Sanitation District No. 1 (SD1) manages sanitary and stormwater systems for the majority of Kenton County as shown in Figure 1. SD1 services 191 square miles, covering over 30 municipalities and unincorporated portions of Boone, Campbell, and Kenton counties. The agency has approximately 196,000 total customers and maintains 123 wastewater pumping stations, 15 flood pump stations and three major wastewater treatment plants. There are approximately 440 miles of storm sewer and over 1,650 miles of sanitary sewer lines within SD1’s jurisdiction. Wastewater is conveyed to three treatment plants in Northern Kentucky. Combined, SD1 major plants treat an average of 35.5 million gallons of wastewater per day from more than 94,000 sanitary customers.
Figure 1: SD1 Service Area (Click on the map to view a larger image) 1
One of the most significant challenges facing SD1 and Kenton County is the reduction of stormwater overflow events. Overflows occur during wet weather when stormwater enters the system and exceeds the engineered capacity for rainwater. Excess rainfall overloads the system and combines with wastewater to form a mixture which can contain harmful bacteria. During particularly heavy rain events, stormwater is discharged into natural waterways at outfalls, entering into the region’s natural environment through creeks and rivers, and is harmful to humans and the ecosystem. SD1 has 97 outfalls within its coverage area. SD1’s Clean H2O40 program is an agreement between SD1, the US Environmental Protection Agency and the Kentucky Energy and Environment Cabinet, to address combined sewer overflows (CSO’s) and sanitary sewer overflows (SSO’s). Under Clean H2O40, SD1 has target overflow reduction metrics every five years through a final deadline on January 1, 2040.
Clean H2O40 projects will improve reliability of the sewer system, eliminate a number of overflow locations and improve water quality. By the year 2040 SD1 will completely eliminate sanitary sewer overflows in a typical year; and recapture at least 85 percent of the typical-year combined system flow.
To attain these goals, SD1 is going to build a system that works smarter, not harder. Equalization tanks, detention basins and other structures are being built to strategically store flow during heavy rains and then control how and when that flow is reintroduced into our system.
This controlled storage approach, combined with targeted upsizing of pipes, is the most cost-effective strategy to meet the requirements of the Clean H2O40.
SD1’s progress will be measured at critical 5-year milestones to ensure the utility is on pace to reach its Clean H2O40 goals. Those milestone dates are:
July 1, 2023: At least 67 percent recapture of typical-year combined system flow and elimination of at least 20 percent of baseline typical-year SSOs
January 1, 2029: At least 75 percent recapture of typical-year combined system flow and elimination of at least 75 percent of baseline typical-year SSOs
July 1, 2034: At least 80 percent recapture of typical-year combined system flow and elimination of at least 90 percent of baseline typical-year SSOs
January 1, 2040: At least 85 percent recapture of typical-year combined system flow and elimination of 100 percent of baseline typical-year SSO