Hydrologic Data Format

Long Valley Caldera Hydrologic Data

The USGS monitors springs, streams, wells and fumaroles in Long Valley to study the natural hydrologic variations and the response of the hydrologic system to volcanic and tectonic processes. The CD-R makes available hydrologic data collected at key monitoring sites between 1982 and 2002 (click here for a list of the available monitoring sites). Data are provided as ASCII Fixed Width format files (.dat files) and can be read with Excel or a text-only editor (e.g., Wordpad).

Directory and file name structure

Directory	MonitoringData/Hydrologic
Folder	FumaroleData
Folder	SpringData
Folder	StreamData
Folder	WellData

Map projection	Geographic
Datum	NAD27
Units	DD

Each folder (FumaroleData, SpringData, StreamData, WellData) contains data files in which the filename is structured such that the site name is contained in the characters before the underscore symbol ( _ ) and the type of data is contained after the underscore symbol.

Each folder may have subfolders if there is more than one data file associated with that site. For example, under the directory WellData, there is a folder ch10b, which contains several files.

The site name (the characters before the underscore symbol) can be matched up in the list of available monitoring sites or the text file called lvc_hydrology_locations.txt. Data types are given after the underscore in the file name and include:

airtp	air temperature
dis	discharge, mean daily computed from gage heights
dismeas	instantaneous discharge measurement by meter
gageh	gage height with arbitrary datum
tlog	temperature with depth in wells
tp	temperature, for water temperature unless otherwise noted
venttp	temperature of gas discharged from steam vent
wl	water level in a well given as depth to water below land surface
wq	chemical analysis of water sample

Download files to desktop
1. Go to the MonitoringData/Hydrologic folder to download the data

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