hydrology

As an adjective hydraulic

is pertaining to water.

As a noun hydrology is

the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere.

As a noun hydrology

is the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere.

As an adjective hydrometric is

concerning or applying hydrometry.

As a noun hydrology

is the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between meteorology and hydrology

is that meteorology is the science that deals with the study of the atmosphere and its phenomena, especially with weather and weather forecasting while hydrology is the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere.

As nouns the difference between hydrology and geohydrology

is that hydrology is the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere while geohydrology is hydrogeology.

As nouns the difference between hydrology and limnology

is that hydrology is the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere while limnology is the science concerning the biological, physical and geological properties of fresh water bodies, especially lakes and ponds.

As nouns the difference between aquatics and hydrology

is that aquatics is sports involving water while hydrology is the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere.

As nouns the difference between hydrology and hydrogeology

is that hydrology is the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere while hydrogeology is the geology of groundwater, especially concerning the physical, biological and chemical properties of its occurrence and movement.

As nouns the difference between hydrology and hydraulics

is that hydrology is the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere while hydraulics is the engineering science that deals with practical applications where liquid is in motion and transmits energy.

As nouns the difference between geology and hydrology

is that geology is the science that studies the structure of the earth (or other planets), together with its origin and development, especially by examination of its rocks while hydrology is the science of the properties, distribution, and effects of water on a planet's surface, in the soil and underlying rocks, and in the atmosphere.