_PERMIT FILE - M1981302 ‎(20)‎

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

streamflow, and irrigation may cause the water table to
rise up to 5 feet during the late spring and early summer
months.
Water Quality. Sampling of South Boulder Creek has shown
that present water quality is well within the standards of
the classification assigned by the Colorado Water Quality
Control Commission. During periods of heavy precipitation
and snow melt, the creek will be high in the quantity of
suspended solids and turbidity. During dry periods, most
of the stream recharge will be from ground water which is
naturally filtered and the turbidity and concentrations of
suspended solids will be negligible.
Drainage and Flood Control . A substantial portion of the
site is located within the 100-year floodplain of South Boulder
Creek as defined by the Urban Drainage and Floodplain Control
District. The 100-year floodplain is shown in Figure C-1.
The South Boulder Creek channel capacity of 1700 cfs.
approximates a 5-year recurrence interval . Flows exceeding
this amount cause local flooding of South Boulder Creek.
Flooding in this general area occurs from two sources: (1)
overflow from South Boulder Creek, and (2) overland flow
• entering the site from the southwest as a result of inadequate
channel and bridge capacity south of Marshall Road and State
C• Highway 93. These result in shallow overland flooding. A
A-6