nes: National Eutrophication Survey Data
Description Usage Format Details Examples
Description
A dataset containing hydrologic and water quality data for approximately 800 lakes in the continental United States.
Usage
1 |
Format
An object of class data.frame with 775 rows and 39 columns.
Details
| 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 |
| long | longitude | decimal degrees |
Examples
1 2 | |
