Sentinel Site Criteria
This criteria is suggested by NGRREC/GLTG. It will be updated with revision and suggestions from partners.
- Parameters of interest (do not all have to occur at a single site)
- Nitrate
- TN
- Total Phosphorus
- Dissolved Phosphorus
- Turbidity
- Sediment (If viable. Likely few sites available)
- Site Criteria
- Data / Measurements
- Longest record available. Data going back to 1980-1996 or close to it,
time series may be shortened slightly if list of sites too narrow. - At least monthly sampling, more frequent is better Monthly sampling first
- Discreet and Continuous sensor data should not be mixed unless an analysis is done to determine if data is comparable
- Gaps in data should be fairly short in duration
- Event data, if available, can be used, though is not necessary*
- If methods vary between sites, can still compare as long as an approved method used, and parameter reported is the same
- When using WRTDS, flux bias statistic should be in range of -0.1 to 0.1. Other model checks should be used as well
- Flow measurements(discharge) should be available either at the site, or close by on the waterway, to be used to calculate loads
- Data gaps should be relatively short, no more than one to two years- use as screening criteria to select sites with shortest data gaps
Baseline 1980-1996?
- Longest record available. Data going back to 1980-1996 or close to it,
- Geographic
- Between approx 1000 sq mi to 20,000 sq mi (no smaller than HUC 8, approximately size of HUC 6)
- HUCs not necessarily the size of the watershed.
- Drainage for site should be specifically calculated and mapped
- Watershed land use should be approximately representative of the state’s land use
- Small watersheds (HUC 12 size) are more relevant to a particular project, not necessarily state-level progress
- Sites experiencing backwater flow should generally be avoided
- Between approx 1000 sq mi to 20,000 sq mi (no smaller than HUC 8, approximately size of HUC 6)
- Data / Measurements
- Methods
- Loads
- Flow-Normalized Loads & Trends
WRTDSIf interested only in NPS, then remove point source discharges
* Event data may not bias WRTDS, but make the trends calculated using the method less reliable. (need citation)
Selected Sentinel Sites
Each sentinel site will have a separate page. This section will summarize the sites.
Requirements | Sites | Notes |
---|---|---|
detail | ||
Site 1 | ||
Site 2 |