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HomeMy WebLinkAboutWastewater Design ReportMarch 16, 2011 Mr. Alan Gibbs Planning and Development Services City of College Station 1101 Texas Avenue College Station, Texas 77842 Re: Wastewater Design Report Pi Beta Phi Sorority House Renovations & Addition 1601 Munson Avenue College Station, Texas Gessner Engineering Job No.: 11-0077 Dear Mr. Gibbs: The peak wastewater flow was calculated in accordance with the B/CS Unified Design Guidelines for Sanitary Sewer for the Pi Beta "Phi Sorority House Addition. The average demand values were determined using Method 9 — Fixture Count Determination. The Fixture Count for the Addition & Renovations was found to be 27. A value of 50.3 gallons per minute (gpm) was calculated for the peak wastewater demand. Based on a 16 hour/ day usage, the peak wastewater flow is calculated as 48,288 gallons/ day. Using the Manning equation with an n value of 0.013, the velocity of the proposed sewer line was calculated as shown in Table One below. Pipe Pipe Pipe Full Pipe Pipe Velocity (ft/s) Section Size (in) Slope (%) Capacity (50.3 gpm flow) (CIPM) Bldg Tie-in 4 ::L1,-5—T 134.64 3.20 Table One: Pipe Size, Slope and Velocity All pipe slopes are within the required range of minimum/maximum pipe slopes for sanitary sewer from the Bryan/College Station Unified Design Guidelines. NAGessner Eng Data 11\11-0077 Pi Phi Sorority House\Civil\DOC\l1.0077 Wastewater Design Report.doo Gessner Engineering 2501 Ashford Drive Suite 102 College Station, Texas 77840 P.O. Box 10763, 77842 979.680.8840 fax 979.680.8841 2204 S. Chappell Hill Street Brenham, Texas 77833 979.836.6855 fax 979.836.6847 Please contact us if you have any questions or if we can be of further assistance. Sincerely, GESSNER ENGINEERING, F-7451 00 Melissa P. Thomas P.E. * ' ......... � MELISSA P. THOMAS i1i.'% 98398 Jld GNAGessner Ena Data I1\11.0077 Pi Phi Snrnrily Flnnca\!`:.ril\illl!`\11_007? WflS[ W31P1 B261gn F@pag d'6 Gessner Engineering March 16, 2011 Mr. Alan Gibbs Planning and Development Services City of College Station 1101 Texas Avenue College Station, Texas 77842 Re: Letter Acknowledging City Standards Pi Beta Phi Sorority House Renovations & Addition 1601 Munson College Station, Texas Gessner Engineering Job No.: 11-0077 Dear Mr. Gibbs: The purpose of this letter is to acknowledge that the construction plans for the water, sanitary sewer, streets and drainage for the above -referenced project, to the best of my knowledge, do not deviate from the BJCS Design Guideline Manual. No alternate design or construction methodology was used. I also acknowledge to the best of my knowledge, that the details provided in the construction plans are in accordance with the Bryan/College Station Standard Details. Sincerely, GESSNER ENGINEERING, LLC F-7451 1111)aT Melissa P. Thomas, P.E. Morgan S. Lund, P.E. NL\Gessner'Eng Data lY\ll 0077 P;i Phi Sorou, H..u�8\Gtvil..O $1. ';002ZLeY�ee7AckC' Gessner Engineering 2501 Ashford Drive Suite 102 College Station, Texas 77840 P.O. Box 10763,77842 979.680.8840 fax 979.680.8841 2204 S. Chappell Hill Street Brenham, Texas 77833 979.836.6855 fax 979.836.6847