Well A2 data

The PVC mat penetration device, Well A2 at Sta. A2, is located east of the open water ponds restoration site at Na Pohaku o Hauwahine. The vegetation in this area is dominated by maile pilau, para grass, and small, disconnected patches of cattail.

The following legend applies to the graph above:
Blue line is height of water above the "solid" bottom; green line represents "top of mat" calculated from tape reading from solid bottom to pipe lip; because the mat is apparently fixed to the deeper mud layer, no "bottom of mat" can be represented.
Sta. GPS:
Date installed:
Pipe length:
Ext. above mat:
Mat thickness:
Under mat:
Sep. 11, 2002

0.96 ft.

mud
DISCUSSION Station A2 is in an area generally very similar to Station A1, just further into the marsh. This is an area described as a "wet meadow" where it is believed the vegetation is growing not on floating mat (that is, a mat that separates from the underlying mud layer when water level rises in the marsh), but on sediment deposits. The sub-surface investigation reveals a peaty-muck comprising the marsh surface here.

This well does not exactly follow the "Standard Wet Meadow Model" (see Well A1). The rainfall event on October 15 (essentially the end of the dry season) produced a rise in the aquifer here of 1 foot with an accompanying rise in the mat surface of 6 inches. It is not known if the sudden rise in the mat represents expansion of the peat or an injection of water or mud slurry beneath the mat. However, to date there is no evidence of a layer of water beneath this station. Subsequently, the marsh surface remained relatively stable, suggesting this location generally fits the wet meadow model. Additional sub-surface investigations may reveal more about any differences between this location and Station A1.

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