PERMFILE43690

• Permit No: M2003091
• IBM Index Class Name: Permit File
• Doc Date: 6/30/2004
• Doc Name: Appl for Flood Hazard Permit
• From: Banks & Gesso
• To: LaFarge West Inc
• Media Type: D
• Archive: No

2.0 HYDROLOGY
The Boulder Creek and Idaho Creek Zone A 100 year floodplain is shown on the FEMA
Flood Insurance Rate Map (FIRM) No. 080266-0850C dated September 28, 1982. No
base flood elevations are available for the FIRM map.
Three sources were used to estimate the 100 year flood water surface elevations shown
on the attached Flood Hazard Development Permit Map. They are:
• Colorado Water Conservation Board (1977)
CP Engineering (April 18, 2001)
Tuttle Applegate, Inc. (Nov. 1999)
CP Engineering and Tuttle Applegate, Inc. submitted and received approval for Flood
Hazard Development Permits on properties immediately south and immediately north of
the Duckworth property, respectively. The property to the south is Lafarge's Cottonwood
Pit and the property to the north is the Lighthouse Cove development. The approved
100 year flood water surface elevations for these properties were used to extrapolate the
flood surface elevation at the conveyor crossing Location. The elevations are shown on
the Flood Hazard Development Permit Map.