What does TMDL mean?
total maximum daily load
A total maximum daily load (TMDL) is a regulatory term in the U.S. Clean Water Act, describing a plan for restoring impaired waters that identifies the maximum amount of a pollutant that a body of water can receive while still meeting water quality standards.
How do I calculate TMDL?
TMDL = ΣWLA + ΣLA + MOS Where WLA is the sum of wasteload allocations (point sources), LA is the sum of load allocations (nonpoint sources and background) and MOS is the margin of safety.
What is a TMDL implementation plan?
A comprehensive TMDL implementation plan outlines management goals, projects, partners, priorities, schedule and finding along with tracking, monitoring and reevaluation processes. TMDL Effectiveness Monitoring Data and Plans. State Approaches and Needs for Measuring, Tracking and Reporting on Water Quality …
What triggers a TMDL?
A TMDL requires that all sources of pollution and all aspects of a watershed’s drainage system be reviewed, not just the pollution coming from discrete conveyances (known as point sources), such as a discharge pipe from a factory or a sewage treatment plant.
What is a TMDL and why and where is it required?
Total Maximum Daily Loads (TMDLs) are action plans to restore clean water. Section 303(d) of the federal Clean Water Act requires that states identify water bodies — bays, rivers, streams, creeks, and coastal areas — that do not meet water quality standards, and the pollutants that impair them.
What is a waste load allocation?
A waste load allocation (WLA) is the portion of a receiving water’s assimilative capacity that is allocated to one of its existing or future point sources of pollution.
How often are TMDLs updated?
States are required to submit their list for EPA approval every two years. For each water on the list, the state identifies the pollutant causing the impairment, when known.
What is TMDL EPA?
A Total Maximum Daily Load (TMDL) is a calculation of the maximum amount of a pollutant that a waterbody can receive and still meet water quality standards.