2016-09-02_HYDROLOGY - M1992069 - Laserfiche WebLink

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Mr. Roger Schmidt September 2, 2016 Page 4 Year/ Description of Conditions / Events Time Frame 1999 to 2001 The Boyd-Freeman Ditch was relocated by Al to its current alignment: (sometime in this period, based on • The original ditch alignment had a direct path through the current aerial imagery) location of the gravel pit. • The ditch was realigned to allow more space for expanded gravel pit operations. • Construction of the ditch realignment was performed by Al. • The ditch remained as an open channel conveyance in its new alignment. • No known engineering design/drawings exist for the realignment project. 2007 • The last excavation occurred at the Al pit(per Al annual Division of Reclamation, Mining and Safety [DRMS] report, Feb. 2015). 2010 (June) • A ditch failure/breach occurred where the ditch turns from west/east to south/north. 2011-2012 • BIC makes repairs to the ditch failure/breach that occurred in June 2010. • The Iverson/Martin Marietta gravel pit was developed on the west side of the bike path, east of the Cache La Poudre River. 2011-2012 • The open channel Boyd-Freeman Ditch was replaced with 48-inch HDPE pipe (Note: drawings show PVC pipe, but HDPE was ultimately used) o Design drawings were prepared for BIC (April 2011). o Engineering and construction was performed and paid for by the BIC. o Approximate cost of repairs: $720,000. 2013 (September) Flooding causes flow to overtop the Cache La Poudre bank, flood the F Street agricultural field and breach the Boyd-Freeman Ditch embankment and the pipeline. o A section of pipeline is breached and washed out. o Repairs to the pipeline were made by and paid for by the BIC, including on the east side of the pipeline embankment(Al side). The cost of the repairs was approximately$80,000. o The location of the damage and repairs was the same general location as where the major pipeline breach later occurred in 2014. o No headcut formed on the F Street agricultural field in 2013.