Data and Mapping Tools for NPDES Permittees
- Search for NPDES Permitted Facilities
- Tools to Enhance the NPDES Program
- Data and Mapping Tools
National Oceanic and Atmospheric Administration (NOAA) Atlas
NOAA Atlas provides precipitation frequency estimates and associated information. NOAA Atlas 15, currently being updated, will be the first iteration that will develop precipitation frequency estimates for the entire United States and its territories and update the NOAA Atlas 14 precipitation frequency standard while accounting for changing conditions.
FEMA's Flood Mapping Tools
Various flood mapping tools use observed data to help communities better understand their level and type of flood risk through geographic information system (GIS) data layers. Examples include the National Flood Hazard Layer and the National Risk Index.
Locating and Selecting Scenarios Online (LASSO)
Developed by EPA, Locating and Selecting Scenarios Online (LASSO) helps users to get information on annual precipitation, temperature, etc.
National Water Information System
National Water Information System is a publicly available portal in which users can access data on current and historical stream levels, stream flow, reservoir and lake levels, surface water quality, and rainfall from USGS.
Sea Level Rise Viewer
Sea Level Rise Viewer is a mapping tool developed by NOAA that visualizes sea level rise and coastal flooding scenarios.
Hydrologic and Water Quality System (HAWQS)
Hydrologic and Water Quality System (HAWQS) is a web-based, interactive water quantity and quality modeling system to simulate the effect of management practices on water quality. HAWQS substantially enhances the usability of Soil and Water Assessment Tool (SWAT), its core modeling engine, to an extensive array of crops, soils, natural vegetation types, land uses, and scenarios for hydrology and the water quality parameters such as sediment, pathogens, nutrients, biological oxygen demand, dissolved oxygen, pesticides, and water temperature. HAWQS has interactive web interfaces and maps; pre-loaded input data; outputs that include tables, charts, and raw output data; a user guide, and online development, execution, and storage of a user's modeling projects.
National Stormwater Calculator
National Stormwater Calculator estimates the annual amount of stormwater runoff from a specific location anywhere in the United States. Estimates are based on local soil conditions, land cover, and historic rainfall records.
Storm Water Management Model (SWMM)
Storm Water Management Model (SWMM) is used for planning, analysis and design related to stormwater runoff, combined and sanitary sewers, and other drainage systems in urban areas.
