Plot annual nday minimum values, and the day of year and date of occurrence of daily flow values from a daily
streamflow data set. Calculates statistics from all values, unless specified. Data calculated from calc_annual_lowflows()
function. Returns a list of plots.
plot_annual_lowflows( data, dates = Date, values = Value, groups = STATION_NUMBER, station_number, roll_days = c(1, 3, 7, 30), roll_align = "right", water_year_start = 1, start_year, end_year, exclude_years, months = 1:12, ignore_missing = FALSE, log_discharge = FALSE, include_title = FALSE )
data  Data frame of daily data that contains columns of dates, flow values, and (optional) groups (e.g. station numbers).
Leave blank if using 

dates  Name of column in 
values  Name of column in 
groups  Name of column in 
station_number  Character string vector of seven digit Water Survey of Canada station numbers (e.g. 
roll_days  Numeric value of the number of days to apply a rolling mean. Default 
roll_align  Character string identifying the direction of the rolling mean from the specified date, either by the first
( 
water_year_start  Numeric value indicating the month ( 
start_year  Numeric value of the first year to consider for analysis. Leave blank to use the first year of the source data. 
end_year  Numeric value of the last year to consider for analysis. Leave blank to use the last year of the source data. 
exclude_years  Numeric vector of years to exclude from analysis. Leave blank to include all years. 
months  Numeric vector of months to include in analysis (e.g. 
ignore_missing  Logical value indicating whether dates with missing values should be included in the calculation. If

log_discharge  Logical value to indicate plotting the discharge axis (Yaxis) on a logarithmic scale. Default 
include_title  Logical value to indicate adding the group/station number to the plot, if provided. Default 
A list of ggplot2 objects with the following for each station provided:
ggplot2 object of annual minimums of selected nday rolling means
ggplot2 object of the day of years of annual minimums of selected nday rolling means
# Run if HYDAT database has been downloaded (using tidyhydat::download_hydat()) if (file.exists(tidyhydat::hy_downloaded_db())) { # Plot annual 1, 3, 7, and 30day (default) low flow statistics with default alignment plot_annual_lowflows(station_number = "08NM116") # Plot annual custom 3 and 7day low flow statistics with "center" alignment plot_annual_lowflows(station_number = "08NM116", roll_days = c(3,7), roll_align = "center") }#> Warning: One or more calculations included missing values and NA's were produced. Filter data for complete years or months, or use to ignore_missing = TRUE to ignore missing values.#> Warning: One or more calculations included missing values and NA's were produced. Filter data for complete years or months, or use to ignore_missing = TRUE to ignore missing values.#> $Annual_Low_Flows#> #> $Annual_Low_Flows_Dates#>