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FIG. 3.1 <br />TYPICAL INSTREAM HEADCUTTING <br />CONTROL STRUCTURE <br />3~ THICK LAYER OF <br />GROUTED H OR VH TYPE ROCK <br />TYPE VH ROCK <br />DEPTH <br />AS <br />REQ IRED 5• <br />5~ II 20~ <br />SHEET PILING DRIVEN <br />TO REFUSAL AND TIED <br />TOGETHER AT TOP. <br />5~ <br />U <br />Z <br />F <br />I <br />0 <br />DEPTH OF SHEET PILING, GUAGE OF PILING, <br />SIZE OF ROCK, AND ROCK AND FILTER GRADATIONS <br />ARE TO BE DETERMINED BY A REGISTERED <br />ENGINEER ON A SITE SPECIFIC BASIS AND ARE <br />TO BE SUBMITTED TO THE COUNTY ENGINEER <br />FOR APPROVAL. <br />PROVIDE AN OPENING FOR LOW FLOWS, SAFE <br />PASSAGE OF BOATERS AND FISH MIGRATION. <br />THE LAW FLOW OPENING SHALL BE DESIGNED IN <br />STEPS OF POOLS AND CHUTES WITH THE LAST <br />CREST OF THE DOWNSTREAM CHUTE BEING AT <br />THE PROJECTED TAILWATER WHEN ALL GRAVEL <br />IS REMOVED FROM THE PIT. THE VERTICAL <br />DISTANCE BETWEEN SUCESSIVE CRESTS SHALL <br />MOT EXCEED IB• INCHES. <br />UD 8 FCD GRAVEL GUIDELINES IZ/1~/~7 <br />3-4 <br />