Blog - LEO - posts for May 2015

Leaking ports sealed

The irrigation events on LEO-C and LEO-W on 2/10/15 revealed that water leaked from several of the port holes in the base of the structure.  On LEO-C leaks were observed at port holes at x=2, 4, 6, 8, 10, 14, 16 and y=0.  Leaks were also observed at x=6, y= -1 and +1.  On LEO-W leaks were observed at x=2, 4, 6, 8, 10, 12, 16 and y=0.  To correct these leaks small holes were drilled into the acrylic tubing where sensor cables span out of the slope.  Dural 2-part low viscosity epoxy was injected through the hole to fill air space within the tubing, and hopefully provide a perfect seal.  The rain event on 4/29/2015 on LEO-C and LEO-W generated a water table that covered most of these locations, and no leaks were observed.  We preemptively performed the same sealing operation on ports at x=2, 4, 6, 8, 10, 12, 14 and y=-2 and +2 on LEO-C and LEO-W, in anticipation that the water table may regularly expand to that extent.

Attempted repair of seepage basin leak

On LEO-C there is a leak somewhere near the seepage trough near the y=0 coordinate.  The drip can be seen from the south side of the steel structure.  The exact source of the leak could not be determined.  Epoxy sealant was applied within the drainage basin immediately above the observed drip, in areas where there was standing water around the drainage hole.  This did not stop the leak.  The leak rate appears similar to, or greater, than the amount of water actually seeping from the gravel into the y=-1 portion of the seepage trough.  Based on that observation the leak may source from a location slightly upslope of the trough.  All seepage data on LEO-C prior to this time will be inaccurate because of this leak.  For the short term, we have placed two 208 L barrels under the drip locations, and will equip the barrels with HOBO water level loggers to monitor the leak rate, which will allow us to correct the time series of seepage from the landscape.

Tipping buckets maintenanced

On May 8th, 2015, tipping buckets -2, -1, 1, and 2 on LEO-C were disconnected from their respective portions of the seepage trough for maintenance.  Data will drop to zero for all tipping buckets during this time, followed later by an ascent from zero to some level of flow.

Tipping bucket maintenanced

On May 7th the tipping bucket associated with y= - 1 on LEO-C was disconnected from the seepage drainage basin during repair.  The data during this time will show a rapid decline to zero, followed later by a rapid ascent from zero to some level of flow.

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