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IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
__________________________________________________________________________________________
Volume: 03 Special Issue: 03 | May-2014 | NCRIET-2014, Available @ http://www.ijret.org 526
ANALYZING THE RAINFALL AND TEMPERATURE INFLUENCE ON
MUNICIPAL WATER CONSUMPTION USING REGRESSION
TECHNIQUE
Surendra H J1
, Ganesh S P2
, Pruthvi Raj V3
, Paresh Chandra Deka4
1
Research Scholar (NITK) & Asst. Professor Civil Department, REVA ITM, Karnataka, India
2
UG Student, Civil Department, REVA ITM, Karnataka, India
3
UG Students, Civil Department, REVA ITM, Karnataka, India
4
Associate Professor, Applied Mechanics & Hydraulics, NITK Surathkal, Karnataka, India
Abstract
Water is known as an important resource. Many factors influencing the water consumption, identifying the factors influencing the
water consumption is an active area of research work. This research aims at studying the relationship among the climatic variables
such as rainfall and temperature & its influence on water consumption using regression technique. For this purpose rainfall,
maximum and minimum temperature and water consumption data were collected on monthly basis and it is divided into two parts
training and testing. Model performance is evaluated using correlation coefficient (CC), Prediction error (PE), Root mean square
error (RMSE) and Accuracy. From the result it is cleared that regression technique can be used effetely for the prediction purpose
and rainfall and temperature variables is influences the water consumption.
Keywords: Rainfall, Temperature, Water consumption, Regression technique
----------------------------------------------------------------------***--------------------------------------------------------------------
1. INTRODUCTION
Climatic behavior prediction is one of the challenging tasks to
meteorological society all over the world. Its variability is
directly influence on many sectors such as agriculture, water
etc. So it is necessary to determine the relationship among the
climatic variables and its influence on these sectors. In this
research work, influence of climatic variables such as rainfall,
maximum and minimum temperature on water consumption in
an urban area is analyzed using regression technique. [6]
examined climatic variability of the city using multivariate
analysis, result indicate that annual water use is controlled
most by the overall state of drought, autumn temperature and
summer monsoon precipitation. [3] Analyzed daily water use
in a water distribution zone by using simple time series
approach. Here they have shown how threshold level of
temperature and rainfall were identified. [4] Describes and
compared a series of predictive model for forecasting hourly
water demand. [7] Explores the strategies to improve water
management by tracking, anticipating and respond to seasonal
to interannual climatic variability and climatic change. [5]
Investigated the influence of seasonal and explanatory
variables on water consumption. [1] Investigated the complex
understanding of how temperature affects water use pattern.
Geographical information system and statistical analysis is
used to compare the spatial relationship among single family
residential water use pattern, water use characteristics and
temperature. [2] Forecasted the water consumption using
multiple linear regression model using variables such as
population served, monthly mean temperature and monthly
total precipitation. [8] Investigates whether there is a
statistically significant impact of short term climate variables
(especially air temperature and rainfall) on residential water
consumption at two selected case sites in the Czech Republic
using daily time series data.
1.1 Study Area
The present study area covers the Yelahanka city located at
13006'30'' to 77034'15'' which is a suburb of Bangalore in
the state of Karnataka. It is located near the fast developing
northern section of Greater Bangalore, about 14 kilometers
from downtown Bangalore. State Highway 9, Bangalore-
Hindupur passes through Yelahanka bisecting the suburb into
Old Town and New Town. Yelahanka is at a height of about
915m above mean sea level. Due to its higher altitude from
mean sea level, it is lush green and has pleasant weather year
round. The summer season lasts from March to mid-May, with
a temperature in the range 200-350. At the end of May, the
monsoon season starts and lasts until the end of October.
There are about 1143mm of rainfall annually. Yelahanka is
served by both South west as well as South east monsoon.
Winters are mild and last from November to February, with a
temperature in the range 140-240. Variation of rainfall is
represented in the figure 1. Seasonal variations of rainfall for
last two years is compared & represented in the figure 2.
IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
__________________________________________________________________________________________
Volume: 03 Special Issue: 03 | May-2014 | NCRIET-2014, Available @ http://www.ijret.org 527
Similarly variation of monthly maximum and minimum
temperature and water consumption is represented in the
figure 3 and 4 respectively
Fig1: Time series plot of monthly rainfall
Fig 2: Time series plot of seasonal rainfall of last two years
Fig 3: Time series plot of monthly maximum and minimum temperature
Fig 4: Time series plot of monthly water consumption
12.00
17.00
22.00
27.00
32.00
37.00
MaxandMin
Temperature
Months
Max Temperature Min Temperature
0
10000000
20000000
30000000
40000000
Consumptioninlitres
months
0.0
100.0
200.0
300.0
400.0
Jan
feb
march
april
may
june
july
august
sept
octo
nove
decem
jan
feb
march
april
may
june
july
august
sept…
oct…
nov…
dec…
Rainfallinmm
Months
86 0 212 85 232163 2
585
160 143
0
200
400
600
800
summer winter Monsoon Premonsoon Post monsoon
Rainfallinmm
seasons
Rainfall in mm, 2012 Rainfall in mm, 2013
IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
__________________________________________________________________________________________
Volume: 03 Special Issue: 03 | May-2014 | NCRIET-2014, Available @ http://www.ijret.org 528
1.2 Model Development and Methodology
Identifying the appropriate input variables which influence
water consumption, determines the model structure and also
plays important role in the model results Hence input variable
is selected based on the correlation coefficient (CC). CC value
of all the variables were represented in the table1. For the
analysis purpose water consumption, rainfall, maximum and
minimum temperature data is collected on monthly basis and it
is divided into training and testing part. Statistical properties
of the data set are represented in the table 2.
Table-1: correlation coefficient of all the variables
Table-2: statistical properties of all the variables
variables Maximum minimum Mean S.D C.V skewness
Rainfall 374.0 0.0 72.8 84.9832 1.1668 2.7905
Min temperature 22.9 15.1 19.2 2.2081 0.1153 -0.3480
Max temperature 35.1 27.3 29.4 2.3710 0.0808 1.6399
Water consumption 373849382 232793397 310426447 52092549.6884 0.1678 -0.3564
1.3 Regression Method
In this research work regression model developed is in the
following form;
Y=β0+ β1x1+ β2x2 + β3x3
This is the multiple regression equation with three independent
variables and one dependent variable Y. where Y is the target
strength. Here linear regression used because equation is linear
function of the unknown parameter β0, β1, β2, β3 & hence it is
called as partial regression coefficient.
1.4 Performance Evaluation
1.4.1 Correlation Coefficient (CC)
It is measure of the strength of the linear relationship between
two variables. It is defined in terms of the covariance of the
variables divided by their standard deviations.
CC =
∑ x − x′
y − y′
√ x − x′ y − y′ ²
1.4.2 Root Mean Square Error (RMSE)
It is used to measure the prediction accuracy between the
predicted model and actually observed model.
RMSE = x − y 2/N
1.4.3 Prediction Error
PE = [
Y − X
X
)
If the PE value is close to 0, then the model is treated as best
one.
1.4.4 Accuracy
100 − RMSE
Where,
N= the number of data pattern in the independent data set.
x= the observed values
y= the predicted values
x′
= Mean of the observed values.
y′
= Mean of the predicted values
2. RESULTS AND DISCUSSION
Table 3, shows the results of regression technique. Due to
limitation of the data set, only few years of data is used for
analysis purpose. Due to that there is an error obtained which
shows that predicted value is deviated from the observed
values. The result shows that accuracy obtained almost near to
76% and prediction error is negative because observed water
consumption value is more compared to the predicted one.
Correlation coefficient of the predicted model is 0.692, which
shows that the result is fairly good. From the overall
Correlation coefficient Rain Fall Min temperature Max Temperature Water Consumption
Rain Fall 1.000 0.270 -0.122 0.265
Min temperature 0.270 1.000 0.624 0.128
Max Temperature -0.122 0.624 1.000 0.019
Water Consumption 0.265 0.128 0.019 1.000
IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
__________________________________________________________________________________________
Volume: 03 Special Issue: 03 | May-2014 | NCRIET-2014, Available @ http://www.ijret.org 529
performance we can say regression model is capable for the
prediction purpose, also rainfall and temperature influences
the water consumption.
Table 3: Results of all the performance evaluation
Regression Technique
CC
Prediction
Error RMSE
Accuracy
(%)
0.692 -0.258 21.50 76.18
3. CONCLUSIONS
In this work an attempt is made to find out the influence of
rainfall and temperature on municipal water consumption
using regression technique. Due to limitations of the data set,
only two years of data were used for the analysis. Since some
other parameters influences the water consumption & data also
less, obtained accuracy is less. But From the performance
evaluation obtained accuracy is fairly good and it can be
acceptable; hence it can be used efficiently for prediction
purpose.
FUTURE WORK
Accuracy of the model can be improved by using some more
variables influencing the water consumption with large no of
years of data set. Also advance soft computing techniques
such as fuzzy logic, neural network, adaptive neural fuzzy
inference system, wavelet transformer can be used to improve
the accuracy of the model etc.
ACKNOWLEDGEMENTS
Authors are thankful to Disaster management cell, yelahanka,
Bangalore and BWSSB for providing climatic as well as water
consumption data. Also a special thanks to all the faculty
members of the civil department and principal Dr.R.P.Reddy
sir for his continuous support to all the work.
REFERENCES
[1] Breyer B., Chang H., Parandvash H (2012). “Land –
use, temperature and single –family residential water
patterns in Portland, Oregon and Phoenix, Arizona”.
Journal of Applied geography 35(2012)142-151.
[2] Birge O., Ali yurdusev M., Turan M (2013). “Urban
water demand forecasting based on climatic change
scenarios”. 2nd International conference on challenge
of civil Engineering, BCCCE, 23-25, amy 2013, Epoka
University, Tiruna, Albania.
[3] Gato, S., Jayasuriya, N., Roberts, peter., 2007.
Temperature and rainfall thresholds for base urban
water demand modeling. Journal of hydrology
337(2007): 364-376.
[4] Herrera, M., Torgo, L., Izquierdo, J., Garcia, R., 2010.
Predictive models for forecasting hourly urban water
demand. Journal of hydrology 387 (2010): 141-150.
[5] Kossay K (2011). “Calculating and modeling of indoor
water consumption factor in Mosal city, Iraq”. Journal
of Environmental studies, Vol. 6, pp: 39-52.
[6] Robert. C., Balling Jr., Patricia Gober (2006).
“Climatic Variability and Residential water use in the
city of Phoenix, Arizona”. Journal of Applied
Meteorology and Climatology, Vol.46, pp; 1130-1136.
[7] Sharma K.D., Gosain A.K (2010). “Application of
climatic Information and predictions in water sector:
Capabilities”. Journal of Environmental sciences,
Vol.1, pp: 120-129.
[8] Slavikova . L., Maly V., Rost M., Petruzela L., Vojacek
O (2013).” Impacts of Climatic Variables on
Residential Water Consumption in the Czech
Republic”. Water Resource Manage, Vol.27, 365-379.

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Analyzing the rainfall and temperature influence on municipal water consumption using regression technique

  • 1. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 __________________________________________________________________________________________ Volume: 03 Special Issue: 03 | May-2014 | NCRIET-2014, Available @ http://www.ijret.org 526 ANALYZING THE RAINFALL AND TEMPERATURE INFLUENCE ON MUNICIPAL WATER CONSUMPTION USING REGRESSION TECHNIQUE Surendra H J1 , Ganesh S P2 , Pruthvi Raj V3 , Paresh Chandra Deka4 1 Research Scholar (NITK) & Asst. Professor Civil Department, REVA ITM, Karnataka, India 2 UG Student, Civil Department, REVA ITM, Karnataka, India 3 UG Students, Civil Department, REVA ITM, Karnataka, India 4 Associate Professor, Applied Mechanics & Hydraulics, NITK Surathkal, Karnataka, India Abstract Water is known as an important resource. Many factors influencing the water consumption, identifying the factors influencing the water consumption is an active area of research work. This research aims at studying the relationship among the climatic variables such as rainfall and temperature & its influence on water consumption using regression technique. For this purpose rainfall, maximum and minimum temperature and water consumption data were collected on monthly basis and it is divided into two parts training and testing. Model performance is evaluated using correlation coefficient (CC), Prediction error (PE), Root mean square error (RMSE) and Accuracy. From the result it is cleared that regression technique can be used effetely for the prediction purpose and rainfall and temperature variables is influences the water consumption. Keywords: Rainfall, Temperature, Water consumption, Regression technique ----------------------------------------------------------------------***-------------------------------------------------------------------- 1. INTRODUCTION Climatic behavior prediction is one of the challenging tasks to meteorological society all over the world. Its variability is directly influence on many sectors such as agriculture, water etc. So it is necessary to determine the relationship among the climatic variables and its influence on these sectors. In this research work, influence of climatic variables such as rainfall, maximum and minimum temperature on water consumption in an urban area is analyzed using regression technique. [6] examined climatic variability of the city using multivariate analysis, result indicate that annual water use is controlled most by the overall state of drought, autumn temperature and summer monsoon precipitation. [3] Analyzed daily water use in a water distribution zone by using simple time series approach. Here they have shown how threshold level of temperature and rainfall were identified. [4] Describes and compared a series of predictive model for forecasting hourly water demand. [7] Explores the strategies to improve water management by tracking, anticipating and respond to seasonal to interannual climatic variability and climatic change. [5] Investigated the influence of seasonal and explanatory variables on water consumption. [1] Investigated the complex understanding of how temperature affects water use pattern. Geographical information system and statistical analysis is used to compare the spatial relationship among single family residential water use pattern, water use characteristics and temperature. [2] Forecasted the water consumption using multiple linear regression model using variables such as population served, monthly mean temperature and monthly total precipitation. [8] Investigates whether there is a statistically significant impact of short term climate variables (especially air temperature and rainfall) on residential water consumption at two selected case sites in the Czech Republic using daily time series data. 1.1 Study Area The present study area covers the Yelahanka city located at 13006'30'' to 77034'15'' which is a suburb of Bangalore in the state of Karnataka. It is located near the fast developing northern section of Greater Bangalore, about 14 kilometers from downtown Bangalore. State Highway 9, Bangalore- Hindupur passes through Yelahanka bisecting the suburb into Old Town and New Town. Yelahanka is at a height of about 915m above mean sea level. Due to its higher altitude from mean sea level, it is lush green and has pleasant weather year round. The summer season lasts from March to mid-May, with a temperature in the range 200-350. At the end of May, the monsoon season starts and lasts until the end of October. There are about 1143mm of rainfall annually. Yelahanka is served by both South west as well as South east monsoon. Winters are mild and last from November to February, with a temperature in the range 140-240. Variation of rainfall is represented in the figure 1. Seasonal variations of rainfall for last two years is compared & represented in the figure 2.
  • 2. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 __________________________________________________________________________________________ Volume: 03 Special Issue: 03 | May-2014 | NCRIET-2014, Available @ http://www.ijret.org 527 Similarly variation of monthly maximum and minimum temperature and water consumption is represented in the figure 3 and 4 respectively Fig1: Time series plot of monthly rainfall Fig 2: Time series plot of seasonal rainfall of last two years Fig 3: Time series plot of monthly maximum and minimum temperature Fig 4: Time series plot of monthly water consumption 12.00 17.00 22.00 27.00 32.00 37.00 MaxandMin Temperature Months Max Temperature Min Temperature 0 10000000 20000000 30000000 40000000 Consumptioninlitres months 0.0 100.0 200.0 300.0 400.0 Jan feb march april may june july august sept octo nove decem jan feb march april may june july august sept… oct… nov… dec… Rainfallinmm Months 86 0 212 85 232163 2 585 160 143 0 200 400 600 800 summer winter Monsoon Premonsoon Post monsoon Rainfallinmm seasons Rainfall in mm, 2012 Rainfall in mm, 2013
  • 3. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 __________________________________________________________________________________________ Volume: 03 Special Issue: 03 | May-2014 | NCRIET-2014, Available @ http://www.ijret.org 528 1.2 Model Development and Methodology Identifying the appropriate input variables which influence water consumption, determines the model structure and also plays important role in the model results Hence input variable is selected based on the correlation coefficient (CC). CC value of all the variables were represented in the table1. For the analysis purpose water consumption, rainfall, maximum and minimum temperature data is collected on monthly basis and it is divided into training and testing part. Statistical properties of the data set are represented in the table 2. Table-1: correlation coefficient of all the variables Table-2: statistical properties of all the variables variables Maximum minimum Mean S.D C.V skewness Rainfall 374.0 0.0 72.8 84.9832 1.1668 2.7905 Min temperature 22.9 15.1 19.2 2.2081 0.1153 -0.3480 Max temperature 35.1 27.3 29.4 2.3710 0.0808 1.6399 Water consumption 373849382 232793397 310426447 52092549.6884 0.1678 -0.3564 1.3 Regression Method In this research work regression model developed is in the following form; Y=β0+ β1x1+ β2x2 + β3x3 This is the multiple regression equation with three independent variables and one dependent variable Y. where Y is the target strength. Here linear regression used because equation is linear function of the unknown parameter β0, β1, β2, β3 & hence it is called as partial regression coefficient. 1.4 Performance Evaluation 1.4.1 Correlation Coefficient (CC) It is measure of the strength of the linear relationship between two variables. It is defined in terms of the covariance of the variables divided by their standard deviations. CC = ∑ x − x′ y − y′ √ x − x′ y − y′ ² 1.4.2 Root Mean Square Error (RMSE) It is used to measure the prediction accuracy between the predicted model and actually observed model. RMSE = x − y 2/N 1.4.3 Prediction Error PE = [ Y − X X ) If the PE value is close to 0, then the model is treated as best one. 1.4.4 Accuracy 100 − RMSE Where, N= the number of data pattern in the independent data set. x= the observed values y= the predicted values x′ = Mean of the observed values. y′ = Mean of the predicted values 2. RESULTS AND DISCUSSION Table 3, shows the results of regression technique. Due to limitation of the data set, only few years of data is used for analysis purpose. Due to that there is an error obtained which shows that predicted value is deviated from the observed values. The result shows that accuracy obtained almost near to 76% and prediction error is negative because observed water consumption value is more compared to the predicted one. Correlation coefficient of the predicted model is 0.692, which shows that the result is fairly good. From the overall Correlation coefficient Rain Fall Min temperature Max Temperature Water Consumption Rain Fall 1.000 0.270 -0.122 0.265 Min temperature 0.270 1.000 0.624 0.128 Max Temperature -0.122 0.624 1.000 0.019 Water Consumption 0.265 0.128 0.019 1.000
  • 4. IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308 __________________________________________________________________________________________ Volume: 03 Special Issue: 03 | May-2014 | NCRIET-2014, Available @ http://www.ijret.org 529 performance we can say regression model is capable for the prediction purpose, also rainfall and temperature influences the water consumption. Table 3: Results of all the performance evaluation Regression Technique CC Prediction Error RMSE Accuracy (%) 0.692 -0.258 21.50 76.18 3. CONCLUSIONS In this work an attempt is made to find out the influence of rainfall and temperature on municipal water consumption using regression technique. Due to limitations of the data set, only two years of data were used for the analysis. Since some other parameters influences the water consumption & data also less, obtained accuracy is less. But From the performance evaluation obtained accuracy is fairly good and it can be acceptable; hence it can be used efficiently for prediction purpose. FUTURE WORK Accuracy of the model can be improved by using some more variables influencing the water consumption with large no of years of data set. Also advance soft computing techniques such as fuzzy logic, neural network, adaptive neural fuzzy inference system, wavelet transformer can be used to improve the accuracy of the model etc. ACKNOWLEDGEMENTS Authors are thankful to Disaster management cell, yelahanka, Bangalore and BWSSB for providing climatic as well as water consumption data. Also a special thanks to all the faculty members of the civil department and principal Dr.R.P.Reddy sir for his continuous support to all the work. REFERENCES [1] Breyer B., Chang H., Parandvash H (2012). “Land – use, temperature and single –family residential water patterns in Portland, Oregon and Phoenix, Arizona”. Journal of Applied geography 35(2012)142-151. [2] Birge O., Ali yurdusev M., Turan M (2013). “Urban water demand forecasting based on climatic change scenarios”. 2nd International conference on challenge of civil Engineering, BCCCE, 23-25, amy 2013, Epoka University, Tiruna, Albania. [3] Gato, S., Jayasuriya, N., Roberts, peter., 2007. Temperature and rainfall thresholds for base urban water demand modeling. Journal of hydrology 337(2007): 364-376. [4] Herrera, M., Torgo, L., Izquierdo, J., Garcia, R., 2010. Predictive models for forecasting hourly urban water demand. Journal of hydrology 387 (2010): 141-150. [5] Kossay K (2011). “Calculating and modeling of indoor water consumption factor in Mosal city, Iraq”. Journal of Environmental studies, Vol. 6, pp: 39-52. [6] Robert. C., Balling Jr., Patricia Gober (2006). “Climatic Variability and Residential water use in the city of Phoenix, Arizona”. Journal of Applied Meteorology and Climatology, Vol.46, pp; 1130-1136. [7] Sharma K.D., Gosain A.K (2010). “Application of climatic Information and predictions in water sector: Capabilities”. Journal of Environmental sciences, Vol.1, pp: 120-129. [8] Slavikova . L., Maly V., Rost M., Petruzela L., Vojacek O (2013).” Impacts of Climatic Variables on Residential Water Consumption in the Czech Republic”. Water Resource Manage, Vol.27, 365-379.