Lake restoration details and Rankala lake case study

1. LAKE RESTORATION
By:- ADITYA SUDHIR PATIL.
Roll no. :- 52, Class:- T.E. (B).
D.Y. PATIL COLLEGE OF ENGINEERING & TECHNOLOGY.
Guided By :- Asst. Prof. A. S. SUTAR .

2. CONTENT
 INRODUCTION.
 FUNCTIONS OF LAKES.
 CAUSES OF LAKE RESTORATION.
 NECESSITY OF LAKE RESTORATION.
 METHODS OF LAKE RESTORATION.
 CASE STUDY.
 CONCLUSION.
 REFERENCES.

3. INTRODUCTION
 LAKE
 LAKE RESTORATION

4. FUNCTIONS OF LAKE
Substitute the drinking water.
Substitute the ground water recharging.
Useful for cultivation.
Useful for domestic activities.
Useful for aquaculture activities.
Useful for water theme centered tourism.
Influence and Maintain the local climate.
Influence local precipitation.
Attracts migratory birds and native birds.
Act as an efficient flood control system.
Solve the water scarcity issues in summer.
Enrich the floral and faunal communities.

5. CAUSES OF LAKE POLLUTION
 Dumping of all kind of solid wastes.

6.  Discharge of untreated municipal sewages.

7.  Discharge of industrial waste water

8.  SILTATION IN LAKES

9.  Poor maintenance of lake.
 Poor city master plan.
 Lack of awareness on the role on water bodies and Nature.

10. NECESSITY OF LAKE RESTORATION
 LAKE AS WATER SOURCES
 LAKES AS TOURIST AND RECREATION LOCATIONS
 LAKES AS BIODIVERSITY CONSERVATION AREAS

11. METHODS OF LAKE RESTORATION

12. CASE STUDY OF RANKALA LAKE
 AIMS AND OBJECTIVES
 MATERIALS AND METHODS
Study Area Characteristics :
1. Area of about 6682 ha
2. 550 m above mean sea level between
16ᴼ 42” N Latitude to 74ᴼ 14” E

14.  Pollution Sources in Rankala Lake:
1. Sham Society’s sewer
2. Sairnaik Colony sewer
3. Partala sewer
4. Deshmukh sewer

16.  PRESENT STATUS OF LAKE

17.  Water Quality Analysis
Parameters In front of shalini
palace
In front of Rankala
Tower – Rajghat
Near Padma Ghat Near Irani Khan Sham Society
nallah
pH 7.8 8.2 8.2 8.6 7.9
DO (mg/l) 6.8 6.6 5.9 5.6 5.29
BOD (mg/l) 2.8 3.2 3.36 4.02 3.81
TS (mg/l) 223.6 203.8 196.5 201.2 283
TSS (mg/l) 58 40 28 35 53
TDS (mg/l) 165.6 163.8 168.5 166.2 230
Conductivity 344 341 350 346 469
Chlorides (mg/l) 59.56 51.02 59.56 59.56 53.89
Alkalinity (mg/l) 44 36 44 44 24
Total hardness (mg/l) 132 124 124 116 168
Calcium hardness
(mg/l)
30.27 28.59 30.27 30.27 50.46
Magnesium hardness
(mg/l)
24.82 23.28 22.87 20.91 28.67
Turbidity (NTU) 27 17 45 41 27

18.  Water Quality Index (WQI)
Equation 1: Qn = {100 * [(Vn - Vio / Sn-Vio)]}
Where,
Qn = Quality rating for nth water quality parameter.
Vn = Estimated value of nth parameter at a given sampling location.
Sn = Standard permissible value of the nth parameter
Vio = Ideal value of the nth parameter in pure water.
Equation 2: Wn = (K/Sn)
Where,
Wn = Unit weight for nth parameter
Sn = Standard value for nth parameters
K = Proportionality constant.

19.  Equation 3: WQI = [(ΣQnWn) / (ΣWn)]
Range of WQI Status of water quality
00 – 25 Excellent for drinking
26 – 50 Good for drinking
51 – 75 Poor for drinking
76 – 100 Very poor for drinking
< 100 Unsuitable for drinking

20. Parameters Standard Units Recommended Agency Unit Weight
pH 6.5 – 8.5 [ICMR], [BIS] 0.2190
DO (mg/l) 5 [ICMR], [BIS] 0.3733
BOD (mg/l) 5 [ICMR], [BIS] 0.3733
TDS (NTU) 500 [ICMR], [BIS] 0.0037
Conductivity (milli moles) 300 [ICMR] 0.371
Total hardness
(mg/l)
75 [ICMR], [BIS] 0.0062
Calcium hardness (mg/l) [ICMR], [BIS] 0.025
Magnesium hardness
(mg/l)
30 [ICMR], [BIS] 0.061
Total alkalinity (mg/l) 120 [ICMR] 0.0155
Chlorides (mg/l) 250 [ICMR] 0.0074

21.  Results of Water Quality Index
Sample locations WQI
In front of Shalini palace (S1) 77.38
In front of Rajghat (S2) 83.39
Near Padma Ghat (S3) 87.91
Near Irani Khan (S4) 94.70
Sham society nalla 99.37

22.  CONCLUSION
i. 4 major sewage terminals pouring sewages in the Rankala lake water and
thus heavily polluting the lake.
ii. In Lake catchment area, insufficient underground drainage system was also
observed.
iii. Based on water quality index status of the lake was found to be very poor.
iv. Eutrophication promotes excessive plant growth and decay, favors certain
weedy species over others, and is likely to cause severe reductions in water
quality.
v. Washing of animals, clothes, Vehicles, bathing activities, immersion of
Ganesh idol and Nirmalya, disposal of remains of fast foods at Chaupati in
lake, are also contributing pollution in the lake.
vi. Following some suggestions are made for the conservation of lake.
• Prevention of pollutant inflows into lake
• Removal of submerged and floating aquatic weeds from the Rankala lake
• Catchment treatment plan for the Rankala Lake
• Proper disposal of solid waste in the Rankala Lake catchment area

23. CONCLUSION