Having to do with water, or the study of it on the earth.
                                                            
                                                     
                        
                                                
                        
                        
                            the properties, distribution, and circulation of water on and below the earth's surface and in the atmosphere
                                                            
                                                     
                        
                                                
                        
                        
                            Hydrology is the science dealing with the waters of the earth, their distribution on the surface and underground, and the cycle involving evaporation, precipitation, flow to the seas, etc.
                                                            
                                                     
                        
                                                
                                                     
                        
                        
                            pertaining to the properties, distribution and flow of water.
                                                            
                                                     
                        
                                                
                        
                        
                            cycle the circulation of the Earth's waters from ocean to atmosphere to land and back to ocean
                                                            
                                                     
                        
                                                
                        
                        
                            Relating to the occurrence and properties of water. Hydrologic hazards include flooding (the rise of water) as well as hydraulic hazards associated with the movement of water.
                                                            
                                                     
                        
                                                
                        
                        
                            relating to the distribution and movement of water.
                                                            
                                                     
                        
                                                
                        
                        
                            Pertaining to the cyclic phenomena of waters of the earth; successively  as precipitation,  runoff,  storage  and  evaporation,  and  quantitatively  as  to   distribution  and concentration.
                                                            
                                                     
                        
                                                
                        
                        
                            concerning water on the earth's surface, in the soil and underlying rocks and in the atmosphere