Myakka River Watershed Initiative Myakka River Watershed Initiative - - PowerPoint PPT Presentation

Myakka River Watershed Initiative Myakka River Watershed Initiative Status Briefing and Next Steps Status Briefing and Next Steps September 12, 2008 September 12, 2008

2 2

Myakka River Watershed Initiative Myakka River Watershed Initiative Status

Status

• Project Recap and Background

Project Recap and Background

• Water Budget Modeling

Water Budget Modeling

• Floodplain Modeling

Floodplain Modeling

• Where we go from here

Where we go from here

3 3

Background Background

• Classie Farms and Pacific Tomato projects developed in

Classie Farms and Pacific Tomato projects developed in response to study findings response to study findings

• Environmental concerns continue in the Upper watershed

Environmental concerns continue in the Upper watershed

• MFL indicates

MFL indicates “ “excess excess” ” water present in the Upper water present in the Upper Myakka River Myakka River

• Staff requests funding to initiate watershed wide study

Staff requests funding to initiate watershed wide study (comprehensive watershed management) on the Myakka (comprehensive watershed management) on the Myakka River to address alterations and work toward desired River to address alterations and work toward desired watershed condition watershed condition

• Singhofen & Associates team awarded MRWI contract.

Singhofen & Associates team awarded MRWI contract.

• NTP December 2006

NTP December 2006

4 4

Project Objectives Project Objectives

• Evaluate and illustrate the effects of past

Evaluate and illustrate the effects of past activities in the watershed (e.g. land use activities in the watershed (e.g. land use conversions and alterations) conversions and alterations)

• Develop and evaluate structural and non

Develop and evaluate structural and non-

• structural best management practices (BMPs) in

structural best management practices (BMPs) in

• rder to:
• rder to:
• Restore natural systems

Restore natural systems

• Address water supply issues

Address water supply issues

• Address water quality issues

Address water quality issues

• Provide flood protection

Provide flood protection

• Develop floodplain information suitable for FEMA

Develop floodplain information suitable for FEMA Flood Insurance Rate Map (FIRM) updates. Flood Insurance Rate Map (FIRM) updates.

5 5

Flood Protection Natural Systems Water Quality Water Supply

6 6

Watershed Evaluation Watershed Mgmt. Plan Implementation

• f BMPs

Maintenance of Watershed Parameters and Models Topographic Information

Myakka River Watershed Initiative Myakka River Watershed Initiative

Upper Myakka Water Budget Adaptive Mgmt. Monitoring

7 7

Water Budget Modeling Water Budget Modeling

• Modeling objectives

Modeling objectives

• Model setup and calibration

Model setup and calibration

• Initial model scenarios:

Initial model scenarios:

• Historical Conditions

Historical Conditions

• Existing Conditions Without Irrigation

Existing Conditions Without Irrigation

• Future Conditions

Future Conditions

• Next steps: Flatford Swamp hydroperiod

Next steps: Flatford Swamp hydroperiod restoration alternatives restoration alternatives

8 8

Modeling Objectives Modeling Objectives

• Estimate the excess

Estimate the excess flows flows

• Investigate linkages

Investigate linkages between land use/ land between land use/ land practices and excess practices and excess flows, flows,

• Develop time

Develop time-

• series of

series of flow rates for possible flow rates for possible pollutant load modeling, pollutant load modeling,

• Evaluate alternative

Evaluate alternative management scenarios management scenarios for restoring the natural for restoring the natural hydrology of the Upper hydrology of the Upper Myakka River Myakka River Watershed, and Watershed, and

• Simulate hydroperiods of

Simulate hydroperiods of the Flatford Swamp the Flatford Swamp under historic, existing, under historic, existing, and proposed conditions and proposed conditions (This may also become (This may also become necessary in other necessary in other areas). areas).

9 9

Modeling Objectives Modeling Objectives -

• Exclusions

Exclusions

• Flood Protection Evaluations

Flood Protection Evaluations

• Water Quality Simulations

Water Quality Simulations

• Local

Local-

• Scale Features and Process Evaluations:

Scale Features and Process Evaluations:

• This is a sub

This is a sub-

• regional model with spatial scales

regional model with spatial scales appropriate for sub appropriate for sub-

• regional evaluations.

regional evaluations.

• Evaluation of alternative management scenarios and

Evaluation of alternative management scenarios and hydroperiods of specific wetlands may require the hydroperiods of specific wetlands may require the development of one or more local development of one or more local-

• scale models.

scale models.

• This sub

This sub-

• regional model may provide boundary

regional model may provide boundary conditions to future local scale models. conditions to future local scale models.

10 10

Model Tool Selection: MIKE SHE Model Tool Selection: MIKE SHE

• Fully

Fully-

• coupled

coupled groundwater groundwater and surface and surface water models water models

• Coupled with

Coupled with dynamic dynamic streamflow streamflow routing model routing model

• Represents all

Represents all

• f the major
• f the major

processes of processes of the land the land-

• based

based portion of the portion of the hydrologic cycle hydrologic cycle

11 11

Model Setup and Calibration Model Setup and Calibration

• 2

2-

• layer groundwater model representing the upper and

layer groundwater model representing the upper and lower surficial aquifer system lower surficial aquifer system

• 125 x 125

125 x 125-

• meter (410 x 410 ft) grid cells in 3

meter (410 x 410 ft) grid cells in 3-

• D

D groundwater and 2 groundwater and 2-

• D surface water models

D surface water models

• 1

1-

• D open channel flow model of the Myakka River plus 9

D open channel flow model of the Myakka River plus 9 tributaries tributaries

• Explicit representation of irrigation

Explicit representation of irrigation

• Physically

Physically-

• based representations of ET and unsaturated

based representations of ET and unsaturated zone processes zone processes

• Calibration Period: May 1999

Calibration Period: May 1999-

• April 2006

April 2006

• Verification Period: May 1994

Verification Period: May 1994-

• April 1999

April 1999

12 12

Topography Topography and and Bathymetry Bathymetry

• 125 meter

125 meter grid cells grid cells

• Recent

Recent LiDAR data LiDAR data

• Adjusted in

Adjusted in water bodies water bodies using survey using survey data data

13 13

Land Use / Land Use / Land Cover Land Cover

• Eleven (11) land

Eleven (11) land use categories, use categories, derived from derived from SWFWMD 2004 SWFWMD 2004 FLUCCS FLUCCS-

• based

based mapping. mapping.

• Row Crops were

Row Crops were subdivided into subdivided into active and fallow active and fallow fields fields

• Model

Model parameters parameters varied by land varied by land use: use:

• ET

ET parameters, parameters,

• verland flow
• verland flow

roughness, roughness,

14 14

Pomello – MW Drained Myakka – SP Drained Waveland – P Drained Eaugallie – P Drained Floridana – VP Drained

Soils Soils

• Five (5)

Five (5) representative soil representative soil types, based on types, based on NRCS mapping NRCS mapping

• Model parameters

Model parameters varied by soil type: varied by soil type:

• Volumetric water

Volumetric water contents at contents at saturation, field saturation, field capacity, and wilting capacity, and wilting point; point;

• Saturated and

Saturated and unsaturated unsaturated hydraulic hydraulic conductivities; conductivities;

• Soil moisture

Soil moisture retention retention characteristic characteristic curves; curves;

• Saturated zone

Saturated zone drainage time drainage time constant constant

15 15

MIKE MIKE-

• 11

11 Network Network

• 1

1-

• D unsteady

D unsteady-

• flow hydraulic

flow hydraulic model of the model of the Myakka River Myakka River and nine (9) and nine (9) tributaries tributaries

• Approximately

Approximately 100 surveyed 100 surveyed cross sections cross sections

MIKE-11 Branch

16 16

Precipitation Precipitation

• NEXRAD radar

NEXRAD radar rainfall data rainfall data

• Gage corrected

Gage corrected by OneRain, Inc. by OneRain, Inc.

• Hourly rainfall

Hourly rainfall time step time step

• 265 pixels,

265 pixels, approximately approximately 2 km x 2 km 2 km x 2 km

17 17

Evapotranspiration Evapotranspiration

• Time

Time-

• varying crop coefficients applied to each

varying crop coefficients applied to each hydrologic land use category hydrologic land use category

• MIKE SHE converts potential ET to actual ET

MIKE SHE converts potential ET to actual ET

• Equations consider leaf area index and root depths

Equations consider leaf area index and root depths

• ET also depends on availability of water in the root

ET also depends on availability of water in the root zone. zone.

18 18

Irrigation Irrigation Command Command Areas Areas

Grid Code

• 43 WUPs

43 WUPs

• Irrigation demand

Irrigation demand calculated by the calculated by the model based on model based on soil moisture soil moisture deficits. deficits.

• Soil

Soil saturation saturation reference reference water content water content for bed prep. for bed prep. (row crops (row crops

• nly)
• nly)
• Field capacity

Field capacity is reference is reference for crop for crop growth stages growth stages (row crops (row crops and citrus) and citrus)

19 19

Spatially Averaged Irrigation Rates Spatially Averaged Irrigation Rates (simulated) (simulated)

• All Irrigated Row Crops:

All Irrigated Row Crops: 31.6 31.6” ” per year per year

• All Citrus:

All Citrus: 8.5 8.5” ” per year per year

• Maple Creek Basin:

Maple Creek Basin: 6.8 6.8” ” per year per year

• Coker Creek Basin:

Coker Creek Basin: 5.7 5.7” ” per year per year

• Ogleby Creek Basin:

Ogleby Creek Basin: 3.9 3.9” ” per year per year

• MR Upstream of Wachula Rd:

MR Upstream of Wachula Rd: 3.1 3.1” ” per year per year

• Upper Myakka River:

Upper Myakka River: 1.8 1.8” ” per year per year

20 20

Model Calibration Procedure Model Calibration Procedure

• Set targets for model performance

Set targets for model performance

• Quantitative and qualitative

Quantitative and qualitative

• Flows

Flows

• Stages

Stages

• Agreement with analytical water budgets

Agreement with analytical water budgets

• Run model with measured rainfall (1999

Run model with measured rainfall (1999-

• 2006)

2006) and compare results with measured data and compare results with measured data

• Adjust selected model parameters within

Adjust selected model parameters within acceptable ranges to improve goodness acceptable ranges to improve goodness-

• of
• f-
• fit

fit

21 21

Locations of Locations of USGS USGS Streamflow Streamflow Stations Stations

• and

and -

• Gauged Sub

Gauged Sub-

• watershed

watershed Boundaries, Boundaries, for Reporting for Reporting Water Budget Water Budget Results Results

22 22

Water Budget Water Budget

The equation for the water budget of the Upper The equation for the water budget of the Upper Myakka River watershed can be written as: Myakka River watershed can be written as: P + I P + I – – ET ET – – Q Q – – DR = DS DR = DS where: where:

• P = precipitation

P = precipitation

• I = irrigation inputs

I = irrigation inputs

• ET = total evapotranspiration

ET = total evapotranspiration

• Q = total streamflow (runoff plus baseflow)

Q = total streamflow (runoff plus baseflow)

• DR = deep recharge

DR = deep recharge

• DS = change in storage

DS = change in storage

23 23

Analytical and Simulated (numerical) Analytical and Simulated (numerical) Water Budget Comparison Water Budget Comparison

Analytical Water Budget (1993-2005) Simulated Water Budget (1999-2006) Basin Inflows (average inches per year) Rainfall

• 58.7
• 58.4

Irrigation

• 2.3
• 1.8

Basin Outflows (average inches per year) Evapotranspiration +40.6 +41.1 Streamflow +19.0 +18.7 Deep Recharge +0.9 +0.9

Notes: 1. Table values represent spatial averages over entire Upper Myakka watershed.

• 2. Values do not sum to zero due to changes in storage.

24 24

Myakka R iver at Myakka C ity F low C alibration

1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 J a n ‐ 9 9 J a n ‐ J a n ‐ 1 J a n ‐ 2 J a n ‐ 3 J a n ‐ 4 J a n ‐ 5 J a n ‐ 6 J a n ‐ 7 Daily Dis charge, C F S Measured S imulated

25 25

Myakka R iver at Myakka C ity F low C alibration

100,000 200,000 300,000 400,000 500,000 600,000 J a n ‐ 9 9 J a n ‐ J a n ‐ 1 J a n ‐ 2 J a n ‐ 3 J a n ‐ 4 J a n ‐ 5 J a n ‐ 6 J a n ‐ 7 Accumulated Dis charge, C F S days S imulated Measured

26 26

Myakka R iver at Myakka C ity F low C alibration

1 10 100 1,000 10,000 10 20 30 40 50 60 70 80 90 100 Percentage of Time Dis charge is E qualed or E xceeded Daily Dis charge, C F S S imulated Measured

27 27

Myakka R iver at Myakka C ity F low C alibration

0.0 1.0 2.0 3.0 4.0 5.0 6.0 D J F M A M J J A S O N D J Month Monthly Average Dis charge, inches S imulated Measured

28 28

Water Level Calibration Water Level Calibration Flatford Swamp Near Myakka River Flatford Swamp Near Myakka River

Water Level in Feet, NAVD88

Measured Simulated

29 29

Land Use Scenarios Land Use Scenarios

• Existing Conditions (calibration/verification

Existing Conditions (calibration/verification periods) periods)

• Historical Land Use (early 1950

Historical Land Use (early 1950’ ’s) s)

• Existing Conditions with No Irrigation

Existing Conditions with No Irrigation (hypothetical) (hypothetical)

• Future Land Use (2025)

Future Land Use (2025)

30 30

Historical Historical Land Use Land Use Simulation Simulation

• Early 1950

Early 1950’ ’s s Land Use Land Use

• No irrigation

No irrigation

• Same rainfall

Same rainfall dataset and dataset and reference ET as reference ET as used in the used in the existing existing conditions conditions

• Isolates the

Isolates the effects of effects of anthropogenic anthropogenic changes changes

31 31

Water Budget Comparisons: Myakka Water Budget Comparisons: Myakka River Near Sarasota River Near Sarasota

Simulated Existing Simulated Existing Water Budget Water Budget Simulated Simulated Historical Water Historical Water Budget (run 1) Budget (run 1) Basin Inflows Basin Inflows (average inches per year) (average inches per year) Rainfall Rainfall

• 58.4

58.4

• 58.4

58.4 Irrigation Irrigation

• 1.8

1.8 Basin Outflows Basin Outflows (average inches per year) (average inches per year) Evapotranspiration Evapotranspiration +41.1 +41.1 +41.6 +41.6 Streamflow Streamflow +18.7 +18.7 +16.0 +16.0 Deep Recharge (net) Deep Recharge (net) +0.9 +0.9 +0.9 +0.9

32 32

Existing Conditions with no Irrigation Existing Conditions with no Irrigation

• Hypothetical Scenario

Hypothetical Scenario

• 2004 land use, with the following changes:

2004 land use, with the following changes:

• Row crops replaced with pasture

Row crops replaced with pasture

• Irrigation routines disabled

Irrigation routines disabled

33 33

Simulated Flow Simulated Flow-

• Duration Curves

Duration Curves

Myakka River near Sarasota (preliminary) Myakka River near Sarasota (preliminary)

0.1 1 10 100 1000 10000 10 20 30 40 50 60 70 80 90 100 Percentage of Time Discharge is Equaled or Exceeded Daily Discharge, CFS

UMExis ting No Irrigation UMExis ting UMHis toric

34 34

Future Future Land Use Land Use Simulation Simulation

• 2025 Land Use

2025 Land Use

• No Irrigation

No Irrigation

• Rainfall and

Rainfall and reference ET reference ET same as existing same as existing conditions. conditions.

• Assume most

Assume most agricultural lands agricultural lands will convert to will convert to low low-

• density

density residential residential subdivisions: subdivisions:

• 10%

10% impervious impervious surfaces surfaces

• 0.5

0.5” ” retention retention storage to storage to simulate simulate stormwater stormwater BMPs. BMPs.

35 35

Water Budget Comparisons: Myakka Water Budget Comparisons: Myakka River Near Sarasota River Near Sarasota

Simulated Existing Simulated Existing Water Budget Water Budget Simulated Future Simulated Future Land Use Water Land Use Water Budget Budget Basin Inflows Basin Inflows (average inches per year) (average inches per year) Rainfall Rainfall

• 58.4

58.4

• 58.4

58.4 Irrigation Irrigation

• 1.8

1.8 Basin Outflows Basin Outflows (average inches per year) (average inches per year) Evapotranspiration Evapotranspiration +41.1 +41.1 +38.0 +38.0 Streamflow Streamflow +18.7 +18.7 +19.9 +19.9 Deep Recharge (net) Deep Recharge (net) +0.9 +0.9 +0.9 +0.9

36 36

Simulated Accumulated Discharge Simulated Accumulated Discharge

Myakka River near Sarasota (preliminary) Myakka River near Sarasota (preliminary)

37 37

Simulated Flow Simulated Flow-

• Duration Curves

Duration Curves

Myakka River near Sarasota (preliminary) Myakka River near Sarasota (preliminary)

38 38

Erosion and Erosion and Sedimentation Sedimentation

39 39

40 40

Next Steps Next Steps… …

• Finalizing model as result of peer review

Finalizing model as result of peer review comments. comments.

• Develop and evaluate alternatives for restoration

Develop and evaluate alternatives for restoration

• f Flatford Swamp hydroperiods
• f Flatford Swamp hydroperiods
• Baseline wetland communities

Baseline wetland communities-

• calibration to hydrologic

calibration to hydrologic scenarios. scenarios.

• Diversion scenarios including how we divert.

Diversion scenarios including how we divert.

41 41

Floodplain Modeling Floodplain Modeling

• Overview

Overview -

• 600 sq. miles

600 sq. miles

• Multiple sub

Multiple sub-

• watershed scale

watershed scale models models -

• ICPR

ICPR

• Focus on main stem and Upper

Focus on main stem and Upper Myakka region Myakka region

• Limited update to existing

Limited update to existing watershed models watershed models

42 42

Floodplain Modeling Floodplain Modeling

• Work To Date

Work To Date -

• Compiled and reviewed available

Compiled and reviewed available information information

• Literature search

Literature search

• SWFWMD Permit files

SWFWMD Permit files

• Available survey data and

Available survey data and models models

• Reference documents database

Reference documents database

• Conducted Phase 1 Survey

Conducted Phase 1 Survey

• Survey Phase 2 in progress.

Survey Phase 2 in progress.

43 43

What What’ ’s Next? s Next?

• Floodplain Modeling

Floodplain Modeling

• Junction reach networks

Junction reach networks

• Sub

Sub-

• basin delineation

basin delineation

• Incorporate input from

Incorporate input from stakeholders stakeholders

• Field reconnaissance

Field reconnaissance

• Survey needs

Survey needs

MRWI Singhofen Team MRWI Singhofen Team Schedule Schedule

J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D

PROJECT DEVELOPMENT DIGITAL TOPOGRAPHIC INFORMATION INDEPENDENT QUALITY ASSURANCE UPPER MYAKKA WATER BUDGET Peer Review & model updates WATERSHED EVALUATION Flatford Swamp Sub-Basin Myakka River Watershed WATERSHED MANAGEMENT PLAN Flatford Swamp Sub-Basin Myakka River Watershed IMPLEMENTATION OF FLATFORD BMPs MWRI schedule as of September 10, 2008 ACTIVITY 2010 2006 2007 2008 2009

45 45

Discussion / Questions? Discussion / Questions?