RESIDENTIAL WATER DEMAND ANALYSIS IN HILLA

Abstract

This paper investigates the analysis of residential water demand for the city ofHilla which is the main town in Babylon government in Iraq( Population of about258568 person , living in an area of 55 Km2 according to Central Committee ofStatistics – Babylon Census Directorate -1997) along with determining the factors thataffect such demand for the period from the 1st of January to the end of August -2004. The cross-section data which was weekly observed was collected by a survey made on a sample of randomly chosen dwellings from different districts of the city. A questionnaire survey was also made to collect all necessary informationseemed useful in estimating the daily consumption of domestic water. Demand relations are estimated for total residential, winter, summer, andSprinkling demands. Stepwise multiple regression analysis was employed to find the structuralrelationship between water demand per household per day and householdcharacteristics (factors) for each type of demand. All demand models were fitted in log-linear form. In this survey, the average daily water demand for the city of Hilla wasestimated to be 1721 L/h/d (273.2L/c/d) for total model, 586.13 L/h/d ( 93L/c/d) forwinter model , 2453 L/h/d( 389.4L/c/d) for summer model and 490 L/h/d(77.8L/c/d) forsprinkling model. The most significant factors affecting the demand appear in the fitted equation.Of these factors, household size was found to be significant variable in all demandmodels, while number of washbasins variable was found to be the significant variablein the total, winter, and summer model. The total built –up area of the house andnumber of showers was found to be the significant variables in the total and summermodels.