McDowell Mtn Park Sed traps--2_14_03

Rainfall


From Maricopa County Flood Control District.  Shows 5 day total (really 1-2 days of the storm across the valley). Source is:  http://156.42.96.39/xrainmaps.html .

Here is the rainfall data from the McDowell Mtn Park raingauge:  5915 McDowell Mtn. Park from  http://156.42.96.39/showrain.html :   Raw PPT data

 

Photographs--2_14_03 pm


MMPU3--~20 cm of water in it; about 1 cm of 
sediment in base. Evidence of some flow past the 
trap and that it was full of water.

MMPU3

MMPB1--~10 cm of water; ~2 cm of sediment
(pretty fine-grained).  Evidence of flow past
and over it.

MMPB2--Beautiful sand package moving toward
trap.  Evidence of flow past the trap, including 
erosion of excavated material from behind it.  ~25 cm
water; 4-5 cm sediment.

MMPB2

MMPB2

MMPB2

MMPB2

MMPB3--Full (2/3) of course sediments and 
woody debris.  Scoured around.  Clear flow past
the trap.  Also shows coarse over fine as sand 
wave moved into trap.

MMPB3

MMPB3

faint rainbow

MMPU2--6-10 cm of water; 1-2 cm of sediment. 
Has had ruoff thorugh and past it with complete 
filling evident.

MMPU2

MMPU5--
Sand package heading toward it about 2 m upstream. 
It looks like a small dam formed by vegetation just 
downstream from the trap caused more still water 
and accumulation of fines and leaf and wood debris. 
Could have had 10-20 cm of water above the top 
of the trap (indicated by jetsam).

MMPU5

MMPU5

MMPU5

MMPU4-->10 cm thick, channel wide coarse sand
has moved into the trap.  It has had 10-30 cm 
scour around its back. FLow has been > 10 cm 
above top of trap.  Excavated debris below has 
been removed in channel.

MMPU4

MMPU4

MMPU4

MMPU1--Entry is still very flush.  Flow and scour
down stream removed excavated debris. 20-30 cm 
water and 4->10 cm sediment, including some 
conical coarse sand accumulations on upstream 
center.

MMPU1

MMPU1

MMPU1

Pages maintained by Ramón Arrowsmith
February 16, 2003