Adds rows of dates with missing flow values to a streamflow data set with daily flow values of NA. Missing dates will be filled in gaps between data and completely fill the first and last years.

fill_missing_dates(
  data,
  dates = Date,
  values = Value,
  groups = STATION_NUMBER,
  station_number,
  water_year_start = 1,
  fill_end_years = TRUE
)

Arguments

data

Data frame of daily data that contains columns of dates, flow values, and (optional) groups (e.g. station numbers). Leave blank if using station_number argument.

dates

Name of column in data that contains dates formatted YYYY-MM-DD. Only required if dates column name is not 'Date' (default). Leave blank if using station_number argument.

values

Name of column in data that contains numeric flow values, in units of cubic metres per second. Only required if values column name is not 'Value' (default). Leave blank if using station_number argument.

groups

Name of column in data that contains unique identifiers for different data sets, if applicable. Only required if groups column name is not 'STATION_NUMBER'. Function will automatically group by a column named 'STATION_NUMBER' if present. Remove the 'STATION_NUMBER' column beforehand to remove this grouping. Leave blank if using station_number argument.

station_number

Character string vector of seven digit Water Survey of Canada station numbers (e.g. "08NM116") of which to extract daily streamflow data from a HYDAT database. Requires tidyhydat package and a HYDAT database. Leave blank if using data argument.

water_year_start

Numeric value indicating the month (1 through 12) of the start of water year for analysis. Default 1.

fill_end_years

Logical value indicating whether to fill incomplete start and end years with rows of dates with NA flow values. If FALSE then only missing dates between the provided start and end dates will be filled. Default TRUE.

Value

A tibble data frame of the source data with additional rows of filled values of missing dates.

Examples

# Run if HYDAT database has been downloaded (using tidyhydat::download_hydat()) if (file.exists(tidyhydat::hy_downloaded_db())) { # Fill missing dates with NA using calendar years fill_missing_dates(station_number = "08NM116") # Fill missing dates with NA using water years starting in August fill_missing_dates(station_number = "08NM116", water_year_start = 8) }
#> # A tibble: 25,567 x 5 #> STATION_NUMBER Date Parameter Value Symbol #> <chr> <date> <chr> <dbl> <chr> #> 1 08NM116 1948-08-01 Flow NA NA #> 2 08NM116 1948-08-02 Flow NA NA #> 3 08NM116 1948-08-03 Flow NA NA #> 4 08NM116 1948-08-04 Flow NA NA #> 5 08NM116 1948-08-05 Flow NA NA #> 6 08NM116 1948-08-06 Flow NA NA #> 7 08NM116 1948-08-07 Flow NA NA #> 8 08NM116 1948-08-08 Flow NA NA #> 9 08NM116 1948-08-09 Flow NA NA #> 10 08NM116 1948-08-10 Flow NA NA #> # ... with 25,557 more rows