asdi.water.STREAM_ORDER_ADEQ

Stream Order Classification is becoming a popular additive to the NHD. The purpose of this dataset is to help others in the state determine which streams are the starter streams, and which streams are the higher order streams. The starter streams are the first order streams, and are located in the upper parts of a watershed. Water enters the first order streams from over land, seeping groundwater, or springs. Second order streams are fed by two or more first order streams. Third order streams are fed by two or more second order streams. This continues through to the highest order stream, which is the Mississippi River. This order classification process is important to most state agencies, because the higher the order, the more likely the stream is influenced by events occurring higher up in the watershed.

This dataset consists of the medium-resolution NHD (National Hydrography Dataset), developed at 1:100,000 scale. This dataset was created using the NHDPlus tool, developed by Horizon Systems Corporation. The NHDPlus tool uses the Strahler method of Stream Order Classification. This method classifies streams based on where they lie in relation to other streams in a watershed.

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