HomeMy WebLinkAboutSanitary Sewer Analysis❑ m � Kimley -Horn
and Associates, Inc.
Technical Memorandum
To: City of College Station
From: Michael J. Moore, P.E.
Date: April 19, 2010
Design Criteria
Results
•
TEL 979 846 8401
FAX 979 846 8450
PEE O ........ TF-i.
•
r MICHAEL J. MOORE
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•
f j9 ,. 68
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Subject: Greens Prairie Elemntary School
Sanitary Sewer Analysis
KHA P o ect'lo. 066077400
i CZ
Greens Prairie Elementary School is a new elementary school being development at
the comer of Greens Prairie Road and Royder in College Station, Texas. This
proposed development is located on approximately 46 acres. This technical
memorandum addresses sanitary sewer capacity for the proposed sanitary sewer
mains for the first phase of this development.
There is one sanitary sewer main proposed on the subject site. This sanitary sewer
main has been designed in accordance with the BCS Unified Design Guidelines and
City of College Station standard specifications. Flow calculations were performed
using Method 3 — Historical Data as provided by the College Station Independent
School District. The Historical Average Daily Flow was calculated using the total
water usage, excluding the months of June, July, and August to better represent the
water usage with full enrollment, of Cypress Grove Intermediate School as well as
Forest Ridge Elementary School. The irrigation usage was also subtracted, then
divided by the total number of days used to calculate flow in gallons per day (GPD).
We then calculated the Peak Daily Flow using a peaking factor of 4. The average
historic average daily flow was calculated by taking the historic daily flow for each
year and averaged them together per school. Capacities of the sanitary lines were
determined using Mannings formula for each segement between connections.
The attached spreadsheet shows the results of the capacity calculations for each
segement of the proposed line. This analysis indicates that all pipe sizes exceed the
capacity requirements for the flow in each segement. The minimum excess capacity
in the system is 0.479 MGD. All segements are at or above minimum slopes as
outlined in the design criteria.
•
Suite 105
111 University Drive East
College Station, Texas
77840
❑ , Kimley -Horn
and Associates, Inc.
Conclusion
The sanitary sewer mains for the proposed development exceed the minimum
requirements as described herein.
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Kimley -Horn
1 and Associates, Inc.
Technical Memorandum
To:
From:
Date:
Subject: Greens Prairie Elemntary School
Sanitary Sewer Analysis
KHA Project o. 066077400
rwl Cte
Greens Prairie Elementary School is a new elementary school being development at
the corner of Greens Prairie Road and Royder in College Station, Texas. This
proposed development is located on approximately 46 acres. This technical
memorandum addresses sanitary sewer capacity for the proposed sanitary sewer
mains for the first phase of this development.
Design Criteria
Results
•
TEL 979 846 8401
FAX 979 846 8450
City of College Station
Michael J. Moore, P.E.
April 19, 2010
j ee r a rlirleW%
5 • ..: •
MICHAEL J. MOORE
•
fro: .5)
68 _ �
0 , •.
I 94- G I
• ,S S .,,
„, /O
*',
There is one sanitary sewer main proposed on the subject site. This sanitary sewer
main has been designed in accordance with the BCS Unified Design Guidelines and
City of College Station standard specifications. Flow calculations were performed
using Method 3 — Historical Data as provided by the College Station Independent
School District. The Historical Average Daily Flow was calculated using the total
water usage, excluding the months of June, July, and August to better represent the
water usage with full enrollment, of Cypress Grove Intermediate School as well as
Forest Ridge Elementary School. The irrigation usage was also subtracted, then
divided by the total number of days used to calculate flow in gallons per day (GPD).
We then calculated the Peak Daily Flow using a peaking factor of 4. The average
historic average daily flow was calculated by taking the historic daily flow for each
year and averaged them together per school. Capacities of the sanitary lines were
determined using Mannings formula for each segement between connections.
The attached spreadsheet shows the results of the capacity calculations for each
segement of the proposed line. This analysis indicates that all pipe sizes exceed the
capacity requirements for the flow in each segement. The minimum excess capacity
in the system is 0.479 MGD. All segements are at or above minimum slopes as
outlined in the design criteria.
•
Suite 105
111 University Drive East
College Station, Texas
77840
p7 _ F1 Kimley -Horn
and Associates, Inc.
Conclusion
The sanitary sewer mains for the proposed development exceed the minimum
requirements as described herein.
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