PC Packet 12.21.17 - Laserfiche WebLink

Home

Inflow and Infiltration (1/1) Inflow is water, typically stormwater, which enters the sewer system through broken manhole covers, sewer cleanouts, sump pumps, foundation drains, and rain leaders. Infiltration is water, typically groundwater, which leaks into the sewer system through cracks in the sewer mains, laterals, joints, and manholes. Water from inflow and infiltration (1/1) can consume available capacity in the wastewater collection system and increase the flow into treatment facilities. In extreme cases, the added flow can cause bypasses or overflows of raw wastewater. This extra flow also requires a larger capacity in the city's collection and treatment components, which results in increased capital, operation and maintenance, and replacement costs. As a sewer system ages and deteriorates, 1/1 can become an increasing burden on a City's system. Therefore, it is imperative that I/1 be reduced whenever it is cost effective to do so. The MCES has established 1/1 goals for each community discharging wastewater into the Metropolitan Disposal System (MDS) based on average day flows and allowable peaking factors. In February 2006, the MCES began an 1/1 Surcharge Program which requires communities within their service area to eliminate excessive 1/1 over a period of time. Now, communities that exceed their wastewater flow program year goals for the period of January 1, 2017 through December 31, 2017 will be required to complete an 1/1 mitigation assignment to be implemented in 2019. Historically, the City of Hugo has not been identified by the MCES as having excessive 1/1. During the development of the 1/1 Surcharge Program, the City was not charged for wastewater generation based on actual metering data, but rather on estimated wastewater flows based on connections added per year. MCES began billing the City of Hugo based on metering data in 2013, using data available beginning in 2011. An analysis of recent metering data as it relates to 1/1 is included below. 1-1UG0 2040 COMPREHENSIVE PLAN UPDATE DRAFT Dec 14-17 COMPREHENSIVE SANITARY A SEWER PLAN for review only