_PERMIT FILE - M1981302 ‎(24)‎

• Permit No: M1981302
• IBM Index Class Name: Permit File
• Doc Name: WATER RESOURCES
• Media Type: D
• Archive: No

During the winter and early spring the ground water table
will drop as a result of natural discharge to the north,
contribution to South Boulder Creek and Dry Creek No. 2
Ditch and evapotranspiration from plant surfaces.
There are no irrigation wells located in the South Boulder
Creek valley in the vicinity of the project site. There are,
however, some individual domestic wells used for water supply
purposes. These wells are normally completed to the top of
the Pierre shale with depths ranging from 10 to 20 feet.
These wells typically yield 10 to 15 gallons per minute.
Drainage and Flood Control. A portion of the site is located
• within the designated 100-year floodplain of South Boulder
Creek as defined by the Urban Drainage and Flood Control
District. This is shown in Figure C-1. Flooding of the
site occurs from two sources : overflow from South Boulder
Creek and overland flow entering the site from the southwest
as the result of inadequate channel and bridge capacity
south of Marshall Road and State Highway 93.
The designated 100-year flood discharge at the site is 5600
cfs. South Boulder Creek has a bank full capacity of
• approximately 1700 cfs which is equivalent to the discharge
through the bridges at State Highway 93 and Marshall Road.
The additional 3900 cfs overtops the two highways and flows
C-3