Hydrologic data, 1965 - Department of Water Resources - State of ...

and minimum data are recorded on the date read even though the
recorded reading may actually have occurred on the preceding
day.
At evaporation stations daily observations are taken
of the amount of water in inches evaporating from an open pan,
of wind movement in miles per day over the pan, and the
temperature of the water. At some evaporation stations,
observations are taken of temperature and moisture content of
the soil, and of dry and wet bulb temperatures of the air.
Evaporation stations are equipped with (1) an evaporation pan
with a stilling well and gage, and (2) an anemometer, and, when
required, a wet and dry bulb psychrometer and a water storage
tank. These stations also serve as temperature and precipi-
tation stations as described above.
Coding
The numbering system used by the Department was de-
veloped to facilitate station identification by data processing
machines. Station numbers are composed from three components -
the drainage basin number, the alpha order number, and the
subnumber
Drainage Basin Designation . The State was divided
into major hydrographic areas, and each of these areas was
assigned an alphabetical letter which is the first digit of
the drainage basin number. The second digit was obtained by
dividing the major hydrographic areas into stream basins of
primary importance and assigning a number of 0-9 with
generally being the valley floor.
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