ST8804-CS 901011 GINN, INC. CONSULTING ENGINEERS
October !1 1990
,
Mr. Steve Goram
City of Coppell
P.O. Box 478
Coppell, TX 75019
Re: Heartz Road Sanitary Sewer from C.M.U.D. 24" Interceptor
to Sandy Lake Road
Dear Mr. Goram:
We have reviewed the plans for the proposed sanitary sewer
described above. Our review included a calculation of the
anticipated volume of sewage (including infiltration) which may
be carried by this line based partly on recent population
information developed by the City of Coppell Planning Department
for the Impact Fee Studies, and on the subdivision plans recently
reviewed by this office. The information furnished by the
C.M.U.D. No. 1 regarding this line dealt only with anticipated
probable costs of construction, not estimates of sewage flow
volumes.
The following table displays the calculations performed to
determine the approximate sewage flow quantities anticipated for
the subject sanitary sewer.
NCTCOG IACREAGEIRES. IAVr,. RES. INON- IAVG- NON'RES'IPEAK FLOUII/X ITOTAL I
FORECAST lin IPOP. ISEU. FLOU IRES. POP.ISEW. FLOU INOT INCL.I(6OOGPAD)IPEAK ]
DISTRICT IBASlN I IGAL/DAY I IGAL/DAY II/I (GPD)IGAL./DAY IFLOW (GPD)I
871 80 I 675 I 94,soo I 7,7s i 04,504 i 48,000 i s ,so,
ag~ I az I 175 I ~4,soo I 0 I 0 I 49,000 I 1),800 I &a,800
269 I 123 I 229 I 32,060 I 854 ! 29,036 I !22,!92 ) 73,80:,3 I 195,992
'zs?i ~4 I ?0 I 9.800 I 28a I 9.588 I ~8.?76 I 44,400 I 8~,~76
2901 ~ ll.0:~0 I 144.,'00 I 0 I o 1288o400 I 5o400 I z~,aoo
TOTALS I :~09 la,~?9 I ~05,0~0 I ~,~64 I 46,~7& I ?OZ,8?a I ~a5,400 I aaa,aza
* The population forecast for this district does not agree with
current zoning, therefore we have based the residential and
nonresidential populations on average densities for the
appt icabte zoning.
As can be seen above, our estimate of the Total Peak Flow for the
proposed sanitary sewer line is approximately 0.9 MGD. Our
review of the proposed sanitary sewer profiles indicates that the
line's maximum capacity, without surcharging, will be about 1.1
MGD.
17103 Preston Road · Suite 100 · LB 118 · Dallas, Texas 75248 · Phone 214/248-4900
Considering the current level of development and the proposed
land uses in this basin, we think it is reasonable to expect the
proposed sanitary sewer line to function adequately as designed.
Please call me if you have any questions.
Sincerely,
H. Wayne Ginn, P.E.
HWG/JCK/dsp
cc: Shohre Daneshmand, P.E.
File 90441