Presentation 12:
Vegetated Earth Spillways - Inspection,
Maintenance, and Monitoring
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Vegetated Earth Spillways
Inspection - Maintenance
&
Monitoring 
Denver, CO
August 26-27,2003
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
OUTLET SECTION  EXIST. AUXILIARY SPILLWAY
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
About 2.5 of flow with little or no damage
Well maintained dam
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Spillway Looks like it has been well maintained
Tire Tracks
Equipment used for maintenance destroyed vegetation
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Trail develops into a major erosion problem.
Erosion in Spillway
Can you see the dam?
Road Up the Spillway
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Other uses  Trailer in spillway used for a home site
Hp on spillway = 0.5
Standing in entrance of Aux.
S/W looking at front slope of
Dam  good vegetation
Mud line
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Standing in entrance of Aux. S/W
Looking upstream  good vegetation
Vegetation in crest no good
Hay bales in control section
Standing in entrance to Aux. S/W looking downstream
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Almost no vegetation
Standing in control section looking downstream
Control Section
Standing in Aux S/W looking upstream
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Road
Standing in Exit Channel of Aux. S/W looking upstream
FEMA Workshop - Issues, Remedies and Research Needs Relating 
to Service and/or Emergency Spillways
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Hickory Creek Site 11  Hay feeding on control section, cattle working pens in exit section
Vegetation - wrong kind
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Vegetation  when was the last time the spillway was mowed?
High Hazard Dam
Dam
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
High Hazard Dam
Same Car and House
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Dam overtopped about 0.5 and the spillway had about a 5.2 Hp on it.
5.2 Hp on crest of this spillway  little or no damage
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Same spillway after the flow event. Minor damage.
Damage to dam from overtopping  about 0.5
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Homogeneous fill??
Spillway with debris from flow event and vegetation
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Erosion in spillway from a flow event
More erosion from a flow event. Note maintenance and vegetation good.
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways
Headcut erosion from flow event.
The End
FEMA Workshop - Issues, Remedies and Research Needs Relating to Service and/or Emergency Spillways