APPENDIX B HABITAT EVALUATION PROCEDURES DATA AND ANALYSIS

Transcription

1 APPENDIX B HABITAT EVALUATION PROCEDURES DATA AND ANALYSIS

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3 Table B-1a. HSI Model Hydrology and Hydraulics Variables for Riverine Habitats Baseline Conditions Habitat Condition Hydrology and Hydraulics (Riverine) Model* Variable Variable Description Optimum Range Units San Marcos Range Baseline Source Potentially Affected? Mesohabitat Hydraulics - Velocity CC V1 Percent pools during average summer flow % From 0 to 100 percent depending on reach, average of Reach 4 through 12 is 26 percent SB V2 Percent pools % BG V1 Percent pool area during average summer flow Saunders et al > 60 % BK V5 Percent riffles % SB V15 Stream gradient within representative reach BG V18 Stream gradient within representative reach Average current velocity BG V15 in spawning areas (embryo) m/km From 2 to 5 in reaches 4,5,7,10,11,and12; and from 10 to 12 in reaches 6,8,and 9 Hardy 2011 < 0.5 m/km < 9 cm/sec From 2 to 11 depending on reach, average of Reach 4 through 12 is 6.09 Hardy 2011 Hydraulics - Depth Hydrology SB V14 Average current velocity BG V16 in pools and backwater areas during early summer (fry) Average current velocity BG V17 in pools and backwater areas during the growing season (juvenile) SB V4 Average depth of pools during midsummer BK V4 Percent of water area that is 60 cm in depth Water level fluctuations during spawning and for 45 days after spawning *CC = Channel Catfish; SB = Smallmouth Bass; BG = Bluegill; BK = Belted Kingfisher < 4.5 cm/sec From 0 to 10 depending on reach, average of Reach 4 through 12 is 5.01 Hardy 2011 < 4 cm/sec meter Average of 0.32 from Reach 4 through % Average of 23 from Reach 4 through 12 Slow rise previous to spawning with stable levels during and afterward index Slow rise previous to spawning with stable levels during and afterward Hardy 2011 Hardy 2011 Hardy 2011 No

4 Table B-1b. HSI Model Water Quality Variables for Riverine Habitat Baseline Conditions Habitat Condition Model* Variable Variable Description Water Quality (Riverine) Optimum Range Units San Marcos Range Baseline Source Potentially Affected? CC V7 Maximum monthly average turbidity during summer < 100 ppm Turbidity SB V9 Maximum monthly average turbidity level during the summer < 25 JTU Assume Assume Optimum Optimum Transparency BK V2 Maximum monthly average BG V6 turbidity during average summer flow Average water transparency (Secchi depth) < 50 ppm > 60 cm Assume Optimum Assume Optimum Dissolved Oxygen Average minimum dissolved CC V8 oxygen levels within pools, backwaters, or littoral areas during midsummer BG V8 Minimum dissolved oxygen range during summer >7 mg/l Seldom below 5 mg/l Bio-West 2010 index Average midsummer water CC V5 temperature within pools, backwaters, or littoral areas (adult) C Bio-West 2010 Temperature Average water temperature within CC V10 pools, backwaters, and littoral areas during spawning and embryo development (embryo) C Bio-West 2010 CC V12 Average midsummer water temperature within pools or backwaters C

5 Table B-1b, continued Habitat Condition Model* Variable Variable Description Water Quality (Riverine) Optimum Range Units San Marcos Range Baseline Source Potentially Affected? Average midsummer water CC V14 temperature within pools or backwaters (juvenile) C Water temperature in selected SB V10 habitat during the growing season (May to October) (adults) C SB V11 Water temperature in selected habitat during spawning and for 45 days afterwards (embryo) C Temperature SB V12 Water temperature in selected habitat during the growing season (May to October) (fry) SB V13 Water temperature in selected habitat during the growing season (May to October) (juvenile) C Bio-West C 2010 BG V10 Maximum midsummer temperature within pools C BG V11 Average of mean weekly water temperature within pools or littoral areas during spawning (embryo) C BG V12 Maximum early summer temperature within pools or littoral areas C ph Maximum midsummer BG V13 temperature within pools or littoral areas (juvenile) 30 C SB V6 Average ph level during the year ph Bio-West No BG V7 ph range during growing season ph index No CC V9 Maximum salinity during summer (adult) < 1 ppt <1 No Salinity Maximum salinity during CC V11 spawning and embryo development CC V13 Maximum salinity during summer (fry, juvenile) < 2 ppt <1 Bio-West No 2010 < 5 ppt <1 No BG V9 Maximum monthly average salinity during growing season < 2 ppt <1 No *CC = Channel Catfish; SB = Smallmouth Bass; BG = Bluegill; BK = Belted Kingfisher

6 Table B-1c. HSI Model Cover and Substrate Variables for Riverine Habitat Baseline Conditions Habitat Condition Instream Cover Cover and Substrate (Riverine) Model* Variable Variable Description Optimum Range Units San Marcos Range CC V2 SB V5 Percent cover of logs, boulders, cavities, brush, debris, or standing timber during summer within pools, backwater areas, and littoral areas Percent cover in the form of boulders, stumps, dead trees, and crevices (adults) or vegetation and rocks (fry) > 40 % 0-11 Baseline Source Field Survey Potentially Affected? % Percent cover (e.g., logs, BG V2 brush, and debris) within pools during summer % Instream Cover vegetation, submersed, dense stands, or finely divided leaves) BG V3 Percent cover (aquatic % Owens 2010 Hydraulics - Velocity Food production potential CC V4 by substrate type present during average summer flow SB V1 Dominant substrate type within pool or backwater Substrate composition BG V20 within pools during spawning (embryo) rubble dominant runs, >30% vegetation in pools cm, and boulder fines and gravel present index Dominated by sands and silts Owens 2010 Index index Riparian Vegetation Distance from nearest BK V7 suitable soil bank to 1-km sections of stream BK V3 Percent water surface obstruction 0 km Assume Optimum < 0 % 0 2 Field Survey Riparian Vegetation Average number of BK V6 stream subsections that contain one or more perches *CC = Channel Catfish; SB = Smallmouth Bass; BG = Bluegill; BK = Belted Kingfisher > 40 count/km > 40 Assume Optimum

7 Table B-1d. HSI Model Variables for Palustrine and Terrestrial Habitat Baseline Conditions Palustrine and Terrestrial Habitat Condition Model* Variable Variable Description Optimum Range Units San Marcos Range Baseline Source Potentially Affected? Vegetative Cover Percent of wetland basin AC V1 dominated by persistent emergent herbaceous vegetation Edge index between AC V2 emergent vegetation and open water % 55 Field > 4 index 1 Survey Percent cover of ST V1 emergent and submerged vegetation > 90 % 55 Water Temperature ST V4 (average of daily minimum and maximum during growing season) C 20 Estimation by Team Hydrology and Water Quality ST V3 Water regime AC V3 Water regime Permanently Flooded Semipermanently Flooded index Permanently flooded Field index Permanently flooded Survey ST V2 Water depth 1-2 meters 0.7 Riparian Vegetation DW V1 Basal area m 2 /ha DW V2 Number of snags > 15 cm diameter breast height > 5 count/0.4 ha Field Survey 0-4 *AC = American Coot; ST = Slider Turtle; DW = Downy Woodpecker

8 Table B-2. Downy Woodpecker (DW) Future Without and With Project (FWOP/FWP) Conditions Variable Optimum FWOP/FWP Forest Type Area Riparian Forest FWOP (acres) RIP1 (TY1 and TY50) RIP2 (TY1 and TY50) DISC (TY1 and TY50) SHORE1 (TY1 and TY50) SHORE2 (TY1 and TY50) WET (TY1 and TY50) V1 Basal Area FWOP (TY1 and TY15) (m 2 /ha) FWOP (TY25) FWOP (TY50) EXOT (TY1) EXOT (TY50) RIP (TY1) RIP (TY15) RIP (TY25) RIP (TY50) V2 Snag Density > 5 FWOP (no. > 6 dbh/acre) EXOT (TY1) EXOT (TY50) RIP (TY1) RIP (TY15) RIP (TY25) RIP (TY50)

9 Table B-3. Channel Catfish (CC) Future Without and With Project (FWOP/FWP) Conditions Reach Variable Optimum FWOP/FWP Area Riverine FWOP (acres) EXOE (TY3) EXOE (TY50) SHORE2 (TY1 and TY50) V1 Percent pools during average summer flow FWOP/FWP (%) V2 (%) Percent cover (logs, boulders, cavities, brush, debris, or standing timber during summer within pools, backwater areas, and littoral areas > 40 FWOP/FWP Food production potential by substrate type present during V4 average summer flow A FWOP C E C C C C C C (index) DISC (TY1) B B B B B B B B DISC (TY50) B B B B B B B B SED (TY3) B B B B B B B B SED (TY50) B B B B B B B B DISC/SED (TY3) A A A A A A A A DISC/SED (TY50) A A A A A A A A V5 Average midsummer water temp within pools, backwaters, or littoral areas (Adult) FWOP/FWP Maximum monthly average turbidity during summer < 100 FWOP/FWP V8 (mg/l) Average minimum dissolved oxygen levels within pools, backwaters, or littoral areas during midsummer >7 FWOP/FWP V9 Maximum salinity during summer (Adult) < 1 FWOP/FWP (ppt) V10 Average water temperatures within pools, backwaters, and littoral areas during spawning and embryo development (Embryo) FWOP/FWP V11 Maximum salinity during spawning and embryo development < 2 FWOP/FWP (ppt) V12 Average midsummer water temperature within pools or backwaters FWOP/FWP V13 Maximum salinity during summer (Fry, Juvenile) < 5 FWOP/FWP (ppt) V14 V18 (cm/sec) Average midsummer water temperature within pools or backwaters (Juvenile) FWOP/FWP Average current velocity in cover areas during average summer flow. <20 FWOP/FWP

10 Table B-4. Smallmouth Bass (SB) Future Without and With Project (FWOP/FWP) Conditions Area Riverine FWOP (acres) EXOE (TY3) EXOE (TY50) SHORE2 (TY1 and TY50) V1 Dominant substrate type within pool or backwater C FWOP A A A A A A A A (Index) DISC (TY1) B B B B B B B B DISC (TY50) B B B B B B B B SED (TY3) B B B B B B B B SED (TY50) B B B B B B B B DISC/SED (TY3) C C C C C C C C DISC/SED (TY50) C C C C C C C C V2 Percent pools FWOP/FWP (%) V4 Average depth of pools during midsummer FWOP/FWP (meter) Percent cover in the form of boulders, stumps, dead trees, and crevices V5 (adults) or vegetation and rocks (fry) FWOP/FWP (%) EXOE (TY3) EXOE (TY50) V6 Average ph level during the year FWOP/FWP (ph) V8 Minimum dissolved oxygen (DO) level throughout the year 6-8 FWOP/FWP (ppt) V9 Maximum monthly average turbidity level during the summer < 25 FWOP/FWP (JTU) V10 V11 V12 V13 Variable Optimum FWOP/FWP Water temperature in selected habitat during the growing season (May to October) (adults) FWOP/FWP Water temperature in selected habitat during spawning and for 45 days afterwards (embryo) FWOP/FWP Water temperature in selected habitat during the growing season (May to October) (fry) FWOP/FWP Water temperature in selected habitat during the growing season (May to October) (juvenile) FWOP/FWP Reach V14 Water level fluctuations during spawning and for 45 days after spawning C FWOP/FWP c c c c c c c c (index) V15 Stream gradient FWOP/FWP (m/km)

11 Table B-5. Belted Kingfisher (BK) Future Without and With Project (FWOP/FWP) Conditions Reach Variable Optimum FWP/FWOP Area Riverine FWOP (acres) EXOE SHORE V2 Average water transparency (Secchi depth) > 60 FWOP/FWP (cm) V3 Percent water surface obstruction < 0 FWOP (%) EXOE (TY3) EXOE (TY50) V4 Percent of water area that is <= 60 cm in depth > 100 FWOP/FWP (%) V5 Percent riffles FWOP/FWP (%) V6 (count/km) V7 (km) Average number of stream subsections that contain one or more perches > 40 FWOP/FWP Distance from nearest suitable soil bank from 1-km sections of stream 0 FWOP/FWP Elephant Ears Acres %

12 Table B-6. Slider Turtle (ST) Future Without and With Project (FWOP/FWP) Conditions Variable Assumptions Optimum FWP/FWOP Area Wetland FWOP 0.00 (acres) WET 1.19 Percent cover of emergent and submerged > 90% FWOP V1 vegetation 55 (%) WET 55 V2 Water Depth 1 to 2 FWOP 0.3 (m) WET 0.3 A - permanently FWOP V3 Water Regime flooded A (index) WET A V4 Water Temperature C - 25 to 30 C FWOP C (index) WET C

13 Table B-7. American Coot (AC) Future Without and With Project (FWOP/FWP) Conditions Optimum FWP/FWOP Area Lacustrine/Riverine/Herbaceous Wetland FWOP 0.00 (acres) WET 1.19 V1 Variable Percent of wetland basin dominated by persistent emergent herbaceous vegetation FWOP 55 (%) WET 55 V2 Edge index between emergent vegetation and open water > 4 FWOP 1 (index) WET 1 V3 Water regime 3 FWOP 1 (index) WET 1

14 Alternative Plan # Table B-8. AAHUs by Habitat Type for Example Alternative Plans* Measure AAHUs Description EXOT RIP EXOA SHORE DISC SED DUCK WET EDU Riverine Wetland Riparian Total No Action Plan no measures EXOT1 only RIP1 only RIP2 only EXOA1 only SHORE1 only SHORE2 only DISC1 only SED1 only DUCK1 only WET1 only EDU1 only All measures at scale RIP2 all other mesaures scale SHORE2 all other mesaures scale Maximum scale of all 1152 measures *measures were coded by scale to track plan combinations; a 0 means no implementation, a 1 means implementation at scale 1, and a 2 means implementation at scale 2; all 1,152 plan combinations were evaluated