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<br />1-..-.. <br /> <br />000%5 <br /> <br />3.6 <br /> <br />Table 3.1. Summary of General Basin Characteristics. <br /> <br />Characteristic <br /> <br />Area <br /> <br />Maximum Elevation <br /> <br />Minimum Elevation <br /> <br />Upper Oasin Slopes <br /> <br />Average Upper Basin Slope <br /> <br />Upper Channel Slope <br /> <br />Debris Fan Slopes <br /> <br />Average Debris Fan Slopes <br /> <br />Major Debris Source <br /> <br />Composition of Debris <br /> <br />Geology of Headwa ters <br /> <br />". <br /> <br />Portland Creek <br /> <br />2.8 <br /> <br />.2 <br />m~ <br /> <br />12,800 <br /> <br />7,725 <br /> <br />30 to 100' <br /> <br />80' <br /> <br />15 to 67% <br /> <br />8 to 10' <br /> <br />9' <br /> <br />Rockfall slopes, <br />glacial drift and <br />thick colluvium, <br />and landslides <br /> <br />Larger percentage of <br />fines and rounded <br />cobbles <br /> <br />San Juan Volcanic <br /> <br />Cascade Creek <br /> <br />1.3 .2 <br />IIlJ. <br />12,800 <br />7,685 <br />30 to 70' <br />45' <br />15 to 30' <br /> <br />4.5 to 18\ <br /> <br />13% <br /> <br />Talus slopes, rockfall <br />slopes, and thick <br />colluvium <br /> <br />Larger percentage of <br />coarse, angular boulders <br />and less fines and <br />rounded cobbles <br /> <br />San Juan Volcanic <br /> <br />j <br /> <br />., <br />'. <br />" <br />< <br />j <br />.,. <br />(. <br /> <br />