung India Private Limited with a budget of ₹1.37 crores, aims to achieve the following

• Environmental Restoration: Address the impact of city waste accumulation, sludge formation, and lack of proper treatment systems. Mitigate feeder drain misuse and sewage water contamination.

• Ecosystem Rehabilitation: Rejuvenate the lake's ecosystem, promoting the return of aquatic life and ensuring clean water.

• Sustainability Initiatives: Introduce eco-friendly waste management, water treatment, and nature conservation practices.

• Collaborative Partnerships: Work with That's Eco Foundation (HandsOnCSR) and Malligavad Foundation for combined expertise and resources.

• Public Awareness and Education: Raise awareness about lake conservation and engage the local community in preservation efforts.

• Monitoring and Evaluation: Implement comprehensive tracking and evaluation to measure project progress and success.

• Community Engagement: Involve and empower the local community in decision-making and conservation activities.

The project seeks to transform the Shikaripalya Lake into a thriving and sustainable ecosystem, setting a precedent for responsible lake management and environmental restoration.



Interventions

• De-weeding

• De-watering

• Safety walls

• Sludge removal

• De-silting

• Bund strengthening

• Inlets & outlets reconditioning

• Lagoon creation

• Natural sewage treatment

Intervention In Phase 1 Intervention In Phase 2 Intervention In Phase 3
1.Deweeding & Sludge removal • Silt removal – A, B & some part of C & Movement of silt from lakebedto bund. • Bund strengthening& Natural sewagetreatment system.
2.De-silting & Bund strengthening. • Bund strengthening & Slopeconditioning. • Planting aquatic plants for water purification&Clearingencroachments & other alliedactivities
3.Inlets & outlets reconditioning • Lagoon creation
4.Lagoon creation • Wadelia and Cana plantation
• Clearing encroachments and other allied activities


Key Result Areas of Phase 1:

Please refer to the image below for your reference.

All excavation work in Part C of the lake is completed. This is approximately 50% of the lake area.


1. Quantity of sludge and silt removed:


• Total excavation by earthmovers: 8 earthmovers x 30 days x 300 CuMt = 72,000 CuMt.

• 1.5 Mt excavation of approximately 50% of the lake: 19 acres x 4046 SqMts = 76,874 / 2 = 38,437 SqMts x 1.5 Mt average = 57,656 CuMt.

• Total Sludge removed = 72,000 – 57,656 = 14,344 CuMt

• Total silt removed = 43,312 CuMt


2. De-watering:


• [19 Acres x 4046 SqMts] water-spared area – 20% (Dry area) = 61,499 SqMts (Effective area) x 1.5 Mts (average water depth) = 92,248 CuMt of sewage water removed. In other words, 9.22 crore Lts of water was removed.

• The silt was used for strengthening bunds and the walking path around the lake.



Key Result Areas of Phase 2:

Please refer to the image below for your reference.

1 Bund strengthening of Lake C and B was carried out. This included the area around the north side (near the school).



2 De-silting

a. Desilting of Lake B was undertaken, and the silt was shifted to a vacant land on the south-west side of the lake.

b. The silt that was previously shifted from Lake C to Papanna’s land was relocated to the same vacant land on the south-west side.



3. Diversion of sewage and trenches.

a. Sewage entering Lake A is directly diverted to the outlet.

b. Trenches were also made on the extended road.



4. Lagoon work.

a. In Phase 1, the lagoons have been deepened, and new lagoons have been created. The lagoons in Lake A are now completed.

b. This activity was supposed to be taken up in Phase 3 as per the agreement, but it was advanced to Phase 2 as it was deemed critical and needed immediate attention



5. Cleaning,levelling,and finishing:

Finishing and strengthening of the bunds in B and C lake were taken up. Levelling the corners of the bund was done.



Challenges were faced due to rain, but all the bunds have been worked and reworked on.

6. Pipe installation



7. Road construction: Leveling of roads and walking track have been completed around the lake:



8. Removal of encroached houses



8. Bund strengthening activities:

Wadelia and Cana plantation was done on the slopes of lagoons and the lake. This activity was taken up in phase 3 but started early due to good rain.



9. Exterior finishing work of lakes: The finishing touch of exterior parts of lake A, B, and C has been done.



10. Shifting of silt: The silt of lake



Key Result Areas of Phase 3:

Wadelia saplings were picked from Binkipura, Newtown and Mardonahalli Lake and planted in Shikaripalya



New Capacity Of The Lake:

Phase1:

• CTD designed training program of total hours scheduled at 4hours a week on 36 teaching techniques and aides. This project focused on 4 modules:

Phase 2 And 3:

• Total Excavation: On an avg 5 Earth movers x 90 days X 300cumt = 1,35,000CuMt of sludge / silt removed. 1.5Mt Excavation in approximately the next 30% of the lake: 19acre x 4046 Sq Mts = 76,874 * 0.3 = 23062 Sq Mt x 1.5 Mt avg = 34,593 Cu Mt. Total sludge / silt removed = 1,35,000 - 34,593 = 1,00,407 CuMt.

• New water capacity of the lake: 19 x 80% = 15.2 Acres x 4046 cu Mt x 5Mts = 3,07,496 Cu Mt i.e. approximately 30.7 crore Ltr of water.



Challenges Faced:

This rainy season began early, impacting the bund construction on Lake B, which required multiple earth-moving efforts. Rain delays caused difficulties, with dumpers taking longer and makeshift houses near the northwest lagoon facing water entry. Challenges emerged while working near these houses, where even at 15 feet depth, sludge was present, prompting innovative solutions. Previous plastic waste in the lake complicated the work and caused seepage between Lake A and B. Intervention involved obtaining Education Department permission for training teachers on CTD modules. Heavy rain disrupted lagoon work on Lake C, causing erosion and delays. Machine idleness and data loss due to continuous rain posed challenges for operators and helpers. Despite the Tahsildar's notice, encroached slums persisted due to political influence, and demolition took place in phases, successfully clearing some houses.



Outcomes

• Everyday foot fall of around 500 people come for a nearly morning walk in the lake from neighbouring communities.

• Forest department has planted around 1800 saplings around the lake. Same will be maintained for the next 3 years by them.

• NGT - National Green Tribunal also visited the lake on 7th July. A 18 page report will be submitted to NGT on the current situation of the lake. There was a case against NGT with respect to Shikaripalya Lake. We have solved their problem with this CSR initiative. NGT will share an appreciation after the report and work completion.

• The flow of 10 MLD of sewage into the lake is not joining the main lake.



Expected Impact:

• By the end of 3 years, 1800 trees x approximately 25Kg of carbon sequestration/tree/year = 45,000 Kgs of carbon sync per year.

• Major improvement in health for the slum dwelling areas around the lake.

• 150 borewells to be recharged around the lake. Upto 3 inch of water output expected.

• Benefit to be seen in 2 to 3 villages with an average population of 1500 people in each village.

• Current existing water level: 700-800Ft and within 2 years, it is expected to dropdown to 500-600 Ft.

• Current yield: 1-2 inches; expected after monsoons around 2.5-3 inches.

• The Natural sewage treatment plant will start working after flora and fauna develops in the worked area.

• Lakes in the lower catchment area will receive cleaner water.

Video

Lake restoration
Shikaripalaya, Bangalore




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