HomeMy WebLinkAboutSewer ReportSewer System Report
for
Castle Rock Subdivision
Phase 5
College Station, Texas
February, 2010
Prepared By:
HARLE ENGINEERING COMPANY
TBPE Firm Registration No. 4538
3002 Texas Avenue South
College Station, Texas 77845
979.693.7191
General Information
Location: The Castle Rock Subdivision, Phase 5, Lots 26 -34, Block 1, Lots 16-
133, Block 3 and Lots 17 -18, Block 4 is located adjacent to the existing
Phases 2A and 4 and future phases 6 and 7.
General Note: These 29 residential lots will flow into the proposed 8" and 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 Layout
Exhibit B — Sanitary Sewer Analysis Spreadsheet
Conclusion
The proposed 8" and 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 this phase and future phases of the
subdivision.
Exhibit B also shows the full flow velocity in the proposed lines to range
from 2.15 fps to 3.13 fps and the calculated peak flow velocity to range
from 0.71 fps to 2.10 fps.
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