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Citizens Advisory Committee Presentation Presentation CSO Long Term Control Plan Sewer System Baseline Conditions October 7, 2009 Outline Model development Software overview Model extents Model extents Design rainfall C


  1. Citizens Advisory Committee Presentation Presentation CSO Long Term Control Plan Sewer System Baseline Conditions October 7, 2009

  2. Outline � Model development – Software overview – Model extents Model extents – Design rainfall � C lib � Calibration ti � Baseline conditions

  3. Sewer Modeling Process � State-of-the-art EPA SWMM 5 software � Four models: Albany North, Albany South, Rensselaer, and Troy � Models based on sewer plans, GIS, and field inspections p � Calibrated to 2008 flow metering

  4. SWMM Process Models Evaporation / Precipitation Surface Runoff Infiltration Snow Buildup Washoff Channel, Pipe, & Groundwater Sanitary Flow Sanitary Flow St Storage Routing R ti Treatment / Treatment / RDII RDII Diversion

  5. SWMM Runoff Modeling

  6. SWMM Hydraulic Modeling

  7. Model components � Pipe hydraulics � Dry weather flow – Sanitary wastewater – Base infiltration � Runoff hydrology � Runoff hydrology – Combined drainage – Sanitary sewer infiltration/inflow S it i filt ti /i fl – Direct drainage connections

  8. Hydraulics � Modeled pipes � Modeled pipes – All CSO regulators – All interceptors – Principal trunk sewers � Pump stations, WWTPs, real-time controls � Hudson River stage boundary Hudson River stage boundary R l Rule Big_C_Regulator_2 Bi C R l t 2 If Node Scso_017R Depth = 2.58 Then Orifice Big_C_Gate Setting = 0.87

  9. Dry Weather Flow 2.5 2.0 � Average sanitary and baseflow 1.5 � Diurnal patterns 1.0 Jan Apr Jul Oct � Baseflow variation 1.5 3.5 1.0 3.0 0.5 2.5 0.0 12 AM 6 AM 12 PM 6 PM 12 AM 2.0 1.5 Sun 12 AM Sun 12 PM Mon 12 AM Mon 12 PM Tue 12 AM

  10. Hydrology � All areas tributary to ACSD-N, ACSD-S and RCSD WWTPs RCSD WWTPs � Dynamically simulate: – runoff to combined sewers – infiltration / inflow into sanitary sewers – upstream drainage entering sewer system

  11. Model Extents

  12. Sewersheds

  13. Albany North Model � 600 pipes � 68 catchments � 24 CSOs � 24 CSOs � 13 pump stations � Includes Patroons Creek Interceptor

  14. Albany South Model � 220 pipes � 30 catchments � 20 regulators � 12 CSOs � 12 CSOs � Tidal influence � Significant I/I below Big C

  15. ACSD Interceptor Profiles � Hudson River � Beaver Creek

  16. Rensselaer Model � 90 pipes � 17 catchments � 9 CSOs � 9 CSOs � Aiken, Forbes PS � CSOs to tidal zone � Considerable separation

  17. Troy Model � 470 pipes � 470 pipes � 100 catchments � 49 CSOs � 106 th , Monroe St. PS � CSOs above and below Federal Dam � Sanitary flows from Schaghticoke, Brunswick, and g , , North Greenbush

  18. RCSD Interceptor Profile

  19. Representative Period Selection � 5-year period for long-term CSO statistics – average precipitation – wet and dry years – storm depths and frequencies

  20. Average Annual Precipitation by Decade A A l P i it ti b D d 43 43 43 42 41 41 41 41 40 39 39 39 38 38 38 37 37 37 36 36 33 1830 1850 1870 1890 1910 1930 1950 1970 1990

  21. Annual Precipitation 1985-1989 Year Precipitation (inches) Percentile 1985 1985 30 0 30.0 13% 13% 1986 44.0 86% 1987 1987 39.3 39 3 68% 68% 1988 29.6 10% 1989 39.7 72% 5 ‐ year average 36.5 Long ‐ term mean 36.8

  22. Storm Depth Histograms 1985-1989 Year ≥ 0.25” ≥ 0.50” ≥ 0.75” ≥ 1.0” ≥ 1.5” ≥ 2.0” ≥ 2.5” 1985 33 20 12 6 2 0 0 1986 40 29 20 18 5 3 2 1987 1987 41 41 25 25 19 19 11 11 4 4 3 3 2 2 1988 33 20 13 7 1 1 1 1989 1989 44 44 27 27 19 19 12 12 6 6 1 1 0 0 5 ‐ year average 38 24 17 11 3.6 1.6 1.0 Long ‐ term mean L 41 41 24 24 15 15 8 8 3.4 3 4 1.3 1 3 0 7 0.7

  23. River Stage � Stage/discharge at Green Island � Stage/discharge at Green Island 22 20 18 16 Jan 07 Feb 07 Mar 07 Apr 07 May 07 Jun 07 � Albany tide gage � Albany tide gage 10 8 6 4 2 0 -2 2 Jan 07 Feb 07 Mar 07 Apr 07 May 07 Jun 07

  24. Calibration and Application � Calibration to summer 2008 flow metering � Models capable of running 5-year continuous simulations � Calibrated models provide robust annual statistics for each CSO – Volume – Duration – Frequency

  25. 2008 Metering Rainfall Date Rennselaer Troy y Cohoes Albany Airport y p June 6 1.9 2.3 2.2 1.9 1.8 20 June 16 1.3 1.1 1.2 1.0 1.4 18 July 13 y 0.7 0.8 1.2 0.8 1.1 16 July 23 2.6 2.9 2.7 2.8 3.5 July 27 1.1 0.4 0.6 0.4 0.2 14 August 2 g 1.2 0.7 1.4 0.4 0.1 12 12 August 7 1.8 0.4 0.1 1.8 0.1 10 August 11 3.0 1.5 1.4 1.0 1.5 September 6 p 1.6 1.4 1.4 1.3 8 8 6 4 2 0 Jun 6 Jul 6 Aug 5 Sep 4

  26. Calibration Methodology � Discharge volume � Timing of hydrographs � Peak flows � Water levels � Velocity � Velocity

  27. 2008 Metering Data � Flow metering � WWTP flow data � River stage above and below dam

  28. September 6, 2008 storm 0.4 0 4 Rennselaer 1 0.3 .22 .2 .19 0.2 .15 .14 .14 .13 .11 .1 .09 .09 0.1 .04 .02 .02 .01 01 .01 01 0.0 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Hours since 9/6 12 AM 0.4 Troy 2 Troy 2 0.3 .25 .16 0.2 .14 .14 .12 .11 .1 .1 .07 .06 0.1 .04 .03 .02 .01 .01 .01 .01 .01 0.0 0 0 0.4 Cohoes 3 0.3 .24 .2 0 2 0.2 .15 15 .15 15 .14 14 .1 .1 .09 .06 0.1 .05 .04 .04 .03 .02 .02 0.0 0 4 0.4 Albany Airport 0.3 .25 .16 .16 0.2 .13 .12 .08 .08 .06 .06 0.1 0 1 .05 05 .04 04 .04 04 .03 03 .02 .02 .01 .01 .01 .01 0.0

  29. Calibration Hydrographs

  30. All Storms Scatterplots Meter - ACSD_S-01 - Volume (MG) Meter - ACSD_S-01 - Peak Flow (MGD) 140 90 80 120 70 100 60 led led 80 50 50 Model Model 40 60 30 40 20 20 10 0 0 0 0 0 20 40 60 80 100 120 0 20 40 60 80 Measured Measured Meter - ACSD_S-01 - Max Depth (FT) Meter - ACSD_S-01 - Max Velocity (FPS) 5 18 4.5 16 4 14 3.5 12 led 3 ed Modele 10 10 Model 2.5 8 2 6 1.5 4 1 0.5 2 0 0 0 3.2 3.4 3.6 3.8 4 0 5 10 15 Measured Measured

  31. Baseline Conditions � CSO statistics by system � Most active CSOs � Community-specific issues

  32. Regional CSO City MG/year Buffalo Buffalo 4 000 4,000 Albany 1,251 Hartford 1,040 Syracuse 690 S Springfield i fi ld 630 630

  33. Albany Pool Annual CSO S System t MG/ MG/year Hours Events % Capture H E t % C t Albany North 30 380 61 91 Albany South 753 640 58 63 Rensselaer 20 190 52 88 Troy 448 720 65 67 Total 1251

  34. Albany North - Most Active CSOs Location Location SPDES Mgal Hours Events SPDES Mgal Hours Events Little C 008 8.6 30 11 7th Street 4.5 330 44 Mohawk Street 007 4.2 380 21 Swan Street 4.0 209 41 C Continental Ave i l A 005 005 2.9 2 9 23 23 11 11 Five CSOs active ≥ 40 events/year Five CSOs active ≥ 40 events/year

  35. System Issues: Albany North S t I Alb N th � Cohoes, Green Island, and Watervliet compete with separate sanitary contributors for Hudson River Interceptor capacity Ri I t t it � Capacity of 42-inch Cohoes Interceptor � 13 pump stations, some with capacity limitations � Multiple high frequency, low volume CSOs

  36. Most Active CSOs Most Active CSOs – Albany South Albany South Location Location SPDES Mgal Hours Events SPDES Mgal Hours Events Big C 017 547 513 48 Bouck k 013 94 637 58 Maiden/ Orange/ Steuben Steuben 029 029 48 48 496 496 56 56 Livingston/ Jackson/ Q Quackenbush 031 36 260 55 Division/ State/ Hudson 025 19 213 42

  37. System Issues: Albany South � Combined sewers serve 75% of ACSD-S area Combined sewers serve 75% of ACSD S area � Anecdotal evidence of widespread flooding � Two outfalls account for 85% of CSO T tf ll t f 85% f CSO – Big C (017) 72% – Bouck (013) 13% � High overflow frequency everywhere � High overflow frequency everywhere � Peak flows far exceed WWTP capacity

  38. Most Active CSOs – Rensselaer Location SPDES Mgal Hours Events Columbia/ / Second 003 8.5 109 41 Partition Partition 006 006 5.6 5.6 192 192 40 40 Central/ Barnet 010 3.2 158 52 Fowler 007 1.8 108 42 Belmore Belmore 002 002 0 5 0.5 39 39 27 27

  39. System Issues: Rensselaer � Low CSO volume, but high frequency � Pump station and force main constraints

  40. Most Active CSOs – Troy Location SPDES MGal Hours Events L ti SPDES MG l H E t Liberty 035 55 518 53 State 031 54 414 52 Hoosick Hoosick 024 024 25 25 99 99 33 33 Adams 037 25 346 50 Jacob 026 23 429 62 Federal 027 19 217 51 • Four CSOs active 500-700 hours/y • 17 CSOs ≥ 50 events/y

  41. System Issues: Troy � Two confirmed and three unconfirmed DWO locations identified locations identified � RCSD regulator modifications have been identified to eliminate DWOs identified to eliminate DWOs � Pump station constraints � River inflow � Stream connections

  42. Findings � 1,250 MG CSO per year, mostly in Troy and Albany South systems � Limited opportunities for optimization � Few low-cost solutions � DWOs in Troy; BMP solutions identified

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