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Surface-water runoff is a function of many interrelated factors including climate, soils, land-use, and the physiography of the drainage basin. A practical and effective method to quantify drainage basin characteristics would allow analysis of the interellations of these factors, leading to an improved understanding of the effects of drainage basin characteristics on surface water runoff. Historically the quantification of drainage basin characteristics has been a tedious and time-consuming process. Basinsoft made improvements by automating the process of calculating these characteristics, and these Geoprocessing tools extend those methods to take advantage of the latest ESRI ArcObjects tools available to provide a more efficient, automated procedure for quantifying selected morphological characteristics of a drainage basin.

BasinTools installers are available for both ArcGIS Desktop 10.0 and ArcGIS Desktop 9.3.1.

Please visit our store to purchase BasinTools.

NOTE: BasinTools requires the Spatial Analyst extension.

NVS Vector Stream Tool is a user-friendly ArcCatalog Toolbox geoprocessing tool for either ArcGIS Desktop 9.3.1 or ArcGIS 10 for Desktop. NVS Vector Stream Tools simply assigns a numeric order to segments of a polyline featureclass. Unlike the Spatial Analyst Tools for Hydrography, this tool solely uses vector stream data instead of raster stream data accompanied by a flow direction raster. The output of this tool is somewhat dependant on the input featureclass: If the input is a coverage the output is treated like a calculation and added to the map with all the fields of the coverage, otherwise input featureclass is modified in place. Either way a stream order field defined by the user is added to the output (or overwritten if the field already exists) and the values are updated to show the stream order value of each stream.

The inputs for the NVS Vector Stream Tool are as follows:

• Streams Feature Layer
Defines the drainage network of streams in a vector format. This layer does have a few requirements:
Fields "FNODE#" and "TNODE#" defining the source and destination nodes of each edge in the stream network.
If you do not have these fields you can generate them by converting the stream layer to a coverage.
You can also alternatively use "FNODE_" and "TNODE_" if not using a coverage




• Output Field
This is the name of the field in the output that will hold the stream order number. If the input is a coverage the output is treated like a calculation and added to the map with all the fields of the coverage, otherwise input featureclass is modified in place. Either way, this field is added to the output (or overwritten if the field already exists) and the values are updated to show the stream order value of each stream.



• Stream Order Method
The method used for assigning stream order.
• STRAHLER — The method of stream ordering proposed by Robert E. Horton (1945) and Arthur Newell Strahler (1952, 1957). All streams with no tributaries are assigned a base order of one and they only increase when streams of the same order intersect. Therefore, the intersection of a first-order and second-order link will remain a second-order stream, rather than create a third-order stream. This is the default.


• SHREVE — The method of stream ordering by magnitude, proposed by Shreve in 1967. All links with no tributaries are assigned a magnitude (order) of one. Magnitudes are additive downslope. When two links intersect, their magnitudes are added and assigned to the downslope link.

Stream Order Example Output:

Click here for instructions on adding the NVS Vector Stream Tool to ArcGIS 10 (PDF)