Peak flow data from USGS (NWIS)
Reads peak flow from NWISweb. Data is retrieved from http://waterdata.usgs.gov/nwis. In some cases, the specific date of the peak data is not know. This function will default to converting the complete dates, dropping rows with incomplete dates. If those incomplete dates are needed, set the 'asDateTime' argument to FALSE. No rows will be removed, and no dates will be converted to R Date objects.
character USGS site number(or multiple sites). This is usually an 8 digit number.
character starting date for data retrieval in the form YYYY-MM-DD. Default is "" which indicates retrieval for the earliest possible record.
character ending date for data retrieval in the form YYYY-MM-DD. Default is "" which indicates retrieval for the latest possible record.
logical default to
logical, defaults to
A data frame with the following columns:
|agency_cd||character||The NWIS code for the agency reporting the data|
|site_no||character||The USGS site number|
|peak_dt||Date||Date of peak streamflow|
|peak_tm||character||Time of peak streamflow as character|
|peak_va||numeric||Annual peak streamflow value in cfs|
|peak_cd||character|| Peak Discharge-Qualification codes (see
|gage_ht||numeric||Gage height for the associated peak streamflow in feet|
|gage_ht_cd||character||Gage height qualification codes|
|year_last_pk||numeric||Peak streamflow reported is the highest since this year|
|ag_dt||Date||Date of maximum gage-height for water year (if not concurrent with peak)|
|ag_tm||character||Time of maximum gage-height for water year (if not concurrent with peak)|
|ag_gage_ht||numeric||maximum Gage height for water year in feet (if not concurrent with peak)|
|ag_gage_ht_cd||character||maximum Gage height code|
There are also several useful attributes attached to the data frame:
|url||character||The url used to generate the data|
|queryTime||POSIXct||The time the data was returned|
|comment||character||Header comments from the RDB file|
|siteInfo||data.frame||A data frame containing information on the requested sites|
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