Environmental Management Plan
1.0 INTRODUCTION:
M/s. Voora Property Developers Private Limited is one of the premium developers catering to all sections of the society. Started in 1995, under the flagship company of Voora Builders, the firm has almost completed nearly 15,00,000 sq.ft with utmost satisfaction to all customers from Residential, Commercial and Industries.
Now, they have proposed a Residential Development in Tondiarpet Village, Chennai District with 150 Nos. of Dwelling Units is a Total Plot Area of 7097.09 Sq.m. The Land is developed by Voora under JV with a Special Power of Attorney given to Voora Property Developers towards the Proposed Development. The said area is classified as CRZ – II Zone and the Proposed Residential Development is a permitted activity as the said Area is towards the Landward Side of the Existing Road.
With a commitment to comply with statutory and setting up an Enviro-friendly project, the treated water is collected and reused for flushing and gardening. Need to mention the rain water harvesting scheme is also in place to collect and reuse the roof water. Also, a well designed storm water drain is also proposed all along the periphery.
2.0 LOCATION OF THE PROJECT:
The Proposed Project Site is located at Tondiarpet Village, Tondiarpet Taluk, Chennai District. The corresponding survey number of the project site is R.S. Nos. 4061 pt of Block No. 78, Old S. Nos. 3761, 3762 and 3763 of Tondiarpet Village with Total Plot Area of 7097.09 m2 and Total Built up Area of 25,774.28 m2 inclusive of FSI, Non FSI and Free of FSI Area. The proposed site is abutting the 21 m wide Ennore High Road. The location map of the proposed project site is as below.
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI
Table 1: Site Details
1 S. No. of the Project site: R. S. No. 4061 pt, Old S. Nos. 3761, 3762 & 3763 2 Latitude & Longitude 13°08’31.855”N & 80°17’55.099” E VOC Nagar Metro Railway Station – 1 Km 3 Nearest Railway Station Tondiarpet Metro Railway Station – 2.5 Km 4 Nearest Airport Anna International Airport – 20 Km 5 Nearest Fire station Thiruvottiyur Fire Station – 2.50 Km 6 Proximity Ennore High Road – Abutting Road
7 Temperature, Min & Max 0C 21 °C – 37 °C 8 Annual Rainfall 1100 mm 9 Seismic Zone Zone III 10 Water Bodies Bay of Bengal – 80 m
Figure 1.0 (a): Location Map
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI
Figure 1.0 (b): 5 KM RADIUS TOPO MAP
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI
Figure 1.0 (c): 1 KM RADIUS TOPO MAP
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI
Figure 1.0 (d): PROJECT SITE
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI 3.0 AREA STATEMENT:
The area statement for the proposed Residential Villa Development is given in Table 2.0
Table 2.0 a: Area Statement AREA AREA DESCRIPTION in Sq.m in % Plot Coverage Area 1529.43 21.55% Road Area 2790.32 39.32% Surface Parking Area 1640.00 23.11% Greenbelt Area 1077.34 15.18% Amenities / Service Area 60.00 0.85% Total Plot area 7097.09 100.00%
Table 2.0 b: Builtup Area Statement
Free of FSI Total FSI Area in Non FSI Area Area- Covered Built-up Area in BLOCK Units Sq.mtr in Sq.mtr Parking Area sq.mtr in Sq mtr Common - - - 2605.85 2605.85 Basement Stilt Parking - - - 1267.22 1267.22 Ground Floor - 974.00 - 974.00 Shop 1st Floor - - - 1573.46 1573.46 Parking 1st Shop - 949.60 - 949.60 Tower 1 [2 – 75 8910.52 280.75 9191.27 27 Floors] Tower 2 [2 – 75 8932.13 280.75 9212.88 27 Floors]
Total 150 19766.25 561.50 5446.53 25774.28
FSI Allowed 3.25
FSI Achieved 19766.25/7097.09 = 2.785
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI 4.0 PARKING DETAILS:
Table 3.0: Parking Required
S. Block FSI Area FSI Area / Flat Required No Total No. of Total No. of No. / No. of (in m2) of Car Parks Car Parking Two- Flats / unit* Required Wheeler Parking Required 1. Shop & Club 2348.14 1 / 50 Sq.m 47 47 House 2. Residential 150 115 1 150 - 3. Total 197 47 4. 10% Visitors Parking 20 5 5. Total Parking Required 217 52 Note: * As per CMDA Norms
Parking Provided: DESCRIPTION CAR TWO WHEELER Basement Parking 70 29 Surface Parking 100 10 Stilt Floor Parking 30 27 1st Floor Parking 26 34 Total Parking Provided 226 100
Number of Car Parking Provided – 226 Nos. Number of Two Wheeler Parking – 100 Nos.
Of the total parking facilities provided, 5% shall be provided for differently abled with provisions ensuring easy accessibility to main entrance, mainly in the surface level and stilt level
5.0 POWER REQUIREMENT:
The Power requirement of 2 MW for the proposed project will be sourced from Tamil Nadu Generation and Distribution Corporation Limited (TANGEDCO). 2 Nos. of DG Set of capacity 500 KVA shall be used as power back up in case of effecting supply during power failure. The DG sets shall be provided with acoustic enclosures as well.
The diesel requirement of about 400 litres for the DG operation in the event of power failure scenario would be stored in 2 Nos. of HDPE Drums each of Capacity 200 litres at any given
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI point of time in a day. Since per day storage of diesel is well within the limits, the requirement of CCoE NOC is not warranted.
Table 4.0: Stack Details S. No. DG Sets Vent Proposed Stack of 200 mm diameter from the DG is exhausted at an elevation of 5 m above Ground Level. 2 Nos. 1. The DG Set will be housed in an acoustic enclosure (500 KVA) The DG sets shall comply to the noise levels and emission norms prescribed by CPCB / TNPCB
6.0 POPULATION DETAILS:
The total occupancies for the proposed Residential Development is estimated to be 1025 including the Visitors. The details of occupants are as listed in Table 5.0.
Table 5.0: Details on Total Occupants S. No. Description No. of Persons 1 Fixed Population 750*
2 Staffs 50
3 Visitors/Flats 225 Total Number of Estimated Persons 1025 NOTE: *THE CONSIDERATION IS AS PER THE PROVISIONS OF NBC AND ESTIMATED AT THE RATE OF 5 PERSONS / DWELLING
Based the estimated population, the solid waste generation and water requirements are calculated as follows.
7.0 SOLID WASTE GENERATION:
The Solid Waste that would be generated from the Residential Development is estimated to be 615 Kg/day as shown in Table 6.0. It would include paper waste, wood, vegetables/fruits waste, waste foods etc. These wastes will be segregated as Biodegradable and Non- biodegradable.
The Solid Waste collected will be segregated at site and disposed through Authorized Waste Handlers / Recyclers and also through Chennai Corporation provisions as the case may be.
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI Table 6.0: Details on Solid Waste Generation Non- No. of Quantity Biodegradable S.No Description Biodegradable Persons (Kg/day) (Kg/day) (Kg/day) 1 Waste from Residential 1025 615 369 246 Development 2 STP Sludge 5
NOTE: *THE ESTIMATION ON SOLID WASTE MANAGEMENT IS AS PER THE PROVISIONS OF CPHEEO MANUAL
[3.3.6.2] ON SOLID WASTE MANAGEMENT WITH THE MAXIMUM CONSIDERATION OF 0.6 KG/PERSON/DAY.
THE DISTRIBUTION OF BIO DEGRADABLE AND NON-BIO DEGRADABLE IS TAKEN AS 60% FOR THE FORMER
CASE AND 40% FOR THE LATTER
8.0 WATER REQUIREMENT:
CONSTRUCTION PHASE: Number of employees anticipated at any given point of time – 50 Water Requirement – 60 lpcd * Domestic Requirement – 30 lpcd * Flushing Requirement – 30 lpcd Construction Purpose – 30 KLD Miscellaneous like Dust Suppression, etc., – 2 KLD
The Total water requirement during construction phase will be met through Authorized Tankers. Existing Toilets provisions will be utilized with periodical cleaning, thereby avoiding unhygienic condition leading to health hazards.
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI
Water Source – Authorized Tankers Water Requirement 35 KLD
Domestic Water Construction Miscellaneous Flushing Water 1.5 KLD 30 KLD 2 KLD Requirement 1.5 KLD
Sewage Generated 2.7 KLD
Mobile Toilets wherein regular cleaning will be insisted
Figure 2.0: Water Balance Chart – Construction Phase
OPERATION PHASE:
Total Water requirement for the proposed residential development as deduced in Table 7.0 would be 111 KLD. The development shall have an In-House STP of capacity 100 KLD for treating the sewage and it is proposed to reuse the treated sewage for flushing (41 KLD) and greenbelt development (4 KLD) within the facility. Thus, the fresh water requirement for the proposed development 70 KLD shall be met from CMWSSB Provisions as the site is well within the CMWSSB Zone IV.
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI Table 7.0: Water Requirement Water Total Water S. No. Description Occupancies Consumption Requirement (KLD) (lpcd) 1 Fixed Population 750 135 101.25 Domestic [ Drinking, Cooking, Bathing, - 90 67.50 Washing & Cleaning] Flushing – [ Urinals & - 45 33.75 Closets ] Floating Population 2 Staff 50 45 2.25 Domestic [ Drinking, Hand Wash & - 20 1.00 Cleaning] Flushing – [ Urinals & - 25 1.25 Closets ] 3 Visitors 225 15 3.37 Domestic [ Drinking - 5 1.12 & Hand Wash ] Flushing – [ Urinals & - 10 2.25 Closets ] 4 Water for In house Green Belt Development 4.00 5 Total Water Requirement 111 KLD
The staffs would be employed under shift basis, wherein their requirement would be minimal and mainly towards flushing activities. The consideration of the water requirement is based on CPHEEO Manual under Part – 9: Section – I: 4.1.1
Given the above statement of consumption pattern the water requirement briefly categorized as
1. Domestic Water Requirement [ Which is always a fresh water = 70 KLD addition from prospective source ] 2. Flushing Requirement [ Which is always the treated water from STP = 41 KLD getting recycled / reused ] 3. Water For Green Belt Development [ Which is always the treated water from STP = 4 KLD Being reused ]
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI
Total Water Requirement 111 KLD Water Source: CMWSSB Fresh Water Treated Water 70 KLD 41 KLD
Domestic Water Requirement Flushing Water Requirement 70 KLD 41 KLD
56 KLD 80% Sewage Generation 100% Sewage Generation 41 KLD
Sewage Generated 97 KLD
STP of capacity 100 KLD
95% of Sewage Generation
Treated Water 92 KLD
Greenbelt Excess Treated Water Reuse 47 KLD 4 KLD 41 KLD
Greenbelt Area Excess Treated 0.107 Ha water shall be disposed through the existing CMWSSB Sewer Figure 3.0: Water Balance Chart – Operation Phase
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI SEWAGE TREATMENT
Method adopted for the design: The STP Proposal design is of 100 KLD for the sewage generation of 97 KLD.
Characterization: The general characteristics of sewage are considered as shown in the table below.
General characteristics: pH : 6.0 – 8.0
BOD3 : 200 - 250 mg/l COD : 500 - 600 mg/l SS : 200 - 300 mg/l
The anticipated final effluent quality: pH : 6.0 – 8.0
BOD3 : < 5 mg/l COD : < 20 mg/l SS : < 10 mg /l
Mode of Treatment:
The STP shall be based on the Time tested aerobic “Extended Aeration by ASP (Activated Sludge Process)” system. The sewage collected in the collection well, through piping network involving inspection chambers and manholes, will be pumped to Raw Sewage Collection / Equalization Tank through Bar Screen. The equalization tanks are designed to take care of peak flows and provide suitable Retention time to equalize the Inlet sewage. Coarse Bubble Aeration Grid will be provided in Equalization Tank to prevent settling of solids. The homogenized sewage is transferred at constant rate to the Aeration tank using submersible sewage pumps. Extended Aeration agitates all incoming sewage and extended aeration of low organic loading rate to create an extremely stable system. The microbes (MLSS > 2500). The system utilizes longer sludge age than the other aerobic system. Sludge age also known SRT (Solid Retention Time) or MCRT (Mean Cell Residence Time), defines the operating characteristics of any aerobic biological treatment system. This system will dramatically reduce the effluent BOD and the removal efficiency is high because of high
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI detention in the aeration tank. The mixed liquid – solid will undergo endogenous respiration and gets well stabilized. The excess sludge does not require separate digestion and the quantity is minimized. The Secondary settling Tank will provide a larger surface area for effective solid liquid separation. The over flow from the Secondary settling tank will be collected in clarified water tank for further treatment like disinfection and filtration. The Bio Sludge collected at the bottom of the Secondary settling tank is transferred through sludge pump to the mechanical filter press where dewatering and reduction in volume will be done. The dewatered sludge will be disposed as manure for in-house gardening. The treated water will be disinfected through UV treatment. In addition Ultra Filtration would be provided to ensure the treated sewage quality. The treated water is stored and reused suitably for Gardening and Flushing. The excess treated water will be disposed through CMWSSB Sewers.
The units proposed with the design
S. No. Name of the Unit Purpose Bar Screen 1. For removing all floating matters Chamber To even out the flow variations and providing uniform mixture of 2. Equalization Tank sewage by providing Coarse bubble aeration 3. Extended Aeration Extended Aeration (ASP) for oxidization of Biological waste Secondary Settling To separate out the solids from the treated sewage and to separate 4. tank clear supernatant liquid 5. Alum Doser Accelerate rate of settlement Clarified Water To collect the supernatant clear liquid from the Secondary Clarifier 6. Tank for further treatment. To de-water the sludge taken out of Secondary Clarifier and to 7. Filter Press convert the same into manure Pressure Sand 8. To filter out suspended solids if any in the treated water Filter Activated Carbon 9. To remove color and Odor if any in the filtered water Filter Ultrafiltration System to remove any particulates and 10. UF System macromolecules from the Filters To disinfect the treated water to make it safe to come in contact with 10. UV Disinfection humans so that the treated water can be used for gardening / allied uses
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI
RAW SEWAGE
BAR SCREEN CHAMBER
ALUM DOSER EQUALIZATION TANK
AERATION SYSTEM
SLUDGE THICKENER SETTLING TANK
CLARIFIED WATER TANK FILTER PRESS
PSF
SLUDGE TO BE USED AS MANURE
ACF
ULTRA FILTRATION
UV DISINFECTION
TO REUSE FOR FLUSHING / GARDENING TREATED WATER TANK
Figure 5: Water Treatment Flow Chart
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI Design of the individual units: Average Flow : 100 m3/day (5 m3/hr) Influent Suspended Solids : 200 mg/l
Influent BOD3 @ 27 °C : 250 mg/l Peak Flow (3 hrs of Average Flow) : 15 m3/hr
Bar Screen Chamber: Velocity through screen : 0.30 m / sec Adapting screen with bars of 10 mm width and 10 mm clear opening Cross Sectional Area Required : Peak Flow / Velocity Through Screen : (15 / 3600) / 0.3 = 0.014 m2 Area provided = 0.25 m2 Liquid Depth of Screen = 1.0 m Width of the screen = 0.5 m Bar Screen Chamber Size : 0.5 m (L) x 0.5 m (W) x 1.0 m depth
Provide a chamber of size 0.5 m x 0.5 m x 1.0 m to suit sewer gradient to accommodate an inclined bar screen with opening less than 10 mm. Provide a bar screen of 20 X 6 mm flats with 10 mm spacing in between.
Equalization Tank: The flow from the bar screen chamber is let into the collection tank of minimum 6 hours capacity. This tank is provided to even out the flow variation, and to provide a continuous feed into the secondary biological treatment units. Average flow = 5 cum / hr Provide min 6 hours holding capacity. Hence required volume of the tank = 6 x 5 m3
Provide a tank of 30 m3 Tank Size provided = 36 m3 The tank size would be (4.0 m (W) X 3.0 m (L) X 3.0 m Liquid depth)
Aeration Tank: Flow : 100 KLD BOD of Influent Sewage (max) : 250 g BOD / m3 Acceptable BOD at the Outlet : 20 g BOD / m3 BOD load : 25 kg / day Min Efficiency of the plant : 91.5%
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI [Efficiency of Extended Aeration Tanks vary between 85 -92%] MLSS [X] : 3000 g/m3 = 3 kg/m3 F/M ratio : 0.15 Volume of Tank required : Biomass / MLSS Volume of Tank required : [(25/0.15) / 3] : 56 m3 Number of Aeration Tanks : 1 Volume of each Tank : 60 m3 Oxygen required : 2.0 kg/ kg of BOD Oxygen in air : 23 % Sp. Gr of air @ 30 deg : 1.165 Aeration type : Diffused Aeration Oxygen Transfer efficiency : 12 % BOD Load : 25 kg / day Air for Aeration Tank : (25 x 2)/ [1.165 x 23/100) x (12 / 100)*20] : 78 m3 Air for Collection Tank : 60 % of Collection Tank volume : 22 m3 (0.6 x 36 m3) Air for treated water tank : 60% Treated Water Tank Volume : 17 m3 (0.6 x 27 m3) Total Air Required : 78 + 22 + 17 = 117 m3 / hr Air Blower provided : 150 m3 / hr Aeration Tank Size : 5.0 m x 4.0 m x 3.0 m
Settling Tank: Duty : Solid liquid separation Flow : 100 m3 / day Avg. Flow : 5 m3 / hr Providing PVC tube plates to enhance the settling characteristics of sedimentation basin. This allows higher surface loading rate: Surface loading rate : 10 m3 /m2 / day = 1.33 m / hr Settling area required : Average Flow / Surface Loading Rate : 5 / 1.33 = 3.76 m2 = Say 4 m2 Surface area provided : 4 m2 Settling Tank Size : 2.0 m (L) x 2.0 m (W) x 3.0 m depth : 12 m3
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI Straight depth required for proper solid – liquid separation is 2.0 m in Tube settling tank with bottom of 45 deg slope of collect the sludge by gravity. Considering the Hopper, sludge pit, Settling Tank volume : 12 m3 Hydraulic Retention Time (HRT) : 3 hrs Plan Settling Area for tubes : 11 m2 / m3 Tube Pack Volume : 12 x 0.5 = 6.00 m3 Tube inclination : 60 deg Tube Shape : Chevron Tube Height : 500 mm Distance between adjacent tubes : horizontal 120 mm : Vertical 44 mm
Clarified Water Tank: The flow from the secondary clarifier tank i.e., the supernatant liquid is let into the clarified tank, with a minimum 2 hours holding capacity. The tank is provided to hold the treated effluent and give an even flow to the pressure sand and carbon filters. Flow : 100 KLD Retention Time : 2 hrs Tank Volume Required : 10 m3 Tank Volume Provided : 12 m3 : 2.0 m x 2.0 m x 3.0 m Sludge collected in this tank shall be pumped to filter press for thickening of the sludge.
Pressure Sand Filter: Flow : 100 KLD Surface Loading Rate : 8 m3 / m2 /h Surface Area Required : 5 / 12 = 0.42 m2 Diameter of vessel : 800 mm HOS : 1200 mm
Considering the operation of 20 hours of filter Provide Pressure Sand filters 1 No. of 800 mm dia and 1200 mm height with sand as media over layer, under drainpipe, laterals face piping etc.,
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI Activated Carbon Filter: Flow : 100 KLD Surface Loading Rate : 10 m3 / m2 /h Surface Area Required : 5 / 10 = 0.5 m2 Diameter of vessel : 900 mm HOS : 1100 mm Considering the operation of 20hours of filter Provide Activated carbon filters 1 No. of 900 mm diameter and 1100 mm height with activated carbon filter media with under drainpipe, lateral face piping.
Sludge Handling System: Flow : 100 KLD Raw Sewage SS Concentration : 150 mg/l Raw Sewage BOD : 250 mg/l Quantity of sludge due to SS : (100 x 150/1000) x 30% = 4.5 Kg/day Quantity of Sludge due to BOD : (100 x 250/1000) x 90% x 0.25 = 5.625 Kg/day Total Sludge Volume : 4.5 + 5.625 = 10.125 Kg/ day Say 11 Kg/day Pumps: a. Provide 2 Nos. of sewage transfer pumps (one working and one standby) Capacity : 10 m3 / HR @ 15 MWC Type : Open impeller non-clog centrifugal pumps Solid handling size : Up to 25 mm Duty : To pump the sewage from the equalization tank to the Aeration Tank b. Provide 2 Nos. of Sludge transfer pumps Capacity : 5 m3 / HR @ 12 MWC Type : Open impeller non-clog centrifugal Pumps Solid handling size : Up to 25 mm Duty : To pump the sludge from the Clarifloculator to the Sludge Holding Tank. c. Provide 2 Nos. of Filter feed pumps Capacity : 10 m3 / HR @ 30 MWC
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI Type : Open impeller non-clog centrifugal pumps Solid handling size : Up to 10 mm Duty : To pump the Treated effluent from the Clarified water tank through the Pressure Sand Filter and Activated Carbon Filter
Filter Press: Capacity : 1.0 m3 / batch No. of Plates : 12 plates Size : 14” × 14” Material of Construction : Polypropylene Recess Plate Quantity : 1 No.
Ultra Filtration: Ultra Filtration membranes functions as a molecular sieve with pore sizes in the range of 0.1 to 0.001 micron. Ultra filtration removes macromolecules above a certain size, which includes colloidal, microorganisms and organic materials. A fraction of the feed with the above filtered materials shall be drained to the sludge drying beds. To ensure membrane cleanliness provision for back washing with fresh water is provided. Since the materials filtered in this process are high molecular weight substances, the osmotic pressure differential across the membrane surface is negligible. Operating pressure required for filtration is less around 1 to 2 kg/cm2.
Ultra filtration module shall be of Skid mounted with membrane housing, interconnecting piping valves and fittings. The skid shall be provided with flow meters and pressure gauges for easy operation of the system.
Membrane Make - KOCH / Membrane Technologies/GE Membrane Size - Dia 400 x 1500 mm MOC - Hydrophilic polyether sulfone Molecular Cut-off - 100 K Daltons Maximum Feed Pressure - 3 kg/cm2 (g) Maximum operating Temperature - 40 °C
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI Cleaning Arrangements - Back wash with filtered water at defined frequency.
Ultra Violet System: No. Of Unit : 1 Type : Slim Line Housing Material of Construction : SS 304 UV Dosage & Capacity : As per Requirement Disinfection Efficiency : 99%
Final Treated Water Sump with partitions : Considering 5 hours of average flow as holding capacity, the volume of the sump required will be 25 m3 Volume Provided : 65 m3 Size of the sump : 5.0 m × 5.0 m × 3.0 m First Partition : UF Feed Tank [ 25 m3] Second Partition : Ultra Filtered Water for Reuse [ 40 m3]
Filter Press Capacity 1.0 m3 / batch provided to dewater the sludge, as required and sludge shall be disposed to municipal wastes.
The units and its sizes as designed are:
S. No Name of the Unit Size in m.
1. Bar Screen Chamber 0.5 m Х 0.5 m Х 1.0 m 2. Equalization Tank 4.0 m Х 3.0 m Х 3.0 m 3. Aeration Tank 5.0 m Х 4.0 m Х 3.0 m 4. Settling Tank 2.0 m Х 2.0 m Х 3.0 m 5. Clarified Water Tank 2.0 m Х 2.0 m Х 3.0 m 6. Pressure Sand Filter 800 mm dia & 1200 mm ht 7. Activated Carbon Filter 900 mm dia & 1100 mm ht 8. Filter Press 1.0 m3/batch 9. UV Disinfection 10 m3 / hour 10. Ultra Filtration System 6m3/hr Treated Water Tank with 11. 5.0 m Х 5.0 m Х 3.0 m Partitions
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI 9.0 GROUND WATER POTENTIAL:
The objective of the study is the assessment of ground water potential for the proposed site. Further Planning for rainwater harvesting and artificial recharge of ground water will have a positive impact towards the ground water potential.
The source of fresh water for the domestic purpose will be met from CMWSSB. The work includes planning for maximum possibility of rain water harvesting and recharge to ground water regime.
GEOMORPHOLOGY AND SOIL TYPES:
The prominent geomorphic units identified in the district through interpretation of Satellite imagery are 1) Alluvial Plain, 2) Old River Courses 3) Coastal Plains 4) Shallow & Deep Buried Pediments, 5) Pediments and 6) Structural Hills.
The elevation of the area ranges from 183 m amsl in the west to sea level in the east. Four cycles of erosion gave rise to a complex assemblage of fluvial, estuarine and marine deposits. The major part of the area is characterised by an undulating topography with innumerable depressions which are used as irrigation tanks.
The coastal tract is marked by three beach terraces with broad inter-terrace depressions. The coastal plains display a fairly lower level or gently rolling surface and only slightly elevated above the local water surfaces or rivers. The straight trend of the coastal tract is resultant of development of vast alluvial plains. There are a number of dunes in the coastal tract.
Soils in the area have been classified into i) Red soil ii) Black Soil iii) Alluvial Soil iv) Colluvial Soil. The major part is covered by Red soil of Red Sandy/Clay Loam type. Ferrugineous Red Soils are also seen at places. Black Soils are deep to very deep and generally occurs in the depressions adjacent to hilly areas, in the western part. Alluvial Soils occur along the river courses and Eastern part of the coastal areas. Sandy Coastal Alluvium (Arenaceous Soil) are seen all along the sea coast as a narrow belt.
The soil condition at site and its analytical inference forms the basis of the rain water harvesting proposed.
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI TOTAL WATER REQUIREMENT:
The Total Water requirement of the proposed project is about 111 KLD, in which about 70 KLD of fresh water is utilized towards domestic purposes. It is proposed to be met through CMWSSB and therefore the Rain water harvesting, and recharging will have a positive impact on Ground Water Potential.
Rainwater Harvesting and Artificial Recharge to ground water is gaining importance due to indiscriminate withdrawal of ground water for multiple uses. Water bearing formation were become over exploited if the ground water withdrawal exceeds the amount of natural recharge. Due to which irreparable environmental consequences were observed. Over draft of ground water leads to drying up of open wells, deepening of water level in the bore wells, change in quality of water, increase in cost pumping and ecological imbalance. Hence harvesting of surplus run-off occurring during monsoon and artificial recharge to ground water becomes inevitable.
Rainwater harvesting can be done by harvesting of roof top rainwater and collection of surface run-off. Recharge to ground water by rain water harvesting has proved to the most successful methods of water conservation techniques in many parts of country. The methods and design are specific to the site condition.
With the above condition as prevailing at site the consideration on the rain water harvesting is as follows;
The roof water shall be collected separately from terrace through secluded down comers with all the down comers routed to a rain water collection sump positioned at appropriate locations matching with the plumbing scheme of the proposed development. Preferably the sumps shall have interconnectivity to avoid pumping requirements. Rain water collected from other areas viz., hard scapes, path ways, inclusive of the garden area shall be routed through storm water drains provided with on line percolation pits for possible percolation prior to being discharged to the external storm water drain available.
ESTIMATION OF QUANTUM OF RAINWATER HARVESTING:
Estimation of harvestable rainwater can be done in many methods. Use of run-off co-efficient is one of the simplest methods to assess the quantity of rainwater harvested within the area. The
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI effective rainfall is such that the amount of rainfall which can build up surface runoff after satisfying the soil moisture requirement and evaporation loss. It is assumed that about 85% total rainfall is the effective rainfall.
RUN OFF CALCULATION: PRE CONSTRUCTION AND POST CONSTRUCTION SCENARIO:
Rational formula for calculating runoff, Q = (C I A) / 360 Q = Runoff in m3/sec I = Intensity of rainfall in mm/ hr A = Drainage area in hectares C = Co-efficient of run off as below
Run-off co-efficient for various types of surfaces Open grounds, unpaved street 0.30 Parks, lawns, gardens Macadam roads, pavements 0.70 Asphalt pavements Water tight roof surface 0.90
Table 8.0: Runoff Calculation
Pre-Development Post Development Particulars Road & Other Landscape Plot Area Roof Top Area Paved Area Area
Area (in Sqm) 7097.09 1529.43 4490.32 1077.34
Runoff Coefficient 0.30 0.90 0.70 0.30
Rainfall (mm/hr) 110 110 110 110
Runoff (cum /sec) 0.0650 0.0420 0.0960 0.0098
Total Run Off 0.0650 0.1479 (cum/sec)
Incremental Run off (cum/sec) 0.1479 – 0.0650 = 0.0829
Q1hr = 0.042 × 3600 = 152 m3/hr Considering the first flush loss @ 15% = 23 m3/hr Roof Top Water that is available for harvesting = 152 - 23 = 129 m3/hr
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI Roof Top Runoff directed to 1 No. of Rainwater Sump of capacity 58 KL. Surface runoff is diverted to the percolation pits (15 Nos.) with 1000 mm diameter along the site boundary. However, the exact number of percolation pits shall be validated through a detailed infiltration study prior to commencing work at site.
Figure 5.0: Rain Water Harvesting Pit
WATER BALANCE:
The expected amount of rainwater harvested / recharged over the project area is 60 KL. With the implementation of extensive Rainwater Harvesting and Ground water recharging at site would only have a positive impact on the Ground Water Potential.
10.0 NATURAL DRAINAGE:
The site is a flat terrain as the site is already a developed land. Bay of Bengal on the Eastern Side of the Site at a distance of 80 m. However proper care would be taken during the construction phase by providing mobile toilets and periodic cleaning would be carried out thereby not polluting the surrounding environment. During operational phase the sewage water will be treated through STP in addition a tertiary treatment would be done using Ultra Filtration to ensure the water quality is well within the prescribed norms. With a structured
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI storm water drain and site being in a Master Planned Area, the occurrence / stagnation of flood is not envisaged.
Figure 6.0: Terrain View of the Site
11.0 ENERGY CONSERVATION MEASURES:
LED Lights for all common Areas Solar Power street lighting and common utility points 20 to 30% of hot water demand shall be met through the Solar water heaters. Installation of energy efficient lighting luminaries with three star rated BEE labeled Dimmer control / day light sensors Reuse of water from STP for Flushing and Irrigation application. Variable Voltage Variable Frequency Drive Motors for Lifts LED lamps in all display / exit sign boards Provision of energy meters for energy consuming systems Using paints, adhesives with low or no VOC for all interior walls
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI 12.0 ESTIMATED COST FOR ENVIRONMENTAL MANAGEMENT PLAN:
Table 9.0: Budgetary Allocation
BUDGETRY ALLOCATION (Rs. IN LAKHS) S. No. DESCRIPTION CAPITAL COST O&M COST PER ANNUM BUDGETARY ALLOCATION FOR CONSTRCUTION PHASE
1 Site Sanitation Facilities 86.00 -
A On-Site Sanitation 10.00 -
B Sewer Networks 15.00 -
C Run Off Drains 8.00 -
D Disinfection 3.00 -
E Solid Waste Disposal 50.00 -
2 Health Checkup 5.00 - 3 Environmental Monitoring 10.00 - A Air Monitoring 6.00 - B Water Monitoring 3.00 - C Noise Monitoring 1.00 -
4 Control Measures 48.00 -
A Air Pollution 15.00 - B Water Pollution 10.00 - C Noise Pollution 8.00 - D Soil Pollution 15.00 COST FOR CONSTRUCTION PHASE 149.00 - BUDGETARY ALLOCATION FOR OPERATIONAL PHASE 1 Site Sanitation Facilities 155.00 27.00 A Solid Waste Management 15.00 3.00 B Sewage Treatment Plant 95.00 17.00 Rain Water Harvesting + C 35.00 3.00 Housekeeping Facilities D Non-Biodegradable SWM 10.00 2.00 E Disinfection - 2.00 2 Health Checkup - 3.00 3 Environmental Monitoring - 8.00 A Air Monitoring - 1.50 B Water Monitoring - 1.00 C Noise Monitoring - 0.50 D Stack Monitoring - 5.00 4 Energy Conservation Measures 50.00 10.00 5 Control Measures 60.00 12.00 A Air Pollution 10.00 2.00 B Water Pollution 20.00 4.00 C Noise Pollution 10.00 1.00 D Soil Pollution 5.00 3.00 E Greenbelt Development 15.00 2.00 COST FOR OPERATIONAL PHASE 230.00 60.00
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI 13.0 GREENBELT DEVELOPMENT:
Parks or gardens maintained for recreational and ornamental purposes shall not only improve the current ecology of the proposed site but also aesthetic value in the area. The list of plant species which can be suitably planted and having significant importance are provided in Table 10.0
Table 10.0: Suggested Trees For Green Belt Development
S. No. Scientific Name Standard Name
1 Albizia lebbeck Sirish 2 Azadirachta indica Neem 3 Bauhinia variegata Kanchan 4 Butea monosperma Palash 5 Cassia fistula Amaltas 6 Emblica officinalis Amla 7 Leucaena leucocephala Subabul 8 Mangifera indica Aam 9 Peltophorum pterocarpum Copper pod / Yellow flame tree 10 Pongamia pinnata Karanj
The water required for the landscaped area would be the treated water from STP unit, in addition Ultra Filtration would be provided as a tertiary treatment of the treated sewage to ensure minimal contaminants. The STP is designed to deliver treated water suitable for irrigation / in land surface water discharge norms as prescribed. Suitable watering schemes shall be employed that water will not be allowed to stagnant at any point of time; drip irrigation / sprinklers shall be deployed. Hence effects of leaching would be eradicated.
14.0 SOCIO ECONOMIC DEVELOPMENT PLAN:
The establishment of the proposed residential project at this place will generate direct, indirect and self – employment opportunities in this area and improve their economic position tremendously. The following shall be followed to ensure socio economic development in the project area: Direct / Indirect Employment to the people from nearby areas
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI Quality Residence Proper sanitation facilities shall be provided Facilities including first aid will be provided
15.0 BENEFITS:
Continuation of the projects will have the following benefits. Quality residential development Increased direct & indirect employment for neighborhood inhabitants Increased revenue to the government Improved socio-economics
Over all development of this project will create a positive impact to the community as well as to the surrounding environment thereby ensuring sustainable development and hence the project needs to be continued.
VOORA PROPERTY DEVELOPERS PRIVATE LIMITED, TONDIARPET, CHENNAI