| (a) For new water right authorizations in the San Antonio
River Basin and the San Antonio-Nueces Coastal Basin which increase
the amount of water authorized to be stored, taken, or diverted as
described in §298.10 of this title (relating to Applicability),
the determination of the hydrologic condition for a particular season
shall be determined once per season. The conditions present on the
last day of the month of the preceding season will determine the hydrologic
condition for the following season for the applicable measurement
point. For each measurement point specified in the applicable river
or coastal basin, cumulative streamflow for the previous 12 months
will determine the hydrologic condition.
(b) For purposes of permit special conditions related
to hydrologic conditions, for water right applications in the San
Antonio River Basin and the San Antonio-Nueces Coastal Basin, which
increase the amount of water to be stored, taken, or diverted, the
hydrologic condition shall be calculated using the full period of
record for the United States Geological Survey (USGS) gage at each
measurement point such that dry conditions occur approximately 25%
of the time, average conditions occur approximately 50% of the time,
and wet conditions occur approximately 25% of the time.
(c) For purposes of water availability determinations,
for water right permit applications in the San Antonio River Basin
and the San Antonio-Nueces Coastal Basin, which increase the amount
of water to be stored, taken, or diverted, hydrologic conditions used
in the commission's water availability models shall be calculated
such that dry conditions occur approximately 25% of the time, average
conditions occur approximately 50% of the time, and wet conditions
occur approximately 25% of the time, based on the period of record
and simulated flows of the applicable water availability model.
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