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NOVEL Engineering Consultants Pvt. Ltd.

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BWSSB REPORT ON WATER SUPPLY & SANITARY SYSTEM

Page 1 of 15

Rev. R0 dtd. Jan 09, 2016 4

PROPOSED “RESIDENTIAL APARTMENT “AT MAGADI ROAD, BENGALURU

FEASIBILITY REPORT ON WATER SUPPLY AND SANITARY SYSTEM

CLIENT SATTVA GROUP

ARCHITECT RATHI ASSOCIATES

CONSULTANTS

NOVEL Engineering Consultants Pvt. Ltd. Build. No.55, Flat No-1, Ground Floor,

8th Cross, 5th Main, Malleshwaram, BANGALORE-560003

Tel/Fax: 23342576


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Rev. R0 dtd. Jan 09, 2016 4

1.0 SOURCE OF WATER

The project is served with metro water supply and also from tankers. After studying the raw water characteristics, the necessary water treatment plant will be planned.

2.0 WATER BALANCE

Plumbing fixtures shall be supplied with water in sufficient volume and at pressures adequate to enable them to function properly and without undue noise under normal conditions of use.

Refer to the regulations of National building code, the average per capita water is assumed to be 135 litres per day. The water requirement is calculated as follows. Total 1385 flats x 5 persons per flat x135 lpd = 934,875 Litres Say 935cu.m The capacity of The STP works out to be = 934.875 cum x 0.95 = 888.13 cum. STP,s are located in two places. Capacity of STP at each place is 444.06 say 445 cu.m


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Rev. R0 dtd. Jan 09, 2016 4

Fresh water Requirement/day

= 607 cum/day

Total Water Requirement

935 cum/day

Qty of sewage Generated –354cu.m

92 cu.m used for gardening

After 95% diversity (888.0 CUM)

Roof Rain Water

collection Sump 270

cum/day

Capacity ETP proposed - 534 cu.m /day Qty. sewage treated – 354

cum /day

Qty of sullage Generated –534cu.m

50 cu.m Vehicle washing

312 cum used for flushing

35 cu.m for Club house

Balance 354cu.m will be supply to BBMP parks & play grounds/ BWSSB sewer line

Quantity of treated water available =354x0.95 = 336 cu.m

Quantity of treated water available

=534x0.95 = 507.3cu.m

Excess STP water 24cu.m


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Rev. R0 dtd. Jan 09, 2016 4

4.0 FLUSHING LANDSCAPE WATER USAGE

Recycled water from STP after necessary treatment shall be stored in STP final sump and used for toilet flushing and gardening. Landscape Water Requirement will be taken as 0.4Litres per sqft. Approx. area to be irrigated will be = 15295.86sqmts.x 6 litres / sq.mtrs Landscape water requirement = 91775.76 Litres Say 92 cu.m Flushing water requirement = 1385 x 5 persons x 45 lpd = 311.625Litres Total daily Flushing & Landscape water requirement = 4,03.40cu.m Say 404cu.m

5.0 SEWAGE TEATMENT PLANT (STP) – TECHNOLOGY – SBR The sewage from the inspection chamber shall be conveyed through the external sewerage network of the project and finally disposed into the sewage treatment plant. The capacity of the sewage treatment plant is worked out to be 2nos. 445Cu.mtrs. The approximate space required for each STP will be 500.0 Sqmtrs. STP can be constructed totally below ground with an accessible stair case to reach the pump. The below ground STP requires mechanical ventilation. The object of sewage treatment is to stabilize decomposable organic matter present in sewage so as to produce an effluent and sludge, which can be disposed of in the environment without causing health hazards or nuisance. The degree of treatment to be adopted should not only meet the requirement of regulatory agencies but also result in the maximum use of end products consistent with economy. Extended Aeration with sequential batch reactor technology is proposed.

6.0 SEQUENTIAL BATCH REACTOR The process of BOD removal, nitrification/de-nitrification, phosphorus removal and sludge separation are achieved continuously on a single SBR tank. The process operates on the continuous inflow and batch outflow principle. The phases of aeration, settling, decantation occur sequentially and are controlled by a PLC. The tank is divided into pre-aeration and main aeration tanks by a baffle wall with openings at the bottom. The sewage flows continuously into the pre-aeration tank. Which acts as a biological selector enhancing the growth of the most desirable organisms while limiting the growth of the filamentous bacteria. Sewage from pre-


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Rev. R0 dtd. Jan 09, 2016 4

aeration tank flows through openings at the bottom of the baffle wall and into the main aeration tank where BOD removal and nitrification occur. After aeration phase, sludge separation occurs in the settling phase. After settling, the clear water from top is removed through a PLC operated decanter. De-nitrification occurs during anoxic periods of settling and decant phases. The excess sludge is wasted during decant phase. The SBR treated water is disinfected using sodium hypochlorite and filtered through a pressure sand filter. The final treated water will be stored for recycling for gardening purpose. The waste sludge is used as manure after dewatering through filter press. It is recommended to provide ultra-filtration after the tertiary treatment to bring down the BOD content less than 5 ppm. The efficiency of a treatment plant depends not only on proper design and construction but also on good operation and maintenance. The Characteristics of Raw sewage shall be as follows pH = 6 - 7 TSS = 400 mg / litre BOD5 = 300 - 350 mg / litre COD = 450 - 500 mg / litre Characteristic of Treated sewage shall be as follows pH = 7 - 8 TSS = 10 mg / litre BOD5 = 5 mg / litre COD = 30 mg / litre

7.0 QUANTITY AND QUALITY OF WASTEWATERS

The wastewater quantity from domestic sources is considered at maximum of 80% of water consumed. The quality of raw effluent and treated effluent is considered as below:

Quantity water consumed per day will be 935 cum

Quantity of sewage generated per day will be 888cum. Say 890cu.m It is proposed to provide STP & ETP at two locations Capacaity at each location will be 155cu.m STP & 290cu.m ETP

8.0 BASIC DATA ON WASTE WATER (SEWAGE)

Quantity : 155KLD pH : 6 – 7 Suspended Solids : 300 – 400 mg/lit Bacteriological quality (as per coliform


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Standards) : Unsafe BOD 5 : 300 – 350mg/lit COD : 700 – 800mg/lit Ammoniacal nitrogen content : 4 – 40 mg/lit Oil & Grease : 50mg/lit

9.0 TREATED WASTE WATER (SEWAGE) QUALITY for irrigation- After Tertiary Treatment

As stipulated by Karnataka State Pollution Control Board (KSPCB), the treated effluent quality shall be within the following values for various parameters, for both present and future.

Quantity : 155 KLD PH : 6 .5 – 7.5 Suspended Solids mg/lit : 10mg/lit Turbidity, NTU : 1 BOD5 : 10mg/lit COD : 50 mg/lit Oil & Grease : 5 mg/lit Free chlorine ppm : > 2.0

10.0 Treated water characteristics for flushing should be as under: After Ultra

Filtration

Quantity 155 KLD

BOD mg / l ≤ 5

COD mg / l ≤ 20

TSS mg / l ≤Non detectable

pH - 6.5 – 8.0

Total Coliform MPN / 100ml ≤ 100

E Coli MPN / 100ml ≤ Below Detectable Limits (Post Chlorination after UF)

Colour - Clear, Unobjectionable

11.0 DISPOSAL OF TREATED SEWAGE

After the treatment the recycled water will be used for landscaping. During rainy season / monsoon the treated effluent if not used for landscaping, the same will be transported through the tankers to nearest municipal parks.


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Rev. R0 dtd. Jan 09, 2016 4

DESCRIPTION OF CIVIL WORKS – STP-01 1 Screen Chamber

1 1.5x1.5x0.6m SWD RCC

2 Equalization tank


3 Pre-aeration Tank


4 Drain Sump

1 1.0 x 1.0 x 1.0m SWD RCC

5 SBR Tank


6 Decanter

1 25.0sq.mtrs x 2.5m SWD RCC

7 Sludge Holding Tank 1 3.0x1.54.6m SWD RCC

8 Final sump

1 12.0 sq.mtrs x 4.6m SWD RCC

9 Foundations for Static equipment pumps, blowers, railings, staircases, interconnecting, drain channel etc

1 lot As required Suitable

DESCRIPTION OF CIVIL WORKS – ETP-01

1 Screen Chamber


2 Oil & Grease Chamber


3 Equalization tank


4 AerationTank

1 61.0 sq. mtrs x 4.6m SWD RCC

5 Pre-collection tank


6 Final tank


7 Settling tank


8 Drain Sump

1 1.0 x 1.0 x 1.0m SWD RCC




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Rev. R0 dtd. Jan 09, 2016 4

DESCRIPTION OF CIVIL WORKS – STP-02 1 Screen Chamber


2 Equalization tank


3 Pre-aeration Tank


4 Drain Sump

1 1.0 x 1.0 x 1.0m SWD RCC

5 SBR Tank -01


6 Decanter


6 Sludge Holding Tank


8 Final sump




DESCRIPTION OF CIVIL WORKS – ETP-02

1 Screen Chamber


2 Oil & Grease Chamber


3 Equalization tank


4 AerationTank

1 7.65x7.9x4.6m SWD RCC

5 Pre-collection tank


6 Final tank


7 Settling tank


8 Drain Sump

1 1.0 x 1.0 x 1.0m SWD RCC




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Rev. R0 dtd. Jan 09, 2016 4

12.0 IRRIGATION SYSTEM Automatic irrigation system will be designed based on the landscape layout. Automatic sprinkler and drip irrigation system with Separate control valve for operating each zone shall be provided. Sewage treatment plant recycled water and rainwater will be used for irrigation.

13.0 ROOF DRAINAGE SYSTEM

Vertical rain water down take pipes are designed for Bangalore rainfall intensity of 100mm/hour (For 15min. Storm) The minimum diameter of terrace rain water vertical down take pipe shall be 110mm.

14.0 SURFACE RAIN WATER HARVESTING SYSTEM Rainwater harvesting system consists of construction of a series of open bottom masonry wells with dry joints at regular intervals. The well shall be filled with graded gravel and sand as filter media to a certain depth. The top cover slab shall be RCC with manhole frame and cover shall be provided for the inspection. The capacity of the well shall be based on the permeability characteristics of the soil and the quantity of run-off. The rain harvesting system will help to recharge the aquifers and increase the level of underground water table. The excess water after saturation shall be disposed into the city storm water drainage system.

15.0 TERRACE RAIN WATER HARVESTING SYSTEM

The vertical rain water down take pipes from the terrace shall be connected to a common header at lowest floor level. The rain water will be collected in the rainwater harvesting sump. After necessary treatment, the water will be mixed with the recycled water and used for toilet flushing and gardening. Rain water Collection tank sizing: Building -I – Towers – 1,2,3,4,5, 16, 17, 18,19,20,21 &22. Option-1: Based on Empirical Formula Q = CIA/360

= (0.95 x 0.5323 x 100) / 360 = 0.140 cum /sec. Assume storage for 15 minutes = 0.140 x 1 x15x60 = 126cum. Provide 126x2.0 day storage = 252cu.m Say 250 cu.m

Option-2: Based on BWSSB requirement The rain water collection sump capacity = 5323 sq.mtrs x 20Lpm/sq.mtrs = 106.46cum Provided 106.46x2.0 day storage = 212.92cu.m Say 215 cu.m


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Rev. R0 dtd. Jan 09, 2016 4

Note: Maximum of option 1 & 2 is considered as the storage. Building -2 – Towers –6,7,8, 9,10,11,12,13,14,15 & Club house Option-1: Based on Empirical Formula Q = CIA/360

= (0.95 x 0.6028 x 100) / 360 = 0.159 cum /sec. Assume storage for 15 minutes = 0.159 x 15 x60 = 143.16cum.

Provide 143.16x2.0 day storage = 286.32cu.m. Say 290 cu.m

Option-2: Based on BWSSB requirement The rain water collection sump capacity = 6028 sq.mtrs x 20Lpm/sq.mtrs = 120.56cum Provided 120.56x2.0 day storage = 241.12cu.m Say 250 cu.m Note: Maximum of option 1 & 2 is considered as the storage.

16.0 STORMWATER DRAINAGE SYSTEM As per the Bengaluru climatological data, the average rain fall intensity of 100mm per hour is considered for the design of storm water drain.

Estimation of Storm Run off Storm water runoff is that portion of the precipitation, which drains over the ground surface. Estimation of run off reaching storm sewers depends on intensity and duration of precipitation characteristics of terrain and time required for such flow to reach the drain. The storm water flow for this project is worked out by using rational method with rainfall intensity and precipitation data. The following data are considered while designing the system. i) Run-off rainfall intensity relationship.

Rational formula for calculating runoff

Q = (C I A) / 360 Q–Runoff in m3/sec C– Co-efficient of run off I – Intensity of rainfall in mm/ hr. A – Drainage area in hectares.


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RAIN WATER HARVESTING: The surface rain water generated from the project will recharged into the ground through recharge pits. Rational Formula for calculating the runoff = Q = (CIA)/360

Q= Run off in m3/sec.

I=Intensity of rain fall in mm/ hour.

A=Catchment area in hectares

C=Runoff co-efficient

Runoff Co-efficient for various surfaces

Open grounds unpaved street 0.5

Parks, lawns and gardens 0.25

Macadam roads, pavements 0.7

Asphalt pavements 0.85

Water tight roof surface 0.95

Total Run off Roof Top – Building 1 +Building 2

Quantity of ran water to be collected from the roof is estimated below

Average Annual rainfall in Bengaluru(Source: IMD in mm 970mm

Collection efficiency 95%

Average number of rainy days in a year 60

Total area in sq,mtrs. 11351


Quantity of rain water to be harvested from roof top in cum /sec = 0.97* 11351* 1/60 = 183.50 cum.

0.95

Data Assumed:

Volume of rain water available for harvesting is 100%

183.50Cum

This run-off is being diverted to raw water sumps Total Runoff Hardscape







Quantity of rain water to be harvested from roof top in cum /sec = 0.97* 6986* 0.7/60 = 79.05cum.

0.95

Runoff being diverted to recharge pits.


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Page 12 of 15

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Data Assumed:

Volume of rain water available for recharging is 100%

79.05Cum

Total Runoff Soft Scape







Quantity of rain water to be harvested from roof top in cum /sec = 0.97* 14451* 0.25/60 = 58.40 cum.

0.95

Runoff being diverted to recharge pits.

Data Assumed:

Volume of rain water available for recharging is 100%

58.40Cum

Total runoff from all the source for recharging = 79.05 hard scape + 58.40 from soft scape = 128.123 cu.m Total runoff to be recharged will be = 128.123 cum.

Percolation pit calculation:

Data assumed: (1.5m dia x 3.0m effective depth recharge pit)

No. of percolation pits 26

Infiltration rate is 10cm/day 0.10m/day

Diameter of 1.5m is considered, Area of each soak pit 1.767sqm

Quantity of water percolating in each pit 0.1767Cum

Total quantity of water percolating per day 4.59Cum

Volume of each pit with 3.0m effective depth 5.30Cum

Water holding capacity of pits 137.80Cum

Total quantity of water percolating + retained 142.39Cum

Note -1: The Strom water will be ground recharging and the excess storm water after

the overflow from recharge pits will be discharged into the city storm water drain.


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13.0 SOLID WASTE MANAGEMENT SYTEM

The general garbage generated from the residential will be the rate of 450grams per capita per day. The total garbage waste generated will be (Total 6925 persons x0.45kgs) 3116kgs. Per day. There will be a provision of garbage collection room in the basement. The garbage waste will be segregated at source into organic and inorganic wastes. Approximately 1247kgs. of organic waste will be taken to organic converter. The remaining 1869kgs. of inorganic waste will be further segregated into plastics and bottles and given to authorised recycler for further processing.

Approximately, the sewage contains 5 -8% of solids. The sludge generated from the STP will be taken through filter press and used as a manure for gardening. Approximately 20kgs. of sewage solids will be used as manure for garden. MATERIALS RECOMMENDED: Sanitary and waste pipes shall be SWR (PVC) As IS 13592 CLASS -B Rain Water pipes shall be SWR (PVC) As IS 13592 CLASS –A Pipes up to 50mm dia shall be CPVC- SDR-11. The pipes 65mm and higher diameter shall be CPVC SCH-40.


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C FIRE HYDRANT, SPRINKLER, AUTOMATIC FIRE DETECTION AND

ALARM SYSTEM 1.0 CONCEPT

Providing fire suppression system in a building is an attempt to extinguish the fire while it is small, or to limit its growth in order to prevent it from becoming large and spreading other parts of the building. Water is the most common and convenient fire-extinguishing agent. However, the most suitable extinguishing system whether water, powder or gases will depends on the nature of the combustible materials.

2.0 LIST OF DESIGN INPIUT PARAMETERS

The proposed fire protection system conforms to the requirements of Amendments No. 3, January 1997 to National building code of India 2005 (SP7:2005 Part-IV)

The proposed residential apartment building comprising of two basement +14 upper floors with the above ground height is approx.44.9 mtrs.

Source of water for Fire fighting is from tanker. And also from Bangalore Metro water supply line.

3.0 SYSTEM DESCRIPTION AND DISCUSSION

The following types of system will be provided.

a. Fire water pumping system

b. Wet riser & hose reel system.

c. Down comer

d. Automatic sprinkler system. Sprinklers in basement parking area only.

e. Yard Hydrant system

f. Portable fire extinguisher

g. Pumping system

h. Fire safety plans

i. Automatic Fire detection and alarm system.

4.0 CONCLUSIONS

The complete fire protection has been provided to conform to the stipulations of NBC. Various systems as described above will be provided.

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