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<br />1.5 <br /> <br />Table 1.1. Flow Description as Function of Concentration. <br /> <br />Type of Flow <br /> <br />Landsl ide <br /> <br />Landslide <br /> <br />Mud fl ow <br /> <br />Mud fl ow <br /> <br />Mud flood <br /> <br />Mud flood <br /> <br />Mud flood <br /> <br />Water flood <br /> <br />Concentration <br />By Vol ume, Cv <br />(percent) <br /> <br />>64 <br /> <br />50-64 <br /> <br />45-50 <br /> <br />40-45 <br /> <br />35-40 <br /> <br />30-35 <br /> <br />20-30 <br /> <br /><20 <br /> <br />Concentration <br />By Volume, Cw <br />(percent) <br /> <br />>88 <br /> <br />73-88 <br /> <br />69-73 <br /> <br />65-69 <br /> <br />59-65 <br /> <br />54-59 <br /> <br />41-54 <br /> <br /><41 <br /> <br />Flow Characteristics <br /> <br />Will not flow, failure by block <br />sliding or tumbling, <br />Unsaturated soil conditions, <br /> <br />Will not flow, block sliding <br />fa il ure with some i nterna I <br />deformat ion, slow creep pri or <br />to fail ure, saturated. <br /> <br />Flow initiates, plastic <br />deformation with slow sustained <br />creep. Begins spreading, moves <br />subject. t.o repeated vibration. <br /> <br />Mixes easily, shows some fluid <br />properties. Surface may be <br />inclined at rest. Waves <br />dissipate rapidly. <br /> <br />Spreads on hori zona 1 surface, <br />marked particle set.tling, <br />liquid horizontal surface, two- <br />phase separation in qui escent <br />condition, waves travel easily. <br /> <br />Sand and gravel settle, <br />distinct wave action. <br /> <br />Particles rest on bottom in <br />wave mot.ion. <br /> <br />Water flood with bed and <br />suspended load. <br />