A dataset containing hydrologic and water quality data for approximately 800 lakes in the continental United States.
nesAn object of class data.frame with 775 rows and 39 columns.
| variable name | description | units |
| pdf identifier (474 - 477) | integer | |
| pagenum | page number of the pdf (not the report page number) | 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 of time in 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 | variable name |
# NOT RUN {
data(nes)
head(nes)
# }
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