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  • ​With 500-yr rainfall estimates easily having +/-25% uncertainty, estimates of 500-yr flood levels can often be even less reliable.  However, some floodplains have features--like the rim of a bucket--which can mean that there are small flood elevation differences for significant increases in extreme ...

  • It is not apparent from your post whether the majority of loss is through the embankment or due to the under-seepage.  Your dam seems to have both.  Assuming that the under-seepage is the key factor an apron or cutoff would seem appropriate.  The question you ask about low cost materials is obviously ...

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  • The National Reservoir Sedimentation and Sustainability Team is offering a free webinar series. The next 1-hour webinar is Thursday, April 26th  10:00 AM PDT  |  11:00 AM, MDT  |  12:00 PM, CDT |   Professor Rollin Hotchkiss (BYU) and David Olson (USACE) will present on  Permitting for reservoir ...

  • Hello! I don't have any more ideas but from what i understand, can't we use a different size of soil and compact it water tight along with impermeable membrane like plastic? I appreciate your suggestions.  Thank you ------------------------------ Mansi Master S.M.ASCE Jersey City NJ ------------- ...

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  • ​Certain kinds of clay material may be helpful in keeping the dam watertight - perhaps as a transitional layer between the bottom of the reservoir and up the internal face of the dam, despite the challenges of compaction and structural integrity for the dam structure. Maintaining water without infiltration ...

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  • You can also inject chemical grout, vertically into the soils, to stabilize and seal the dam. It may cost more but, will take a few days to install. Most poly-grouts have adhesive qualities and cure in 15 minutes. They behave like expanding soil epoxy. You can even pre-install soil nails to further stabilize ...

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