Level of Modeling

HUC

Examples of Infrastructure of Concern

TMDL Region/USGS Watershed

8 digit

Major canals, dams, large rivers, lakes, and ocean

Subwaterhed

12 digit

Primary and secondary canals, dams, large rivers, lakes, ocean, streams, smaller lakes, large bridge/culvert structures, draiange operations/staging

Community

n/a

Rivers/streams/canals, interceptors/large ditchs, neighborhood lakes/large retention/detention areas, major roadway conveyances

Neighborhood

n/a

Catch basins, swales, 15" piping, crowns of road, culverts under driveways, local retention/detentaion areas