Post on 19-Jan-2016
Analysis ofAnalysis ofSediment Yield fromSediment Yield from
Unpaved RoadsUnpaved Roads
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
Data CollectionData Collection
Line FeatureLine Feature– RoadRoad
Point FeaturePoint Feature– CulvertCulvert– Cross DrainCross Drain– Wing DitchWing Ditch– BridgeBridge– Etc.Etc.
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
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
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
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
Figure 2.Figure 2.
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
Field DemonstrationsField Demonstrations
on siteon site partnerspartners materials & equipmentmaterials & equipment site selection processsite selection process
DiscussionDiscussion