306 kld (Landscaping - 95 kld, Dual Flushing 160 kld, Car Washing - 51 kld) Quantity Of Wastewater Discharge Quantum Of Fresh Water Required 409 kld

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1 DETAILS OF PROJECT The project proponent wants to develop a Residential complex with all modern amenities at Plot no. IIG/7, Action area II, New town, Rajarhat, Kolkata The project site is a flat and well developed land. Total built-up area is sqm on a Land Area of sqm. Land Area 52609sqm Total Built Up Area sqm Ground Coverage sqm (31.26%) Exclusive Tree Plantation Area sqm (22.50%) Total Green Area sqm (28.51%) Total Paved Area sqm (12.47%) Residential Complex Tower A : G+23, Tower B : G+23, Tower C : G+23, No. of storey Tower D : G+29, Tower E : G+29, Tower F : G+29, Tower G : G+27, Town Home & Courtyard home : G+4 Total No. Of Dwelling Units, Nos. 789 Source Of Water NKDA Quantum Of Water Required 715 kld Quantity Of Wastewater Generation 494 kld Treated Wastewater Recycled 306 kld (Landscaping - 95 kld, Dual Flushing 160 kld, Car Washing - 51 kld) Quantity Of Wastewater Discharge 188 kld Quantum Of Fresh Water Required 409 kld Quantity Of Solid Waste Generation 1964 kg/day (operational phase) 256 kg/day (constructional phase) Constructional Phase Water Demand 105 kld (Construction work 16 kld, Workers 89 kld) Total Population During Construction phase 1278 persons Total Population During Operation phase 5442 persons (Per & Tem ) Electricity Demand 5046 KVA Electricity Supplied By WBSEDCL D.G.Sets 2 no KVA & 1 nos. 500 KVA Fuel Required For D.G.Sets 400 litre/hr 6.3 meter stack for 1000 KVA DG & 4.5 meter Stack Height For D.G.Sets stack for each 500 KVA DG set above the roof of the building. Total no. of car parking provided 1286 Nos. Total no. of trees provided, nos. 737 nos. Page 1 of 12

2 Water Supply, Wastewater Generation, Recycling and Discharge Daily water demand of the proposed project during operation phase will be 715 kld, out of the total water demand 409 kld will be the fresh water demand and rest 306 kld (landscaping 95 kld, car washing 51 kld and Flushing 160 kld) will be recycled from treated wastewater. The fresh water will be supplied by NKDA water supply. Wastewater generation from the proposed project will be 494 kld. The wastewater will be collected through a well designed sewer network leading to STP based on FAB technology followed by tertiary system (Pressure Sand Filter - PSF, Activated Carbon Filter - ACF & Disinfection - UV-Radiation) and reused as much possible within the project. RECYCLED : 144 kld Landscaping : 95 kld Flushing : 160 kld Car washing : 51 kld The excess treated wastewater that will be discharged to NKDA drain in front of the project site 110 kld. Flat No. Occu. Rate Total popu. Lpcd Total litre/day Residential Community Hall Gym+Yoga+Massage room Game+Card room+squash court+mini theatre Club Service persons Floating Population kld Sub Total Landscaping 95 Car washing 51 Losses 6 HVAC 10 Sub Total TOTAL WATER REQUIREMENT 715 Total Wastewater Generation 494 Total Wastewater discharge 188 Total Recycling 306 Landscaping 95 Flushing 160 Car washing 51 Fresh Water Requirement 409 OCCUPANCY RATE NBC 2005, PAGE 21, BUILDING SERVICES-SECTION 3 Page 2 of 12

3 WATER BALANCE DIAGRAM FRESH INPUT 409 kld Residentia l = 479 kld Commu nity Hall 3 kld Service 32 kld Game, card, squash, mini theatre 6 kld Club 6 kld Floating Population 5 kld Gym & Yoga + massage 2 kld Swim. Pool 10 kld Losses 6 kld 12 WASTEWATER GENERATED 494 kld CAR WASHING 51 kld RECYCLED 211 kld RECYCLED DUAL FLUSHING 160 kld TREATED WASTEWATER GENERATED 494 kld RECYCLED 95 kld LANDSCAPING 95 kld TREATED WASTEWATER DISCHARGE 188 kld Page 3 of 12

4 Municipal Solid Waste Generation and Its Management Garbage will be treated at source for biodegradable, recyclables and inert material during construction (256 kg/day) ( kg/day) and operational phases (1040 kg/day). Organic portion (about 50% of total quantity) will be treated in-house by installing mechanical composter, In-organic recyclables will be sold to the vendor and in-organic inert material will be disposed off in SLF by Project proponent in association with WBHIDCO as per the guideline given by SEAC/SEIAA/WBPCB for management. Person Rate kg/day Total kg/day Residential Commercial Gym+Yoga+Massage room Game+Card room+squash court+mini theatre Club Floating Population Service Street Sweeping GRAND TOTAL 1964 MUNICIPAL SOLID WASTE MANAGEMENT PROPOSAL AT PROJECT SITE Solid waste to be generated in the project = 1040 kg/day Storage and Segregation of waste Biodegradable solid waste generated will be segregated at site. Biodegradable part will be treated by installing mechanical composter to produce manure. Non biodegradable recycles will be sold to the vendor. The general characteristics of solid waste generated from the complex indicate organic part as 50%, inorganic recyclables as 15% & inorganic inert material as 35%. Volume required for Solid Waste segregation for the entire 300 kg / cum = 6.55 cum Considering Storage depth = 0.5 m Area required for Solid Waste segregation for the entire project = (6.55/0.5) = sqm Say total segregation area = 13 sqm Adding additional 30% area for movement, etc. Page 4 of 12

5 Total area for storage and segregation of waste = sqm 17 sqm Organic waste management Mechanical composter will be installed for converting organic solid waste to organic manure (technology approved by WBPCB). Organic waste generated = 982 kg/day. Requirement of area for composting (100 kg/day/sqm) = 9.82 sqm Storage area for compost (50%) = 9.82 sqm Adding additional 30% area for pathway etc, Total area requirement for organic waste composting = ( ) 1.3 = sqm = 26 sqm (approx) Inorganic waste management The inorganic recyclable waste generated = 15% of 1964 kg/day = kg/day The recyclable waste will be disposed off in regular manner. Secured Landfilling The non-recyclable inorganic (inert material) and rejects from compost unit will be transported for disposal in secured land filling site which will be operated and maintained by Kamarhati Municipality in association with project authorities. Quantity of non-recyclable inorganic and rejects from composting = 35% of 1964 kg/day+ 10% of 982 kg/day = ( ) kg/day = kg/day. The inorganic inert waste transported to secured landfill site of the NKDA = kg/day Sl. No. Component Area (sqm) 1 Storage and Segregation Organic waste Composting 26.0 TOTAL 43.0 An area of 43.0 sqm is earmarked for onsite MSW management. Page 5 of 12

6 Storm Water Management The surrounding area is predominantly residential area. The net land area of the proposed project is sqm. By applying rational formula the peak rate of storm runoff considering 12 mm/hr rainfall is given below. Total land area = sqm = 5.26 ha. By applying rational method, the peak rate of run-off = 10 x 0.60 x 12 x 5.26 cum. /hr. = cum/hr. = cum/sec. Velocity through pipe is 1.0 m/sec (non scouring and non silting). The required diameter of pipe is 366 mm. The storm drains of the complex will collect and convey the rainwater into the adjacent NKDA drain. The internal drainage system will be designed considering the invert level of the NKDA drain (outfall) in-front of the project site to avoid any flooding or water logging in the site. RAIN WATER HARVESTING The total roof area is about sqm. The SEAC guideline regarding rain water harvesting is as follows - Sl. No. Category of Building Minimum percentage of rain water which should harvested by Surface Storage Sub-surface Recharge 1 10 to 15 storied Building & Above 40% 60% 2 6 to 10 storied Building 35% 45% 3 3 to 5 storied Building 25% 15% (recharge or additional storage) 4 Less than three storied Building 10% 10% Note While suggesting the guidelines, RWH potential in 1000 sqm Roof Area was considered to be 7, 68,000 liters annually based on the rainfall characteristics. Uniform utilization of harvested rainwater throughout the year from created storage tank was also considered. Based on the above consideration, the storage facility to be created from 1000 sqm roof area for Sl. No. 1,2, 3 were thought to be 3 lakh litre, 2.5 lakh litre and 1.5 lakh liters respectively. As per SEAC proposed guidelines the rain water harvesting potential is calculated in the following Table: Page 6 of 12

7 DETAILS Tower A, B, C, D, E, F, G Town home and Country yard home NO. OF STORY G + 23 and above ROOF AREA, SQM TOTAL RAIN WATER POTENTIAL, lakh litre MINIMUM PERCENTAGE OF RAIN WATER WHICH SHOULD HARVESTED BY STORAGE (%) SUB- RECHARGE (%) RAIN WATER HARVESTING POTENTIAL AS PER SEAC GUIDELINES STORAGE, lakh litre SUB- RECHARGE, lakh litre G Total TOTAL As per SEAC proposed guidelines of storage facilities and sub-surface recharging facilities required will be lakh liters and lakh liters respectively. Total volume of rooftop rainwater to be harvested as per SEAC guideline is lakh litres i.e cum. We are proposing 2 nos. storage tank of 100 cum capacity each i.e. 200 cum (total) for rooftop rainwater storage. Rest ( lakh litre i.e cum) will be recharged through 2 nos. recharge tubewell of each 150 mm diameter. Considering 81 days rainfall in a year, per day average rain water available is cum/day. Per day average rainfall available for recharge for each recharge structure = /2 = cum/day. All rooftop rain water will be diverted to the rainwater storage tank of 200 cum capacity (100 cum * 2 nos.) and overflow of the tank will be diverted to recharge structure and overflow of the recharge structure will be diverted to storm water drain within the campus. From the local survey/the agencies working for doing borewells, it is observed that there are prominent sand layers (aquifer) in the 70.0 to meter zone. We are proposing to install our strainer in between 80 to 98 meter zone. The quantity of Recharge, Q can be calculated through the following formula for Aquifer: Q = [2(22/7) * T *(H-h)] /[2.3 log 10(R/r)] Where, K= Permeability Coefficient is 5 cum/day/sqm, considering fine sand b = Average height of Aquifer = 18 meter, T= Tansmissibility of the aquifer = K * b H=Initial artesian pressure at the bottom of the aquifer h=artesian pressure in the well, (H-h) = Draw down =1.0 meter, R = 200 meter r =Radius of well = 150mm = 0.15 M Therefore, Total recharging capacity from 1 nos. 150 mm diameter tubewells is given below Q= [2X (22/7) X 5 X 18] / [{2.3 Log 10 (200/0.15)}] = ( / 7.2) Cum/Day Page 7 of 12

8 = cum /Day We are proposing 2 nos. of 150 mm diameter tubewells for recharging. Average Capacity of recharging through 2 nos. tubewells is = * 2 = cum/day, whereas average requirement is cum/day. Average Capacity of recharging through 1 no. tubewell is = cum/day, whereas average requirement for each recharge structure is cum/day. Hence OK CHECK FOR RECHARGE STRUCTURE Details Tower A, B, C, D, E, F, G Town home and Country yard home Roof Area, Sqm Annual Rainfall, meter Total Potential of rainwater per Annum, cum Total Potential of rainwater per Annum, lakh litre Per day average rainwater available considering 81 rainy days in a year, cum/day TOTAL BLOCK TYPE Tower A, B, C, D, E, F, G Town home and Country yard home NO. OF STORY G + 23 and above ROOF AREA, SQM TOTAL RAIN WATER POTENTI ALlakh litre MINIMUM PERCENTAGE OF RAIN WATER WHICH SHOULD HARVESTED BY STORAG (%) Runoff Coefficient SUB- RECHAR (%) RAIN WATER HARVESTING POTENTIAL AS PER SEAC GUIDELINES STORAGE, lakh litre SUB- RECHARGE, lakh litre G TOTAL TOTAL We are proposing 2 nos. storage tank of 100 cum capacity each i.e. 200 cum (total) for rooftop rainwater storage. Rest ( lakh litre i.e cum) will be recharged through 2 nos. recharge tubewell of each 150 mm diameter. Considering 81 days rainfall in a year, per day average rain water available is cum/day. Per day average rainfall available for recharge for each recharge structure = /2 = cum/day. Page 8 of 12

9 We are providing 2 nos. of storage tanks. Each Tank volume required = /2 cum = cum. We are providing Length 6 meter, Width 4 meter and Effective Depth 3 meter, Total Volume Provided 72 cum. Overflow of the recharge structure will be diverted to the storm water line in the project area. STORAGE TANK 2 NOS. 2 FINALLY TO WBHIDCO DRAIN Page 9 of 12

10 RECHARGE STRUCTURE R.C.C. SLAB 500 Ø COVER PLUG 500 Ø COVER GROUND LEVEL INPUT STEP 300 OVERFLOW 300 GROUND LEVEL PIT LENGTH - E WIDTH - F 2000 LEGEND MESH MESH COARSE SAND GRAVEL GRAVEL 3-5 mm SLOTTED PIPE mm 5-10 mm mm A : 12 Mt. B : 102 Mt. C : 1 Mt. D : Mt Mt. E : 4.5 Mt. F : 4 Mt. EFFECTIVE DEPTH : 23 Mt. EFFECTIVE VOLUME = 4.5*4*2 6 x 4 x 3 = 7236 cum CUM PIPE DIAMETER "D" "B" STRAINER "A" PLUG "C" RECHARGE STRUCTURE Page 10 of 12

11 Electricity, DG sets, Stack height Electricity will be supplied by WBSEDCL. The Electrical load will be about 2700 KVA. DG sets - 2 no KVA & 1 nos. 500 KVA each is proposed. The emission from DG sets will be discharged through 6.3 meter stack for 1000 KVA DG set & 4.5 m stack for each 500 KVA DG set above the roof of the building. Fuel required for DG sets will be about 400 litre/hr. TREE PLANTATION DETAILS SL. NO. SCIENTIFIC NAME COMMON NAME QUANTITY 1 Terminalia catappa Badam 16 2 Peltophorum pterocarpum Radhachura 20 3 Spathodea campanulata African Tulip Tree 26 4 Tabebuia rosea Rosy Trumpet Tree 28 5 Acacia auriculiformis Akashmoni 20 6 Azadirachta indica Neem Tree 50 7 Cassia fistula Amaltash 40 8 Aegle marmelos Bael 20 9 Cocos nucifera 'NARIEL'(tall variety) Coconut Palm Livistona chinensis Chinese Fan Palm Ficus lyrata Fiddle Leaf Fig 8 12 Ficus aurea Golden Fig Tree 8 13 Anthocephalus chinensis Kadamba Tree Lagerstroemia thorelli Pride Of India Thevetia peruviana Yellow Oleander Trema orientalis Pigeon Wood Tecoma castanifolia Trumpetbush Syzygium jambos Plum Rose Psidium guajava Guava Phyllanthus emblica Amla Litchi chinensis Litchu Erythrina 'variegata' Indian Coral Tree Cassia javanica Pink Cassia Delonix regia Gulmohur Lagerstroemia speciosa Jarul Artocarpus heterophyllus Kanthal Schleichera oleosa Kusum Mangifera indica var. 'MULLICA' Mango Ficus benjamina Banyan 2 Page 11 of 12

12 30 Mimusops elengi Indian Medlar Tree Syzygium cumini Jamun 30 TOTAL 737 Fire Fighting There will be all provisions as per NBC-2005 of fire fighting for the given height of the building. Clearance from WBFES will be obtained. Others There will be adequate car parking for the owners and provision for visitor s car park. Page 12 of 12