1 DETAILED PROJECT REPORT FOR SETTING UP OF THE PROPOSED NEW HAJ TOWER COMPLEX AT RAJARHAT, KOLKATA Project Implementation Authority HOOGHLY RIVER BRIDGE COMMISSIONERS Consultants
20 Contents 1.0 INTRODUCTION Aim-Objective & of the Proposed Project CONCEPTUAL MASTER PLAN Project Location Design Concept Built Up Area ARCHITECTURAL PLANNING Floor wise Facilities Schedule of Finishes DESIGN CONCEPT Brief Description of the Building Structural System Method of design Foundation System Load BASIC INFRASTRUCTURE Electrical Distribution System Electrical Design Basis Substation Arrangement Design Details Equipment Details HVAC System General Design Basis Air-conditioning System... Error! Bookmark not defined. 5.3 Water Supply... 21
21 5.3.1 Source Demand Assessment Distribution System Sewerage & Drainage System Sewerage Quantity Assessment Sewerage System Internal Sanitation Drainage System Rainwater Harvesting Roof top Rain water Harvesting: Natural Recharge from Open Areas Surface Run off from paved plaza and parking spaceserror! Bookmark not defined Artificial Recharge Design of infiltration system Fire Fighting Measures PROJECT COST Detailed Estimates Drawings
22 1.0 INTRODUCTION Haj is a pilgrimage to Mecca. It is the largest annual pilgrimage in the world. It is the fifth pillar of Islam, an obligation that must be carried out at least once in their lifetime by every able-bodied Muslim who can afford to do so. It is a demonstration of the solidarity of the Muslim people, and their submission to Allah. The pilgrimage occurs from the 10th to the 15th day of Dhu al-hijjah, the 12th month of the Islamic calendar. Because the Islamic calendar is a lunar calendar, eleven days shorter than the Gregorian calendar used in the Western world, the Gregorian date of the Hajj is eleven days earlier from year to year. In 2007, the Haj was from December 17 to December 21; in 2008 from the first week of December. If on the Haj, a female must be accompanied by her husband or a member of her family. The Minority Affairs and Madrasah Education Department, Government of West Bengal & West Bengal State Haj Committee has decided to establish a New Haj Tower Complex at Rajarhat to assist the numerous Hajis going every year through Kolkata for pilgrimage to Mecca. 1.1 Aim-Objective & of the Proposed Project The Minority Affairs and Madrasah Education Department, Government of West Bengal & West Bengal State Haj Committee has decided to establish a New Haj Tower Complex at New Town, Rajarhat to assist the numerous Hajis going every year through Kolkata for pilgrimage to Mecca.
23 2.0 CONCEPTUAL MASTER PLAN Government of West Bengal has allotted a land area of more or less 5.0 acres at New Town, Rajarhat for construction of the New Haj Tower Complex. The proposed complex to have a multistoried Haj Tower Building, auditorium of 1200 capacity and a prayer Hall, wuddukhana along with internal road network, car and bus parking area, landscaping and other basic amenities. 2.1 Project Location The proposed project site is situated in New Town, Kolkata, Action Area IIA (Plot No. IIA/26). The proposed plot is shown below (marked in red). The average geographical position is 22 o 35 latitude North of and 88 o 29 longitude East. Proposed Location of Haj Tower Complex at New Town - Rajarhat, Kolkata A location Map showing the details of the plot is also attached at the end of this report. 2.2 Design Concept The fundamental design of the Haj Tower Building has been carried out as a multistoried tower block of Basement + Ground + 12 floors along with an auditorium of 1200 capacity and a prayer Hall of Ground + 3 storied. However as per the present proposal the development area has been restricted to Basement + Ground + 10 Floors with provision in foundation for increasing by another 2 floors, auditorium of 1200 capacity and a Ground + 1 Floor Prayer Hall with provision in foundation for increasing by another 2 floors as per the following details.
24 2.3 Built Up Area The main building for the New Haj Tower Complex has been proposed as a single B+G+10Tower with two more floor as future expansion. There will be separate (G+3) storied Prayer Hall within the compound and an Auditorium of 1200 capacity. Sufficient parking areas for Buses and cars have been provided. Floor Built Up Area Height Ground Coverage (sqm) (mtr.) Tower (B + G + 10) with future provision for another two additional floors Basement Ground Floor First Floor nd to 12 th Floor ( sqm/floor) Total for Main Tower Building (246646Sqft) (Plinth) sqm Toilets & Wadukhana sqm Utility Block Auditorium (1200 capacity) sqm Two Storied Prayer Hall at G & sqm 4.2 at 1 st.
25 3.0 ARCHITECTURAL PLANNING The facilities planned in each floor are given below: 3.1 Floor wise Facilities Main Haj Tower Building Basement Exclusively for Car Parking and utilities Ground Floor Dining Hall Kitchen, pantry & store Washing area Separate Toilets for Ladies & Gents Documents issue counters 14 nos. Entrance Lobby & lounge with reception Departure Lounge Information & Enquiry Separate Lift Lobbies for Ladies & Gents First Floor Executive Chambers 6 Nos. and staff area Chairman s Chamber with visitor lounge, PA s office, chairman s office Conference Hall for 50 persons Document issue counters 14 nos. Second to Tenth Floor Ladies Dormitories for 110 persons per floor Gents Dormitories for 190 persons per floor Toilet for Gents & Ladies Wudukhana Store Rooms 2 nos. per Floor The total accommodation as per the present proposal thus works out to (110 x 8 floors) 880 Ladies and (190 x 8 floors) 1520 Gents i.e. total 2400.
26 A Two storied Prayer Hall (with a provision of extension by another two floors) (Reference Minutes of Meeting dated ) has also been proposed within the compound. The facilities considered within the Prayer Hall area shall be follows: Separate prayer areas for Gents & Ladies Separate Toilet & Wudukhana for Gents & Ladies An auditorium having capacity of 900 at ground floor and 300 at balcony area Additional special features include the following: Parking facility for 10 buses Surface Car parking facility Separate entry & exit at Ground floor for office and residential areas 3.2 Schedule of Finishes 1 INTERNAL Flooring Kota Stone A) DORMITORIES (2 nd to 10th Floor) Skirting Walls 100mm high kota P.O.P. with plastic emulsion paint Ceiling P.O.p. with plastic emulsion paint B) REGISTRATION COUNTERS & LOBBIES (1 st Floor) Flooring Marble Skirting 100mm high marble Walls P.O.p. with plastic emulsion paint Ceiling FALSE CEILING C) TOILETS Flooring 10mm thick vitrified tiles, matt finish Dado 7-8mm thick 2100 mm high ceramic glazed tiles of size 600 x 300mm Walls Plastic emulsion paint over P.O.P.
27 Ceiling Acrylic color distemper over P.O.P. Toilet internal partition for W.C's Merino-besco' solid compact prelaminated board panels 12mm thick dry based melamine coated fixed with anodised aluminium u channels, rials etc. Flooring Marble D) CORRIDORS AND LOBBIES Skirting Dado Ceiling 100mm high marble P.O.P. with plastic emulsion paint P.O.P. with plastic emulsion paint E) CONFERENCE HALL / EXECUTIVE OFFICE / CHAIRMAN S ROOM AND OFFICE / DEPARTURE LOUNGE / DINING / KITCHEN Flooring Skirting Walls 10mm vitrified Tiles 100mm high vitrified tiles P.O.P. with acrylic emulsion paint False Ceiling Gypsum board false ceiling at 3.00m height Flooring Granite slab prepolished to mirror finish F) GROUND FLOOR ENTRANCE LOBBY AND LOUNGE Skirting Walls 150mm high granite P.O.P. with textured paint Ceiling P.O.P. with plastic emulsion paint Treads & Landing Kotah stone slab, size 1000 x 600mm & 1000 x 300mm Risers Kotah stone G) STAIR Skirting 150mm high Abu White Marble Walls Acrylic distemper over cement plaster Railings 50mm dia M.S. tube over M.S. balusters
28 H) LIFT WALL FACIA, JAMS Dado 2400mm high mirror polished Granite dado with slabs Flooring Cement concrete flooring Skirting 150mm high cement concrete J) UTILITY ROOMS Walls Ceiling Acrylic Distemper over cement plaster Acrylic Distemper over cement plaster K) BASEMENT Flooring 52mm thick cement concrete flooring with 12mm thick hardener topping Skirting 300mm high cement punning Walls White wash. Flooring Cement Concrete L) AUDITORIUM Skirting Walls False Ceiling Stage Flooring Cement Concrete Acoustical panel Acoustical false ceiling Laminated wooden flooring Flooring Marble M) PRAYER HALL Skirting Walls Ceiling Marble Acrylic Distemper over cement plaster Acrylic Distemper over cement plaster 2 EXTERNAL a) Exterior grade Textured paint over cement primer.
29 b) 'SHON' MOSAIC TILES as per elevation treatment. c) GLASS MOSAIC TILES as per elevation treatment. d) Granite cladding as per elevation treatment. e) Structural glazing as per elevation. 3 ROOF SIKA TOP SEAL ACRYLIC POLYMER BASE CEMENTITIONS WATER PROOFING over SIKA LATEX surface preparation and finished with average 75 mm. thick cement concrete grading to the required slope. 4 BASEMENT WATER PROOFING FOR RAFTS & WALLS 2 mm. thick plasticised PVC synthetic membrane over 50 mm. thick PCC float membrane over 500 gsm geotextile layer with necessary compartmentalising by using PVC water stops and pressure grouting wherever necessary.
30 4.0 DESIGN CONCEPT 4.1 Brief Description of the Building Sl. No. Description No. of Storey as per Total Planning 1 Main Tower Block 2 Auditorium 3 Prayer Hall B + G + 10 (Provision in foundation for 2 additional floors) 1200 capacity (900 in ground floor in Balcony) G+1 (Provision in foundation for 2 additional floors) 4 Wuddukhana G 4.2 Structural System The building is analyzed as special RC moment resisting space frame with horizontal diaphragms at each floor levels for various loads and load combinations. Reinforcement : High yield strength deformed bars of grade Fe 500D (Conforming to IS 1786: 2008) Grade of Concrete M40 for columns, M35 for piles and M30 for beams, slabs, pile caps, lift, stair, basement raft, basement walls etc Method of design The design will be based on: Limit state method for RC structures. Clear cover to main reinforcement & minimum dimensions Footings Pile & Pile cap Columns Beams Floor slab Retaining wall : 50mm : 50mm : 40 mm, 300 mm : 30 mm, 200 mm : 20 mm, 125 mm : 40 mm, 160 mm
31 The structural Analysis has been done using STAAD.Pro v8i 4.4 Foundation System The Main Tower Block along shall be founded on 800 mm diameter of piles whereas the Auditorium and Prayer Hall shall be founded on 500 mm diameter piles. The Basement shall be designed as a raft resting on piles. The load capacities of piles s per Soil Investigation Report is given below. Dia of Pile (mm) Cut off Level (C.O.L.) below EGL in m Pile Tip Level below EGL in m Pile Shaft Length (m) Type of Pile Bored Cast-in-situ Safe Vertical Load Capacity Under compression (ton) Safe Horizontal Load Capacity (ton) Bored Cast-in-situ NOTE: Above pile capacities are tentative.these shall be ratified at field by proper load tests as per IS: 2911 (Part IV) Load Earthquake Load Zone : IV Z Factor : 0.24 I Facto r : 1.5 R factor : 5.0 (special moment resisting frame) Damping : 5% (RC building) Design Live Load : 50 % Base Shear (V b ) : A h* W, Where A h : Z/2*S a /g* I/R Fundamental Natural Period (T a ) : T a = 0.075*h 0.75
32 (RC frame building without brick infill panels) W : Seismic Weight as per cl.7.4 Lateral Force Q i : As per Clause Static Eccentricity e x /e z : As per Clause 7.9 Point of Application : Center of Mass Increase in SBC : 25% (soft soils) N <10 Reference Indian Standards IS 875 (Part 1 to 3 & 5) : 1987 : Loads IS 456 : 2000 : RC Design IS 1786: 2008 : Reinf. IS 1893 (Part 1) : 2002 : Earthquake Load IS : 1993 : Ductile Detailing SP 16 : 1980 : RC Design SP 34 : 1987 : Reinforcement Detailing
33 5.0 BASIC INFRASTRUCTURE The basic infrastructure services have been designed to cater to the development and are stated below. 5.1 Electrical Distribution System The proposed Haj Tower Complex at New Town, Kolkata falls under the jurisdiction of a joint venture company between WBSEB & WBHIDCO. This joint venture company, NEW TOWN ELECTRIC SUPPLY COMPANY, (NTESC) is entrusted with the arrangement of power supply and distribution of the same in the New Town area. The project will receive 11kV HT power from NEW TOWN ELECTRIC SUPPLY COMPANY, (NTESC). Power will be tapped from nearest NTESC substation and will reach site through 11kV HT XLPE cable. A 11kV HT breaker of NTESC will receive the 11kV power. It will further distribute through a 2panel HT breaker arrangement of Haj Tower Complex and 1nos. 1400KVA 11/0.415kV transformer. The LT distribution will be through the main LT panel. From the main LT panel power will be distributed to the buildings through aluminium XLPE Cable to different PDBs and LDBs Electrical Design Basis Tentative Electrical load calculation is based on area statement. It is provided as below: ELECTRICAL LOAD CHART OF HAJ TOWER COMPLEX SL.No. LOCATION AREA LIGHTING LOAD POWER LOAD AC LOAD TOTAL LOAD 1 BASEMENT GR. FLOOR ST. FLOOR ND. FLOOR RD. FLOOR TH. FLOOR TH. FLOOR TH. FLOOR TH. FLOOR TH. FLOOR TH. FLOOR TH. FLOOR AUDITORIUM MOSQUE TOTAL
34 TOTAL LIGHTING, POWER & AC LOAD UTILITY LOAD LIFT LOAD AREA LIGHTING 10.0 CONNECTED LOAD MISC. 5 % PROVISION FOR FUTURE LOAD 5 % TOTAL CONNECTED LOAD (FOR TRANSFORMER) (except AC load & utility Load, for AC load 0.8 & utility load 0.8 ) KVA RATING KVA RATING OF TRANSFORMER 90%) SELECTION OF TRANSFORMER: 1NO KVA, 11/0.433KV. TRANSFORMER TOTAL LIGHTING, POWER LOAD UTILITY LOAD 372 LIFT LOAD 150 AREA LIGHTING 20 TOTAL CONNECTED LOAD (FOR DG) KVA RATING KVA RATING OF DG 80%) SELECTION OF DG: 1NO. 800 KVA SILENT DG SETS WITH AMF PANEL. BUT DUE TO CHANGES IN CPCB NORMS THE DG RATING IS CHANGED TO 1010KVA Substation Arrangement Substation No. 1 Main Substation (near Main Entry) - 11kv HT breaker & Metering room Substation No. 2 of NTESC Haj Tower Complex Substation - 2panel 11kV HT VCB room
35 - 11/0.415kV, 1400KVA transformer room & Main LT Panel roon Diesel Generator Area - 1nos. 1010kva DG set (outdoor) Design Details Permanent power connection Tapping of power from 11 kv NTESC line nearest to the plot. Distribution of power to substation in 11kV supply. 415 Volts for LT distribution Design Parameters 1. HT distribution at H.T - 11 KV H.T - 11/ KV L.T Volts (regulated) 2. LT Power flow will be from Main LT Panel to different loads as required. Connection between LT Panel to different loads will be with aluminium 1.1 kv grade XLPE cables suitable for 3 phase 4 wire system. 3. Ambient Temp - 45 Degree Centigrade 4. Derating factor will be applied for ambient temp, ground temperature, grouping of cables. 5. Voltage drop in LT cables will be limited to 5 % of 415 Volts. 6. Power factor to be assumed for design of installation as Improvement of power factor to be assumed Provision of Diesel Generator will be made to meet the power demand in case of power failure. 9. Supply voltage variations assumed on 11/0.415 kv NTESC supply = (+) 5% to (-) 15% and Off Load Tap Changer provision will be made on 11/0.415KV transformers. 10. Capacitors provision will be made for automatic power factor improvement of system up to 0.95 according to load on transformer. 11. Proposed L.T. distribution scheme will be through Main L.T Panel and voltage at 415 Volts 3 phase 4-wire system. 12. Transformers will be connected to L.T. panel with AL. XLPE cable of suitable ratings. 13. Number of distribution boards will be selected on basis of number of power / lighting outlets required for utilities load. 14. All L.T power cables from the substation to the building will be laid on ground / M.S / angle / channels ladder type and perforated trays.
36 16. Earthing grid will be formed using copper / G.I. strip. Design based Indian Standard amended up to date 17. Lightning protection for the buildings will be provided as per Indian Standard The following areas in the Tower Block are considered to have Air-conditioning facility: a. 1 st. Floor Lobby b. 1 st. Floor Staff area c. 1 st Floor Executive Office d. 1 st Floor Chairman Office e. 1 st Floor Chairman room f. 1 st Floor PA room of Chairman g. 1 st Floor Conference room h. 10 th Floor suite room Equipment Details 11KV XLPE CABLE As per IS 7098 (Part-II) 1985 for XLPE cables & IEC502/94 -XLPE insulated sheathed cables for electricity supply. 11KV VACUUM CIRCUIT BREAKER The HT switchgear panels shall be vertical/horizontal isolation, horizontal drawout, extensible pattern, and fixed portion shall incorporate air insulated busbars and their supports, connections, automatic shutter current transformers, fixed main and secondary contacts, breaker lifting device, ground bus, etc. The moving portion shall incorporate the vacuum circuit breakers (VCBs) mounted on withdraw-able truck. Vacuum circuit breaker shall comply with IS: (Circuit Breaker), IS: 3156 (Voltage transformers), 1S: 2705 (Current transformers). Switch Tripping Battery with Charging Equipment shall conform to IS /0.415KV INDOOR TRANSFORMER Transformer shall generally conform to the requirements of IS , Transformer core shall be conforming to IS , the windings shall be as per the specifications of IS , the windings insulation shall withstand impulse voltage as laid down in IS 2026 part , the transformer shall be dry type conforming to IEC : part 11 and 16, Generally fittings as enumerated in table X of IS 2026
37 LT SWITCH GEAR PANEL LT Switch gear panel shall be Indoor type totally enclosed dust and vermin proof, free standing, fully compartmentalized in design suitable for 415 volts, 3 phase, 50 Hz, 4 wire AC system conforming to IS: 375 all as specified herein after. Degree of protection shall not be less than IP-51 as per IS: 2147 and it shall be suitable to withstand a Fault level of 50 KA (rms) for one second LT CABLE LT Cable shall confirm to IS: XLPE insulated electric cables (heavy type) & IS: Aluminium conductors for insulated cables. POWER FACTOR CORRECTION Capacitors shall be Mixed Di Electric long life (minimum 1,00,000 operating hours) without degradation or loss of capacitance. Capacitors shall have low energy loss (less than 0.5W / KVAR) and totally tropicalised. Each capacitor shall have a discharge register to bring down the residual voltage to 50V within 60sec. Capacitors shall confirm to IS Power Capacitors EARTHING SYSTEM Earthing shall be carried out as described in IS , Code of practice for earthing. Pipe Earthing will be done with galvanized steel pipe electrode. DIESEL GENERATOR The Diesel Generator shall comply with the latest issue of the following codes BS 649 Diesel engines for general purpose. IS Methods of test for internal combustion engine. ASME codes. IS 4722 Rotating Electrical Machines. Oil coolers as per TEMA class C The design and operational features of the equipment offered shall also comply with the provisions of latest issue of the Indian Electricity Rules and other statutory regulations. LIGHTNING ARRESTOR Installation of lightning arrestor system for protection of buildings and allied structures shall be carried out as described in IS , Code of practice for protection of buildings and allied structures against lightning. INTERNAL ELECTRICAL WORK The Internal Electrification consisting of cable and conduit runs controls, distribution boards, light fittings and switch / socket accessories, etc., shall be as laid down in IS Guide for electrical layout in buildings or as directed in the Indian Electricity Rule.
38 LIGHTING DESIGN Illumination levels in various areas will be as shown: Illumination Level Av 300 Lux Area Office area Lux Lobby, passage, staircase, toilet area Lux Outdoor Indoor lighting will be with CFL, T5 lighting fixtures with electronic ballast high lumen output Lamps. Lighting / distribution will be through main lighting panels to sub distribution boards situated at various floors. Lighting circuits protected by using SP MCB - 10/16 amps with protection. External lighting will be with 150watts SON lamps on poles, 9 meter above ground, & LED Fittings on 7 meter pole, Post top lantern & Bollard. Facade lighting will be done with Metal Halide. 5.2 HVAC System General The Haj Tower Complex consists of three blocks, New Haj Tower, Auditorium and Mosque. The Haj Tower is eleven storied with a basement. The first floor of the Haj Tower & 10 th floor are under the scope of air conditioning. The first floor consists of lobby, counters, conference, Chairman room, executive office etc. The basement will be used for car parking. The Car parking basement shall be ventilated. The floor height is taken as 13 ft. The aforesaid areas of the Haj Tower will be air conditioned by ductable type split units Basis of Design Outside Design Condition The outside design condition in Kolkata in summer is taken as 37.8º C (100º F) DBT & 28.3º C (83º F) WBT as per NBC The monsoon condition is taken as 32.2ºC (90º F) DBT & 30º C (86º F).
39 Inside Design Condition The inside design condition for designing has been taken as per NBC 2005, 23.9 ±1º C (75º F) DBT & Relative humidity being around 55 %. Lighting & other Electrical Load The lighting and equipment load at lobby and conference is taken as 2 W/sq. ft and in office area it is taken as 3 W/sq. ft. Occupancy Occupancy is estimated considering maximum number of occupants who may be present in each space. Number of people considered in each area is given in Table 1. Fresh Air Fresh air quantity for office and conference is considered as 10 CFM/person and in lobby area it is taken as 5 CFM/person Cooling load Based on above parameters, the cooling loads for each area are calculated separately. The cooling load & technical data are furnished in Table 1. Table 1 Building & Technical Data Sl. No Area Name Floor Area (sq. ft.) Lighting &Equip. Load ( kw) Occupancy Fresh Air (CFM) Dehumi Air (CFM) Cooling load (TR) 1. Lobby Office Conference Proposed System of Air-conditioning From Table-1, the cooling load for the first floor comes to 56 TR. It is proposed to air condition the above areas with ceiling suspended Ductable Split Units. The cold air is to be distributed at different sections through ducting and terminal diffusers. Outdoor units shall be installed at outside wall at a convenient place. Selection of proposed equipments is given in Table -2. Since this is an air cooled system, no water is required.
40 Table 2 Proposed Air Conditioning Equipment Schedule Sl. No Area Name Floor Area Cooling load (TR) Proposed Units Type (sq. ft.) 1. Lobby TR x 2 Ductable Split 2. Office TR Ductable Split 3. Conference TR Ductable Split The area of car parking basement is about sqft. The basement shall be provided with exhaust ventilation through two no axial flow fan of capacity 26000CFM Power Requirement Sl No Equipments Qty Power TR Ductable Split 3 66 kw TR Ductable Split 1 14 kw 3. Ventilation fans 2 22 kw Total 102 kw The above power 102 kw is connected load only. By considering 80% diversity, actual power consumption may be taken as 82 kw. 5.3 Water Supply Source The Domestic Water demand for the daily activities will be met up by the State Public Health Engg. Dte., which is in charge of supply of potable water and treatment and disposal of spent water in the New Kolkata Township. However, the Authority is not going to supply any water for Construction purposes, which is also quite significant for such a huge project. It is therefore proposed to sink one temporary Tubewell of depth 132 m and size 250mm-150 mm with an assessed yield of 10,000 gph to meet up the construction water needs.
41 The PHED will supply treated potable water to the premises and will not require any further treatment. The supplied water will be stored in two ground reservoirs of capacity 200 M 3 each. It is proposed to sink and install one Tubewell temporarily, during the construction phase to meet up the demand of different construction activities. The technical details of the proposed temporary source are as per following: Size : mm Total Depth : 132 M (250-36m & m) Material Strainer length Expected Yield Method of Sinking Siting Packing of Well : UPVC : 30 M provided at a depth of 96 m : 45,000 LPH : Direct Circulation Drilling by mechanical rig : location of the temporary source has been marked in the services layout plan. : Pea gravel packing with top 10 m packed with puddle clay balls. Installation of Pump & Motor- Submersible multistage pump motor set of Capacity cum/hr. max (i.e., 250 LPM) at 50 M head with suitable HP Rated Motor (min. 3.7 kw, 5HP) at 2900 RPM; including supplying of suitable "Submersible" type PVC insulated Sheathed Armored Cable including 415 Volt, 3-phase, 50 Hz Star-delta Starter Panel with Switch Fuse units and Isolators Demand Assessment WATER REQUIREMENTS & SOURCE OF WATER : SOURCE OF WATER : The chief source of Water is from Municipal (NKDA) Supply. DESIGN BASIS : WATER SUPPLY :- The proposed water supply for the New Haj Complex has been envisaged based on the following basis : - (As per prevailing Norms of The National Building Code) a) Potable Water Demand as per Nos. of persons (Floor-wise) : - (i) Gr. Floor Demand :- (For Dining of 400 Persons Seats +20 Kitchen Staffs-appx.):- As per 70 Ltrs./head/Day x 400 heads = Litres/day = 28.0 M 3 / Day. As per 45 Ltrs./head/Day for Office Staffs x 20 heads-appx.=900 Ltrs/day= 0.90 M 3 /Day.
42 (ii) 1 st Floor Demand :- For 50 Office Staffs (appx.) :- As per 45 Ltrs./head/Day x 50 heads-appx. = Litres/day= 2.25 M 3 / Day. (iii) 2 nd Floor Demand :- For 300 In-mates in Dormitories :- As per NBC Norms for Demand in Hotel (up to Ltrs./head/Day x 300 heads = Litres/day = M 3 / Day. (iv) 3 rd Floor and upto 9 th Floor Total Demand :- (For Dormitories) (For 300 In-mates/ Floor x 7 Floors) 135 Ltrs./head/Day x 300 heads x7 Floors= Litres/day = M 3 / Day. (V) 10 th Floor Demand : (For Dormitories) :- As per NBC Norms for Demand in Hotel (up to Ltrs./head/Day x 300 heads = Litres/day = M 3 / Day. + VISITORS DEMAND VISITORS PER DAY = (230/day 15 Ltrs./head/day as per NBC) :- = 3.45 M 3 / Day TOTAL POTABLE WATER / DAY : 399.1M 3 / Day. (Say) : 400 cum/ day Considering (5%) as foot-fall: Total potable water 420Cum/Day Considering One day's storage of Domestic water in the Ground Reservoir, and 2 times pumping in a day; the total capacity of the Domestic Water Reservoir is taken as 420 CUM. Provided 2 nos, Ground reservoirs of 210 m 3 capacities each Distribution System Water from the main feeder main will be collected through a branch Tee connection by means of a communication pipe of 75 mm dia GI, controlled by a Sluice Valve and fitted with one non Return Valve to ensure only unidirectional flow. A bulk water meter will be installed by the NKDA at the point of offtake after the sluice valve. The communication pipe will be connected to the two ground level reservoirs by means of Tee branches with two nos. Gate control valves at each branch. A kinetic Air Valve will be installed at the summit point in order to avoid air build up or vacuum condition in the pipe line.
43 Two nos. Ground level RCC storage tanks each of capacity 210.M 3 have been provided as combined Fire Fighting and Drinking Water Storage Tanks. Both the tanks are compartmented to have exclusive storages for 210 M 3 for Drinking water as one days demand and 2nos. of M 3 for fire storage. The tanks will be provided with necessary vent pipes for maintaining inside atmospheric conditions alongwith overflow and mosquito proof arrangement as well as level control equipments to arrest wastage of water. Hydro-pneumatic type Pumps with stand-by facility each of discharge capacity of M head with 88 KW on peak demand, having each set of the system with (4 working + 1-stand by) pumps with 1 st pump with VFD drive to cater optimum flow as per the exact requirement initially, with the provision of automatic running of the 2 nd, then 3rd. & if required the 4 th. pump under peak Demand condition of Potable Water. Each pump is integrally coupled with individual Motor and will be used for lifting of water from U/G Domestic Water Compartment directly to all the potable water outlet points with a provision to fill the Terrace Domestic water tank provided at the roof level. The pumps are proposed as hydro-pneumatic type starting automatically when there is a drop of pressure in the delivery storage. There will be two such pump Sets with suction from both the Reservoirs. Two nos. RCC tanks each of combined capacity of 125 cum (out of which 20 cum for Fire exclusively & 105 cum for Domestic use) will be provided for the two wings at the present roof level. The Tanks will be provided with necessary free board, water seal, overflow and scour arrangements alongwith mosquito proof measures. Direct distribution from respective Pressurised Wet Risers to the individual Toilets has been arranged with an extra provision for Gravity distribution to all the water and sanitary fixtures from the overhead tanks by down-take GI Pipes with control valves at the off-take points. From respective single main pipes running vertically, branch tee connections will be made at each floor for supplying water to the respective Toilets, Kitchens, Sinks, etc. All individual lines will be controlled by valves and unions to facilitate maintenance works. In order to prevent high pressure build up and subsequent overstressing of the joints and fittings at the lower floors, Pressure reducing valves will be installed at the branch off-take points. 5.4 Sewerage & Drainage System Sewerage Quantity Assessment Consumption of water per day = 420 M 3 Volume of waste water generated per 80% = 316 M 3 Flushing water 25% = 80 M 3 It is proposed to recycle and reuse 100 M 3 of spent water per day for toilet flushing purposes only after tertiary treatment of sewage. The remaining 216 M 3 of waste water will be disposed off in the PHE Trunk Sewer system through the nearest Manhole abutting the site. Proposed Treatment System
44 System proposed in sequence for treatment and reuse of Sewage by means of an STP of capacity 100 M 3 : 1. Manual Screening for removal of floating materials 2. Oil & Grease Trap for removal of oily substances 3. Grit chamber for removal of inorganic settlable matters 4. FAB Reactor for removal of Bio-chemical and Chemical loads using diffused aeration system 5. Disinfection of the effluent from FAB 6. Pressure filter for tertiary treatment of effluent from FAB 7. Tube Settler for settling of Sludge generated from FAB 8. Sludge holding Tank for holding settled sludge 9. Sludge Drying Beds for dewatering and drying of sludges which can be used as a soil conditioner for gardening and landscaping in the surrounding area. 10. Activated Carbon adsorption process for removal of dissolved gases from the Effluent from Filtration process 11. Disinfection of the treated effluent before reusing the same either for flushing or for gardening.
45 Air Compressor Screen chamber Oil & Grease Trap Grit chamber FAB Reactor Tube Settler Disinfection Sludge Holding Tank End Use Activated Carbon Bed Pressure Filter Sludge Drying Beds Process Flow Diagram Process Flow Diagram for 100M 3 STP Treated effluent characteristics: a. ph : b. TSS : <20 mg/l c. Oil & Grease : Nil d. BOD 5 (20 0 C) : <05mg/l e. COD : < 10 mg/l Sewerage System The System for vertical transmission of sewage is proposed to be a TWO STACK SEPARATE DISPOSAL SYSTEM. One Stack being the C.I. Sewer Stack ( Centri cast as per IS-3989) conveying the Human Sewage from WC s & Urinals directly to the Inspection Pits and finally disposed to the nearest MANHOLE of the existing NKDA SEWERAGE system through Master chamber. The other Stack being the Waste Stack ( Centri cast as per IS-3989) disposing the Waste water from Wash basins & Ablution Floor Traps of the WC s / Floor washing Floor Traps (FT) etc., to the Inspection Pits via (GC) Gully Trap Chamber and final disposal to the Master Chamber connected to the NKDA SEWERAGE system. The Salient features of the Sewerage and Sewage Disposal systems are :
46 That the Inspection Pits of the sewer lines, are located inside the greenery Plantation / or Paved area as far as possible, to keep them camouflaged properly by the Plantations beside the Drive-way. Inspection Pits are arranged at the centre of the Drive-way to avoid direct Vehicle Wheel pressure. Gully Trap Chambers through its water seal will arrest the Foul odour from entering the Building Waste pipe Network. All Inspection Pits (IP) are covered with fully Air tight Double water Seal Ream C.I. Medium / Heavy duty covers (as per IS-1726)-, for preventing any Rain water seepage and leakage of foul odour. Under-ground Sewerage Lines are a combination of Salt-glazed Stoneware (SGSW) pipes (upto 300mm dia) and RCC NP2 pipes for pipes more than 300 mm dia connecting consecutive IPs. All S.W. pipes will be laid on 15 cms. (6 ) thick cement concrete bed with full concrete encasement of the pipes all-around. The pipes between two manholes will be laid in straight line without vertical or horizontal undulations..the pipes will be laid socket up the gradient. The invert of the smaller sewer at its junction with main will be at least 2/3rd dia. of the main above the invert of the main. The branch sewer would deliver sewage in the manhole in the direction of main flow. C.I. pipes from the building Stacks. will terminate at the 1 st Summit Pit (1 st Inspection Pits) All Sewerage Soil Stacks are connected with a Sand Cast 50mm dia Vent Stack from the gr. Floor up to the top floor portion of the Sewer Stack and finally air vented through a CI Vent Cowl fixed at the top of each Stack. All external Bends and Junctions of the Stacks / or Fittings are provided with inspection door provisions to facilitate probing/cleaning / rodding etc. operations as and when required., Pipes / Stacks are fixed to the external walls with the help of GI Holder Bat Clamps keeping a clearance from the wall. Except the Vent Stack all the Sewer & Waste pipes and Pipe Fittings and Specials are of Centrifugally Cast (Spun) C.I. pipes. Joints of all vertical and internal lines will be lead caulked Internal Sanitation Sanitary Fittings, Appliances and Fixtures at all toilets, and kitchen have been provided as per norms laid down in the latest edition of National Building Code. Adequate no and types of WCs and Urinals suitable for physically handicapped persons have also been provided as per NBC norms at all levels. Waste from Wash Basins, floor traps, Sinks, Ablution Traps inside wc s etc, will separately discharge into the Waste Stacks that terminate & feed to the (IP) Inspection Pits that leading finally to the disposal system. All soil appliances and pipes have been provided with anti-syphonnage system as per norms. These will be HCI pipes of sand cast with lead caulked joints and to remain connected at a point with the Sewer Stack above every Junction Branches (keeping a gap of 450mm above the top-most Junction Branches per floor from the Stack and finally after running parallelly
47 with Sewer Stack terminated above the top most finish floor level at a point above all the other horizontal junction points. 5.5 Drainage System The entire campus has been provided with underground RC pipe drainage system for carrying the runoff from the open areas as well as the spillage from the storage provisions through yard gully chambers. The drainage lines have been provided along all the internal roads and pathways for ultimate disposal into the Storm water Manholes of the Township drainage system of NKDA. NP-2 R.C.C. pipes will be used for storm water drainage, on a concrete bed. The Pipes and Collars will be cement mortar jointed and tested under a Hydro-static Pressure 1.5 Kg-/ cm2 with a minimum Holding time of 1.0 hour. The pipes with their crown level at 1.22 Metre (4 ft.) depth and less from ground will be covered with 15 Cms. (6 ) thick concrete above the crown of the pipe and slipped off to give a minimum thickness of 15 Cms. (6 ) around the pipe. Pipes deeper than these shall be concreted in a haunched manner DRAINAGE OF BASEMENT The basement in case of water stagnation, will be drained out by means of two nos. separate dewatering pumps located at the end of saucer drains inside the basement with a sump. For transfer of logged water from Basement to the adjacent outside Yard Gully Chamber / Storm water Manhole, de-watering Pumps fully submersible Vertical mounting type integrally coupled with motor, alongwith matching Motor Control Panel will be used. 2 no. Pump alongwith one no. standby of capacity LPM with 8.0 M operating head with integrally coupled "Submersible" type Motor will be used for the purpose. 5.6 Rainwater Harvesting The main principle of RWH in the campus will be: To store the rooftop rainwater run-off and collection of surface run off from open areas in an RW pond/tank Natural recharge through the top soil by limiting the area of impervious surface in the open spaces to the bare minimum To reuse 40% of the stored water during the period of shortage/crisis and 60% for recharging the underground aquifers Reuse will be for gardening, landscaping, floor cleaning and toilet flushing Roof top Rain water Harvesting: Storm water from the roof surfaces will be collected by 150 mm dia RW Pipes at the preferred locations and will lead to the Rain water collection tank provided at ground level. Tank overflow will lead to Yard Gully chambers of the surface drainage system. Total area of Roof = 4,600 Sq.M. Annual Rainfall of Kolkata region = 1640 mm
48 Considering Run Off coefficient as 0.90 and efficiency of collection in consideration of evaporation and spillage losses and first flush wastage as 80%, Quantity of available Rain water = 4600x1.64x0.9x0.8= 5431 Cu M. per year Considering, Rainfall duration of 120 days in a year, Average volume of Rain water available per day= 5431 /120=45 Cu. M. Considering a peak rainfall intensity of 25 mm for 15 min, Peak Run off quantity for 15 min = 4600x0.025x0.8x0.8 = 74 Cu.m. To provide 1 nos. ground level storage tank of size 6.0 m x6.0 m x 2.1 m The quantum of Rain water stored will be reused for renewal of Fire Fighting reserve and other non domestic purposes like floor cleaning, car washing, etc Natural Recharge from Open Areas Total area of unpaved surface = 15000Sq.m. Total area of Road ways & paved surface = 5000 Sq.m. Considering, a percolation co-efficient of 80% and efficiency of collection in consideration of evaporation losses as 90%, Water endowment of the area = 15000x1.64x0.8x0.9= 17,712 Cu.M. Annually Average daily endowment = 17712/120= 148 Cu.M. Surface run- off to be carried for peak rainfall intensity of 25mm/15 min Run-off from the paved roadways and pathways = 5000x0.025x0.8x1.0 =100 Cu.M Surplus run off from the open area = 15000x0.025x0.2x0.9= 68 Cu.M Hence, Total flow from the open area =168 CuM/15min =0.19 Cumec = 6.6 Cusec Artificial Recharge Run off from roof areas: 45 cu.m. Per day Considering 60% recharge, quantity = 27 cu.m Recharge System The rainwater tank will be used as a recharge structure provided with recharge shaft at bottom. the tank bottom will have permeable layers with courses of stone ballast, gravels and coarse sand from bottom to top layer along with recharge shaft provided for a depth of 122 m from the tank bottom for recharge of aquifer.
49 Total volume of 2 nos. RW tanks: 6.0x6.0x2.1 = 75.6 cu.m> 74 cu.m., Hence volume is ok Design of infiltration system Assumption of Parameters: Soil Medium : Coarse Sand Infiltration Rate : 5.0 m3/m2/d (Vi) Permeability : 3.0 m/d (k) Effective Porosity = 30% (Pc) Aquifer Location : 95 meter from ground level Aquifer Depth : 30 Meter Proposed Provisions: I. One no, Recharge tank of size 6.0mx6.0mx2.1m II. III. One no. recharge shaft of diameter 250 mm and depth 122 m. from the tank bottom 150 mm. dia PVC pipe provided within the recharge shaft with a) Top projecting above the ground level for a height of 1.0 m., b) Slotted at top for a length of 1.0 m. provided within the filter media of ballast & gravel of the Recharge pond, c) Strainer provided for a length of 30 m. within the aquifer at a depth of 95 m. from the GL d) A blank pipe of 6.0 m. at the bottommost part. Surface Area of Recharge Structures: Percolation Pipes (150 mm dia-30 m depth of strainer) Considering 50% perforation 30x x0.15x0.5+ x0,15 2 /4= 7.08 Sq.m Provided 1 nos recharge shafts Total recharge area of the recharge shafts: 7.08 sq. m. Hence quantum of recharge: =5x7.08 = m3/d
50 Average Run off quantity per day = 27 m3/d< m3/d. Hence, OK. The actual depth & location of provision of strainers will be decided at field after verification of the underground soil strata during the boring of well. Peak run off quantity for 15 min= 74 M 3 Recharge within 15 minutes = 0.37 M3 Balance water will be stored in the Settlement tanks of capacity 75.6 M Fire Fighting Measures Fire combat measures in the entire building area have been provided strictly as per norms laid down in the latest edition of National Building Code. Two nos. Under-ground Fire storage tanks each of capacity M3 (exclusively for Fire) have been provided on two sides of the building at Ground level in a combined manner with the potable water tank (Total capacity M3 /Tank) having separate compartments for both the purposes. The fire storage will be maintained and refreshed by the Rain water system of the building. Two nos. Terrace level tanks of capacity 125 M3 each provided at the roof will also serve as Fire storage ones for supplying water by gravity through the downtake wet risers in case of necessity. One no. Main Hydrant Electrical Pump set, one no. Jockey pump, One No. Sprinkler Pump and one no. Diesel engine driven pump set have been installed at the Basement floor for supplying water from the ground level storages to the fire combat arrangements, which will start automatically whenever there is a drop in the line pressure due to burst of sprinkler or release of water in the incidence of Fire. Capacity and type of the pumps are as follows. Main Hydrant Electrical Pump : LPM with operating head of 93M Jockey Electrical Pump: LPM with operating head of 93 M Sprinkler Diesel Pump : LPM with operating head of 93 M Diesel Engine driven Hydrant cum sprinkler Pump: Split LPM with operating head of 93 M Respective Wet Risers (150 mm dia MS ERW Heavy class) for both Hydrant and Sprinkler have been provided for each 1000 M 2 Floor area with Fire hose reels 65mm dia with GM nozzle 20 mm at each stair landing of the building along with 65 m dia control valve as per NBC specification Automatic sprinklers ( 15 mm) with quartzoid bulbs have been provided at 3.7 m c/c distance at Basement car parking lot, All,Laboratories, Office areas, Lobbies, Corridors and all places of Public gathering, except in classrooms, Kitchen & Electrical rooms. The sprinklers will burst whenever there is a heat build up condition and water flowing in the form of high pressure jets will help in fire combat measures.
51 Electronic smoke detectors have been provided in all areas except Kitchens and Electrical Panel rooms. Heat detectors have been provided in the Kitchens and Electrical Panel rooms. Alarm system has been provided in all the floors Repeater Panel provided in the reception lobby. Portable Fire extinguishers at all floors at every 22.5 m (maximum) distance Adequate provisions of Fire Hydrant system in the external yard. 6.0 PROJECT COST The Main Tower Block shall be a B + G + 8 Storied building with provision in foundation for building another 4 floors in future. There shall also be a 1200 capacity Auditorium, a single storied Prayer Hall with provision for extension by another 3 stories in future along with development of all basic infrastructure services such internal roads & pathways, water supply, sewerage & drainage, etc. as per the requirement. The Project Cost has been computed mainly based on current PWD (Building, Sanitary & Plumbing and Electrical) Schedules. Wherever no item is available in the said Schedules, rates have been taken from similar items in current Schedules of PWD (Roads) and / or CPWD (Kolkata region). Foe balance Non Schedule items rates have been analysed based on current Market Rates. The Cost Estimate includes all items of work related to the civil works for buildings proposed within the Campus, internal roads and pathways, water supply, sanitary & sewerage system, storm water drainage, fire fighting, electrical, HVAC, landscaping, etc. The necessary charges to be paid to Statutory Authorities such as NKDA, WBSEB, Fire and Agency Charges has also been estimated and included. The Bill of Quantities is appended later. The Abstract of Project Cost is given below.
52 ABSTRACT OF PROJECT COST Sl. No. Item Part wise Amount Total Amount (Rs.) 1 Civil works (Part-A) Civil works (Part-B) 2 Sanitary, Water supply, Sewerage, Drainage (Part-A) Sanitary, Water supply, Sewerage, Drainage (Part-B) 3 Electrical works + Lift (Part-A) Electrical works + Lift (Part-B) 4 HVAC (Part-B) 5 Fire Fighting (Part-B) 6 Sub Total (1 5) 7 Cost of 5% on Sl. 6 8 Cost of Supplementary 2% on Sl. 6 9 Sub Total (6 8) WBSEB Deposit & Service Connection Sanction Fees to Statutory Authorities
53 12 Sub Total (9 11) 13 Consultancy 2% on Sl Supervision 1% on Sl TOTAL PROJECT COST (12 14)