Hydrology is the study of water, its source, distribution, quantity, quality, and
movement. For the purpose of this Storm Water Design Criteria Manual (SWDCM), the
hydrology guidance will be limited to surface hydrology; the portion of the hydrologic
cycle that deals specifically with precipitation, infiltration, and surface runoff.
This chapter describes the specific precipitation data which has been defined by federal
and state agencies and regionalized to Bexar County. This chapter will also address
infiltration and surface runoff by providing guidance on Methods of Analysis (Chapter 5.3) that range from small local analysis (i.e. Rational Method) to the hydrograph methods
as well as guidance on probable maximum precipitation, with equation parameters specific
for this region. The selection of these methods will be determined by drainage area
size and purpose of the study. The proper application of these methods will generate
discharge values that may be used for planning, design, mitigation, or regulation.
Other methods of proven engineering use may be used with approval from the Director
of TCI or his authorized representative.
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