LAV
Geo
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All LavGeo modules
LavGeo Slope
LavGeo Bridge scour
Geometry
Slope height H (m)
Slope ratio, horizontal per 1 vertical
Depth to firm stratum below toe (m)
Upper soil (embankment / cut face)
γ (kN/m³)
γsat (kN/m³)
c′ (kPa)
φ′ (°)
Lower soil (foundation)
Same soil throughout
Boundary elevation above toe (m; 0 = toe level)
γ (kN/m³)
γsat (kN/m³)
c′ or su (kPa)
φ′ (°)
Water and loads
Pore water
None (dry)
Pore-pressure ratio ru
Water table (crest level → toe)
ru (0–0.5)
Water level under crest (m above toe)
Crest surcharge q (kPa)
Seismic coefficient kh
Check
Method
Bishop simplified
Ordinary (DGCS form)
Required FS (DGCS)
1.5 Fill / embankment
1.3 Retaining structure
1.5 Critical wall / abutment
1.1 Seismic (pseudo-static)
1.0 Back-analysis
Find critical circle
Copy results
Section and critical slip circle
Swipe the drawing sideways to see the whole section.
Circle
Checks and flags
Slice table
Site
Road class
Expressway
National road
Other roads
Design discharge Q (m³/s)
Setting
Rural
Urban
Afflux (mm)
River carries debris
Spans (m, comma-separated)
Levels
Bed level (m)
Design flood level DFL (m)
Girder depth (m)
Deck + wearing (m)
Flow
Approach depth y1 (m)
Approach velocity V1 (m/s)
Velocity through bridge (m/s)
Energy slope S (m/m)
Bed material
D50 (mm)
D95 (mm)
Long-term degradation (m)
Contraction
Approach flow Q1 (m³/s)
Flow through bridge Q2 (m³/s)
Approach width W1 (m)
Bridge width less piers W2 (m)
Existing depth in bridge opening y0 (m)
Pier
Width a (m)
Length L (m)
Nose shape
Round
Circular cylinder
Square
Sharp
Group of cylinders
Angle of attack (°)
Bed condition
Plane bed / antidunes
Clear-water
Small dunes
Medium dunes
Large dunes
Abutment
Type
Spill-through
Vertical wall
Vertical with wing walls
Embankment angle θ (°)
Length blocking flow L′ (m)
Area blocked Ae (m²)
Flow blocked Qe (m³/s)
Protection
Rock specific gravity
Pier location factor K2 (0.9–1.7)
Compute scour
Copy results
Scour at pier and abutment
Site checks
Design floods (Vol. 5 Table 3.2.5-1)
Contraction scour
Pier scour (CSU / HEC-18)
Abutment scour
Protection and profile
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