07-31-2010, 01:27 AM
On the very new geology of Puna, each storm event can cause vastly different flood responses.
The deeper 'gulches' (not true gulches, in geologic formation terms) can accommodate some extra flow, but with the flow events like those floods, they have also overflowed in the past.
Even without human induced changes, flood response is varied, add all of the human induced changes, the reposes vary even more... (even the increase of lot ripping over the last decade can drastically change flood response of this very young geology)
Some of the past threads on the flooding at those two areas
from 2008, with koi at at Pohaku:
http://www.punaweb.org/Forum/topic.asp?TOPIC_ID=4975
and always a winner, Hazens tale from a bit farther back:
http://www.punaweb.org/Forum/topic.asp?TOPIC_ID=2225
The deeper 'gulches' (not true gulches, in geologic formation terms) can accommodate some extra flow, but with the flow events like those floods, they have also overflowed in the past.
Even without human induced changes, flood response is varied, add all of the human induced changes, the reposes vary even more... (even the increase of lot ripping over the last decade can drastically change flood response of this very young geology)
Some of the past threads on the flooding at those two areas
from 2008, with koi at at Pohaku:
http://www.punaweb.org/Forum/topic.asp?TOPIC_ID=4975
and always a winner, Hazens tale from a bit farther back:
http://www.punaweb.org/Forum/topic.asp?TOPIC_ID=2225