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ReproducibleQM / NES

The National Eutrophication Survey: lake characteristics and historical nutrient concentrations
https://doi.org/10.5063/F1CZ35HF
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National Eutrophication Survey

DOI

This respository contains a digitally transcribed copy (nes_data.csv) of the National Eutrophication Survey (NES) dataset. The original data can be found in the archival_pdfs folder or by searching: https://www.epa.gov/nscep

Locations

Data

variable name description units
pdf pdf identifier (474 - 477) integer
pagenum page number of the pdf integer
storet_code identifier which links measurement to coordinate locations character
state state where the water body resides character
name name of the water body character
county county where the water body resides character
lake_type natural or impoundment character
drainage_area the total drainage area square kilometers
surface_area the area of the water surface sq km
mean_depth the volume of the water body divided by the surface area in square meters meters
total_inflow the mean of the inflows of all tributaries and the immediate drainage cubic meters per second
retention_time a mean value determined by dividing the lake volume, in cubic meters, by the mean annual outflow in cubic meters per unit cof time years or days
retention_time_units the units of time for each retention entry years or days
alkalinity alkalinity milligrams per liter
conductivity conductivity microohms
secchi secchi meters
tp total phosphorus milligrams per liter
po4 orthophosphate milligrams per liter
tin total inorganic nitrogen milligrams per liter
tn total nitrogen milligrams per liter
p_pnt_source_muni municipal point source phosphorus loading kilograms per year
p_pnt_source_industrial industrial point source phosphorus loading kilograms per year
p_pnt_source_septic septic point source phosphorus loading kilograms per year
p_nonpnt_source nonpoint source phosphorus loading kilograms per year
p_total total phosphorus loading kilograms per year
n_pnt_source_muni municipal point source nitrogen loading kilograms per year
n_pnt_source_industrial industrial point source nitrogen loading kilograms per year
n_pnt_source_septic septic point source nitrogen loading kilograms per year
n_nonpnt_source nonpoint source nitrogen loading kilograms per year
n_total total nitrogen loading kilograms per year
p_total_out total phosphorus outlet load kilograms per year
p_percent_retention percent phosphorus retention percent
p_surface_area_loading phosphorus surface area loading grams per square meter per year
n_total_out total nitrogen outlet load kilograms per year
n_percent_retention percent nitrogen retention percent
n_surface_area_loading nitrogen surface area loading grams per square meter per year
lat latitude decimal degrees
long longitude decimal degrees

Workflow

  1. Use the nesR package to generate the files in /02_raw_data.

  2. Hand check the files in /02_raw_data/merged_data against the pdfs in /01_archival_pdfs.

  3. Combine files with 05_analysis_scripts/PDF_Merge.R.

Contributing

We’ve combed the data to try and find all the transciption errors but it’s difficult to catch them all. If you find any errors please open an issue or submit a pull request against the files in /03_qa_data.

References

Stachelek, J., Ford, C., Kincaid, D., King, K., Miller, H. and Nagelkirk, R., 2018. The National Eutrophication Survey: lake characteristics and historical nutrient concentrations. Earth System Science Data, 10(1), pp.81-86. (https://doi.org/10.5194/essd-10-81-2018)

Stachelek, J. (2017). nesR: Scrape Data from National Eutrophication Survey archival PDFs. R package version 0.1. (https://github.com/jsta/nesR) (https://dx.doi.org/10.5281/zenodo.400258)

Stachelek, J. (2017). nesRdata: National Eutrophication Survey Data Package. R package version 0.1. https://github.com/jsta/nesRdata