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Item Information   Holdings       More by this author     Stewart, Kristen J.     Subjects     Combined sewer overflows     Sewerage     Environmental protection -- Cost effectiveness     Stormwater infiltration.     Urban runoff -- Management.     Fluid dynamic measurements     MSEV Project.     Browse Catalog     by author:      Stewart, Kristen J.       by title:      The Caddy Vista Sani...         MARC Display

The Caddy Vista Sanitary District rain-derived infiltration and inflow (RDI/I) reduction demonstration project : Element 1 - Document effectiveness of past RDI/I reduction efforts / Kristen J. Stewart. by Stewart, Kristen J. Subjects Combined sewer overflows   Sewerage   Environmental protection -- Cost effectiveness   Stormwater infiltration.   Urban runoff -- Management.   Fluid dynamic measurements   MSEV Project. Description:  77 leaves : ill. ; 29 cm. Contents:  Advisor: Dr. Francis Mahuta Committee members: Paul Boersma, Dr. William Gonwa Introduction - Literature search - Methods identification and selection - Method development - RDI/I reduction results - Cost-effectiveness evaluation - Conclusions and recommendations - References - Appendix A) CVSD project history-public and private sanitary sewer rehabilitation. In 2000, the Milwaukee Metropolitan Sewerage District (MMSD) chose the Caddy Vista Sanitary District (CVSD) and seven other municipalities to receive funds for demonstration projects aimed at reducing rain-derived infiltration and inflow (RDI/I) in the sanitary sewer system. The CVSD project goals for Element 1 were to demonstrate the effectiveness of past sanitary sewer rehab projects in terms of annual maximum daily and annual average daily RDI/I reductions, and also to evaluate the cost-effectiveness of those rehab projects. Past sewer rehab projects included the work completed from 1995 to 1997, based on the 1994 Limited Sanitary Sewer Evaluation Survey (LSSES) recommendations. These projects included private sanitary lateral and public sewer main relay, and manhole and manhole cover replacements. To measure project effectiveness in terms of annual maximum daily RDI/I reductions, a pre- and post-rehab rainfall/RDI/I regression model was developed. When the models were compared to each other, approximately a fifty-percent reduction in annual maximum daily RDI/I was observed. Annual RDI/I volumes were reduced by 34 percent. This means two things: 1) Upgrades to the main line sewer and the lift station will not likely be required for annual maximum daily RDI/I. 2) Available capacity can be used for future growth of the CVSD. Cost-effectiveness was based on comparing the initial investment of the sewer rehab projects to the benefits of RDI/I reduction. Results showed that peak-day RDI/I reductions warranted the sewer rehab costs during periods of 15-year rain events, or greater. While this may not seem significant, it is considering that the larger or less frequent rain events cause the most problems and damage. Future rehab projects will concentrate more on reducing average daily RDI/I, as well as the peak-day RDI/I for more frequent (or less than 15-year) rainfall return periods, and will be evaluated in terms of public versus private sources. In addition to these cost savings, the CVSD has already realized a 34 percent savings on annual operation and maintenance (O&M) costs associated with transporting and pumping RDI/I.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .S749 2002 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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