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<br />~ . II. . <br />~ \ w. <br />~ "\ I.. . /.J <br />, " <br /> '-- <br /> I I~ '~ 'I "' <br /> #' , <br /> <br />~ <br /> <br />. ", CONTRACTION 1C0Ut <br /> <br /> <br />ROAD <br /> <br />Case 1 Overbank Stream <br /> <br />I--w, <br /> Wz STREAM <br /> NAIlROW <br />~ ~ . . <br />, ~ <br /> -.t, STREAM <br />'. ~ ~ OOWNST <br /> <br />NARROWS. IlliDGE ttr UPPER END OF <br />S. NO OVUIANK FLOW <br /> <br />NARROWS. IRIDGE LOCATED <br />REAM OF NARROW SECTION <br /> <br />r.'~' <br />Wz ~ <br /> <br />IIRIDGE CONTRACTS A STREAM <br /> <br />Case 2 <br /> <br />, <br /> <br />Iv. <br />w, ' <br /> <br />I <br /> <br />:\ <br /> <br />1 <br /> <br /> <br />1 j <br />\. <br /> <br />. <br /> <br />MAIN <br />CHANNEL <br /> <br />RELIEF BIlIDGE ON <br />FLOOO PLANE <br /> <br />'~ <br /> <br />RELIEF IIRIOGE OVER <br />ACTIVE STREAM <br /> <br />CASE 3 <br />Case 3 and 4 <br /> <br />FIGURE 4.1 THE FOUR MAIN CASES OF CONTRACTION SCOUR <br />22 <br />