EAGLE RIVER FLATS FY 00
26
last fall allowed the lowering of the water
and a location for a tide gate chosen. Accord-
level in Pond 146, exposing more of the highly
ing to Weldin, the ditch advanced as much as
contaminated sediments in the vicinity of
6 m in one flooding cycle this season. Pond
Canoe Point and the bird tower as well as
730 rarely escapes the monthly high tides now.
decreasing the cycling of System 3 in Pond
Further deepening of the sump at Pond 730
146 (Fig. III-1-4).
should reduce the cycling of the system and
Pond 730 remains problematic. Reblasting
the consumption of fuel, but remediation of
the Pond 730 sump in 1999 probably had a
this area will remain marginal until the Bread
much smaller effect on pump performance
Truck ditch is addressed.
than in Pond 146 because of poor placement
All areas experienced some drying. Area A
of the charges. The additional blasting done
dried more completely than in 1999, with cracks
this spring drained the affected areas more
appearing throughout the affected pond ar-
efficiently and allowed us to address addi-
eas. As mentioned, Pond 146, including
tional adjacent areas, such as the marsh in
Clunie Inlet, dried to a much larger extent
Area C and the Pond 75 complex in Area C/
than in 1999. Pond 183 was so dry during the
D and Coastal West. The frequent inunda-
latter part of June that the sensors topped out
tions from flooding tides through the Bread
again. Pond 155 dried somewhat, and Pond
Truck ditch into Pond 109 and then into por-
730 saw only marginal drying. Again, we
tions of Area C/D negate much of the drying
should emphasize that although a maximum
that might otherwise occur. The lowered
dry period of only 20 days was predicted be-
threshold caused by the ditch allows flood-
cause of flooding tides, we were able to
ing by only moderately high tides that nor-
achieve more than 50 contiguous days with-
mally would not have flooded the area.
out widespread flooding (Fig. III15). Rains
Installing a large "tide gate" in the Bread
starting in early July greatly reduced the ef-
Truck ditch has been discussed with JoAnn
fectiveness of the remediation method for the
Walls, Bill Gossweiler, and Terry Edwards of
remainder of the season, but it was a very suc-
Weldin. The area was surveyed this August
cessful season all the same (Fig. III16).
Figure III-1-4. Pond 146 off Canoe Point. Note the vegetation in the previously ponded area.
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