Write a daily streamflow data set to a directory. Can fill missing dates or filter data by years or dates before writing using given arguments. List data frame or HYDAT station number to write its entirety. Can write as .xls, .xlsx, or .csv file types. Writing as Excel file type uses the writexl package.

write_flow_data(
data,
dates = Date,
values = Value,
groups = STATION_NUMBER,
station_number,
water_year_start = 1,
start_year,
end_year,
start_date,
end_date,
file_name,
fill_missing = FALSE,
digits
)

## 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. 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. 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. 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. 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. Numeric value indicating the month (1 through 12) of the start of water year for analysis. Default 1. Numeric value of the first year of data to write. Leave blank to use the first year of the source data. Numeric value of the last year of data to write. Leave blank to use the last year of the source data. Date (YYYY-MM-DD) of first date of data to write. Leave blank if all dates required. Date (YYYY-MM-DD) of last date of data to write. Leave blank if all dates required. Character string naming the output file. If none provided, a default file name (with .xlsx) is provided (see "Successfully created" message when using function for file name). Logical value indicating whether to fill dates with missing flow data with NA. Default FALSE. Integer indicating the number of decimal places or significant digits used to round flow values. Use follows that of base::round() digits argument.

## Examples

if (FALSE) {

# Working examples:

# Write data from a data frame
flow_data <- tidyhydat::hy_daily_flows(station_number = "08NM116")
write_flow_data(data = flow_data,
file_name = "Mission_Creek_daily_flows.xlsx")

# Write data directly from HYDAT
write_flow_data(station_number = "08NM116",
file_name = "Mission_Creek_daily_flows.xlsx")

# Write data directly from HYDAT and fill missing dates with NA
write_flow_data(station_number = "08NM116",
file_name = "Mission_Creek_daily_flows.xlsx",
fill_missing = TRUE)

}