UNDER THE GUIDANCE OF

Dr. B. Nagamalleswara RaoProfessor & Head

DESIGN AND IMPLEMENTATION OF ROOFTOP RAINWATER HARVESTING SYSTEM(RRHS)

FOR D-BLOCK OF VNRVJIET CAMPUS By• G.Sandhya Rani (10071A0174)

• J.Sai Kiran (10071A0176) • K.Sravan kumar (10071A0185)

Department of Civil Engineering VNR Vignana Jyothi Institute of Engineering &Technology,

Bachupally, Nizampet (S.O), Hyderabad-500090, AP

• B.Rani (11075A0117)• M.Mahesh (11075A0124)

CONTENTS

1. INTRODUCTION2. OBJECTIVES 3. LITERATURE REVIEW4. METHODOLOGY5. TIME SCHEDULE6. APPLICATIONS7. REFERENCES

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1.INTRODUCTION Water is the most common or major substance on earth, covering more than 70% of the planets surface. The total amount of water on earth remains constant.

The rapid growth in population together with industrial development, are putting stress on the natural ecosystems.

Water supply mainly depends on the natural water bodies likes lakes and artificial water bodies like reservoirs etc.

Due to the Urbanisation and rapid growth in the population many lakes has been lost and the majority of the present were polluted .

This results in the imbalance of demand and supply of water.

To overcome supply shortages, many households, businesses and industries fall back on groundwater reserves. The number of bore wells increased.

1.INTRODUCTION

This is leading to the fall in the ground water table.

One possible strategy could be the usage of rainwater in order to overcome the shortage of water.

Rain water harvesting means to make optimum use of rain water at the place where it falls i.e. conserve it and not allowing it to drain away.

The water can be used as drinking water, water for livestock, water for irrigation or to refill aquifers in a process called ground water recharge.

The rainwater falling on roof of residential buildings and institutions can be an important contribution to the availability of water.

Hydrological cycle

2.OBJECTIVES

Design of rain water harvesting system components.

Implementation of rain water harvesting system in D Block of

VNRVJIET campus

Cost benefit analysis

3. LITERATURE REVIEW

SIVARAMAN , K.R. & THILLAIGOVINDARAJAN S.. (2003), Manual on Rainwater Har-vesting. Chennai, Akash Ganga.

ARIYABANDU R. D. S. (2003). Very-Low-Cost Domestic Roof Water Harvesting in theHu-mid Tropics: Its Role in Water Policy.Sri Lanka Domestic Roofwater Harvesting Research Pro-gramme.

John Vidal (2006), “Crying out for Water”, The Hindu, Thursday, March 16, Kochi.

ASCI. (2005). City Development Strategy for Hyderabad: Poverty and Profile. Administrative Staff College of India, Hyderabad.

RAMACHANDRAIAH, C. (2007). Hyderabad’s Water Issues and the Musi River, Need for Integrated Solutions. Draft version of the Paper presented in the International Water Confe-rence, Berlin during 12-14 September 2007.

ACHAYRA, B. P. (2004). Managing Water Sector Institution - HMWSSB Experience (Presen-tation). Hyderabad Metropolitan Water Supply and Sewerage Board, Hyderabad.

4. METHODOLOGY

Collecton of the building data.

Collection of rainfall data of past 10 years.

Development of I-D-F curves of Hyderabad city.

Design of RWHS components

Implementation

COMPONENTS OF RWHS

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• Roof Catchment• Drain pipes• Down pipes• First Flush Pipe• Storage Tank• Pump Unit

5.TIME SCHEDULE

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S.NO.

ACTIVITY DURATION DATES STATUS

1. LITERATURE REVIEW

6 WEEKS 23.09.2013 -

02.11.2013

UNDER PROGRESS

2. DATA COLLECTION 4 WEEKS 04.11.2013 -

30.11.2013

3. DESIGNING 8 WEEKS 02.12.2013 -

25.01.2014

4. COST BENEFIT ANALYSIS AND

DOCUMENTATION

3 WEEKS 27.01.2014 -

15.02.20145 IMPLEMENTATION 4 WEEKS 17.02.2014

-15.03.2014

6. APPLICATIONS To overcome the inadequacy of water to meet our

demands. To arrest decline in ground water levels. To increase availability of ground water at specific place

and time and utilize rainwater for sustainable development.

To increase infiltration of rainwater in the subsoil which has decreased drastically in urban areas.

To reduce the expenditure spent on water.

Rainfall data

Jan Feb Mar Apr May June July Aug Sep Oct Nov Dec2003 0 10.7 11.7 27.3 0 65.5 265 144 54.9 168 0 0

2004 38.9 0.6 32.4 59 41.9 29.4 221 68.7 118.2 72.8 0.2 0

2005 39.7 10.3 18.7 24.8 21.8 88.9 369 115 220 221 0 0

2006 0 0 41.8 67.9 100 83.8 192 237 206 15.7 52.2 0

2007 0 0 0 23 11.5 113.3 92.8 214 266 18.1 21 0

2008 0 69.2 166 13.8 20.8 40.2 96 464 199 48 48 0

2009 0 0 2.1 23 17.3 69 55.5 353 145 69.6 28 4.4

2010 6.3 2.7 0 0.6 17.4 150.8 339 216 231 55.5 46.8 15.2

2011 0 25.2 1.7 6.9 1.7 35.6 185 234 76.9 70 8.4 0

2012 0.3 0 0 18.3 4.8 132 232 143 114 78.1 39.5 0

2013 0.3 17 0 74.5 10.2 203.2 197 124 155 239 14 0

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DESIGN OF RWHS COMPONENTS

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DESIGN OF RWHS

• Roof catchment: The area of the roof from which the rain water is collected.

• The total area of the catchment roof for D block = 2351 sqm

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ROOF PLAN

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DESIGN OF RWHS

Area of catchment = 2351 m2

Annual arerage rainfall = 887 mm = 0.887mRunoff co-efficient = 0.85

Volume of runoff = area of catchment x annual average rainfall x runoff co-efficient = 2351 x 0.887 x 0.85 = 1773 m3/yr

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DESIGN OF RWHS

Average value of highest rainfall in rainy days = 94mm =0.094m

Volume of Runoff = 2351 x 0.094 x 0.85 = 188 m3/dayFor economical design considering half of the discharge

as volume of tankVolume of tank = 94 m3

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DESIGN OF RWHS

Assume depth of tank = 2mArea of tank = volume of the tank/depth = 94/2 = 47m2 = 50m2(approx.)Taking Length: Breadth ratio as 2:1 L = 2B 2B x B = 50 B = 5m L = 10m

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DESIGN OF CONDUITS

• Head loss hf =

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COST BENEFIT ANALYSIS

Volume of water collected in a year through RWHS = 1773 m3/yr

= 1773000 litres/yr

Volume of water collected in year excluding 20% overflow = 1773000 x 0.8 = 1418400 litres/yr

We use daily one tanker of 20,000 litres capacity

Volume of water used per day = 20,000 litres

Cost of one tanker = Rs.1000/-

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Cost of one litre of water =

=

Total cost of water = cost of water purchased in a purchased per year day x No. of days water used in a year. = 1000 x 242 = Rs.2,42,000/-

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Total cost of water that can be collected by RWHS = 1418400 x 0.05 = Rs.70,920/-

Amount of money saved = Rs.70,920/-

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7. REFERENCES

SIVARAMAN , K.R. & THILLAIGOVINDARAJAN S.. (2003), Manual on Rainwater Har-vesting. Chennai, Akash Ganga.

ARIYABANDU R. D. S. (2003). Very-Low-Cost Domestic Roof Water Harvesting in theHu-mid Tropics: Its Role in Water Policy.Sri Lanka Domestic Roofwater Harvesting Research Pro-gramme.

John Vidal (2006), “Crying out for Water”, The Hindu, Thursday, March 16, Kochi.

ASCI. (2005). City Development Strategy for Hyderabad: Poverty and Profile. Administrative Staff College of India, Hyderabad.

RAMACHANDRAIAH, C. (2007). Hyderabad’s Water Issues and the Musi River, Need for Integrated Solutions. Draft version of the Paper presented in the International Water Confe-rence, Berlin during 12-14 September 2007.

ACHAYRA, B. P. (2004). Managing Water Sector Institution - HMWSSB Experience (Presen-tation). Hyderabad Metropolitan Water Supply and Sewerage Board, Hyderabad.

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THANK YOU