A REVIEW

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A REVIEW Rio Grande leakage method used above
Bernardo

• GIS map of riverside drains and River
• Descritize map area
• Retrieve river area in each cell
• Retrieve river length in each cell
• Compute 2 to 3 river to drain distances for each
  cell and average distances
• Estimate river and drain water surface elevations
  for each cell
• Compute and average gradients from the river to
  the drain for each cell
• Calibrate leakage for a selected river reach

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Gross river leakage depends on

• Hydraulic gradients of river and drains
• River and drain water-surface elevations
• Hydraulic gradient between the river and drains
• Hydraulic conductivity of aquifer sediments
  between the river and drains
• Wetted perimeter of the river channel

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Includes Three Reaches
Below Cochiti Dam to San Felipe (15 river miles)
San Felipe to Central Ave. (33 river miles)
Central Ave. to Bernardo (53 river miles)
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Recalculated River Leakage
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USBR gradient data used to verify that the
FORTRAN program was sensitive to gradient changes
and that calculated gradients were reasonable
USBR gradients were from a piezometer near the
river to a piezometer near the river side
drain. Calculated gradients were from the river
bank to the adjacent river side drain
bank distance from river to drain were estimated
from ARC/INFO coverages. River surface
elevation estimated using river gradients and
distance of cell from upstream gage Riverside
drain surface elevation estimated from (MRGCD)
bottom elevation and average monthly drain
depth
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USBR river leakage computed at the 5 sites using
depth of river ranging from 60 to 85 feet and
horizontal hydraulic conductivity obtained from
short-term aquifer tests. Assumes a fully
penetrating rivernot valid for this
application River leakage computed for 1 mile of
river for a fully penetrating river Unitized
leakage per mile by dividing by the depth of
river used at the siteleakage units are
cfs/mile/foot of river depth
Calculated river leakage was unitized for a day
that USBR estimated river leakage and compared
to USBR unitized leakage. Horizontal hydraulic
conductivity in the FORTRAN program was changed
to obtain a close daily match between USBR and
calculated river leakage.
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Hydraulic Conductivity used in estimating river
leakage, Cochiti to Bernardo
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River leakage is not available for days into the
future which is needed for use in the Water
Operations Model, it needs to be calculated on
the fly
Used step wise regression analysis to test known
hydrologic parameters in the Bosque that are
significant to river leakage River flow at the
upstream gage of the reach Bosque
evapotranspiration
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