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Subject
- Floods4,859
- Flood control868
- Rivers, creeks, streams, etc416
- History379
- Disaster relief349
- Destruction of property320
- Claims314
- Hydrographic surveying310
- Flood forecasting281
- Floodplains265
- Levees255
- Stream measurements239
- Cost224
- Legislative amendments221
- Dams202
- Reservoirs167
- Navigation improvements150
- Flood damage prevention132
- Channels (Hydraulic engineering)131
- Flood damage122