hydrograph

As a noun hydrograph

is a graph of flow past a point in a river versus time.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between hydrograph and null

is that hydrograph is a graph of flow past a point in a river versus time while null is zero, nil; the cardinal number before einn.

As a noun hydrograph is

a graph of flow past a point in a river versus time.

As nouns the difference between hydrography and hydrograph

is that hydrography is (nautical) the scientific measurement and description of the physical features and conditions of navigable waters and the shoreline while hydrograph is a graph of flow past a point in a river versus time.

As nouns the difference between hyetograph and hydrograph

is that hyetograph is a graphical representation of rainfall over time while hydrograph is a graph of flow past a point in a river versus time.

As a proper noun river

is .

As a noun hydrograph is

a graph of flow past a point in a river versus time.

As nouns the difference between time and hydrograph

is that time is while hydrograph is a graph of flow past a point in a river versus time.

As nouns the difference between flow and hydrograph

is that flow is a movement in people or things with a particular way in large numbers or amounts while hydrograph is a graph of flow past a point in a river versus time.

As a verb flow

is to move as a fluid from one position to another.