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HomeMy WebLinkAboutSewer System ReportSewer System Report for Castlegate II Subdivision College Station, Texas February 2011 Revised December 2011 Prepared By: Phillips Engineering 4490 Castlegate Drive College Station, Texas 77845 (979) 690 -3141 TPBE FIRM #13130 s y ,�P�(E . OF TFh t • "" , WW I' li • * i KENT M .... A 85823 .° ‘ 4 2P.1.4. gr i NA 0 lZ /2Z /l/ 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 629 lots in the whole development, but it is being modified to increase that figure to 645 lots. Section 200 was the initial phase and has now been completed, but will be replatted shortly to add 8 additional lots. The second phase will be Section 201 with 30 additional lots. Section 201 has changed alignments slightly from the initial submittal, but all new lots in both Sections have been accounted for in this revised analysis. 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 serves much of the rest of the development. On the spreadsheet shown in Exhibit B, the force main is shown as a 12" gravity line for computational purposes. Design Criteria: Primary Sewer Outfall: 12" sewer line at existing terminus of Victoria Avenue 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 — 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. It is analyzed assuming peak flow conditions when the subdivision is fully developed. The spreadsheet in Exhibit B shows all lines depicted in Exhibit A to be capable of carrying of 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 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. 1 ro n Na � diondri Limb gi umi fillumn - v,.u m ows Flow Calculations Pipe Calculations T e :° From To 0.' = td C w 3 arA o .. `" - r� Q aaA c e o a, Z 6 = z w w., o .. 3- a o 0 m g a d e a a a U /° Average Daily Flows (ADF) Infiltration (10% ADF) Peaking Facto eak Flows Size Materi Mannings n Manning Inside g Friction Slope Min. Design Slope Peak Flows Actual Slope for Existing Desi ned g Systems Pie or Sloe Check Peak Flow Depth p 267 450 GPD per GPD per Lot Acre MH # MH # 1200 GPD per Acre Diameter e r peak Flows Lots Acres 1226 1225 2 0 1225 1224 3 0 Acres 0 GPD 534 GPD .. GPD 534 CFS 0.0008 CFS 0.0001 4.00 CFS 0.003 (in.) Inches % % % Inches 1224 1223 4 0 0 801 534 1,335 0.0021 0.0002 4.00 0.008 6 D3034 0.013 5.793 0.346 0.80 0.80 OK 1223 1220 12 0 1,068 1,335 2,403 0.0037 0.0004 4.00 0.015 6 D3034 0.013 5.793 0.498 0.80 0.80 0.75 0 1222 1221 12 0 0 3,204 2,403 5,607 0.0087 0.0009 4.00 0.036 6 D3034 0.013 5.793 0.581 0.80 0.80 OK OK 0.89 1221 1220 6 0 3,204 - 3,204 0.0050 0.0005 4.00 0.020 6 D3034 0.013 5.793 0.488 0.80 0.80 1.23 0 1220 1210 0 0 0 1,602 3,204 4,806 0.0074 0.0007 4.00 0.030 6 D3034 0.013 5.793 0.544 0.80 0.80 OK OK 0.99 1210 1200 0 0 0 - 10,413 10,413 0.0161 0.0016 4.00 0.066 6 D3034 0.013 5.793 0.703 0.80 0.80 OK 1.16 1302 1301 6 0 0 - 10,413 10,413 0.0161 0.0016 4.00 0.066 6 D3034 0.013 5.793 0.703 0.80 0.80 OK 1.59 1301 1300 10 0 0 1,602 - 1,602 0.0025 0.0002 4.00 0.010 6 D3034 0.013 5.793 0.425 0.80 0.80 OK 1.59 1202 1201 10 0 0 2,670 1,602 4,272 0.0066 0.0007 4.00 0.027 6 D3034 0.013 5.793 0.520 0.80 0.80 OK 0.78 1201 1200 10 0 2,670 - 2,670 0.0041 0.0004 4.00 0.017 6 D3034 0.013 5.793 0.499 0.80 0.80 1.11 0 1102 1101 6 0 2,670 2,670 5,340 0.0083 0.0008 4.00 0.034 6 D3034 0.013 5.793 0.555 0.80 0.80 OK 0.92 0 1101 1100 10 0 0 1,602 - 1,602 0.0025 0.0002 4.00 0.010 6 D3034 0.013 5.793 0.425 0.80 0.80 OK 1.21 1300 1200 0 0 0 2,670 1,602 4,272 0.0066 0.0007 4.00 0.027 6 D3034 0.013 5.793 0.520 0.80 0.80 OK 0.78 1200 1100 0 0 0 - 4,272 4,272 0.0066 0.0007 4.00 0.027 8 D3034 0.013 7.754 0.237 0.40 0.40 OK 1.11 1100 1000 0 0 0 - 20,025 20,025 0.0310 0.0031 4.00 0.127 8 D3034 0.013 7.754 0.334 0.40 0.40 OK 1.25 900 840 0 0 0 - 24,297 24,297 0.0376 0.0038 4.00 0.154 8 D3034 0.013 7.754 0.335 0.40 0.40 OK 2.41 1000 900 0 0 0 - 24,297 24,297 0.0376 0.0038 4.00 0.154 12 D3034 0.013 11.538 0.615 0.25 1.00 OK 2.65 842 841 6 0 0 - 24,297 24,297 0.0376 0.0038 4.00 0.154 8 D3034 0.013 7.754 0.335 0.40 0.40 OK 2.04 841 840 10 0 0 1,602 - 1,602 0.0025 0.0002 4.00 0.010 6 D3034 0.013 5.793 0.525 0.80 1.25 OK 2.65 833 832 0 0 0 2,670 1,602 4,272 0.0066 0.0007 4.00 0.027 6 D3034 0.013 5.793 0.520 0.80 0.80 OK 0.74 832 831 8 0 0 0 0.0000 0.0000 4.00 0.000 8 D3034 0.013 7.754 0.000 0.40 1.25 OK 1.11 831 830 8 0 2,136 - 2,136 0.0033 0.0003 4.00 0.014 8 D3034 0.013 7.754 0.324 0.40 1.25 OK 0.78 822 821 6 0 0 2,136 2,136 4,272 0.0066 0.0007 4.00 0.027 8 D3034 0.013 7.754 0.754 0.40 1.50 OK 0.91 821 820 10 0 0 1,602 - 1,602 0.0025 0.0002 4.00 0.010 6 D3034 0.013 5.793 0.913 0.80 4.00 OK 1.02 813 812 0 0 0 2,670 1,602 4,272 0.0066 0.0007 4.00 0.027 6 D3034 0.013 5.793 2.282 0.80 4.00 OK 0.67 812 811 6 0 0 - - - 0.0000 0.0000 4.00 0.000 8 D3034 0.013 7.754 0.000 0.40 2.75 OK 0.82 811 810 10 0 0 1,602 - 1,602 0.0025 0.0002 4.00 0.010 8 D3034 0.013 7.754 0.261 0.40 2.75 OK 0.78 840 830 0 0 0 2,670 1,602 4,272 0.0066 0.0007 4.00 0.027 8 D3034 0.013 7.754 0.992 0.40 2.75 OK 0.84 830 820 0 0 0 0 - 28,569 28,569 0.0442 0.0044 4.00 0.181 12 D3034 0.013 11.538 0.193 0.25 0.25 OK 0.96 820 810 0 0 - 32,841 32,841 0.0508 0.0051 4.00 0.208 12 D3034 0.013 11.538 0.200 0.25 0.25 OK 2.89 810 800 0 0 0 - 37,113 37,113 0.0574 0.0057 4.00 0.235 12 D3034 0.013 11.538 0.220 0.25 0.25 OK 3.04 704 703 6 0 0 0 - 41,385 41,385 0.0640 0.0064 4.00 0.263 12 D3034 0.013 11.538 0.216 0.25 0.25 OK 3.20 703 702 12 0 1,602 - 1,602 0.0025 0.0002 4.00 0.010 8 D3034 0.013 7.754 0.142 0.40 0.40 OK 3.38 1 u' lO1 0 0 3,204 1,602 4,806 0.0074 0.0007 4.00 0.030 8 D3034 0.013 7.754 0.243 0.40 0.40 OK 0.95 u^ Z .5 701 700 0 0 0 1,335 4,806 6,141 0.0095 0.0010 4.00 0.039 8 D3034 0.013 7.754 0.252 0.40 0.40 OK 1.31 564 563 10 0 0 0 - 6,141 6,141 0.0095 0.0010 4.00 0.039 8 D3034 0.013 7.754 0.252 0.40 0.40 OK 1.44 563 562 14 0 2,670 - 2,670 0.0041 0.0004 4.00 0.017 6 D3034 0.013 5.793 0.861 0.80 1.50 OK 1.44 562 560 17 0 0 3,738 2,670 6,408 0.0099 0.0010 4.00 0.041 6 D3034 0.013 5.793 1.011 0.80 1.50 OK 0.83 561 560 16 0 0 0 4,539 6,408 10,947 0.0169 0.0017 4.00 0.069 6 D3034 0.013 5.793 0.706 0.80 0.80 OK 1.15 554 553 10 0 4,272 - 4,272 0.0066 0.0007 4.00 0.027 6 D3034 0.013 5.793 1.247 0.80 2.00 OK 1.63 553 552 14 0 0 0 2,670 - 2,670 0.0041 0.0004 4.00 0.017 6 D3034 0.013 5.793 0.861 0.80 1.50 OK 0.93 552 550 18 0 0 3,738 2,670 6,408 0.0099 0.0010 4.00 0.041 6 D3034 0.013 5.793 0.859 0.80 1.25 OK 0.83 551 550 15 0 0 4,806 6,408 11,214 0.0174 0.0017 4.00 0.071 6 D3034 0.013 5.793 0.793 0.80 0.90 OK 1.19 544 543 10 0 0 4,005 - 4,005 0.0062 0.0006 4.00 0.025 6 D3034 0.013 5.793 1.547 0.80 2.50 OK 1.61 543 542 14 0 0 2,670 - 2,670 0.0041 0.0004 4.00 0 6 D3034 0.013 5.793 0.979 0.80 1.75 OK 0.87 542 540 18 0 3,738 2,670 6,408 0.0099 0.0010 4.00 0.041 6 D3034 0.013 5.793 0.796 0.80 1.10 OK 0.81 541 540 14 0 0 4,806 6,408 11,214 0.0174 0.0017 4.00 0.071 6 D3034 0.013 5.793 0.871 0.80 1.00 OK 1.22 534 533 10 0 0 0 3,738 3,738 0.0058 0.0006 4.00 0.024 6 D3034 0.013 5.793 1.468 0.80 2.50 OK 1.57 533 532 14 0 0 2,670 - 2,670 0.0041 0.0004 4.00 0.017 6 D3034 0.013 5.793 1.089 0.80 2.00 OK 0.85 532 530 18 0 0 3,738 2,670 6,408 0.0099 0.0010 4.00 0.041 6 D3034 0.013 5.793 0.859 0.80 1.25 OK 0.80 531 530 14 0 0 4,806 6,408 11,214 0.0174 0.0017 4.00 0.071 6 D3034 0.013 5.793 0.890 0.80 1.10 OK 1.19 529 528 10 0 0 3,738 - 3,738 0.0058 0.0006 4.00 0.024 6 D3034 0.013 5.793 1.243 0.80 2.00 OK 1.54 528 527 14 0 0 2,670 - 2,670 0.0041 0.0004 4.00 0.017 6 D3034 0.013 5.793 1.089 0.80 2.00 OK 0.88 527 520 17 0 0 3,738 2,670 6,408 0.0099 0.0010 4.00 0.041 6 D3034 0.013 5.793 1.271 0.80 2.00 OK 0.80 526 525 14 0 0 4,539 6,408 10,947 0.0169 0.0017 4.00 0.069 6 D3034 0.013 5.793 0.818 0.80 1.00 OK 1.09 525 524 10 0 3,738 - 3,738 0.0058 0.0006 4.00 0.024 6 D3034 0.013 5.793 0.613 0.80 1.00 OK 1.56 524 523 7 0 0 0 2,670 3,738 6,408 0.0099 0.0010 4.00 0.041 6 D3034 0.013 5.793 1.011 0.80 1.50 OK 1.01 523 522 4 0 0 1,869 6,408 8,277 0.0128 0.0013 4.00 0.053 6 D3034 0.013 5.793 1.093 0.80 1.50 OK 1.15 522 521 10 0 0 1,068 8,277 9,345 0.0145 0.0014 4.00 0.059 6 D3034 0.013 5.793 0.786 0.80 1.00 OK 1.28 521 520 5 0 0 2,670 9,345 12,015 0.0186 0.0019 4.00 0.076 6 D3034 0.013 5.793 0.686 0.80 0.80 OK 1.46 560 550 0 0 0 1,335 12,015 13,350 0.0207 0.0021 4.00 0.085 6 D3034 0.013 5.793 0.661 0.80 0.80 OK 1.72 550 540 0 0 0 - 15,219 15,219 0.0235 0.0024 4.00 0.097 8 D3034 0.013 7.754 0.585 0.40 0.80 OK 1.82 540 530 0 0 0 - 30,438 30,438 0.0471 0.0047 4.00 0.193 8 D3034 0.013 7.754 0.649 0.40 0.80 OK 1.83 530 520 0 0 0 - 45,390 45,390 0.0702 0.0070 4.00 0.288 8 D3034 0.013 7.754 0.742 0.40 0.80 OK 2.51 520 510 0 0 0 - 60,342 60,342 0.0934 0.0093 4.00 0.383 8 D3034 0.013 7.754 0.945 0.40 1.00 OK 2.97 510 500 0 0 0 - 84,639. 84,639 0.1310 0.0131 4.00 0.537 12 D3034 0.013 11.538 0.658 0.25 0.80 OK 3.23 509 508 3 0 0 - 84,639 84,639 0.1310 0.0131 4.00 0.537 12 D3034 0.013 11.538 0.658 0.25 0.80 OK 3.65 508 507 2 0 0 801 - 801 0.0012 0.0001 4.00 0.005 6 D3034 0.013 5.793 0.213 0.80 0.80 OK 3.65 507 506 12 0 0 534 801 1,335 0.0021 0.0002 4.00 0.008 6 D3034 0.013 5.793 0.346 0.80 0.80 OK 0.68 506 505 10 0 0 3,204 2,670 1,335 4,539 0.0070 0.0007 4.00 0.029 8 D3034 0.013 7.754 0.240 0.40 0.40 OK 0.75 505 504 12 0 0 4,539 7,209 0.0112 0.0011 4.00 0.046 8 D3034 0.013 7.754 0.270 0.40 OK 1.28 11 4 t3 10 0 0 3,204 7,209 10,413 0.0161 0.0016 4.00 0.066 8 D3034 0.013 7.754 0.292 0.40 0.40 0.40 OK 1.53 r # 4 0 0 2,670 10,413 13,083 0.0202 0.0020 4.00 0.083 8 D3034 0.013 7.754 0.318 0.40 0.40 OK 1.80 4 p $t ; (1 - o 501 500 0 0 0 0 1,068 - 13,083 14,151 14,151 14,151 0.0219 0.0219 0.0022 0.0022 4.00 4.00 0.090 0.090 8 8 D3034 D3034 0.013 0.013 7.754 7.754 0.318 0.318 0.40 0.40 0.40 OK OK 1.97 2.03 247 246 16 0 246 245 4 0 0 0 - 4,272 14,151 - 14.151 4,272 0.0219 0.0066 0.0022 0.0007 4.00 4.00 0.090 0.027 8 6 D3034 D3034 0.013 0.013 7.754 5.793 0.318 0.520 0.40 0.80 0.40 0.40 OK OK 2.03 2.03 245 244 6 0 0 1,068 4,272 5,340 0.0083 0.0008 4.00 0.034 6 D3034 0.013 5.793 0.555 0.80 0.80 OK 1.11 244 243 6 0 0 1,602 5,340 6,942 0.0107 0.0011 4.00 0.044 6 D3034 0.013 5.793 0.585 0.80 0.80 OK 1.21 243 242 10 0 0 1,602 6,942 8,544 0.0132 0.0013 4.00 0.054 6 D3034 0.013 5.793 0.638 0.80 0.80 0.80 OK 1.36 242 241 12 0 0 2,670 8,544 11,214 0.0174 0.0017 4.00 0.071 8 D3034 0.013 7.754 0.364 0.40 0.50 OK 1.48 241 240 11 0 3,204 11,214 14,418 0.0223 0.0022 4.00 0.091 8 D3034 0.013 7.754 0.394 0.40 OK 1.77 222 221 14 0 0 0 2,937 14,418 17,355 0.0269 0.0027 4.00 0.110 8 D3034 0.013 7.754 0.436 0.40 0.50 OK 1.96 221 220 10 0 0 3,738 - 3,738 0.0058 0.0006 4.00 0.024 6 D3034 0.013 5.793 0.613 0.80 0.50 OK 2.11 261 ; 241 0 '4t s 0 i 0 210 200 0 0 0 0 0 0 2,670 267 801 534 534 3,738 - 17,622 18,423 25,365 6,408 267 18,423 18,957 25,899 0.0099 0.0004 0.0285 0.0293 0.0401 0.0010 0.0000 0.0029 0.0029 0.0040 4.00 4.00 4.00 4.00 4.00 0.041 0.002 0.117 0.120 0.164 6 6 8 D3034 D3034 D3034 0.013 0.013 0.013 5.793 5.793 7.754 2.119 0.041 0.343 0.80 0.80 0.40 1.00 3.50 1.50 0.40 OK OK 1.01 0.97 OK OK 0.60 2.29 8 8 D3034 D3034 0.013 0.013 7.754 7.754 0.340 0.343 0.40 0.40 0.40 OK 2.33 800 700 0 0 0 - 25,899 25,899 0.0401 0.0040 4.00 0.164 8 D3034 0.013 7.754 0.343 0.40 0.40 OK 2.71 700 600 0 0 0 - 41,385 41,385 0.0640 0.0064 4.00 0.263 12 D3034 0.013 11.538 0.216 0.25 0.40 OK 2.71 600 500 0 0 0 - 47,526 47,526 0.0735 0.0074 4.00 0.301 12 D3034 0.013 11.538 0.205 0.25 0.25 OK 3.38 500 300 0 0 0 - 47,526 47,526 0.0735 0.0074 4.00 0.301 12 D3034 0.013 11.538 0.205 0.25 0.25 OK 3.66 300 200 0 0 0 - 146,316 146,316 0.2264 0.0226 4.00 0.928 12 D3034 0.013 11.538 0.300 0.25 0.25 OK 3.66 200 100 0 0 0 - 146,316 146,316 0.2264 0.0226 4.00 0.928 12 D3034 0.013 11.538 0.300 0.25 0.30 OK 5.95 *Note: Shaded line segments have 172,215 172,215 0.2665 0.0266 4.00 1.092 12 D3034 0.013 11.538 0.943 0.25 0.30 OK 5.95 changed since the previous submittal. 1.00 OK 4.77 Li C Exhibit B Castlegate II Subdivision, Sections 100 -107 and 200 -207 Sewer System Analysis Spreadsheet