| Summary: | 碩士 === 國立海洋大學 === 河海工程學系碩士在職專班 === 91 === A Review of Design Flow And Field Experiment
of Taipei City Sanitary Sewer System
Abstract
In recent years, Wastewater and river pollution are becoming critical issues in the urban areas in Taiwan. In the year 2002, the central government publicly announced that there will be 655 hundred million NT dollars to be put in use, In order to increase the users，pipes connection rate from 8.7﹪to 20.3﹪. However, due to the lack of field data and coefficients for estimating the planned drainage flow and pipes, We can only refer other countries，data to Taipei city，s construction module, with very few real-life investigations. As a result, the data and coefficients of this system are relatively conservative. Hence, in order to find a more reasonable capacity for drainage sewer system. We choose four districts in Taipei city，s to conduct the field survey.
The accuracy for a bypass sewer plan analysis and flow rate can only be dependent on estimating yearly “population” and “wastewater flow rate per unit” of the district plan. If the estimations of there two data are too high, then we will have over investment on the pipelines and the treatment plants. On the contrary, we will face the problems of pipelines shortage and insufficient sewage carrying capacity. Also the sewer system design in the country is regulated by three difference regulations. Individual regulation is appropriate for simple system design but not for whole system.
To solve the problem mentioned above, the only solution is to conduct a strict and exclusive research to get the real data locally. They provide basis of designing and planning the sewer system in the future. According to the data from Environmental Protection Agency of Executive Yuan, residential wastewater is the major source for the deterioration of Tamshui River. Hence, this paper focuses on the flow rate of residential wastewater. The key points of the present problems are based on the documents published by Taipei city，s urban plan reports、design standards、statistical materials、research reports and government policy announcements. Some parameter（population estimation、population density, etc.）which cannot be obtained by measured data, will be analyzed and compared in different aspects by coordinating all available material.
In order to acquire the quantity of wastewater, the experimental tools and procedures were developed with study. Four different districts with different community scale in Taipei city were selected to perform a seven days continuous measurements in different seasons. Also, we counted the number of household in each community、the quantity of drain facilities inside the buildings and the number of inhabitants in each community. Also, the yearly quantity of tap water used in each household of every community were collected through water company.
The period of the field experiment started from January 2003 until April 2003 at four residential communities of Wanhua、Shilin、Sonshan 、and Neihu in Taipei. Once residential wastewater investigation completed, we use the measured data to calculate the numerical analysis of daily wastewater quantity、seven-days wastewater quantity、and fourteen-days wastewater quantity.
From collected data the correlated numerical values and factors such as: the equalized quantity of wastewater in a period、the maximum quantity of wastewater in a hour、the hourly peak factors、the equalized quantity of wastewater in one day、the maximum quantity of wastewater in one day、the daily peak factors and regarding the range and time zone when the maximum quantity of wastewater in an hour and the equalized quantity of wastewater in one day both happening in a period were obtained and compare with the data currently used in design.
Keywords: sanitary sewer systems、unit wastewater、peak coefficient、residential wastewater.
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