The soil texture triangle used by the U.S. Department of Agriculture is converted into a new texture diagram which contains all information in the original triangle, but additionally, gives mean particle size and particle size standard deviation of soil samples. Thus, mechanical analysis information on percents of clay, silt, and sand together with particle‐size limits for clay, silt, and sand are found in a single unified system. The new diagram provides greater resolution in detecting classified soil samples within a texture region, it can be extended to cover coarse fragments, and other soil texture classifications can be incorporated into it.

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This paper extends a procedure for transforming the standard textural triangle into a new diagram based on mean particle size, dg, and standard deviations of particle size, a t . Values of d g and 2 mm. Mean particle size and standard deviates are correlated with soil properties. An application is shown in the form of a relationship between water retention and d K and a g .

This paper presents a comprehensive procedure for evaluating sedimentation impact on the streambed gravels used for spawning by salmonids. It establishes a relationship between embryo survival of incubating eggs and the geometric mean diameter of the substrate. It outlines simple procedures for estimating the overall composition of the gravel in spawning sites along stream reaches and provides the rationale for interpretation of these estimates in terms of overall embryo survival in a stream system. ESTIMATED EMBRYO SURVIVAL IN PERCENT i000 2.5 50 80 90 ,I-- SHIRAZI AND SEIM: SPAWNING HABITAT