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<br />f:' <br />" <br /> <br />t, <br /> <br />, <br />1. <br /> <br />~ <br /> <br />t <br />f <br />I <br /> <br />~. <br /> <br />I, <br />I, <br />'I' <br />I <br />:f <br />I <br />f <br /> <br />" <br /> <br />I <br />" <br /> <br />(',;- .- roo <br />~~ &;.u <br /> <br />~I ,\ I N A QUE Due T <br /> <br />2.1 <br /> <br />Ope/'otio'll aud 1]lld-utcunnce <br />During the past year a sma]] force averaging eight men with <br />headquarters at Iron Mountain camp patrolled the main aqueduct <br />line and made ~mch repairs as were necessary, <br />Desert rain storms although not abnormal reached cloudburst <br />proportions in localized areas during late July and early August <br />1941, causing considerable maintenance work on patrol roads, and <br />requiring the replacement of backfill over conduits and siphons <br />at several locations. No damage was done to the aqueduct <br />structures as a result of these storms. The majority of the main- <br />tenance crew spent the latter part of July, and the months of <br />August, September, October, and November on the repair of storm <br />damaged patrol roads. <br />Very few severe wind storms have occurred during the past year, <br />consequentl,' the removal of blow sand from the canal sections <br />has been at a minimum. Even under these favorable conditions, it <br />was necessary periodicall.I' to remove sand, silt, and debris from <br />the 27 sand traps in the canal sections and from the large traps <br />adjacent to the Iron, Eagle, and Hayfield pumping plants. Silt <br />deposits in the three-barrel box siphons have been removed by <br />concentrating the water flow in a sing-Ie barrel thus creating a <br />scouring velocity. <br />General maintenance of the canal, conduit, and siphon .sections <br />has required the removal of weeds from canal berms at locations <br />where heavy growth has appeared. Algae growths in the reser- <br />voirs have been controlled b,' the application of copper sulphate as <br />occasion demanded. <br />A fire of undetermined origin destroyed one of the four-room <br />cottages at Iron Mountain camp on August 29, 1941. This cottage <br />has not been rebnilt. <br />Immediately after Pearl Harbor, December 7,1941, most of the <br />regular maintenance and transmis::;ion line cre\\"s were transferred <br />to guard duty. The main aqueduct from Copper Basin westward <br />was patrolled once during the day and once during the night. The <br />transmission lines were patrolled at least once each 24 hours and <br />the major portion thereof both day and night. Later in the month <br />this schedule was modified somewhat to sa\'e cars and tires and to <br />resume some of the necessary maintenance work. Considerable <br />camouflaging was done on all aluminum-painted metalwork in <br />structures. Steel manhole covers in siphons and adit doors of <br />tunnels were welded closed. <br />