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SWG-2014-01003 - Hidalgo County Irrigation District #2

Published Dec. 30, 2015
Expiration date: 2/1/2016

Full Public Notice          Plans

PROJECT DESCRIPTION:  In 1981, the applicant obtained a license from the International Boundary and Water Commission (IBWC) to construct a weir downstream of their pumping facility to maintain adequate river levels during periods of low flow.  The weir was constructed shortly thereafter, with no record that a Corps permit was issued at that time.  This application requests authorization for the original weir as it exists and proposes to perform maintenance on the weir to restore it to its original elevation.  The proposed maintenance will restore the applicant’s weir elevation from its current top elevation of 72.5' to 74.0' (NAVD88) as it was constructed and licensed by the IBWC in 1981.  Approximately 325 cubic yards of additional heavy rock riprap fill will be placed on 0.15-acre of the existing weir by use of backhoe and/or crane, shall consist of stone blocks, and shall be dense, durable, and hard material free from cracks, seams, and other defects which would tend to increase deterioration from handling and natural causes.  Originally, the weir consisted of 1,980 cubic yards of heavy riprap fill.  Once completed, the weir will have an approximately 20-foot-wide top area of riprap at elevation 74.0' with side slopes of 4:1.  The length of the weir restoration area will be approximately 160 linear feet.  An existing roadway will be maintained such that dump trucks will be able to deliver rocks to the location.  The applicant states that the weir will insure adequate levels at upstream pump stations during periods of low flow.  If the weir is restored to its original elevation, the applicant states that they would realize a reduction in pump lift of 1.5 feet.  Since the normal lift at this station is about 34 feet, restoring the weir would result in about 4½ percent power cost savings operating the pumps, with the same savings realized upstream at the Hidalgo County Water Improvement District No. 3 pumps as well.