analysis of sediment yield from unpaved roads. phase i: unpaved roads inventory field data...
TRANSCRIPT
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Analysis ofAnalysis ofSediment Yield fromSediment Yield from
Unpaved RoadsUnpaved Roads
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Phase I: Phase I: Unpaved Roads InventoryUnpaved Roads Inventory
Field Data CollectionField Data Collection
subwatershed scalesubwatershed scale ~90 miles of roads~90 miles of roads diversity of land use/coverdiversity of land use/cover area of public buy-inarea of public buy-in line and point featuresline and point features
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Data CollectionData Collection
Line FeatureLine Feature– RoadRoad
Point FeaturePoint Feature– CulvertCulvert– Cross DrainCross Drain– Wing DitchWing Ditch– BridgeBridge– Etc.Etc.
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Data Dictionary: Road SegmentData Dictionary: Road SegmentGPS Feature Feature Attribute Attribute Value
Road name
Road number
Surveyors/date
primitive 2 track
single lane no ditch
Dbl lane no ditch
single lane with ditch
dbl lane with ditch
other
vegetated
no vegetation
none
1 - 12 inches
> 12 inches
native
spot
gravel
asphalt
other
local
collector
arterial
other
unclassified
Drive in
ATV access
walk-in only
other
ruts < 2 inches
ruts 2-6 inches
rill erosion 6-12 inches
rill erosion >12 inches
no ruts
yes no
dip
water bar
culvert
lead off ditch
other
adequate
inadequate
not needed
blocked
properly functioning
inlet bent
undersized % Blockage
Type
Cros
sdra
ins
Functional class
Road access
Road surface erosion
Road
Seg
men
t Berm Present
Road template
Ditch Vegetation
Ditch erosion
Surface
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Data Dictionary:Data Dictionary:Culvert Stream CrossingCulvert Stream Crossing
GPS Feature Feature Attribute Attribute Value
open
partial
blocked
forest floor
stream course
pasture
pond
yes
no Comment
low
moderate high
Culvert size Diameter and # of Barrels
galvanized not rusted
galvanized partly rusted
galvanized badly rusted
asphalt
plastic
concrete
other
Step bevel
Square
Other
Minor- hand clean
Moderate
heavy-need equipment
none
Gravel and cobble
woody debris
none
none
clean up
replacement
no drop
drop 1-6 inches
drop 6-12 inches
drop >12 inches
no drop
drop 1-6 inches
drop 6-12 inches
drop >12 inches Total Pipe Length
Culve
rt -S
tream
Cro
ssing
Culvert Bottom
Culvert lip
Debris
Inlet blockage
Repairs needed
Fish passage inlet
Fish passage outlet
Priority
Wing ditch
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Slab Stream CrossingsSlab Stream Crossings
GPS Feature Feature Attribute Attribute Value
slab w/ culverts
slab w/out culverts
other Span
adequate
inadequate
blocked
minor- hand clean
moderate
heavy-need equipment
none
no drop
drop 1-6 inches
drop 6-12 inches
drop >12 inches
no drop
drop 1-6 inches
drop 6-12 inches
drop >12 inches Total Pipe Length
Comment
low
moderate high
Fish passage outlet
Type
Culvert condition
Debris
Fish passage inlet
Priority
Sla
b -
Str
ea
m C
ross
ing
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Phase II: Phase II: Sediment Yield ModelingSediment Yield Modeling
Field Data CollectionField Data Collection On 10% of Inventoried On 10% of Inventoried
RoadsRoads Stratified Random Stratified Random
SampleSample Stratified by # of Stratified by # of
Lanes, Ditch ErosionLanes, Ditch Erosion Results are Results are
Extrapolated to other Extrapolated to other RoadsRoads
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Figure 2.Figure 2.
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Workshop FormatWorkshop Format
Introduction to RiversIntroduction to Rivers Importance of Roads & Importance of Roads &
Sediment DeliverySediment Delivery WCRCWCRC Road Construction & Road Construction &
maintenance BMPsmaintenance BMPs
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Field DemonstrationsField Demonstrations
on siteon site partnerspartners materials & equipmentmaterials & equipment site selection processsite selection process
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DiscussionDiscussion