Transcript Slide 1

WAT E R M A N A G E M E N T S Y S T E M
FOR A HOSTEL BLOCK OF
J A D AV P U R U N I V E R S I T Y,
K O L K ATA
A PRESENTATION BY :
PROBHASH KUMAR BISWAS
TIRTHANKAR SARKAR
WE HAVE PROPOSED A WATER MANAGEMENT SYSTEM IN A PART OF JADAVPUR
UNIVERSITY MAIN HOSTEL, KOLKATA, WHERE WATER IS WASTED CASUALLY. THE
WASTAGE OF WATER IS HARD TO BE REDUCED IN SUCH A PLACE LIKE THIS
HOSTEL. SO WE AS ARCHITECTS HAVE TO REDUCE THE EXPENSES ON
PROCURING THE REQUIRED WATER BY DESIGNING A PROPER SYSTEM OF
WATER MANAGEMENT.
 UN TREATED POND WATER IS NEVER RECYCLED.
 WASTAGE OF RAIN WATER AS IT DRAINS INTO THE
MUNICIPAL DRAINAGE SYSTEM.
 NO SCREENING SYSTEM OF THE STORM WATER.
PREVAILING CLIMATIC CONDITIONS
MAXIMUM TEMPERATURE IS RECORDED DURING MAY – 35.2° C
MINIMUM TEMPERATURE IS RECORDED DURING JANUARY – 14.1° C
ANNUAL AVERAGE RAINFALL IS 1.191 M. THE FOUR MONSOON
MONTHS (JUNE TO SEPTEMBER) CONTRIBUTE ABOUT 89% OF THE
TOTAL ANNUAL RAINFALL.
STORAGE
TANK
PUMP
MAXIMUM WATER LEVEL
INFILTRATION
GALLERY
PUMP
SEPTICTANK
GREY WATR FILTER
CUM FLOCCULATOR
RECYCLING OF GREY WATER
DISCHARGING
OF
BLACK WATER
TO
GROUND
THROUGH
SOAK PIT
SAND LAYER
SUPPORTING WALL
BRICK BALLAST
INFILTRATION
GALLERY
TO STORAGE TANK
PORUS CERAMIC
PIPE OF Φ150 MM
BRICK VAULT
CONTAINING
WEEPHOLES
RECHARGE PIT
COLLECTING WATER
FROM ROAD RUN OFF
SOAK PIT
HYACINTH
TILAPIA
GREY WATER FROM TOILETS
PUMPED TO POND
POND
USED IN TOILETS
FOR BATHING AND
WASHING
INFILTRATION
GALLERY
FLUSHING OF
WATER
CLOSETS
PUMPED UP TO ROOFTOP STORAGE TANK
STORAGE
TANK
DISINFECTANT ADDED
Considering the area around Jadavpur :Annual average rainfall is 1.919 m (say 1.9 m)
No. of rainy days are 146.
No. of non rainy days are 219.
RAIN WATER HARVESTING
FOR DRINKING PURPOSES
Roof top harvesting potential of the ‘D-Block’ :Area of terrace is 325 sqm
Runoff coefficient for roof is 0.85 (85%)
Volume of rainfall on the terrace is ( 325 sqm X 1.9 m X 0.85 ) = 524.9 cum (say 525 cum)
By proper harvesting procedure we can harvest at most 70% of the total rainfall.
Volume of water that can be harvested = (525 X 0.7) = 367.5 cum
Storage potential :Nos. of boarders in the hostel = 100 (maxim.)
Per capita consumption for drinking and cooking = 10 litres.
Yearly water requirement for drinking and cooking = (100 X 10 X 365) = 365000 litres
= 365 cum of water
< 367.5 cum.
Hence if we design a rain water storage tank of size 12 m X 10 m X 3.25 m = 390 cum,
it would be good enough to store drinking and cooking water for use, throughout the year.
# [Provided that the water is properly harvested and purified.]
SEMI UNDERGROUND WATER STORAGE TANK
SOLAR WATER PURIFIER
ROOF TOP WATER RESERVOIR
SOLAR WATER PURIFIER
PURPOSE
QUANTITY OF WATER
REQD.
DRINKING
2.5 LITRE
COOKING
4.5 LITRE
ABLUTION
18 LITRE
WASHING CLOTHES
15 LITRE
BATHING
30 LITRE
OTHER WASHINGS
35 LITRE
FLUSHING OF W.C.
30 LITRE
TOTAL
OBTAINED FROM RAINWATER HARVESTING
PRODUCING GREY WATER
PRODUCING BLACK WATER
INTAKE
FROM
POND
135 LPCD
OUT OF THE 98 LITRES OF GREY WATER SAY 85 % IS SENT BACK TO THE POND FOR RECYCLE BY EACH PERSON
EACH DAY.
HENCE ( 0.85 x 98 = ) 83.3 LITRES OF WATER IS RETURNED OUT OF 128 LITRES TAKEN FROM THE POND BY
EACH PERSON EACH DAY.
SO EACH PERSON DOES NOT RETURN ( 128 – 83.3 = ) 44.7 LITRES OF WATER TO THE POND EACH DAY.
SO 100 PERSONS IN 219 DRY DAYS DOES NOT RETURN ( 44.7 x 219 x 100 =) 978930 LITRES OR 978.93 CUM OF
WATER TO THE POND WHICH HAS A CAPACITY OF ABOUT 15000 CUM OF WATER.
HENCE ONLY ABOUT 6 . 5 % OF WATER IS REDUCED FROM THE POND DURING NON-RAINY DAYS IN A YEAR,
WHICH IS NEGLIGIBLE COMPARED TO THE RAIN FALLING ON THE POND IN THE RAINY DAYS.
CONCEPT :
 TRADITIONALLY IN THE VILLAGES OF INDIA PEOPLE USE TO BATH IN PONDS. SO INSPITE OF
HAVING A HUGE WATER BODY IN THE VICINITY,
WHY SHOULD WE SIP UP THE VALUABLE
UNDERGROUND WATER FOR NON POTABLE PURPOSES?
EFFECTIVE DESIGNING:
 WE ARE OBTAINING BATHING AND WASHING WATER FROM THE POND IN A PURE FORM WITHOUT
HAMPERING THE ECOLOGICAL SYSTEM OF IT.
 RAINWATER IS BEING HARVESTED FOR PROVIDING DRINKING WATER THROUGH OUT THE YEAR BY
PURIFICATION USING SOLAR ENERGY.
 AFTER ALL WE ARE ABLE TO PROPOSE A WATER SYSTEM INDEPENDENT OF UNDERGROUND
WATER SOURCES, EXCEPT DURING SOME ACCIDENTAL OR NATURAL DISASTROUS CAUSES.
MAINTAINABILITY:
 THE SAND BED OVER THE INFILTRATION GALLERY NEEDS TO BE REPLACED AFTER PERIODIC
INSPECTION, MAY BE AFTER EVERY 6 TO 12 MONTHS.
 THE GREYWATER FILTER NEEDS TO BE CLEANED PERIODICALLY, MAY BE MONTHLY OR
BIMONTHLY.
COST EFFECTIVENESS:
 THE ENTIRE PROJECT REQUIRES ONE TIME INSTALLATION COST,WHICH IS NOT TOO HIGH AND
REQUIRES MINIMUM MAINTENANCE.