Risk-Screening Environmental Indicators (RSEI) Model

RSEI Data Dictionary: Water Microdata

Tables in the RSEI Data Dictionary
Facility	NAICS	Submission	Disaggregated Microdata	Census Crosswalks
EPA Program IDs (Reporters)	Chemical	Release	Aggregated Microdata	Population Data
Offsite	MCL	Elements	Block Group Microdata	Shapefiles
EPA Program IDs (Off-sites)	Media	Category	Water Microdata

This file contains the toxicity-weighted concentrations downstream of TRI discharges by stream segment. All years of data are contained in the file, which is named NHDMicroResults_conc_agg_XXXX, where XXXX is the reporting year of the data freeze.

Water Microdata
Field Number	Name	Description
1	ReleaseNumber	Internal unique identifier for release (links to Release table).
2	Counter	Auto-increment count of COMIDs
3	ComID	"Common Identifier" of a flowline (sub-segment of a reach)- atomic unit of reach data that matches one-to-one to NHDPlus.
4	ReachCode	Code for reach
5	Conc	Concentration of chemical in flowline (mg/L)
6	Sequence	Number defining pathway of release (used to indicate branching).
7	TravelTime	Time(s) for release to go from top of flowline to bottom.
8	TravelLength	Distance (m) for release to go from top of flowline to bottom
9	Paths	Number of branches in stream path
10	FCode	Descriptor from NHDPlus for type of flowline (e.g., pipeline, stream)
11	ResCode	Internal code