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<br />16 <br /> <br />. <br /> <br />. <br /> <br />~cJcu, <br /> <br />Drop in Bon Lev, I <br /> <br />==::_~.~ L (j <br />P'H ~_ ~ .... <br />Tribulory /:> <br />'-- ~'~';~.;~~onn' I <br /> <br />. <br /> <br /> Local Effects Upstream Effects Downstream Effects <br />1. Headcutting 1. Increased velocity 1. Increase transport to . <br />2. General scour 2. Increased bed main channel <br />3. Local scour material transport 2. Aggradation <br />4. Bank stability 3. Unstable channel 3. Increased flood stage <br />5. High velocity 4. Possible change of 4. Possible change of <br /> form of river form of river <br /> . <br /> <br />Figure 2-4. Lowering of base level for tributary stream. <br /> <br />. <br /> <br />. <br /> <br />SIup <br /> <br /> <br />AlIvvtOt <br />'00 <br /> <br />Flot <br /> <br />~ '. <br />'..'4. ~I."J <br /> <br />. <br /> <br />Local Effects <br /> <br />1 . Alluvial fan reduce <br />waterway <br />2. Channel location is <br />uncertain <br /> <br />Upstream Effects <br /> <br />1. Erosion of banks <br />2. Unstable channel <br />3. Large transport <br />rate <br /> <br />Downstream Effects <br /> <br />1 . Aggradation <br />2. Flooding <br />3. Development of tributary <br />bar in the main channel <br /> <br />. <br /> <br />Figure 2-5. Rising base level for tributary stream. <br /> <br />. <br /> <br />. <br />