calculate_durations: Calculate durations

In WDNR-Water-Use/CSLSscenarios: CSLS MODFLOW Scenario Analysis

Description

Given a data frame with a "lake", "date", and "level" columns as well as a vector of desired exceedance probabilities, calculates consecutive months at/above (for probabilities <= 50%) or at/below (for probabilities >= 50%) the exceedance levels.

Usage

calculate_durations(
  df,
  probs = c(10, 25, 50, 75, 90),
  departures = FALSE,
  exceeds = NULL
)

Arguments

df	a data frame with a "lake" and a "level" column
probs	a vector with all exceedance probabilities to calculate. Defaults to c(10, 25, 75, 90).
departures	logical defaults to FALSE. If TRUE, calculates durations 1ft above median and 1ft below median
exceeds	defaults to NULL. If provided, should be a data frame with first column "lake" and subsequent columns corresponding to exceedance probabilities (e.g., "10", "25", "50", "75", "90") and associated lake levels.

Value

durations, a data frame with the following columns:

lake	name of lake
variable	exceedance probability, e.g., "10", "25", "75", "90", "a50" (for above 50%), "b50" (for below 50%)
value	one count of number of months levels were consecutively above or below the given exceedance probability

WDNR-Water-Use/CSLSscenarios documentation built on Nov. 10, 2021, 4:14 p.m.