DETAILS OF PROJECT The project proponent wants to develop a Residential Building with all modern amenities Premises No. 116, Roy Bahadur Road (previously known as 352, Roy Bahadur Road), Kolkata - 700053 The project site is a flat and well developed land. Total built-up area is 49760.05 sqm. Total land area 16817.87 sqm. Land Area 16817.87 sqm. Net Land Area 16580.69 sqm. Total Built Up Area 49760.05 sqm Ground Coverage 4020.70 sqm (23.91%) Exclusive Tree Plantation Area 3669.83 sqm (21.82%) Total Green Area 7870.92 sqm (46.80%) Total Paved Area 4201.09 sqm (24.98%) Residential Building Tower 1 G+20 No. of storey Tower 2 G+20 Tower 3 G+20 Tower 4 G+20 Tower 5 G+21 Total No. Of Dwelling Units, Nos. 325 Source Of Water KMC Quantum Of Water Required 339 kld Quantity Of Wastewater Generation 239 kld Treated Wastewater Recycled 123 kld (Landscaping - 31 kld, Dual Flushing 73 kld Car Washing - 19 kld) Quantity Of Wastewater Discharge 116 kld Quantum Of Fresh Water Required 2164 kld Quantity Of Solid Waste Generation 1135 kg/day (operational phase) 81 kg/day (constructional phase) Constructional Phase Water Demand 34 kld (Construction work 5 kld, Workers 29 kld) Total Population During Construction phase 405 persons Total Population During Operation phase 2435 persons (Per. 1625 & Temp. - 810) Electricity Demand 2105 KVA Electricity Supplied By CESC D.G.Sets 1 no 150 kva & 2 nos 1000 kva Fuel Required For D.G.Sets 344 litre/hr 2.4 meter stack for 150 KVA DG & 6.3 meter stack Stack Height For D.G.Sets for each 1000 KVA DG set above the roof of the building. Total no. of car parking provided 473 Nos. Existing 38 nos. of trees, trees felled 25 nos., Total no. of trees provided, nos. retained trees 13 nos., compensatory plantation 25x5 = 125 nos., proposed 240 nos. of trees. Total 378 nos. of trees. Page 1 of 11
Water Supply, Wastewater Generation, Recycling and Discharge Daily water demand of the proposed project during operation phase will be 339 kld, out of the total water demand 216 kld will be the fresh water demand and rest 123 kld (landscaping 31 kld, car washing 19 kld and Flushing 73 kld) will be recycled from treated wastewater. The fresh water will be supplied by KMC water supply. Wastewater generation from the proposed project will be 239 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 : 123 kld Landscaping : 31 kld Flushing : 73 kld Car washing : 19 kld The excess treated wastewater that will be discharged to KMC drain in front of the project site 116 kld. Flat No. Occu. Rate Total popu. Lpcd Total litre/day kld Residential 325 5 1625 150 243750 244 Multi Purpose Hall + Prefunction Room + Party Hall Building Office + Home Theatre + Lounge 146 45 6570 7 95 45 4275 4 Spa + Massage Room 23 45 1035 1 Gym + Games Room 58 45 2610 3 Service persons 325 45 14625 15 Floating Population 163 15 2445 2 Sub Total 1 276 Landscaping 31 Car washing 19 Losses 3 Swimming pool 10 Sub Total 2 63 TOTAL WATER REQUIREMENT 339 Total Wastewater Generation 239 Total Wastewater discharge 116 Total Recycling 123 Landscaping 31 Flushing 73 Car washing 19 Fresh Water Requirement 216 OCCUPANCY RATE AS PER NBC 2005, PART 9, PAGE 20, PARA 4.3.1.1 Page 2 of 11
WATER BALANCE DIAGRAM FRESH INPUT 216 kld Flat 244 kld, Fresh water 171 kld, Recycling 73 kld Multi Purpose Hall + Prefunction Room + Party Hall: 7 kld Building Office + Home Theatre + Lounge: 4 kld Spa + Massage Room: 1 kld Gym + Games Room : 3 kld Service Person 15 kld Floating Population 2 kld Swimming Pool 10 KLD Loss 3 KLD Dual Flushing 73 kld WASTEWATER GENERATED 239 kld Car Washing 19 kld Recycled 73 kld Recycled 19 kld TREATED WASTEWATER GENERATED 239 kld TREATED WASTEWATER DISCHARGE 116 kld Recycled 31 kld Landscaping 31 kld Page 3 of 11
Municipal Solid Waste Generation and Its Management Garbage will be treated at source for biodegradable, recyclables and inert material during construction (81 kg/day) (405 persons @ 0.2 kg/day) and operational phases (1135 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 KMC as per the guideline given by SEAC/SEIAA/WBPCB for management. Person Rate Total kg/day kg/day Residential 1625 0.60 975.00 Multi Purpose Hall + Prefunction Room + Party Hall 146 0.15 21.90 Building Office + Home Theatre + Lounge 95 0.15 14.25 Spa + Massage Room 23 0.15 3.45 Gym + Games Room 58 0.15 8.70 Service persons 325 0.10 32.50 Floating Population 163 0.10 16.30 Street Sweeping 2435 0.025 60.88 GRAND TOTAL 1133.0 Say 1135 MUNICIPAL SOLID WASTE MANAGEMENT PROPOSAL AT PROJECT SITE Solid waste to be generated in the project = 1135 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 project @ 200 kg/cum = 5.675 cum Considering Storage depth = 0.5 m Area required for Solid Waste segregation for the entire project = (5.675/0.5) = 11.35 sqm Say total segregation area = 2.0 times of 11.35 sqm = 22.70 sqm Adding additional 20% area for movement, etc. Page 4 of 11
Total area for storage and segregation of waste = 27.24 sqm Organic waste management We will install package plant for converting organic solid waste to compost (technology approved by WBPCB) Organic waste generated = 567.5 kg/day Requirement of area for composting (50 kg/day/sqm) = 11.35 sqm Storage area for compost (50%) = 5.675 sqm Adding additional 20% area for pathway etc, Total area requirement for organic waste composting = 11.35 + 5.675 + 20% X (11.35 + 5.675) = 20.43 sqm Inorganic waste management The inorganic recyclable waste generated = 15% of 1135 kg/day = 170.25 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 KMC in association with project authorities. Quantity of non-recyclable inorganic and rejects from composting = 35% of 1135 kg/day+ 10% of 567.5 kg/day = (397.25 + 56.75) kg/day = 454 kg/day The inorganic inert waste transported to secured landfill site of the KMC = 454 kg/day Sl. No. Component Area (sqm) 1 Storage and Segregation 27.24 2 Organic waste Composting 20.43 TOTAL 47.67 SAY 48 Total inorganic Inert waste to be disposed of in secured landfill site of KMC = 454 kg /day Page 5 of 11
Storm Water Management The surrounding area is predominantly residential area. The land area of the proposed project is 16817.87 sqm. By applying rational formula the peak rate of storm runoff considering 12 mm/hr rainfall is given below. Total land area = 16817.87 sqm = 1.68 ha. By applying rational method, the peak rate of run-off = 10 x 0.60 x 12 x 1.68 cum. /hr. = 121.09 cum/hr. = 0.0336 cum/sec. Velocity through pipe is 1.0 m/sec (non scouring and non silting). The required diameter of pipe is 207 mm The storm drains of the complex will collect and convey the rainwater into the adjacent KMC drain. The internal drainage system will be designed considering the invert level of the KMC 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 4020.70 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 11 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 11
DETAILS Tower 1, Tower 2, Tower 3, Tower 4 NO. OF STORY G + 20 Tower 5 G + 21 ROOF AREA, SQM TOTAL RAIN WATER POTENTIA L, lakh litre MINIMUM PERCENTAGE OF RAIN WATER WHICH SHOULD HARVESTED BY SURFAC E STORAG E (%) SUB- RECHARG E (%) RAIN WATER HARVESTING POTENTIAL AS PER SEAC GUIDELINES STORAG E, lakh litre SUB- RECHARG E, lakh litre 4020.7 30.88 40 60 12.35 18.53 Total 4020.7 30.88 12.35 18.53 TOTAL 30.88 As per SEAC proposed guidelines of storage facilities and sub-surface recharging facilities required will be 12.35 lakh liters and 18.53 lakh liters respectively. Total volume of roof top rainwater to be harvested as per SEAC guideline is 30.88 lakh litres i.e. 3088 cum. We are proposing 2 no. storage tanks of 100 cum capacity each for roof top rainwater storage. Rest (28.88 lakh litre i.e. 2888 cum) will be recharged through 2 nos. recharge tubewell of 150 mm diameter each. Considering 81 days rainfall in a year, per day average rain water available is 35.65 cum/day. Per day rainwater available for recharge for each recharge structure = 35.65/2 = 17.83 cum/day. All rooftop rain water will be diverted to the rainwater storage tank of 200 cum (i.e. 100*2) capacity and overflow of the tank will be diverted to recharge structure and overflow of the recharge structure will be diverted to the 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 (confined aquifer) in the 53.0 to 144.0 meter zone. We are proposing to install our strainer in between 90 to 102 meter zone. The quantity of Recharge, Q can be calculated through the following formula for confined 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 Confined Aquifer = 12 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 Page 7 of 11
r =Radius of well = 150mm = 0.15 M Therefore, Total recharging capacity from 1 no. 150 mm diameter tubewells is given below Q= [2X (22/7) X 5 X 12] / [{2.3 Log 10 (200/0.15)}] = (377.14 / 7.2) Cum/Day = 52.38 cum /Day Per day average roof top rainwater available for recharging is 35.65 cum. We are proposing 2 nos. of 150 mm diameter tube well for recharging. Average Capacity of recharging through 2 nos. of tubewells is = 52.38*2 = 104.76 cum/day and our average requirement is 35.65 cum/day Average Capacity of recharging through 1 no. tube well is = 52.38 cum/day and our average requirement for each recharge tube well is 17.83 cum/day Hence OK CHECK FOR RECHARGE STRUCTURE Details Tower 1, Tower 2, Tower 3, Tower 4 Tower 5 Roof Area, Sqm Runoff Coefficient 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 4020.7 0.95 1.5 5729.50 57.29 70.73 TOTAL 4020.700 5729.50 57.29 70.73 Page 8 of 11
BLOCK TYPE Tower 1, Tower 2, Tower 3, Tower 4 NO. OF STORY G + 20 Tower 5 G + 21 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 4020.7 57.29 40 60 22.92 34.38 TOTAL 4020.70 57.29 22.92 34.38 TOTAL 57.29 We are proposing 2 no. of storage tank of 100 cum capacity for rooftop rainwater storage. Rest (55.29 lakh litre i.e. 5529 cum) will be recharged through 2 nos. recharge tube well of 150 mm diameter each. Considering 81 days rainfall in a year, per day average rainwater available for recharge is = 68.26 cum/day. Per day average rainfall available for recharge for each recharge structure = 68.26/2 = 34.14 cum/day. Each Tank volume required = 34.14 cum/day. Each tank volume provided : Length 6 meter, Width 3 meter and Effective Depth 2 meter, Total Volume Provided 36 cum. Overflow of the recharge structure will be diverted to the storm water line in the project area which leads to the KMC drain. STORAGE TANK 2 NOS. 2 FINALLY TO KMC DRAIN Page 9 of 11
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 300 300 300 1.5-2.0 mm 5-10 mm 10-20 mm A : 12 Mt. B : 102 Mt. C : 1 Mt. D : 0.15 Mt. E : 6 Mt. F : 3 Mt. EFFECTIVE DEPTH : 2 Mt. EFFECTIVE VOLUME = 6*3*2 = 36 CUM PIPE DIAMETER "D" "B" STRAINER "A" PLUG "C" RECHARGE STRUCTURE Page 10 of 11
Electricity, DG sets, Stack height Electricity will be supplied by CESC. The Electrical load will be about 2105 KVA. DG sets - 1 no. 150 KVA & 2 nos. 1000 KVA each is proposed. The emission from DG sets will be discharged through 2.4 meter stack for 150 KVA DG set & 6.3 m stack for each 1000 KVA DG set above the roof of the building. Fuel required for DG sets will be about 344 litre/hr. TREE PLANTATION DETAILS Existing trees = 38 Nos. Trees Felled = 25 Nos. Trees planted against the trees felled = 25x5 = 125 Nos. Trees Retained = 13 Nos. LIST OF TREES PROPOSED FOR PLANTATION SL. NO. BOTANICAL NAME COMMON NAME QUANTITY 1 Peltophorum pterocarpum Radhachura 20 2 Acacia auriculiformis Akashmoni 20 3 Azadirachta indica Neem tree 20 4 Delonix regia Gulmohor 25 5 Lagerstroemia speciosa Jarul 20 6 Artocarpus heterophyllus Kanthal 20 7 Schleichera oleosa Kusum 20 8 Syzigium cumini Jamun 20 9 Polyalthia longifolia Debdaru 25 10 Terminalia arjuna Arjuna 20 11 Mimusops elengi Bakul 30 Total tree for plantation 240 Total nos. of trees = ( 13 + 125 + 240 ) = 378 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 11 of 11