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原文传递 Removal Effectiveness of Co-mingling Off-site Flows with FDOT Right-of-way Stormwater

题名：	Removal Effectiveness of Co-mingling Off-site Flows with FDOT Right-of-way Stormwater
作者：	Wanielista, M.; Chang, N.; Hardin, M.; Gogo-Abite, I.
关键词：	Highway runoff##Computer models##Effectiveness##Mass removal##Cost##Design##Spreadsheet##Best management practices##
摘要：	The Florida Department of Transportation (FDOT) manages runoff with best management practices (BMPs) in their right-of-way (onsite) to meet regulatory requirements for removal of nitrogen and phosphorus. In some situations, runoff water from outside the right-of-way (offsite) may be present. FDOT has an option to treat offsite runoff in an onsite facility or to bypass the onsite facility. The decision to bypass frequently is based on the cost of bypass vs. the cost of treating in an onsite BMP plus the mass removal obtained by mixing the onsite with offsite waters (comingling). Before this report was completed, there were no evaluation methods. Within this report is the development of the methodologies for estimating the removal effectiveness of comingling as well as the incorporation of the methods into the BMPTRAINS model for evaluating the mass removal and cost of the options. To determine capture volumes when comingling, simulations for runoff volume were completed for five rainfall locations within the state of Florida. Seventy-five (75) runoff simulations for each of the five sites use a combination of values for three probable causative parameters, namely runoff volume, delay of offsite runoff to reach an onsite BMP, and treatment size of the onsite BMP. It was shown that the three causative factors have a direct impact on the removal effectiveness. The three causative factors were incorporated in the BMPTRAINS calculation routines. Example problems illustrate the use of the BMPTRAINS model considering onsite as well as of offsite runoff. To aid in the decision to bypass or not to bypass an onsite BMP, cost analysis was added to the BMPTRAINS model. One of the example problems demonstrates the calculation of cost. The BMPTRAINS model was also improved with the addition of a routine to incorporated mixed soil and cover conditions within a catchment. The program is acceptable for use by all the water management districts and the Department of Environmental Protection within the state of Florida.
总页数：	239
报告类型：	科技报告