For a majority of the perennial streams in San Antonio and its ETJ, the hydrology
models will not account for any base flow condition. It is recommended that the design
engineer visit the study stream to observe average conditions.
5.6.1.3.2
Constant Monthly Baseflow
As defined in the HEC-HMS technical Manual of March 2000 "[the base flow parameter
is] best estimated empirically, with measurements of channel flow when storm runoff
is not occurring. In the absence of such records, field observation may help establish
the average flow&hellipfor most urban channels and for smaller streams in the western
and southwestern US, the baseflow contribution may be negligible."
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