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Subject
- Hydrographic surveying497
- Channels (Hydraulic engineering)479
- Navigation improvements345
- Cost319
- Rivers, creeks, streams, etc270
- Flood control217
- Harbors and ports214
- Dredging187
- Levees92
- Reservoirs78
- Construction77
- Coastal and beach erosion66
- Dams61
- Floods60
- Canals47
- Dikes (Engineering)46
- Breakwaters45
- Bays and inlets38
- Coasts and coastlines38
- Piers37