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A Report on Rain Water Harvesting

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 A Field Report On Rooftop Rain Water Harvesting in Kuvempu University The Green Varsity Goes Green By W Rorrkychand Singh Journalism and Mass-Communication The worl d is conf ront ing the pr oblem of na tural res ources constr ai n. Re al iz ing this gl obal phenomenon the Kuve mpu Univers it y is successfu ll y implementing a project on harvesting rooftop rain water harvesting since 2007. What is Rooftop Rain Water Harvesting (RRWH) The university has three harvesting stations, two buildings Shatamanutsava Bhavan and Guest House are flat with RCC roof and the third station in the Univer si ty’s Ind oor st adium has combination of pit ch and RCC roof . Ac co rdin g to th e data available in the en gin eer in g sect io n of th e unive rsity the tota l catch ment area of all the three station is 17 81. 73 sq ua re -meter, th e  big ge st ta nk is in Ku ve mpu Shatamanutsava Bhavan ha vin g stor ag e ca pacity of  76, 000 0 lit ers, and oth er two ha s 19,000 li te rs of storage capacity each. As per rainfall rate of 2010 data given by the Ga uging Sub-Division and Hydromet rologi ca l St at ion BRP, Shankargha tt a received 1399.5 mm rainfall in 2010. ROOFTOP RAIN WATER HARVESTING IN KUVEMPU UNIVERSITY 1 Rain Wat er Harve stin Tank in Sh atama nutsa va Bhav an
Transcript
Page 1: A Report on Rain Water Harvesting

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AField Report

On

Rooftop Rain Water Harvesting inKuvempu University

The Green Varsity Goes GreenBy

W Rorrkychand SinghJournalism and Mass-Communication

The world is confronting the problem of natural resources constrain.

Realizing this global phenomenon the Kuvempu University is successfullyimplementing a project on harvesting rooftop rain water harvesting since 2007.

What is Rooftop Rain Water Harvesting (RRWH)

The university has three harvesting stations, two buildings Shatamanutsava

Bhavan and Guest House are flat with RCC roof and the third station in the

University’s Indoor stadium

has combination of pitch andRCC roof. According to the

data available in the

engineering section of the

university the total catchment

area of all the three station is

1781.73 square-meter, the

  biggest tank is in Kuvempu

Shatamanutsava Bhavan

having storage capacity of 

76,0000 liters, and other two

has 19,000 liters of storage

capacity each. As per rainfall

rate of 2010 data given by the

Gauging Sub-Division and Hydrometrological Station BRP, Shankarghatta

received 1399.5 mm rainfall in 2010.

ROOFTOP RAIN WATER HARVESTING IN KUVEMPU UNIVERSITY  1

Rain Water Harvestin Tank in Shatamanutsava Bhavan

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Asst. Executive Engineer Kuvempu University Vasu S told that the rain

water harvesting system was implemented in the year 2007; the main aim was to

supplement the needs of water within the campus. The harvested water is mainly

use for sanitary needs but in the Shatamanutsava Bhavan a special treatment is

done to purify the water and it is connected with the auaguard supplementing the

scarcity of drinking water. Rooftop Rain Water harvesting in the University is of 

great success.

Inside the tank a sand filter is used to purify for a week the first rain is

diverted from the tank for cleaning the roof dirt’s and contamination. The rain

water harvested during the raining season is only last for 1-2 months, pumping

water is done to keep the tank full and to supply the needs, he added. 

Rooftop Rain water Harvesting iscollected from the rooftop of the

 buildings using rooftop space available

to collect water excluding the

 peripheral wall thickness and any other 

opening is the Effective Roof Area.

One can calculate the area by deviding

the roof area into convenient grids and

calculate the area of each grids For 

Example A1 grid can be measure as= X

x Y and add the individual grid area to

find the total roof area, i.e.

A1+A2+A3+A4+A5+A6+A7+A8... = A (Total area). (Source- The Karnataka State Council

for Science and Technology)

 

When inquired Dept. Water Management and Water Harvesting/ Dept. of 

Environmental Science Professor Dr. Narayana told the harvested water is for 

secondary use i.e. flushing, gardening, washing and sanitary, it’s mean to meet the

enormous water requirement for purposes within the campus. He added that to

make sure contamination free regular cleansing is done ensuring zero level of spreading epidemic diseases from RRWH.

KSCST recommends some precaution to ensure pollution free water 

Keep the roof or the water collection area clean before the rains.

Flush the rainwater collected for the first few minutes.

ROOFTOP RAIN WATER HARVESTING IN KUVEMPU UNIVERSITY  2

Sand Bed Filter 

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Store the collected rainwater in a closed container (avoid sunlight).

The quality of water deteriorates in the presence of sunlight and air.

Water can be kept clean over a period of five to six months in a clean

container stored in an enclosed area protected from sunlight.

In the university’s Guest House harvested rain water is used for washing,

cleansing and sanitary

  purposes said Asst.

Manager Guest House

Kuvempu University Manje

Gowda. The needs for water 

in Guest House is in great

demand as to keep the place

clean, everyday 1000

(approx) liters are used. Thetank is clean once a month

and drinking water and rain

harvested rain water are

separated by different

 pipelines he added.

Rainfall Rate of 2010

Month Rainfall in mM

January 15.0

February 0

March 0

April 81.8

May 39.4

June 166.5

July 324.6

August 294.0

September 178.2

October 139.8

 November 160.2

December 0

(Souce-The Gauging Sub-Division and Hydrometrological Station BRP)

ROOFTOP RAIN WATER HARVESTING IN KUVEMPU UNIVERSITY  3

Rain Water Harvesting Tank in Guest House

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Details of RRWH in Kuvempu University

Catchments area-

Kuvempu Shatamanutsava Bhavan 943 Sq m

Indoor Stadium 444.15 Sq m

Guest House 394.58 Sq m

Estimated cost-

Kuvempu Shatamanutsava Bhavan Rs. 76,000

Indoor Stadium Rs. 61,900

Guest House Rs. 50,200

Conduit Pipe-

In all stations

First Flush device-Manually diverted

Filters-

Sand filters

Storage tank type-

Underground

Quantity of rain water harvested-

Kuvempu Shatamanutsava Bhavan-76000liters

Indoor Stadium-19000 liters

Guest House- 19000liters

Total- 114000

Utilization of rain water-

Mainly for Flushing and gardening, potable in Kuvempu

Shatamanutsava Bhavan purifying through Auaguard

Ground water recharging- No in practice

Maintenance-

Periodical cleaning of roofs, storage tank and replacement of filter 

medium in filters

ROOFTOP RAIN WATER HARVESTING IN KUVEMPU UNIVERSITY  4

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Comparison of Physico-chemical characteristics of store rain water, Municipal

water, Bore well and Rain water sample with drinking water standard.SL

 NO

PARAMETER STORED

RAIN

WATER 

MUNICIPAL

WATER 

BORE

WELL

WATER 

RAIN

WATER 

BIS

STANDARD-

S

WHO

1 Color(HazenUnit)

0.0 0.0 0.0 0.0 5-25 5-25

2 Turbidity

(NTU)

0.7 0.3 0.0 0.0 5-25 5-25

3 Ph 7.84 7.69 7.58 6.32 6.5-9.2 6.5-

8.5

4 Electrical

conductivity

(µmhos/cm)

355 110 749 27.5 - -

5 TotalDissolves

Solids(mg/L)

175 54.3 411 14.55 500-2000 300-600

6 Total

Acidity

(mg/L)

20 15 75 7 - -

7 Total

Alkalinity

(mg/L)

102 48 318 10 200-600 200-

600

8 Total

Hardness

(mg/L)

96 36 324 11.6 300-600 300-

600

9 Calcium

(mg/L)

29.6 8.0 46.4 2.24 75-200 75-

200

10 Magnesium

(mg/L)

4.46 3.66 49.5 1.48 30-100 50-

150

11 Chloride

(mg/L)

42.54 18.43 72.31 8.48 250-1000 200-

600

Source: Department of Water management and water harvesting/ Environmental

Science Kuvempu University. 

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