![Page 1: Status of Instream Flow Science in the Southeastern US Mary M. Davis, Ph.D., Technical Advisor Southern Instream Flow Network](https://reader036.vdocuments.net/reader036/viewer/2022062620/551adbe1550346b2288b60e6/html5/thumbnails/1.jpg)
Status of Instream Flow Sciencein the Southeastern US
Mary M. Davis, Ph.D., Technical AdvisorSouthern Instream Flow Network
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Objectives
• Present a scientific framework for establishing protective instream flow criteria
• Provide an update on advances in instream flow science in SE US
• Strengthen links between mollusk and instream flow scientists in the region
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“Hydrologic regimes are the master variables in aquatic ecosystems.” Poff et al. 1997
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Alteration of hydrologic regimes is a primary threat to the ecological
integrity of aquatic ecosystems.
Source: USFSCSIROMk2-B2 Scenario
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WaterManagement
Who decides how much water needs to stay in the rivers?
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IFIM
ELOHA
ESWM
Scientifically credible environmental flow standards are necessary to balance economic pressures.
IFIM
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Southern Instream Flow Network
Purpose - To facilitate protective instream flow policies and practices in 15 southern states by providing science-based resources and opening lines of communication.
More information at: www.southeastaquatics.net/programs/sifn/
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Southern State Approaches for Determining IF Standards
• Minimum flow threshold– 7Q10 (e.g., AL, LA, MS)– Modified Tennant (e.g., AR, GA, SC)
• Statistically based standards(e.g., FL St Johns WMD, Potomac River Commission)
• Percent of flow approaches(e.g., FL SW Florida and Suwannee River WMDs, TN Presumptive WQ Standard)
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Science-based Methods to Determine Instream Flow Needs
• Incremental Flow Method (IFIM)
• Ecologically Sustainable Water Management (ESWM)
• Ecological Limits of Hydrologic Alteration (ELOHA)
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Science-based Methods to Determine Instream Flow Needs
• Incremental Flow Method (IFIM)
• Ecologically Sustainable Water Management (ESWM)
• Ecological Limits of Hydrologic Alteration (ELOHA)
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Ecological Limits of Hydrologic Alteration (ELOHA)
http://conserveonline.org/workspaces/eloha
(Source: Poff et al. 2010)
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Bioti
c in
dica
tor
Hydrologic alteration
Ecological Limits of Hydrologic Alteration (ELOHA)
http://conserveonline.org/workspaces/eloha
(Source: Poff et al. 2010)
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Characteristic species
Thriving species
1.0
0.9 -
0.8 -
0.7 -
0.6 -
0.5 -
0.4 -
0.3 -
0.2 -
0.1 -
0.0
Prop
ortio
n of
initi
al fi
sh
popu
latio
n m
etric
Proportion of index flow removed
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
Adverse resource impact
Acceptable resource impact
Source: Michigan Groundwater Conservation Advisory Council, 2007
EC
OLO
GIC
AL
CO
ND
ITIO
NUse of Ecological Response to
Limit Flow Alteration
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0
400
800
1200
1600
2000
0 50 100 150 200 250 300 350
Flo
w (
cfs)
10%
8%
13%
18%
LFT = 67 cfs
Example Flow PrescriptionPercent of Flow and Seasonality
of allowable cumulative withdrawals
Day of YearSource: Southwest Florida Water Management District MFL Program
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Objectives
• Present a scientific framework for establishing protective instream flow criteria
• Provide an update on advances in instream flow science in SE US
• Strengthen links between mollusk and instream flow scientists in the region
![Page 16: Status of Instream Flow Science in the Southeastern US Mary M. Davis, Ph.D., Technical Advisor Southern Instream Flow Network](https://reader036.vdocuments.net/reader036/viewer/2022062620/551adbe1550346b2288b60e6/html5/thumbnails/16.jpg)
• Problem: The limited focus on research and funding for instream flows has resulted in a lack of science to support protective instream flow standards.
• Objective: to highlight research needs and coordinate sources of funding and research to address these needs.
• Goal: to ensure that instream flow research is focused on the needs of water resource managers for scientifically credible and protective state instream flow standards and practices.
Southern Instream Flow Research Agendawww.southeastaquatics.net/programs/sifn
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South AtlanticGulf Coast Prairie
Support for theSouthern Instream Flow Research Agenda
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Instream Flow Products Under Development for the LCCs
• Hydrologic Foundation • Ecological Databases • Flow-ecology Literature Review• Flow Alteration Assessment • River Classification• Aquatic Conservation Priorities
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Integration of Instream Research Agenda ProductsTo Develop Flow-Ecology Relationships
Ecol
ogic
al C
ondi
tion
Hydrologic Alteration
+
+
-
- 0
Hydrologic Models
Ecological ConditionAssessment
Aquatic Conservation Priority Areas
Sources of Flow Alteration
River Classification
Hypothetical Flow-Ecology Relationships
Quantify Flow Alteration
EcologicalMetric
Research Priorities and ValidationEc
olog
ical
Dat
a
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Integration of Instream Research Agenda ProductsTo Develop Flow-Ecology Relationships
Ecol
ogic
al C
ondi
tion
Hydrologic Alteration
+
+
-
- 0
Hydrologic Models
Ecological ConditionAssessment
Aquatic Conservation Priority Areas
Sources of Flow Alteration
River Classification
Hypothetical Flow-Ecology Relationships
Quantify Flow Alteration
EcologicalMetric
Research Priorities and ValidationEc
olog
ical
Dat
a
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SE River Classification
• Based on existing classifications
• Hierarchical scales for geomorphology, hydrology, and biota
• Principals: John Faustini, USFWS and Chris Konrad, USGS
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SARP Flow Alteration Assessment
Approach – Qualitatively assess sources, spatial distribution, and relative magnitude of hydrologic alteration from water consumption, impervious cover, and dams.
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Preliminary SE Flow-Ecology Relationships
Source: McManamay et al. 2011
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Objectives
• Present a scientific framework for establishing protective instream flow criteria
• Provide an update on advances in instream flow science in SE US
• Strengthen links between mollusk and instream flow scientists in the region
![Page 25: Status of Instream Flow Science in the Southeastern US Mary M. Davis, Ph.D., Technical Advisor Southern Instream Flow Network](https://reader036.vdocuments.net/reader036/viewer/2022062620/551adbe1550346b2288b60e6/html5/thumbnails/25.jpg)
Integration of Instream Research Agenda ProductsTo Develop Flow-Ecology Relationships
Ecol
ogic
al C
ondi
tion
Hydrologic Alteration
+
+
-
- 0
Hydrologic Models
Ecological ConditionAssessment
Aquatic Conservation Priority Areas
Sources of Flow Alteration
River Classification
Hypothetical Flow-Ecology Relationships
Quantify Flow Alteration
EcologicalMetric
Research Priorities and ValidationEc
olog
ical
Dat
a
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Priority Instream Flow Research Topic 3:Compile regional aquatic ecology data sets
Multistate Aquatic Resources Information Systemwww.marisdata.org
Integrating State Data into the National Fish Habitat Assessment
MARIS States (2010)
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Conclusions:
• Instream flow science is advancing through state, regional, and national efforts.
• Access to biological monitoring data is key to developing scientific flow-ecology relationships.
• Good communication among mollusk scientists and instream flow programs will be key to leveraging limited resources and protection of southern aquatic resources.