Maintenance Problems - Flat Sanitary
Maintenance Problems - Flat Sanitary
(OP)
I am doing a road design serving about 65 acers zoned office/lab. The property falls away from the road it fronts on. I designed the sanitary as a 12" to take advantage of a flatter minimum slope (0.22% rather than 0.44% for an 8")to extend sanitary as far as possible into the acerage with gravity . This concept was checked with the reveiwing agency at the beginning, everybody said the idea was acceptable. After full design and a very lengthy reveiw process we were notified of approval and were asked to provide several sets of drawings for them to stamp approved. Apparaently someone else looked them over and has a problem with the 12" at 0.22%. They are concerned with maintenance problems. This property could potentially have employment for 250 to 300 people. The sanitary I am tying into is a 12" @ 0.22% and we are at the upstream end so I am not clear why this is an issue. Any idea how to address their concerns and allow this to proceed?





RE: Maintenance Problems - Flat Sanitary
RE: Maintenance Problems - Flat Sanitary
If you meet the standards, point them out to the reviewing agency. The reviewing agency will not argue against their own standards.
RE: Maintenance Problems - Flat Sanitary
RE: Maintenance Problems - Flat Sanitary
Per:http://ww
Offices (per employee)10gpcd*300cap/day=3000gpd*4PF=0.0186cfs
Qfof 12"" @ .0022=1.67cfs
Q/Qf=2.13
d/D (approx):0.05
Vf of 12"" @ .0022=2.13fps
v 0.1065fps
Engineering is the practice of the art of science - Steve
RE: Maintenance Problems - Flat Sanitary
As bimr said, since your design meets the minimum slope requirement, they have no justification for not approving the plan.
RE: Maintenance Problems - Flat Sanitary
RE: Maintenance Problems - Flat Sanitary
The passage undeer that heading at least once read, "The pipe diameter and slope shall be selected to minimize settling problems. Oversize sewers will not be approved to justify using flatter slopes. If the proposed slope is less than the smallest pipe which can accomodate the design peak hourly flow, the actual depths and velocities at minimum, average, and design maximum day and peak hourly flow for each design section of the sewer shall be calculated by the design engineer and be included with the plans." [Notice the second sentence in the quotation that is literally quite restrictive -- in the context of this standard, I think when they say "oversize" they are talking about going larger than the "Minimum Size" of mainline sewer that was "8 inch" stated prior to the quoted passage in that same standard.]
RE: Maintenance Problems - Flat Sanitary
RE: Maintenance Problems - Flat Sanitary