HomeMy WebLinkAbout1075 Pennock Pl - Correspondence/Water and or Sewer - 05/30/1985COLUMBINE6671 Wolff Court. Suite 220
1 Engineering Management Group, Inc. Westminster, Colorado 60030
Consulting Civil Engineers (303) 430-1921
and land Surveyors
Riverside Shopping Center May 30, 1985
Fort Collins, Colorado P.N. 113.20
Bonnie J. Tripoli, Development Coordinator
City of Fort Collins, Community Development Department
300 LaPorte Avenue, P.O. Box 580
Fort Collins, Colorado 80522
RE: Sanitary Sewer Services, Riverside Shopping Center
Dear Bonnie:
The purpose of this letter is to verify that four inch (4") PVC sanitary sewer
service lines, at a slope of one percent (I%), at the location shown on our
construction plans will be adequate to achieve the self -scouring velocities typically
required.
Our calculations are as follows:
V = 1.486 R2/3 S 1 /2
n
(Manning's Formula, flowing full)
where: V = velocity, in feet per second
n = Manning's Roughness Coefficent
= 0.010
(PVC)'
R = D/4 =
(4/ 12)/4 = 0.0833
S = slope,
in feet per second
= 1.0%
V = 1- 6
(0.0833)2 /3 (0.01)112
0.
V = 2.83 feet per second
Riverside Shopping Center P.N. 113.20
Bonnie J. Tripoli Page 2
Since a velocity of 2.83 fps is greater than the 2.0 fps typically required as a
minimum velocity to achieve a self -scouring condition, the 4" sanitary sewer service
lines at 1.0% should function satisfactorily.
If you have any questions regarding our calculations, please feel free to call me.
Sincerely, A
Ay,xe4
Michael D. Middleton, P.E.
President
MDM/nm
cc: Martin D. Brown - CDB Development Company
Ron Schuchman - Albertsons, Inc.
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