2 HYDINFRA is Mn/DOT’s Hydraulic Infrastructure Database
3 HYDINFRA’s Purpose:Manage information about storm drainage system components, including:PipesHydraulic StructuresSpecial Hydraulic StructuresPondsStructural Pollution Control Devices (SPCDs)DitchesOutfallsIllicit Discharge
4 MS4 changes to HYDINFRA: Ponds, SPCDs and DitchesOutfalls and Illicit Discharge Inspection
5 Inputs for Mn/DOT’s Illicit Discharge Data Development: AMEC/Bonestroo’s Illicit Discharge Data Form for Mn/DOT Metro’s MS4 PermitCWP’s IDDE Guidance ManualMS4 Permit, Page 9
6 MS4s must develop, implement and enforce a program to detect and eliminate illicit discharges (with bmps and goals):With a storm sewer map that has:Ponds, streams, lakes, wetlands in our systemSPCDs in our systemAll Pipes with 24” diameter at minimum but “all conveyances” is requested.Outfalls – outlets to others’ storm systems (not diffuse flow)Prohibit non-stormwater discharges and enforce.Program to “detect non-stormwater discharges including dumping”Inform employees, business and public of hazards of improper waste disposal and illegal discharge.(Other mostly clean waters sources are not included unless identified as a problem. Residential car washing, street washing and fire-fighting water plus cleaner water sources aren’t included in illicit discharge.)MS4 Permit Requirements for Illicit Discharge, pg 9 of permit
7 Illicit Discharge is a discharge or deposit of polluting materials, liquid or solid, that can be transported to natural waterways.Leo: knowingly or unknowingly. Leo’s example: a person who didn’t know that wash water from multiple cars is a problem.
10 Illicit Discharges to Mn/DOT: Look for:Unexpected pipes coming into the highway storm drain system.Pipes flowing when storm drains shouldn’t be.HYDINFRA can also record deposits of dumped or otherwise deposited polluting materials.
12 If Mn/DOT Inspectors find an Illicit Discharge: Report it to Area Maintenance Supervisor within 24 hours for follow-up.Accidental chemical spills by trucks are not reported as Illicit Discharge, but are logged by Dispatch and forwarded to MPCA Duty Officer and cleaned up by trucking company’s contractor. Mn/DOT Maintenance does emergency containment.
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