2.3.4 Mysis Relicta - Tables - Utilities and Energy Management

TABLE 2.3.4-1: SUMMARY OF FIELD ACTIVITIES Cayuga Lake Mysis relicta Population

YEAR	TIME	DATE	PRIMARY EQUIPMENT	OBJECTIVE
1994	Day	08/06/94 10/26/94	70 kilohertz (kHz) 70 kHz, Nets	Determine daytime distribution of M. relicta.
	Night	08/07/94 10/10/94 10/10/94 10/26/94	70 kHz 70 kHz Nets Nets	Determine distribution of M. relicta around intake location.
	Early Evening	10/27/94	420 kHz	Observe daily vertical migration.
YEAR	SAMPLING METHOD	DATE	PRIMARY EQUIPMENT	OBJECTIVE
1995	Diurnal Sampling	07/24/95 08/07/95 08/28/95 09/10/95 09/21/95	420 kHz 420 kHz, 70 kHz 420 kHz, 70 kHz 420 kHz, 70 kHz 420 kHz, 70 kHz	Observe daily vertical migrations to determine the amount of time M. relicta spend near intake depth.
	Lake-Wide Survey	08/08/95 08/09/95 09/05/95 09/06/95	420 kHz, 70 kHz 420 kHz, 70 kHz 420 kHz, 70 kHz 420 kHz, 70 kHz	Determine if southern basin population differs from rest of lake.
	Light Experiment	07/25/95 08/29/95 08/30/95 09/19/95 10/17/95	420 kHz 420 kHz 420 kHz 420 kHz, 70 kHz 420 kHz, 70 kHz	Test response of M. relicta to artificial light sources. Shallow water and benthic tests performed.
1996	Lake-Wide Survey	05/02/96 05/06/96 05/13/96 05/14/96 05/20/96	Nets Nets Nets Nets 420 kHz, 70 kHz	Determine if southern basin population differs from the rest of the lake.
	Daytime Survey	05/25/96 06/14/96 06/20/96 07/12/96 07/24/96 08/21/96	420 kHz, 70 kHz 420 kHz, 70 kHz 420 kHz, Wavelength Specific Licor 420 kHz 420 kHz 420 kHz	Determine depth of daytime distribution in relation to proposed intake.
	Light Experiment	06/20/96 07/12/96 07/24/96 08/21/96	420 kHz 420 kHz 420 kHz 420 kHz	Test response of M. relicta to long-term benthic light source.

TABLE 2.3.4-2: COMPARISON OF HYDROACOUSTIC DATA, AUGUST AND SEPTEMBER 1995 LAKEWIDE SURVEY

HYDROACOUSTIC DATA FOR STRATA 1-4

AUGUST 1995
TRANSECT	STRATUM 1 (dB)	STRATUM 2 (dB)	STRATUM 3 (dB)	STRATUM 4 (dB)
a	N/A	-69.74	-66.80	-70.23
b	N/A	-68.06	-66.49	-71.48
c	-70.28	-67.24	-64.80	-68.57
d	-69.32	-69.31	-67.1292	N/A
e	-72.48	-69.53	-61.7306	N/A
f	-100	-68.70	-73.7906	N/A
Average S_v	-78.02	-68.76	-66.79	-70.09
Density / mÆ3	0.206	3.73	6.93	2.46
Density / mÆ2	5.755	104.59	194.08	68.93

Kruskal-Wallis H Test for Significant Differences Among Strata
H = 8.38

Critical Value = x²_(0.05.3) = 7.815

Reject null hypothesis (H₀ = Strata are not significantly different). At least one stratum is different from at least one other.

STEP-WISE COMPARISON OF STRATA FOR AUGUST 1995	STRATUM 1 vs. STRATUM 2	STRATUM 1 vs. STRATUM 3	STRATUM 1 vs. STRATUM 4	STRATUM 2 vs. STRATUM 3	STRATUM 2 vs. STRATUM 4	STRATUM 3 vs. STRATUM 4
Difference between rank means	6.0	10.0	2.8	4.0	3.2	7.2
Critical value at a (0.15)	11.01	11.01	13.02	9.84	12.06	12.06

HYDROACOUSTIC DATA FOR STRATA 1-4

SEPTEMBER 1995
TRANSECT	STRATUM 1 (dB)	STRATUM 2 (dB)	STRATUM 3 (dB)	STRATUM 4 (dB)
a	N/A	-65.52	-65.31	-68.05
b	N/A	-67.29	-64.26	-69.39
c	-67.10	-66.80	-65.37	-67.37
d	-65.97	-65.27	-68.26	N/A
e	-64.94	-66.72	-66.82	N/A
f	-71.2075	-64.98	-71.19	N/A
Average S_v	-67.30	-66.10	-66.87	-68.27
Density / mÆ3	5.90	8.61	6.76	4.36
Density / mÆ2	165.3	241.1	189.3	122.0

Kruskal-Wallis H Test for Significant Differences Among Strata
H = 3.78

Critical Value = x²_(0.05.3) = 7.815

Accept null hypothesis (H₀ = Strata are not significantly different.)

dB = decibels

TABLE 2.3.4-3: STATISTICAL ANALYSES OF MYSIS RELICTA LAKEWIDE DISTRIBUTION

DATE		*STRATUM 1 M. relicta/m²*	STRATA 2,3,4M. relicta/m²
August 1995	Mean Median Standard Deviation Range n	65 38 50 34-123 3	94 94 47 8-172 9
Mann-Whitney U. U = 18 0.05(2)3.9 = 25 Groups are not significantly different.
September 1995	Mean Median Standard Deviation Range n	35 39 23 10-55 3	156 125 149 1-373 7
Mann-Whitney U. U = 14 0.05(2)3.7 = 20 Groups are not significantly different.
Spring 1996 (Unstratified)	Mean Median Standard Deviation Range n	74 64 67 0-277 54	86 79 63 0-241 58
Student's t-test (means) t = 0.98 < t_0.05(2)112 = 1.982. Means are not significantly different.
Spring 1996 (Samples from 20 m and Deeper)	Mean Median Standard Deviation Range n	103 92 60 11-277 38	93 82 62 9-241 54
Student's t-test (means) t = 0.77 < t_0.05(2)90 = 1.987. Means are not significantly different.

TABLE 2.3.4-4: DEPTH AND LIGHT LEVELS OF DAYTIME DISTRIBUTION OF MYSIS RELICTA

DATE	WEATHER	IRRADIANCE (LUX)	AVERAGE MEASURED COEFFICIENTS OF EXTINCTION	DEPTH AT LAYER OF MYSIS RELICTA	LIGHT LEVEL AT LAYER (LUX)
06/12/96	Sunny	94736	0.42	70 meters (m)	9.0 x 10^-8
06/20/96	Cloudy	36667	0.37	60 m	6.2 x 10^-4
07/24/96	Sunny	79056	0.63	72 m	2.0 x 10^-14
07/24/96	Cloudy	25326	0.48	72 m	9.1 x 10^-10
08/21/96	Sunny	89930	0.39	80 m	3.4 x 10^-9
08/21/96	Sunny	73389	0.41	80 m	1.8 x 10^-8

Note: The light level of the M. relicta layer was calculated from field recorded light levels and calculated coefficients of light extinction. Beer's Law states that I_z = I₀ × e ^-c×z, in which I_z is the light intensity at depth z, I₀ is the light intensity (irradiance) at the surface, and c is the coefficient of light extinction. While the coefficient of light extinction is reported as an average, the light level was calculated from extinction coefficients generated for 10 m depth bins (0-10 m, 10-20 m, etc). The deepest measured coefficient of extinction was extrapolated to the depth of the observed M. relicta layer. This step-down approach (light intensity at surface to light intensity at 10 m, light intensity at 10 m to light intensity at 20 m, etc.) represents a more accurate depiction of how light is transmitted in Cayuga Lake. See Appendix C-2 for calculations of extinction coefficients and light levels.

TABLE 2.3.4-5: WAVELENGTH-SPECIFIC EXTINCTION COEFFICIENTS AS MEASURED BY UFI AT STATION S11, JUNE 20, 1996

WAVELENGTH INTERVAL	AVERAGE EXTINCTION COEFFICIENTS - 0.5 - 4.5 METERS	AVERAGE EXTINCTION COEFFICIENTS - 1 - 23 METERS
300 - 800	0.795	0.336
400 - 700	0.765	0.337
300 - 350	1.823	0.153
350 - 400	1.940	0.286
400 - 450	1.272	0.515
450 - 500	0.879	0.402
500 - 550	0.664	0.312
550 - 600	0.604	0.302
600 - 650	0.815	0.517
650 - 700	1.012	0.563
700 - 750	1.441	0.458
750 - 800	2.921	0.297

TABLE 2.3.4-6: PERCENT OF HYPOLIMNION WITHDRAWN BY LSC (PERMIT CONDITIONS)

DESCRIPTION	JAN.	FEB.	MAR.	APRIL	MAY	JUNE	JULY	AUG.	SEPT.	OCT.	NOV.	DEC.
Total Lake Volume, billion cu. meters	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4	9.4
Hypolimnion Volume, billion cu. meters	0	0	0	0	0	6	5.5	5.1	4.8	4.2	3.6	0
LSC Pumped Volume, billion cu. meters Monthly Total Cumulative for Year Cumulative for Stratified Period	0.0017 0.0017 0	0.0016 0.0033 0	0.0017 0.0051 0	0.0020 0.0071 0	0.0027 0.0098 0	0.0052 0.0150 0.0052	0.0054 0.0204 0.0106	0.0054 0.0258 0.0161	0.0052 0.0310 0.0213	0.0027 0.0337 0.0240	0.0020 0.0357 0.0260	0.0017 0.0375 0
Percent of Total Lake Circulated Monthly Cumulative for Year	0.02 0.02	0.02 0.04	0.02 0.05	0.02 0.08	0.03 0.10	0.06 0.16	0.06 0.22	0.06 0.28	0.06 0.33	0.03 0.36	0.02 0.38	0.02 0.40
Percent of Hypolimnion Withdrawn Monthly Cumulative for Stratified Period	0 0	0 0	0 0	0 0	0 0	0.09 0.09	0.10 0.19	0.11 0.29	0.11 0.40	0.06 0.46	0.06 0.52	0 0

(¹⁾ Lake volume assumes constant lake level of 116 meters (381 feet). Source: Birge and Juday 1914.

⁽²⁾ Hypolimnetic volume calculated from the Environmental Feasibility Report - Bell Station Volume 1. January 1973, pp. 2-57. Volume estimated by averaging hypolimnetic volume calculated for the first and last day of each month.

⁽³⁾ LSC pumped volume calculated from permit flows as calculated in the Gryphon International Basis of Design document issued June 5, 1996 (BOD-General - 1.01). Calculated assuming maximum permit flows 24 hours/day.

⁽⁴⁾ Percentages have been rounded to the nearest hundredth. Percentages in tables are read as follows: The 0.02 percent of total lake volume pumped in January is two ten thousandths of the lake volume.

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