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Hamilton Pool Rostaration, 2012 OCEA
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Hamilton Pool is a natural swimming pool which has been a landmark natural feature in the Texas Hill Country and Austin area for centuries. In 2007, Hamilton Pool and its sources – Hamilton and Davis Creeks – were inundated with silt which had run off from an upstream residential development. To restore water quality, Espey Consultants was requisitioned to remove over 7,500 cubic yards of silt from the pool and contributing creek system. As Dr. Victoria Harkins PhD PE, Project Manager for the restoration, put it, “We are undoing years of sedimentation and silt that occurred in one summer.” Dr. Harkins recommended and implemented a restoration plan which included a combination of water jetting and slurry extraction and a filtration system which was able to remove up to nine feet of silt from the bottom surface of Hamilton Pool.

 

During the restoration process, commercial underwater dive teams were contracted to suction the silt deposits, which were then pumped to a barge and up a 3,100 ft. cliff to a network of mix and filtration tanks. Once the water had been filtered, it was pumped back into Hamilton Creek, leaving both the creek system and the pool sediment free. Water clarity improved (from less than a meter to more than four meters) in less than a week. This outstandingfeat of engineering was completed on time and approximately $100,000 under budget.


Owner: 
Travis County
Engineer/Contractor: 
Harkins Engineering Inc.
Photo:
 Eric in SF - Wikimedia, CC License unchanged file

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