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<br />0031:~ <br /> <br />, <br /> <br />T~AT THE INVERT SECTION OF THE STILLING POOL WAS RAPIOLY DETERIORATING AND SOME TYPE <br /> <br />OF PREVENTIVE MAINTENANCE WAS REQUIRED. <br /> <br />AFTER CONSIDERING SEVERAL ALTERNATiVeS, IT <br /> <br />. <br /> <br />WAS CONCLUDED THAT REPAIR SHOULD CONSIST OF INCREASING THE FLOOR THICKNESS BY SIX <br /> <br />INCHES. USE OF A COMMERCIAL BONDING AGENT AND SURFACE AGGREGATE HARDENER WAS INCOR- <br /> <br />PORAlEO ~ITH THE CONCRETE PLACED. THE REPAIR vaS WILL BE INSPECTED AFTER THE NEXT <br /> <br />I~RIGATION SEASON TO SEE IF THE TECHNIQUES USED WEPt S~CCESSFUL. <br /> <br />THE STILLING POOL FLOOR IS SUBJECTED To HIGH VELOCITIES OF FLOW AT THE BASE OF <br /> <br />THE CHuTE BELOW LYONS TUNNEL. <br /> <br />IT IS CERTAIN THAT ADDED ABRASION ARISES FROM ROCKS <br /> <br />WHICH SLOUGH INTO THE CANAL FROM THE STEEP HILLSIDes ALONG ITS COURSE. ROCK SCRE(NS, <br /> <br />APPROXIMATELY TWO FEET IN HEIGHT, WERE PLACED ACROSS THE CANAL INVERT BOTH ABOVE AND <br /> <br />BELOW LYONS TUNNEL. WHILE THe SCREEN TRAPPED CONSIDERABLE ROCKY MATERIAL, THEY ALSO <br /> <br />fiLLED WITH AN EXCESSIVE QUANTITY OF OTHER DEBRIS. <br /> <br />IT IS APPARENT THAT SOME ALTeRNATIVE <br /> <br />TYPE or ROCK CHECK WILL BE REQUIRED. <br /> <br />As PREVIOUSLY MENTIONED IN THIS REPORT, GRAVEL BLAN~ET PROTECTION or THE BOULDER <br /> <br />FEEDER CANAL IS APPROACHING COMPLETION. <br /> <br />LAND OWNERSHIP ALONG THE CANAL IS CONSTANTly <br /> <br />CHANGING WITH RESULTANT CHANGES IN THE ~ATTERN OF LAND USE. <br /> <br />IF AND WHEN THE LAND USE <br /> <br />CHANGES TO EXTENSIVE LIVESTOCK GRAZING, IT WILL BE NECESSARY FOR THE DISTRICT TO PROTECT <br /> <br />ITS INVESTMENT IN THE GRAVEL BLANKET BANK PROTECTION BY FENCING THE CANAL RIGHT-Or-WAY. <br /> <br />IN THE PAST, PROTECTION HAS BEEN ACCOMPLISHED BY ERECTING ELECT~IC FENCES. THESE HAVE <br /> <br />BEEN SATISFACTORY WHERE LIVESTOC~ USAGE HAS NOT BEEN A CONTINUOUS YEAR-AROUND PROGRAM. <br /> <br />HOWEVER, DURING THE PAST SEASON, APPROXIMATELY 6,100 LINEAL FEET OF FOUR-WIRE, BARBED- <br /> <br />WIRE rENCE WAS EReCTED. <br /> <br />DURING THE COMING YEAR, SEVERAL EXTENSIVE FENCING JOBS MUST BE <br /> <br />UNDERTAKEN TO BETTER PROTECT THE INVESTMENT IN GRAVEL BLANKET. <br /> <br />IN ~DDITION TO THE MAINTENA~CE ITEMS MENTIONED ABOVE, ADDITIONAL IMPROVEMENT WORK <br /> <br />, <br /> <br />COMPLETED THIS YEAR INCLUDED FOUR PERMANENT CATTLEGUARDS; INSTALLATION OF SEVERAL VARIOUS <br /> <br />SIZE METAL SLIDt GATES IN LIEU OF EXISTING STOP LOGS; TWO FIELD LATRINES; ADDITIONAL <br /> <br />. <br /> <br />-2\- <br />