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<br />(FIRST DRAF'T - SUBJECT TO CHANGE) <br /> <br />Supplement....... (Rev. 5/19/72) <br />(Explanation of terms and footnotes for TABLE OF CHARACTE~ISTICS FOR SQIL <br />ASSOCIATIONS -- COIDRADO STATE KEY FOR COUNTY GENERAL SOIL MAPS,;) ., <br /> <br />ES'rUIATFD PROPERTIES and ratings for each component of the soil associations <br />are based on dominant conditions. Variations from the dominant conditions <br />can be expected within most components. . <br /> <br />Map users needing more detailed explanations than furnished in this s~ple- <br />ment are referred tothe following references: . <br /> <br />(1) SOIL CONSERVA'tION SERVICE <br />1971 Guide for Interpreting En~ineering Uses of Soils <br /> <br />. . <br />( 2) U. S. DEPARTMENT OF AGRICULTURE <br />1951 Handbook No. 18, Soil Survey.Manual <br /> <br />(3) <br /> <br />SOIL CONSERVATION SERVICE <br />1960 with amendments thTough-197l <br />Soil Classification, a Comprehensive System -.7th Approximation <br /> <br />. Soil association. A mapping unit used on general soil maps in which two or <br />more defined taxonomic units occurring together in a char~cte~istic.pattern <br />are combined on the map into one unit.. The component s of the soUl;Issocia",'. . <br />.' ,..,', l' <br />tion mayor may not be contrasting..- - <br /> <br />~:;<::':';~ , <br />Soil slope. A soil characteristic -normally measured with a hand level and <br />expressed in terms of percentage -- -the differen,ce in elevation for ea,cp <br />100 feet horizontal. ~he following slope class ranges and descriptive terms. <br />were used: <br /> <br />0-'3 percent <br />3-9 .IJercent <br />9-15 percent <br />15-25 percent <br />more than 25 percent <br /> <br />nearly level <br />gently sloping <br />sloping . <br />moderately steep <br />steep' <br /> <br />Bedrock. Any solid underlying rock. (Includes sandstones and shales that <br />can be penetrated with digging equipment.) <br /> <br />Permeability. Soil permeability is that quality of soil that enables it to <br />transmit water and air. Accepted as a measure of this quality is the rate <br />at \olhich soil transmits water while saturated. That rate is the "saturated <br />hydraulic conductivity" of soil physics. <br /> <br />Permeability estimates apply to the lowest permeability rate <br />of the B2_ horizon or .control section of the soil profile. The following <br />classes are used: <br /> <br />Permeability class <br />Very slow <br />Slow . <br /> <br />Numerical range (inches per hour) <br />Less than 0.06 <br />0.06-0.2 <br />