Calculates the timing (day of year and date) of portions of total annual flow of daily flow values from a daily streamflow data set. Calculates statistics from all values from complete years, unless specified. Returns a tibble with statistics.

calc_annual_flow_timing( data, dates = Date, values = Value, groups = STATION_NUMBER, station_number, percent_total = c(25, 33.3, 50, 75), water_year_start = 1, start_year, end_year, exclude_years, transpose = 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. |

percent_total | Numeric vector of percents of total annual flows to determine dates. Default |

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. |

transpose | Logical value indicating whether to transpose rows and columns of results. Default |

A tibble data frame with the following columns:

calendar or water year selected

day of year for each n-percent of total volumetric discharge

date (YYYY-MM-DD) for each n-percent of total volumetric discharge

day of year of 25-percent of total volumetric discharge

date (YYYY-MM-DD) of 25-percent of total volumetric discharge

day of year of 33.3-percent of total volumetric discharge

date (YYYY-MM-DD) of 33.3-percent of total volumetric discharge

day of year of 50-percent of total volumetric discharge

date (YYYY-MM-DD) of 50-percent of total volumetric discharge

day of year of 75-percent of total volumetric discharge

date (YYYY-MM-DD) of 75-percent of total volumetric discharge

Barnett, T.P., Pierce, D.W., Hidalgo, H.G., Bonfils, C., Santer, B.D., Das, T., Bala, G., Wood, A.W., Nozawa, T., Mirin, A.A., Cayan, D.R., Dettinger, M.D., 2008. Human-Induced Clanges in the Hydrology of the Western United States. Science 319, 1080-1083.

# Run if HYDAT database has been downloaded (using tidyhydat::download_hydat()) if (file.exists(tidyhydat::hy_downloaded_db())) { # Calculate annual flow timings with default percent of annual totals calc_annual_flow_timing(station_number = "08NM116") # Calculate annual flow timings with custom percent of annual totals calc_annual_flow_timing(station_number = "08NM116", percent_total = 50) }#> 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.#> # A tibble: 69 x 4 #> STATION_NUMBER Year DoY_50pct_TotalQ Date_50pct_TotalQ #> <chr> <dbl> <dbl> <date> #> 1 08NM116 1949 NA NA #> 2 08NM116 1950 NA NA #> 3 08NM116 1951 NA NA #> 4 08NM116 1952 NA NA #> 5 08NM116 1953 NA NA #> 6 08NM116 1954 NA NA #> 7 08NM116 1955 NA NA #> 8 08NM116 1956 NA NA #> 9 08NM116 1957 NA NA #> 10 08NM116 1958 NA NA #> # ... with 59 more rows