headwalls
Steep glacial faces
Headwalls are the steep cliffs at the upper end of a glacial cirque or valley, formed by the erosive power of ice.
In mountaineering, a headwall is any imposing vertical or near-vertical rock face at the head of a route: The final headwall stopped our ascent.
In construction, a headwall is a retaining structure at a culvert or drainage pipe outlet.
Dam's water release structure
- reservoirLarge water storage basin
- concreteSolid building mixture
- embankmentRaised earth structure
- foundationUnderlying support structure
structural · overflow · hydrology · retaining · downstream · crest · abutment · engineering
Glacier-carved mountain basin
- couloirSteep mountain gully
- arêteSharp mountain ridge
- moraineGlacier-deposited debris pile
- tarnGlacial mountain pool
cornice · avalanche · snowfield · crevasse · glacier · alpine · bowl · basin
Frequency of sound
- cruxMost important point
- overhangSection projecting beyond support
- verticalAt right angles groundward
- rappelControlled rope descent
belay · anchor · exposure · technical · grade · route · ascent · lead
Underground ore excavation
- driftGradual movement, no direction
- aditHorizontal mine opening
- excavationAct of unearthing
- undergroundBelow ground or countercultural
tunnel · shaft · face · extraction · vein · support · stability · collapse
spillway
Dam's water release structure
- reservoirLarge water storage basin
- concreteSolid building mixture
- embankmentRaised earth structure
foundation · structural · overflow · hydrology · retaining · downstream · crest · abutment · engineering · construction
cirque
Glacier-carved mountain basin
tarn · cornice · avalanche · snowfield · crevasse · glacier · alpine · bowl · basin · firn
pitch
Frequency of sound
rappel · belay · anchor · exposure · technical · grade · route · ascent · lead · multipitch
stope
Underground ore excavation
- driftGradual movement, no direction
- aditHorizontal mine opening
- excavationAct of unearthing
underground · tunnel · shaft · face · extraction · vein · support · stability · collapse · blasting
- canalsGrand Canal, Panama Canal, Suez Canal, Erie Canal, canal boat
- mountain termsAlps, Himalayas, Rockies, Andes, peaks
- drainagedrain, drains, drainage ditch, drain pipe, floor drains
- tunnel termsChannel Tunnel, subway tunnels, bore, TBM, portals
headwallsflats
Dwellings or low shoes
plains · gentle slopes · level ground · plateaus · lowlands