rora: Estimate recharge

In USGS-R/DVstats: Functions to manipulate daily-values data

Estimate recharge

Description

Estiamte recharge by the method of hydrograph recession displacement.

Usage

rora(Dates, Flow, Start = NULL, End = NULL, da, recessIndex, minQ = 0.01,
  incAnteRec = 0, STAID = NULL)

Arguments

Dates	the date of the flow, can be ewither character or class "Date."
Flow	the mean daily flow for the corresponding date.
Start	the starting year for the analysis. If NULL, then begin with the first year in Dates.
End	the ending year for the analysis. If NULL, then end with the last year in Dates.
da	the drainage area of the basin.
recessIndex	the recession index, in days per common log cycle. This is typcially estimated using recess.
minQ	the value to use for the minimum value in flow. Any value in Flow less than the value for minQ is set to the value for minQ.
incAnteRec	a value to add to the base antecedent recession time, in days. In general, this should always be 0.
STAID	a character string to be used as the station identifier. This is used only for documentation when printing or plotting.

Value

An object of class rora, which has these components.
iyr, the year of the observed streamflow.
imon, the month of the observed streamflow.
idy, the day of the observed streamflow.
flow, the observed streamflow.
Nobs, the number of observed values of streamflow.
iyearst, the starting year of the recharge analysis.
iyearen, the ending year of the recharge analysis.
minQ, the value of minQ.
idiff, the value of incAnteRec.
k, the value of recessIndex.
te, the time to end day of the recession following a peak in streamflow, in days.
ta, the time at the critical time after the previous peak.
qp, the streamflow of the peak.
qa, the streamflow the critical time after the previous peak.
qb, the streamflow at the critical time that would have occurred in the absence of the current and any subsequent peaks.
qc, the streamflow at the critical time that would have occurred in the absence of any subsequent peaks.
c, the average value for the current peak calculated from the difference between the flow during recession and flow computed from the recession index for each day between the peak and the critical time.
delq, the difference in flow between the hypothetical flow at the critical time after the current peak and the hypothetical flow at the critical time after the previous peak.
rech, the estimated recharge for the peak, in inches.
year, the year of the peak.
mon, the month of the peak.
day, the day of the peak.
npeaks, the number of peaks.
itbase, the antecedent flow base time, in days. This is the minimum time from a peak to when the flow can be considered to be ground-water discharge.
ierr, the error code.
STAID, the station identifier.

USGS-R/DVstats documentation built on Oct. 11, 2022, 6:03 a.m.