An overview of the Hydrology toolset

These tools model the flow of water across a surface.


The raster analysis portal tools are available when you are signed in to an ArcGIS Enterprise portal that has ArcGIS Image Server configured for Raster Analysis. When a tool is run, ArcGIS Pro serves as a client and the processing occurs in the servers federated with ArcGIS Enterprise. The portal tools accept layers from your portal as input and creates output in your portal.

The tools will not work if your active portal is ArcGIS Online.

These tools can be accessed from either the Analysis ribbon or the Geoprocessing pane's Portal tab.

Learn more about portal tools



Fills sinks in a surface raster to remove small imperfections in the data.

Flow Accumulation

Creates a raster of accumulated flow into each cell.

Flow Direction

Calculates the direction of flow from each cell to its downslope neighbor or neighbors using the D8, D-Infinity (DINF), or Multiple Flow Direction (MFD) method.

Flow Distance

Computes, for each cell, the horizontal or vertical component of downslope distance, following the flow paths, to cells on a stream into which they flow. In the case of multiple flow paths, minimum, weighted mean, or maximum flow distance can be computed.

Stream Link

Assigns unique values to sections of a raster linear network between intersections.


Determines the contributing area above a set of cells in a raster.

Tools of the Hydrology toolset

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