1. Bachupally, Nizampet (S.O), Hyderabad-500090, AP
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)
B.Rani (11075A0117)
M.Mahesh (11075A0124)
UNDER THE GUIDANCE OF
Dr. B. Nagamalleswara Rao
Professor & Head
Department of Civil Engineering
VNR Vignana Jyothi Institute of Engineering &Technology,
Bachupally, Nizampet (S.O), Hyderabad , AP

2. CONTENTS 1. INTRODUCTION 2. OBJECTIVES 3. LITERATURE REVIEW
4. METHODOLOGY
5. TIME SCHEDULE
6. APPLICATIONS
7. REFERENCES

3. 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.

4. 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.
1.INTRODUCTION

5. Hydrological cycle

6. 2.OBJECTIVES
Design of rain water harvesting system components.
Implementation of rain water harvesting system in D Block of VNRVJIET campus
Cost benefit analysis

7. 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 September 2007.
ACHAYRA, B. P. (2004). Managing Water Sector Institution - HMWSSB Experience (Presen-tation). Hyderabad Metropolitan Water Supply and Sewerage Board, Hyderabad.

8. 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

9. COMPONENTS OF RWHS Roof Catchment Drain pipes Down pipes
First Flush Pipe
Storage Tank
Pump Unit

10. COST BENEFIT ANALYSIS AND DOCUMENTATION
5.TIME SCHEDULE
S.NO.
ACTIVITY
DURATION
DATES
STATUS 1.
LITERATURE REVIEW
6 WEEKS
UNDER PROGRESS 2.
DATA COLLECTION
4 WEEKS 3.
DESIGNING
8 WEEKS 4.
COST BENEFIT ANALYSIS AND DOCUMENTATION
3 WEEKS 5
IMPLEMENTATION -

11. 6. APPLICATIONS To arrest decline in ground water levels.
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.

12. Rainfall data Jan Feb Sep Oct Nov Dec Mar Apr May June July Aug 2003
10.7
11.7
27.3
65.5
265
144
54.9
168
2004
38.9
0.6
32.4 59
41.9
29.4
221
68.7
118.2
72.8
0.2
2005
39.7
10.3
18.7
24.8
21.8
88.9
369
115
220
2006
41.8
67.9
100
83.8
192
237
206
15.7
52.2
2007 23
11.5
113.3
92.8
214
266
18.1 21
2008
69.2
166
13.8
20.8
40.2 96
464
199 48
2009
2.1
17.3 69
55.5
353
145
69.6 28
4.4
2010
6.3
2.7
17.4
150.8
339
216
231
46.8
15.2
2011
25.2
1.7
6.9
35.6
185
234
76.9 70
8.4
2012
0.3
18.3
4.8
132
232
143
114
78.1
39.5
2013 17
74.5
10.2
203.2
197
124
155
239 14

13. DESIGN OF RWHS COMPONENTS

14. 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 = sqm

15. ROOF PLAN

16. DESIGN OF RWHS
Area of catchment = 2351 m2 Annual arerage rainfall = 887 mm = 0.887m Runoff co-efficient = 0.85 Volume of runoff = area of catchment x annual average rainfall x runoff co-efficient = 2351 x x 0.85 = 1773 m3/yr

17. DESIGN OF RWHS
Average value of highest rainfall in rainy days = 94mm =0.094m Volume of Runoff = 2351 x x 0.85 = 188 m3/day For economical design considering half of the discharge as volume of tank Volume of tank = 94 m3

18. DESIGN OF RWHS
Assume depth of tank = 2m Area 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

19. DESIGN OF CONDUITS
Head loss hf =

20. COST BENEFIT ANALYSIS
Volume of water collected in a year through RWHS = m3/yr
= litres/yr
Volume of water collected in
year excluding 20% overflow = x 0.8
= litres/yr
We use daily one tanker of 20,000 litres capacity
Volume of water used per day = ,000 litres
Cost of one tanker = Rs.1000/-

21. 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/-

22. Total cost of water that can be collected by RWHS = 1418400 x 0
Total cost of water that can be collected by RWHS = x 0.05 = Rs.70,920/- Amount of money saved = Rs.70,920/-

23. 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 September 2007.
ACHAYRA, B. P. (2004). Managing Water Sector Institution - HMWSSB Experience (Presen-tation). Hyderabad Metropolitan Water Supply and Sewerage Board, Hyderabad.

24. THANK YOU