HomeMy WebLinkAboutSewer Report Sewer System Report
for
Castlegate II Subdivision
College Station, Texas
Prepared by Phillips Engineering
Original Report - Section 200 - February 2011
Section 201 - December 2011
Section 202 - June 2012
Prepared by Schultz Engineering
Section 100-November 2012
Section 101 -April 2013
Section 102 -July 2013
Section 203 -August 2013
Section 103 -August 2013
Section 204-August 2013
Section 205-October 2013
Section 104-November 2013
Section 105 -July 2014
Section 106-February 2015
Prepared By:
Schultz Engineering, LLC
TBPE Firm Registration No. 12327
2730 Longmire, Suite A
College Station, Texas 77845 OF r
979.764.3900 jam* *
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JOSEPH P. ScHUL"2
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SCHULTZ ENGINEERING. LLC.
GENERAL INFORMATION
The Castlegate II Subdivision is a 202-acre residential subdivision being developed immediately
southwest of the existing Castlegate Subdivision in College Station. The approved Preliminary Plat
shows a total of 645 lots in the whole development. Sections 200, 201, 202, 203, 205, 100, 101, 103, 104,
and 105 have been completed or are under construction. Section 106 is unchanged from the Preliminary
Plat and will add 44 new lots.
The tract of land that comprises this subdivision lies across a drainage divide that cannot be crossed using
gravity lines. As a result, a lift station is being planned in a later phase of the development. The force
main from this development will empty into one of the trunk lines that serve much of the rest of the
development. On the spreadsheet shown in Exhibit C, the force main is shown as a 12" gravity line for
computational purposes. Sewer line S-12 along Kinnersley Court is being extended to the adjacent
property to provide sewer service to the property. 105 Lots have been assumed to be developed on the
adjacent property and included in this analysis.
Design Criteria:
Primary Sewer Outfall: Section 106- 8"sewer line at existing terminus of Kinnersley Court and a 6"
sewer line at existing terminus of Hailes Court both constructed with Section
101.
Domestic Demand:
Avg. Pop Density: 2.67 people per lot
Average Flow: 100 gpd/cap or 267 gpd per lot
Peaking Factor: 4
Pipe: PVC D3034 SDR 26
Applicable Exhibits: Exhibit A—Overall Sewer System Layout
Exhibit B—Section 106 Sewer System Layout
Exhibit C—Sanitary Sewer Analysis Spreadsheet
Conclusion:
The sewer system shown in Exhibit A has been laid out using the criteria in the Bryan/College Station
Design Guidelines and TCEQ. It is analyzed assuming peak flow conditions when the subdivision is
fully developed. The spreadsheet in Exhibit C shows all lines depicted in Exhibit B to be capable of
carrying the flows that come to them under these conditions. This analysis will be used as the basis for
all subsequent sewer line designs in the subdivision. The systepm will function as intended as long as
the line sizes and slopes are equal to or greater than those shown herein. It should be noted that any
significant additional flow from off-site sources will likely exceed the capacity of several lines, so
careful study is advised of any changes to the contributing area.
2
EXHIBIT A
OVERALL SEWER SYSTEM LAYOUT
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EXHIBIT
EXHIBIT B
SECTION 106 SEWER SYSTEM LAYOUT
EXHIBIT C
SANITARY SEWER ANALYSIS SPREADSHEET