BUDS
Buffer strips (filter strips, vegetated filter strips, grassed buffers)
Built environment
Bulkhead
Bulkhead gate
Bulking
Burden
Bureau of Indian Affairs (BIA)
Bureau of Land Management (BLM)
Bureau of Reclamation (USBR, Reclamation, BOR)
Bus (buswork)
Busbar
Butt joint (open joint)
Butterfly valve
Buttress dam
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Cairn
Caisson
calcite
Caldera (crater)
Camber
Canal
Canal headworks
Canal prism
Candidate species
Capability
Capable fault
Capacity
Capillary action (capillarity)
Capillary attraction (capillary force)
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