PLEASE CLICK on photo to enlarge. Top image taken Dec. 25, 2007, to show progress at the same spot. Fortunately, little rain had fallen between August and Christmas, so the mud was building but staying put. Rain was predicted for Dec. 26!
Second image taken about 2:20 p.m. Saturday, after rain subsided. Lower image taken early Friday morning. Change in flow is apparent if you enlarge images. Were the amounts of rain each day recorded? Did holder of stormwater permit check the silt fence each day? According to ADEQ, the records are right there on site someplace. One would hope in a dry spot! Top photo added about 5:30 p.m. Saturday.
This silt fence appears to need reinforcement. It has collected lots of rock and sediment and is serving almost clean water over its top, because that is what is coming from uphill to the north. The muddy silt on the nearby surface has all been washed off, thanks to a lot of nice slow rain on September 6-7 and a powerful flash flood-level rainfall Tuesday evening.
However, a big burst of hard rain today or tonight may fill the space behind the fence with more rock and debris and finally stretch it past its limit. The culvert immediately downstream will likely get a bit clogged at that point and the storm drain to the south will be expected to transport the whole mess toward Spout Spring Branch in Walker Park and maybe even to the Town Branch of the West Fork of the White River and Beaver Lake.
I assume the contractor or developer isn't on site because he is busy writing his daily report on rainfall and the condition of his erosion-control devices.
In Razorback football talk, that photo might exemplify a bend/don't break defensive scheme.
Posts
No comments:
Post a Comment