HomeMy WebLinkAbout09-00100066- 00076441Sewer System Report
for
Castle Rock Subdivision
Phase 4
College Station, Texas
November, 2009
Prepared By.
HARLE ENGINEERING COMPANY
TBPE Firm Registration No. 4538
3002 Texas Avenue South
College Station, Texas 77845
979.693.7191
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General Information
Location: The Castle Rock Subdivision, Phase 4, Lots 32 -55, Block 2 and Lots 34-
35, Block 3 is located adjacent to the existing Phases IA, 2A, and 2B, the
Castle Rock Park and future development area.
General Note: These 26 residential lots will flow into the proposed 6" sewer lines which
will be constructed with this development. These sewer lines will
connect to an existing manhole on the 21" sewer line.
Land Use: Single Family Residential
Design Criteria
Primary Sewer Outfall. An existing 21" sewer line through this subdivision which was
constructed for the Castlegate Subdivision.
Domestic Demand:
Avg. Pop Density: 2.67 persons per unit
Average Flow: 100 gpd /cap Residential
Peaking Factor: 4
Pipe: PVC D3034 SDR 26
Applicable Exhibits: Exhibit A — Sanitary Sewer System Schematic
Exhibit B — Sanitary Sewer Analysis Spreadsheet
Conclusion
The proposed 6" lines flow into an existing 21 " line previously
constructed that was designed for the flow from this development. The
analysis in Exhibit B checks the calculated slope required to pass the
estimated flow against the design slope shown on the plans. The
spreadsheet indicates the design slope is greater than the minimum
computed slope, so we conclude that the system is more than capable of
carrying the anticipated flows from the subdivision.
Exhibit B also shows the full flow velocity in the proposed lines to be
2.94 and 3.07 fps and the calculated peak flow velocity to range from
1.42 fps to 1.85 fps.
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