Land resource regions generally are designated by capital
letters and identified by descriptive names (example: Region K). The dominant physical characteristics of the land resource regions are briefly described. More detailed descriptions of the major land resource areas follow the Area descriptions..
Topography and natural features of each area are described. General geographical information is included. Units of elevation and relief are feet and meters. The units are typically rounded to the nearest 5 or 10 feet or meters. If the elevation is less than 50 feet or 15 meters, it generally is expressed in the nearest whole number. The conversion factor is 3.28 feet per meter.
The climatic data include a range of the average annual precipitation for the driest to wettest parts of the MLRA, the seasonal distribution of precipitation, a range of the average annual temperature, and the shortest, longest, and average length of the freeze-free period.
The extent of the major Hydrologic Unit Areas within each MLRA is given in percent. The major rivers or streams draining each MLRA and any National Scenic or National Wild and Scenic River reaches within an MLRA are identified.
Only the water actually withdrawn from a stream or other water body is reported in the narratives. No in-stream uses, such as generation of hydroelectric power, are included. MLRAs that depend on other areas for water supply and those that furnish water to other areas
generally are identified.
Water use varies annually in each State, depending on land use patterns, population, and wet and dry periods. The 'other' category includes municipal and industrial use, cooling of
thermoelectric power plants, mining, domestic use, and any other miscellaneous water uses.
Flora and Fauna areas are in very broad terms for their respective areas.
Land Usage is the usage of various private and federal lands within each region and area. Categories of land use were combined into cropland, grassland, forest, urban development, water, and other. Grassland includes the categories of pasture,
range, brush, and tundra. Hayland was grouped with cropland.
Included under the heading 'Land Use' is a description of the dominant farming, ranching, or other land use activities in the MLRA. The principal crops are identified where cropland is significant, and major tree species are listed where logging is the dominant land use activity.
Also provided are descriptions of some of the common soil and water conservation practices used to mitigate the impacts of the resource concerns in each MLRA.
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