WATER MANAGEMENT SYSTEM FOR A WATER MANAGEMENT SYSTEM FOR A HOSTEL BLOCK OF JADAVPUR UNIVERSITY, HOSTEL BLOCK OF JADAVPUR UNIVERSITY, KOLKATAKOLKATA

A PRESENTATION BY :

PROBHASH KUMAR BISWASTIRTHANKAR 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 CONDITIONSMAXIMUM 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.

DISCHARGING OF BLACK WATER TO GROUND THROUGH SOAK PIT

RECYCLING OF GREY WATER

GREY WATR FILTER CUM FLOCCULATOR

MAXIMUM WATER LEVEL

SEPTICTANK

SOAK PIT

INFILTRATION GALLERY

STORAGE TANK

PUMP

PUMP

SAND LAYER

BRICK BALLAST

SUPPORTING WALL

PORUS CERAMIC PIPE OF Φ150 MM

BRICK VAULT CONTAINING WEEPHOLES

TO STORAGE TANK

INFILTRATION INFILTRATION GALLERYGALLERY

RECHARGE PIT COLLECTING WATER FROM ROAD RUN OFF

GREY WATER FROM TOILETS

PUMPED TO POND

POND

HYACINTH TILAPIA

INFILTRATION GALLERY

STORAGE TANK

PUMPED UP TO ROOF-TOP STORAGE TANK

USED IN TOILETS FOR BATHING AND

WASHING

FLUSHING OF WATER

CLOSETS

DISINFECTANT ADDED

RAIN WATER RAIN WATER HARVESTING FOR HARVESTING FOR DRINKING PURPOSESDRINKING PURPOSES

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.

Roof top harvesting potential of the ‘D-Block’ :-Area of terrace is 325 sqmRunoff 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.]

SOLAR WATER PURIFIERSOLAR WATER PURIFIER

SEMI UNDERGROUND WATER STORAGE TANK

SOLAR WATER PURIFIERSOLAR WATER PURIFIER

ROOF TOP WATER RESERVOIR

PURPOSEQUANTITY 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 135 LPCD

OBTAINED FROM RAIN- WATER HARVESTING

PRODUCING GREY WATER

PRODUCING BLACK WATER

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.

INTAKE

FROM POND

CONCEPT :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: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: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:COST EFFECTIVENESS: THE ENTIRE PROJECT REQUIRES ONE TIME INSTALLATION COST,WHICH IS NOT TOO HIGH AND REQUIRES MINIMUM MAINTENANCE.