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Wastewater Workgroup. Conference Call December 6, 2011. Estimating Point Sources for Progress Scenarios. Issues/Concerns: Comparable modeling of Point and NP sources for progress runs, milestones, Bay Barometer NPS: estimates are based on 10-year average hydrology

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wastewater workgroup

Wastewater Workgroup

Conference Call

December 6, 2011

estimating point sources for progress scenarios
Estimating Point Sources for Progress Scenarios
  • Issues/Concerns:
    • Comparable modeling of Point and NP sources for progress runs, milestones, Bay Barometer
      • NPS: estimates are based on 10-year average hydrology
      • PS: estimates are based on discharge flow data
    • PS flow discharge data is influenced by weather conditions
    • Accounting for reductions in recently upgraded facilities where discharge data is not available.
estimating point sources for progress scenarios1
Estimating Point Sources for Progress Scenarios
  • Actions Requested:
    • Provide feedback on proposed supplemental indicators
    • Provide feedback on methodology
    • Decide on flow averaging period
    • Decide on TN, TP for upgrade facilities where data is not yet available.
slide4

Progress Scenarios – Flow Comparison

Are we comparing Apples and Oranges?

Qave Nonpoint Sources

Qave Point Sources

slide5

Precipitation vs Flows/Loads

2001

Prec = 37.43 inches

2007

Precip = 37.62 inches

Annual Precipitation CY 2000 - 2010

2007

WWTP Flow = 536.3 mgd

TN Load 12.67 M lb

2001

WWTP Flow = 515 mgd

TN Load 14.94 M lb

WWTP Annual Flows CY 2000 - 2010

General Trend: Dry years => Lower WWTP Flows

Wet Years => Higher WWTP Flows

slide8

Annual Upgraded WWTP Flows

Annual Flow Weighted

TN Concentrations

Trend – Concentration decreases

showing Progress

slide9

Annual Upgraded WWTP Flows

Annual Flow Weighted

TN Concentrations

Trend – Concentration decreases

showing Progress

estimating point sources for progress scenarios2
Estimating Point Sources for Progress Scenarios
  • Proposed supplemental indicators
    • Use 10-year rolling average to estimate PS Loads
    • Use Actual TN, TP for facilities operating with upgrades for about a year
    • Use default TN, TP for facilities where data is not yet available