DESCRIPTION
The 36" culvert present at MP 18.3
has separated about 40 feet from the inlet and caused a local fill slope
failure. The risk to this site of continued failure of the slope could trigger
a slide to the Sitkum River, which can be seen from the road at that culvert.
If this pipe fails due to it's deteriorated condition there is direct delivery
potential to the river below.
The culvert is also undersized in proportion to
the bankfull width of the streams, and does not allow normal transport of wood
and sediment, and lacks capacity at flood flows. The expected trends on the Olympic Peninsula
due to climate change include increased winter precipitation and increased
flood frequency and magnitude from intensified heavy rain events (Halofsky et
al. 2011). In present condition, the
site is vulnerable to expected increases in flow associated with climate
change.
The 36" culvert present at MP 18.3 has separated about 40 feet from the inlet and caused a local fill slope failure. The risk to this site of continued failure of the slope could trigger a slide to the Sitkum River, which can be seen from the road at that culvert. If this pipe fails due to it's deteriorated condition there is direct delivery potential to the river below. The culvert is also undersized in proportion to the bankfull width of the streams, and does not allow normal transport of wood and sediment, and lacks capacity at flood flows. The expected trends on the Olympic Peninsula due to climate change include increased winter precipitation and increased flood frequency and magnitude from intensified heavy rain events (Halofsky et al. 2011). In present condition, the site is vulnerable to expected increases in flow associated with climate change.