FLOOD01374

• Designation Number: 521
• County: Weld
• Community: Erie, Firestone, Dacono
• Stream Name: Tri-town drainageway, Godding Hollow Basin
• Title: South Weld I-25 Corridor Master Drainage Plan
• Date: 9/8/1999
• Prepared For: Weld County
• Prepared By: Anderson Consulting Engineers, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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embankment is estimated to be 3,000 cfs, The lOa-year existing condition discharge in Godding
Hollow at Godding Ditch is 4,510 cfs.
WCR 20 Culvert The crossing at Weld CountY Road 20 is a 6'H x 8'W arch corrugated
metal pipe culvert, At this location, roadway overtopping occurs at a depth of approximately 5.4
feet from the invert of the culvert, The capacity of the culvert prior to overtopping is 210 cfs.
The lOG-year existing condition discharge in Godding Hollow at Weld County Road 20 is 4,580
cfs.

WCR lR Culvert The crossing at Weld County Road 18 is also a 6'H x 8'W arch
corrugated metal pipe culvert, At this location, roadway overtopping occurs at a depth of
approximately 7,5 feet from the invert of the culvert. The capacity of the culvert prior to
overtopping is 190 cfs. The 100-year existing condition discharge in Godding Hollow at Weld
County Road 18 is 4,730 cis.
WCR 16 Culvert The crossing at Weld County Road 16 is a 6'H x 8'W arch corrugated
metal pipe culvert. At this location, roadway overtopping occurs at a depth of approximately 5.1
feet from the invert of the culvert. The capacity of the culvert prior to overtopping is 160 cis.
The 100-year existing condition discharge in Godding Hollow at Weld County Road 16 is 4,740
cis,

State Highway 52 eWeR 14) Culvert The crossing at State Highway 52 (WCR 14) is a
S'H x S'W reinforced concrete box culvert. At this location, roadway overtopping occurs at a
depth of approximately 14,5 feet from the invert of the culvert. The capacity of the culvert prior
to overtopping is 1,000 cfs, The 100-year existing condition discharge in Godding Hollow at State
Highway 52 is 4,000 cfs.
Coalridge Ditch Culvert, At this location, Godding Hollow passes under the Coalridge
Ditch. The crossing at Coalridge Ditch is a TH x TW reinforced concrete box culvert, At this
location, canal embankment overtopping occurs at a depth of approximately 14,1 feet from the
invert of the culvert. The capacity of the culvert prior to overtopping is 790 cis. The 100-year
existing condition discharge in Godding Hollow at the Coalridge Canal is 3,670 cis.
WCR 12 Culvert The crossing at Weld County Road 12 is a 36-inch diameter corrugated
metal pipe culvert, At this location, roadway overtopping occurs at a depth of approximately 5.9
feet from the invert of the culvert. The capacity of the culvert prior to overtopping is 60 cfs, The
100-year existing condition discharge in Godding Hollow at Weld County Road 12 is 2,620 cis.
1-25 East Frontage Ro~d Bridge. This timber bridge incorporates an opening which is
approximately 60 feet wide and 5,5 feet in height. The capacity of the bridge prior to overtoppmg
the roadway is 2,050 cfs, The 100-year existing condition discharge in Godding Hollow at the
1-25 East Frontage Road is 920 cfs.

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September 8. 1999