HomeMy Public PortalAboutE2 PROGRAM SUMMARY GlossaryGLOSSARY
BIORETENTION A concave landscape feature which stores, filters, and infiltrates
stormwater runoff.
BIOSTABILIZATION A method of repairing eroding streams by utilizing the structural properties of live plants to rebuild eroded streambanks and incised channels.
BIOSWALE A sloped open drainage channel with landscape elements designed to
store, filter, and infiltrate stormwater runoff.
CD The Federal Consent Decree, entered on April 27, 2012 and all appendices and all modifications or amendments thereto, between MSD, United States of America, and the Missouri Coalition for the
Environment Foundation designed to eliminate or reduce overflows from the Combined and Separate Sewer Systems in order to improve water quality and protect human health and the environment.
CIPP Cured in Place Pipe, a construction method to rehabilitate a sewer pipe by lining it with a new pipe. This work does not require excavating the pipe
and replacing it in total.
CIRP Capital Improvement and Replacement Program, the ongoing system
improvement efforts by MSD.
CMOM Capacity, Management, Operations, and Maintenance program.
COE United States Army Corps of Engineers.
COMBINED SEWER The portion of MSD's sewer system designed to convey municipal sewage (i.e. domestic, commercial and industrial wastewaters) and
stormwater runoff through a single-pipe system to a wastewater treatment facility and/or to a CSO outfall.
CONSENT DECREE See “CD”.
CSO Combined Sewer Overflow, any discharge from the combined sewer system at a point prior to the headworks of a wastewater treatment
facility.
GI Green Infrastructure, environmentally friendly and sustainable stormwater management practices that reduce runoff by using infiltration,
such as bioretention and bioswales.
I/I Inflow and Infiltration; inflow refers to direct connections of rainwater
sources to the sanitary sewer system; infiltration refers to groundwater sources of flows into sewer pipes. Inflow sources can include roof
downspouts, yard and area drains, foundation drains, manhole covers, cross connections from storm sewers, or inlets. Infiltration sources can include defective building laterals, sewer pipes, pipe joints, connections,
or manhole walls. INFILTRATION Infiltration refers to groundwater sources of flows into sewer pipes.
Infiltration sources can include defective building laterals, sewer pipes, pipe joints, connections, or manhole walls.
INFLOW Inflow refers to direct connections of rainwater sources to the sanitary sewer system. Inflow sources can include roof downspouts, yard and area
drains, foundation drains, manhole covers, cross connections from storm
sewers, or inlets.
GLOSSARY
LATERAL A sewer connecting a building with the publicly owned sanitary sewer
main.
LMRDP Lower and Middle River Des Peres, generally the river from University City south to the Mississippi River.
LTCP Long Term Control Plan, a long duration plan to manage/improve the combined sewer system and abate combined sewer overflows, through
the identification of a capital improvement plan tailored to receiving
stream water quality and the community's financial capability.
MAIN A smaller public sewer collecting flows from buildings via lateral
connections.
MGD Million Gallons per Day, a measure of flow over time. 1 MGD is
equivalent to 700 gallons per minute of flow.
MSD Metropolitan St. Louis Sewer District, district formed in 1954 via vote of the people, with responsibility for wastewater and stormwater services in St. Louis City and most of St. Louis County.
OMCI Operation Maintenance Construction Improvement district, funds
generated by tax payments in certain districts can be used for capital improvements in those districts. Funds can be used for capital projects or
maintenance.
OUTFALL The point of discharge to the environment from a constructed SSO or CSO.
PRIVATE I/I REDUCTION Reduction of inflow and infiltration sources on private property, from private sources, such as downspout and driveway drain connections to the
sanitary sewer system (inflow) or deteriorated service laterals or broken connections (infiltration).
PUBLIC I/I
REDUCTION
Reduction of public inflow and infiltration sources such as cracked and
broken sewer pipes or deteriorated manholes.
RAINSCAPING Any combination of plantings, water features, catch basins, permeable pavement and other activities that manage stormwater as close as possible to where it falls, rather than moving it someplace else.
RDP River Des Peres, a river in the central and south portions of the metropolitan area, which was enlarged in the early 1900s to provide
conveyance to the Mississippi River of stormwater runoff in order to reduce surface flooding.
RFP Request for Proposals.
RFQ Request for Qualifications.
SANITARY SEWER SYSTEM The portion of the sewer system designed to convey only sewage, and not stormwater, from residences, commercial buildings, industrial plants and institutions for treatment at a wastewater treatment facility.
SKME Sverdrup Kwame Metcalf Eddy - a planning team that identified system
needs in the early 2000’s.
GLOSSARY
SSO Sanitary Sewer Overflow, any overflow, spill, diversion, or release of
wastewater from or caused by MSD's sanitary sewer system. This CD term shall include: (i) discharges to surface waters of the State or United
States from MSD's sanitary sewer system and (ii) any release of
wastewater from MSD's sanitary sewer system to public or private property that does not reach waters of the State or United States.
SSO MP Sanitary Sewer Overflow Control Master Plan, a capital improvement plan which describes the results of system evaluations and the specific
measures that will result in the elimination of all constructed SSOs
Outfalls, all known SSOs, and Building Backups, and/or that are necessary to ensure that there is adequate capacity in the Sanitary Sewer
System to collect, convey, and treat anticipated peak wet weather flows
under current and projected future conditions as defined in Paragraphs 21(e) and (g) of the CD.
SUBTRUNK A sewer that serves a smaller or sub-watershed area, which brings flow to
a trunk sewer.
TRUNK SEWER A major sewer which serves a large area. A trunk sewer typically is centrally located within a watershed to which subtrunks and other sewers are tributary.
USGS United States Geological Survey.
WWTF Wastewater Treatment Facility, any facility, method or process which
removes, reduces or renders less obnoxious pollutants or water
contaminants released from any source. WWTP Wastewater Treatment Plant, a municipal facility that removes, reduces
or renders less obnoxious pollutants or water contaminants from
wastewater before releasing it to the environment.