Instream Flows April 1, 2016 Brackenridge Park 2 Map 3 SAWS - - PowerPoint PPT Presentation

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Instream Flows April 1, 2016 Brackenridge Park 2 Map 3 SAWS - - PowerPoint PPT Presentation

Jan 12, 2023 383 likes •667 views

Instream Flows April 1, 2016 Brackenridge Park 2 Map 3 SAWS Reuse Water 4 Dos Rios Discharge at Brackenridge Park 10.00 Permit Limit = 10 mg/l 8.00 6.00 4.00 2.28 2.10 2.04 2.03 2.04 2.03 2.04 2.04 2.00 2.00 2.00 2.00 2.00

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SLIDE 1

Instream Flows

April 1, 2016

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SLIDE 2

Brackenridge Park

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Map

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SAWS Reuse Water

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Dos Rios Discharge at Brackenridge Park

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2.00 2.00 2.00 2.04 2.03 2.00 2.10 2.04 2.28 2.03 2.04 2.04 0.00 2.00 4.00 6.00 8.00 10.00

Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Feb-16 Permit Limit = 10 mg/l Graph Courtesy of San Antonio Water Systems

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Erosion Over Sidewalk

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Bridge Stops Some of the Floating Debris

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Floating Debris

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Lower San Antonio River Instream Flows Project

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Senate Bill 2

  • Goal – Conduct Scientific and

Engineering Studies to Determine Flow Regimes (both Water Quality , Quantity and Timing) Necessary to Support a Sound Ecological Environment

  • Established the Instream Flows Program
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Multi-Agency Team

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Multi-Discipline Approach

Hydrology and Hydraulics Biology Physical Processes Water Quality Connectivity

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Stakeholder Process

  • Stakeholders are a critical component of

the Texas Instream Flows Program.

  • Stakeholder meetings held 2008
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Flow Recommendations

Integrated Approach

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Flow Recommendations

  • Subsistence flows
  • Base flows (dry, average and wet)
  • High pulse flows
  • Over bank flow
  • Seasonal component
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Lower San Antonio River and Cibolo Creek Instream Flow Study

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Upcoming Stakeholder Process

  • We have:
  • Data
  • Analysis
  • Modeling
  • We need:
  • You!
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Please Save the Date

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Thursday, October 27, 2016

  • r

Friday, October 28, 2016 Location: TBD Time: TBD (one will be an evening and one will be daytime)

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Environmental Flows

  • Amount of water that should remain in

stream or river for benefit of environment, bay, & estuary while balancing human needs.

  • House Bill 3 and Senate Bill 3 – manage and

preserve water resources of state and protect instream and freshwater inflows.

  • Developed Environmental Flows Advisory

Group and Science Advisory Committee

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Guadalupe, San Antonio, Mission, & Aransas Rivers and Mission, Copano, Aransas, & San Antonio Bays Basin & Bay Expert Science Team (BBEST)

Blanco River @ Wimberley, TX Plum Creek near Luling, TX Guadalupe River @ Cuero, TX Sandies Creek near Westhoff, TX Guadalupe River @ Victoria, TX Guadalupe River near Spring Branch, TX Medina River @ San Antonio, TX San Antonio River near Falls City, TX Cibolo Creek near Falls City, TX Mission River @ Refugio, TX San Antonio River @ Goliad, TX San Marcos River @ Luling, TX San Antonio River near Elmendorf, TX Medina River @ Bandera, TX Guadalupe River @ Comfort, TX Guadalupe River @ Gonzales, TX

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GSA BBASC Recommendations

Subsistence Flows (cfs)

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Qp: 1,410 cfs with Average Frequency 2 per season Regressed Volume is 11,400 Duration Bound is 13

746 591 591 400 400 Base Flows (cfs) 791 Overbank Flows

Qp: 36,700 cfs with Average Frequency 1 per 5 years Regressed Volume is 492,000 Duration Bound is 70 Qp: 24,400 cfs with Average Frequency 1 per 2 years Regressed Volume is 306,000 Duration Bound is 57 Qp: 14,300 cfs with Average Frequency 1 per year Regressed Volume is 165,000 Duration Bound is 43

High Flow Pulses

Qp: 4,140 cfs with Average Frequency 1 per season Regressed Volume is 48,300 Duration Bound is 29 Qp: 6,590 cfs with Average Frequency 1 per season Regressed Volume is 58,400 Duration Bound is 24

727 796

Qp: 1,760 cfs with Average Frequency 1 per season Regressed Volume is 14,800 Duration Bound is 14 Qp: 4,330 cfs with Average Frequency 1 per season Regressed Volume is 41,200 Duration Bound is 23 Qp: 1,150 cfs with Average Frequency 2 per season Regressed Volume is 9,640 Duration Bound is 13 Qp: 3,250 cfs with Average Frequency 2 per season Regressed Volume is 26,900 Duration Bound is 17 Qp: 950 cfs with Average Frequency 2 per season Regressed Volume is 7,060 Duration Bound is 10 210 210 210

Summer Fall Winter Spring

180

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TCEQ Environmental Flow Standards

Subsistence Flows (cfs)

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

210 210 210

Summer Fall Winter Spring

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Base Flows (cfs) High Flow Pulses 796

Qp: 1,150 cfs with Average Frequency 2 per season Regressed Volume is 9,640 Duration Bound is 13 Qp: 3,250 cfs with Average Frequency 2 per season Regressed Volume is 26,900 Duration Bound is 17 Qp: 1,760 cfs with Average Frequency 2 per season Regressed Volume is 14,800 Duration Bound is 14 Qp: 1,410 cfs with Average Frequency 2 per season Regressed Volume is 11,400 Duration Bound is 13

746 791 727

1)Hardy Base flow adjustment. 2)50% Rule between Base and Subsistence. 3)Pulse Exemption Rule.

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SLIDE 23

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TCEQ Environmental Flow Standards for SARB

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Mid-Basin Surface Water Project

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Lower Basin New Appropriation

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Mid-Basin Project Firm Yield

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TCEQ Standards

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Next Steps

  • TCEQ implementing Environmental Flow

Standards on new/amended water rights.

  • SARA continues to fund and support

scientific studies to refine numbers appropriate for instream and environmental flows.

  • Revisions to standards made in ten years

from adoption. (2022)

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Questions

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