A)
770' 2"
771'8"
14 in. OD
Lateral
Main
749.15ft
3in Diameter
763.15ft
Lowest Floor Elev.=763.75ft
147ft
B)
763.15ft+1.16= 764.32
C)
D)
E)
3 in. sewer lateral
25 in frost depth
770.167'-2.083"=768.08
768.08-.25
f)
Inv. Elev. -Crown Elev. Main + 1/2(OD)
Distance building to Main
100%
763.15 -749.15 + 1/2(14)
147
100%
21
147
g)
As stated in P3005.3 Horizontal drainage piping slope of “IRC CHAPTER 26 GENERAL PLUMBING
REQUIREMENTS”:Horizontal drainage piping shall be installed in uniform
alignment at uniform slopes not less than 1/4 unit vertical in 12 units horizontal (2-percent slope) for 2
1/2 inch (64 mm) diameter and less, and not less than 1/8 unit vertical in 12 units horizontal (1percent slope) for diameters of 3 inches (76 mm) or more. Therefore, any slope that is greater than
2 percent, with given pipe diameter of 3in, is adequate for drainage as determined by the sizeing chart
(shown on the right) meaning that the calculated slope of ~14% is sufficient under code.
Conclusion Questions)
1)
A septic system would be appropriate when a residential space is unable to
connect to a larger waste management system (like a rural house)
2)
If possible, increasing the diameter of the pipe could be the first solution
allowing the waste to flow better. However, otherwise increase the
starting elevation of the branch would increase the slope helping to
meet requirements
3)
They help break down solid waste and other pollutants which prevent
effective wastewater treatment
4)
Effective wastewater treatment prevents the spread of diseases and
pathogens in society and limits harmful effects on ecosystems
100%
0.142857142857
100%
14.2857142857%