Full Description

The Peruvian Government has embarked on a major rehabilitation program for itswater and wastewater system. SEDAPAL is the governmental agency in charge of theoperation and maintenance of the water and sewerage system in Lima, Peru. Theagency provides services to approximately seven million people. Due to themagnitude of the system and the shortage of adequate personnel and equipment, thesystem has not received optimal maintenance, resulting in a high percentage ofunaccounted-for water, low pressure conditions, and less than perfect waterquality. The program study area of approximately of 21.6 square miles is locatedwithin Lima's metropolitan area. A total of ten districts, similar in size tocities in other countries, are included in the study area. Part of therehabilitation program includes the preparation of a computer model of the waterdistribution system. Specific sections of the system were selected as beingrepresentative of the system as a whole to be used for detailed field analysis. Theprimary purpose of the field analysis was to determine representative pipelinecoefficients of friction to use in the model and therefore, areas with onespecific type of pipe material and those known to include advanced pipe ageconditions were selected for investigation in the field. The model incorporatesall the physical characteristics of the distribution system, including pipelinelengths, diameters, materials of construction, elevations, and coefficients offriction (roughness coefficients). For each area tested in the field,measurements were made for the total flow consumption into the area and forpressure values at specific points distributed throughout the area. The resultsof the field measurements were compared to the results of the system model. Thiscomparison assisted in the determination of the theoretical coefficient offriction for each pipe material, and also assisted in performing necessaryadjustments to the amount of flow consumption based on high water losses andunexpected consumption conditions. This paper focuses on the interactive approachbetween field measurements and network model results for water distributionsystems that experience high rates of water loss and that have minimal amounts ofhistorical information available. Includes tables, figures.

Product Details

Edition: Vol. - No. Published: 01/01/1999 Number of Pages: 11File Size: 1 file , 170 KB