HomeMy WebLinkAboutSewer Report Sewer System Report
for
Castlegate II Subdivision
College Station, Texas
Section 206 —November 2014
Prepared By:
SCHULTZ ENGINEERING, LLC.
TBPE Firm Registration No. 12327
2730 Longmire, Suite A
College Station, Texas 77845 40.1/' rsett
979.764.3900
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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, 204, 205, 100, 101, 102, 103, 104 and 105 have been
completed or are under construction. Section 206 is unchanged from the Preliminary
Plat and will add 52 new lots.
The tract of land that comprises this Section and Section 207 lies across a drainage
divide that cannot be crossed using gravity lines. As a result, a lift station is being
installed in this section to serve all of Sections 206 and 207. The force main from this
development will empty into one of the trunk lines that serve much of the rest of the
development.
As noted in Exhibit C, 60 lots have been added at Manhole 1303 for development of
the adjacent property.
Design Criteria:
Primary Sewer Outfall: Section 206-8"sewer line to a proposed lift station.
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 206 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 in sections 206 & 207 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 sewer line designs in section 207. The system 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.
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EXHIBIT A
OVERALL SEWER SYSTEM LAYOUT