MSD is committed to reducing or eliminating recurring Sanitary Sewer Overflows (SSOs) throughout its service area in Jefferson County and conforming with Kentucky Division of Water (KDOW) requirements set forth in KAR 5.005.  As part of this commitment, MSD established the Inflow and Infiltration (I&I) Program. This program allows MSD to focus efforts on long-term, system-wide I&I reductions which will result in SSO mitigation through flow monitoring, field investigation, and infrastructure rehabilitation. Priorities for the program are as follows:

• Eliminating basement flooding caused by sewer backup as a result of excessive I&I;
• Eliminating and/or reducing the frequency/volume of recurring SSOs caused by excessive I&I;
• Reducing MSD expenditures to construct, maintain, and operate sewage collection and treatment systems impacted by existing I&I flows; and
• Assuring compliance with KDOW regulations governing sewer line extensions and West County Wastewater Treatment Plant upgrades.

The result has been the creation of a 15-year master plan that is organized by sewershed. This plan includes a deliberate process of: flow monitoring; investigation of priority areas identified through flow monitoring; Sanitary Sewer Evaluation Studies (SSES); rehabilitation of critical areas optimized by hydraulic modeling as required; and post-rehabilitation flow monitoring to document success. MSD has a wide variety of resources to implement this plan through the I&I Program. These resources include a full-time staff dedicated to wet-weather sanitary sewer problems and a consultant team, both of which have personnel and resources for planning, field investigation, field repair, flow monitoring and analysis of all field data. Resources also include: a complete GIS database of MSD's sanitary sewer system, which includes all infrastructure data; the Infrastructure Management System (IMS) database; and a number of state of the art applications that combine data from a variety of sources for each known or suspected SSO. The current Fiscal Year 1999 I&I Program has a total budget of $7.1 million dedicated to using the resources mentioned above to meet MSD's program goals.

MSD submits to the KDOW on an annual basis the Sanitary Sewer Overflow Abatement and Elimination Plan (SSOAEP). MSD submitted our latest version in November of 1998 and it is currently under review. The purpose of this report is to associate the 50 past, current and budgeted I&I projects with the 32 known and 18 potential SSOs. This report illustrates this association and details the progress toward reducing and eliminating SSOs in the MSD collection system.

Included in the report are:

• The location, overflow frequency and annual volume of each SSO; a list of suspected SSOs being investigated; and a list of projects to determine the sources of I&I;
• A list of rehabilitation projects to reduce I&I;
• The interrelation between watersheds, SSOs and I&I Projects;  and
• Outline of the I&I General Services Program to administer the program, identify new projects and administer new initiatives to keep abreast of new technologies.

The following table lists important facts about the Program outlined in this report:

Sanitary Sewer Overflows continued

For more information, please contact:  Angela Akridge