Santa Ana River Wasteload Allocation Model Update BASIN MONITORING - - PowerPoint PPT Presentation

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Santa Ana River Wasteload Allocation Model Update BASIN MONITORING - - PowerPoint PPT Presentation

Dec 18, 2023 184 likes •320 views

Santa Ana River Wasteload Allocation Model Update BASIN MONITORING PROGRAM TASK FORCE August 16, 2017 Model Development Existing WLAM (R4) WLAM Update Expanded Area 564 subareas were delineated. Each subarea consists of

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SLIDE 1

Santa Ana River Wasteload Allocation Model Update

August 16, 2017

BASIN MONITORING PROGRAM TASK FORCE

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SLIDE 2

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Model Development

Existing WLAM (R4)

WLAM Update Expanded Area

  • 564 subareas were delineated.
  • Each subarea consists of
  • Stream segment,
  • Pervious land area, and
  • Impervious land area.
  • They were delineated based on:
  • Topography
  • Drainage Patterns
  • Types of stream channels, and
  • Location of gaging stations and recharge basins
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SLIDE 3

3

Schematic Diagram of HSPF TDS Simulation

Storage of TDS on Surface for Direct Wash-off by Overland Flow Storage of TDS Associated with Interflow Storage of TDS Associated with Active Groundwater Total Outflow

  • f TDS

Storage of TDS on Surface for Direct Wash-off by Overland Flow

PQUAL IQUAL

TDS from Upstream Reaches Total Wash-off Outflow

  • f TDS

TDS from Precipitation TDS (VOL*CON) Storage TDS of Outflow from Reach

CONS

PERVIOUS LAND AREA IMPERVIOUS LAND AREA STREAM SEGMENT (REACH)

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SLIDE 4

4

Schematic Diagram of HSPF TIN Simulation

TIN from Upstream Reaches TIN from Precipitation OXRX Subroutine Simulate primary dissolved oxygen and biochemical

  • xygen demand

balances NUTRX Subroutine Determine TIN balances TIN of Outflow from Reach

RQUAL

STREAM SEGMENT (REACH)

Storage of TIN on Surface for Direct Wash-off by Overland Flow Storage of TIN Associated with Interflow Storage of TIN Associated with Active Groundwater Total Outflow

  • f TIN

Storage of TIN on Surface for Direct Wash-off by Overland Flow

PQUAL IQUAL

Total Wash-off Outflow

  • f TIN

PERVIOUS LAND AREA IMPERVIOUS LAND AREA

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SLIDE 5

100 200 300 400 500 600 700 800 900 1,000 Oct-94 Oct-96 Oct-98 Oct-00 Oct-02 Oct-04 Model-Calculated Daily TDS, mg/L

Mean Residual = 16.4 mg/L

Daily TDS at Santa Ana River at MWD Crossing

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R4 – WY 1995 to 2006

100 200 300 400 500 600 700 800 900 1,000 Oct-06 Oct-08 Oct-10 Oct-12 Oct-14 Model-Calculated Daily TDS, mg/L

Mean Residual = -0.9 mg/L

HSPF – WY 2007 to 2016

Observed Model-Calculated

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SLIDE 6

100 200 300 400 500 600 700 800 900 1,000 Oct-06 Oct-08 Oct-10 Oct-12 Oct-14 Model-Calculated Daily TDS, mg/L

Daily TDS at Santa Ana River below Prado

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Mean Residual = 27.5 mg/L

HSPF – WY 2007 to 2016

100 200 300 400 500 600 700 800 900 1,000 Oct-94 Oct-96 Oct-98 Oct-00 Oct-02 Oct-04 Model-Calculated Daily TDS, mg/L

Mean Residual = 20.7 mg/L

R4 – WY 1995 to 2006

Observed Model-Calculated

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SLIDE 7

100 200 300 400 500 600 700 800 900 1,000 Oct-06 Oct-08 Oct-10 Oct-12 Oct-14 Model-Calculated Daily TDS, mg/L

Daily TDS at Santa Ana River at Imperial HWY near Anaheim

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Mean Residual = 31.1 mg/L

HSPF – WY 2007 to 2016

Observed Model-Calculated

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SLIDE 8

2 4 6 8 10 12 14 16 Oct-06 Oct-08 Oct-10 Oct-12 Oct-14 Model-Calculated Daily TIN, mg/L 2 4 6 8 10 12 14 16 Oct-94 Oct-96 Oct-98 Oct-00 Oct-02 Oct-04 Model-Calculated Daily TIN, mg/L

Mean Residual = -0.45 mg/L

Daily TIN at Santa Ana River at MWD Crossing

8

R4 – WY 1995 to 2006

Mean Residual = 0.32 mg/L

HSPF – WY 2007 to 2016

Observed Model-Calculated

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SLIDE 9

2 4 6 8 10 12 14 16 Oct-06 Oct-08 Oct-10 Oct-12 Oct-14 Model-Calculated Daily TIN, mg/L 2 4 6 8 10 12 14 16 Oct-94 Oct-96 Oct-98 Oct-00 Oct-02 Oct-04 Model-Calculated Daily TIN, mg/L

Daily TIN at Santa Ana River below Prado

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Mean Residual = 0.02 mg/L

HSPF – WY 2007 to 2016

Mean Residual = -0.07 mg/L

R4 – WY 1995 to 2006

Observed Model-Calculated

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SLIDE 10

2 4 6 8 10 12 14 16 Oct-06 Oct-08 Oct-10 Oct-12 Oct-14 Model-Calculated Daily TIN, mg/L

Daily TIN at Santa Ana River at Imperial HWY near Anaheim

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Mean Residual = -0.38 mg/L

HSPF – WY 2007 to 2016

Observed Model-Calculated

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SLIDE 11

Next Steps

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  • Complete TDS and TIN Recalibration of WLAM
  • Work with SAWPA staff, Basin Monitoring Program Task Force

Representatives, and the Regional Board staff

  • To specify range of portable discharge conditions including:
  • Maximum expected discharge of treated water under current and 2040

conditions

  • Maximum expected re-use of recycled water under current and 2040

conditions

  • Effluent limits for TIN and TDS in the most recent NPDES permit
  • To identify percolation ponds and retention basins where treated wastewater

is regularly recharged to groundwater and where such discharge are presently governed by permits issued by the Regional Board

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SLIDE 12

12

QUESTIONS?