Re: Navy sinking too many old warships?

Andrew C. Toppan wrote:
On Sun, 11 Mar 2007 07:26:46 +0100, "dott.Piergiorgio" <dott.piergiorgioHIRYU@xxxxxxxxxxxxxxxxxx> wrote:

The bottom of the Potomac river is rocky or muddy ? Barry, being a Forrest Sherman class ship, is steam-powered (=condenser issue) albeit can have reached Was NY by tug..

Mud.

BARRY was surely towed.



Can't say for the USS Barry, but the bottom of the Potomac at Washington is Rock down to the junction with the Anacostia

Take a rock hook if you sail there, Washington is on the Fall line


" When Virginia rivers flow eastward from the Piedmont onto the Coastal
Plain, they leave a zone where the riverbottom is hard rock and
encounter easier-to-erode Coastal Plain sediments. The energy of the
water carves a deeper channel in the softer sediments, creating
waterfalls. The edge of the Piedmont/Coastal Plain is marked by a line
of waterfalls (the Fall Line) where various rivers move from harder to
softer bedrock. The waterfalls are most obvious at Great Falls on the
Potomac River, on the Rappahannock River at Fredericksburg (look
westward from the I-95 bridge), and on the James River near downtown
Richmond (look westward from the Lee Bridge). The waterfall on the
Occoquan River near Lorton has been "dried out" by the construction of a
dam, trapping the water in the Occoquan Reservoir, but you can see the
exposed rocks at the Fall Line by walking upstream from the town of
Occoquan.

The Fall Line is a zone - sometimes several miles wide, rather than
just a narrow line - between the Coastal Plain and the Piedmont
physiographic provinces. The bedrock in the Piedmont is the hard
crystalline rock that you can see at Great Falls on the Potomac River.
The eastern edge of that hard rock is downstream on Teddy Roosevelt
Island, at the end of I-66 where it crosses the Potomac River on the
Teddy Roosevelt Bridge (connecting Rosslyn with the District of Columbia
at the Kennedy Center). Great Falls is several miles upstream, showing
how the Potomac River has etched its way upstream and carved out Mather
Gorge in the crystalline bedrock."

http://www.virginiaplaces.org/regions/fallshape.html

The transition just below the fall line is still rocky although the aquia creek type sandstone is nowhere near as Hard as the rocks of great falls.


Vince

.

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