54. Surface water hydraulic analysis
Problem: stormwater washing out road
during construction
Who is responsible for extra costs?
54
55. Analysis procedure
Map problem areas
Map contributing drainage area(s) for
each
Calculate design flow for each drainage
area
Calculate design drainage for each
problem area
Based on road linear foot
55
58. Analysis continued
Calculate flows from actual storm
Compare with design flows (design was
greater)
Estimate necessary size of diversion
structures
Compare with original design
58
78. Georeferencing is imprecise
Nature of aerial imagery from low-flying
aircraft
Distortion away from flightline
Vast changes in landscape & development
Few tie-points
78
79. This one is better due to increased
tie-points 79
82. Analysis
Boulder came from state land
Unclear if it was from land previously
“worked”
Recommend field investigation
May be possible to determine exact location
Can assess future hazards
82