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EMPOUr1DING WATER. APPROXIMATELY 2800 FEET OF THE CHAr!NEL . <br />WERE RESTRUCTURED TO KEEP THE 41ATER TO THE EAST SIDE OF THE <br />CANYON. TFIIS DIVERSION EXTENDS FROM THE RAILROAD, AT ITS <br />LOWER END. TO A POINT NEAR POr1D C02 AND ABOVE ANY SURFACE <br />DISTURBANCES DUE TO MIrIING. THE DIVERSION CHANNEL HAS A <br />TRAPEZOIDAL CROSS SECTION 15 FEET WIDE AT THE BASE. 45 FEET <br />WIDE AT THE TOP. hND 7 FEET DEEP. IT HAS AN AVEPAGF. SLOPE <br />OF 1.1X. AT MAXIMUM FLOW THIS CHANNEL COULD PASS 2,540 <br />CUBIC FEET OF WATER PER SECOND. IN A STUDY CONDUCTED BY THE <br />SOIL CONSERVATION SERVICE IN FEBRUARY OF 1976. THEY <br />ESTIMATED THE PEAK FLOW FOR A ONE-HUNDRED YEARS STORM WOULD <br />BE ON THE ORDER OF 1200 CUBIC FEET PER SECOND OF WATER. THE <br />CHANNEL WOULD FLOIJ 4,8 FEET DEEP WITH A VELOCITY OF 9.9 FEET <br />f PER SECOND TO PASS THE 12C0 CUBIC FEET PER SECOND OF WATER. . <br />MORE FREQUENT AND THEREFORE LESS INTENSE STORMS WILL RESULT <br />IN MUCH LOWER FLOWS AND VELOCITIES. THE. ENTIRE DIVERSION <br />WAS COMPACTED AND VEGITATED TO MINIMIZE EROSION. THOUGH <br />SOME EROSION WILL OCCUR INITIALLY. THE BEDROCK LYING JUST <br />BELOW THE CHANNEL BOTTOM WILL SOON BECOME THE PERMANENT <br />CHANNEL FLOOR AS IT WAS REFORE THE DIVERSION. AT THE LOWER <br />END OF THE CHANNEL THE WATER FLOWS THROUGH A 7-FOOT DIAMETER <br />CORRIGATED HETAL CULVERT AND A 6-FOOT SQUARE CONCRETE BOX <br />CULVERT UNDER THE RAILROAD WHICH PREDATE ANY MINING <br />OPERATIONS. AN ADDITIONAL 9-FOOT DIAMETER CORRIGATED METAL <br />CULVERT WILL BE INSTALLED PARAI.LF.L TO THE EXISTING CULVERTS <br />TO PASS THE ONE-HII~IORED YEARS STORM. FROM HERE THE WATER <br />FLOWS TO THE PURGATORIE RIVER THROUGH THE NATURAL CHANNEL. . <br />4 <br />