I have an existing concrete lined trapezoidal channel (2'wide at bottom, 8'wide at top, 2' deep) that drains about 90 acres (Q~150cfs) and is sloped at 5%. All of this equates to a velocity of over 20 fps entering into a 48" dia. culvert. The concrete channel from the culvert to about 60 feet...
bltseattle,
As I stated earlier, this disagreement did not start just because I chose to be picky about this particular project. The engineer brought the scrutiny onto himself by submitting design calculations that were incomplete, but more importantly, clearly showed me that the pipes that he...
Just to show you how backwards we are, in 1998 the stormwater utility paid to have a stormwater manual prepared. I have a copy of it on my shelf. The manual and revised ordinance were presented to council for a vote and was denied because 1 developer and 1 engineer (obviously with some pull)...
ngneer, dicksewerrat,
I feel the need to respond to your questions concerning my need to justify and explain my position. I am relatively new to a municipal government of a city of 120K residents that: 1. Has had no City Engineer for the better part of ten years, 2. Has never had any form of...
KRS, Yes I am a municipal engineer, I am an EI five years out of college, I work with a handfull of PE's and I normally do not delve this deeply into a review(at least without reason). I started digging a little deeper into this after a cursory review of the calculations that were submitted...
Thanks for your input.
The engineer is using the rational method to determine the runoff for each individual catch basin, therefore I do not have any problem with the use of the Rational method. I would not necessarily have as much of a either problem using a composite C value for each...
I am reviewing plans submitted by an engineer for a section of a residential subdivision. The development is roughly 5 units per acre in an area that is generally very sandy. The engineer used a "composite" C-value of 0.3 to determine the Q for each inlet. In my experience, the C-value tables...
I realize there are many possible factors that can affect the costs, but I need to know, roughly, how much a sheet pile retaining wall might cost. I am looking at roughly 500lf along a creek bank. The hight may vary from 5' above grade to 3' above grade. I do not anticipate have to anchor the...
I am very familiar with the cons against using asphalt c&G as opposed to concrete. I have spoken my piece on that to the planning department on several occasions and expressed my opposition to "lowering" the standard. As suggested by KRS, this is definitely developer driven. This...
The municipality that I work for is considering the possibility of changing our development standards to allow the use of asphalt wedge curbing instead of concrete C&G. While this is definitely not my recommendation, I have been assigned the task of locating any studies that may have been done...
