Peace and Myakka River Water Quality Summary 2002 - Southwest ...

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NEAR-SURFACE DINAnnual median near-surface DIN concentrations ranged between 0.02 and 0.52 mg N/Lat the tidal Myakka River stations, and between 0.03 and 0.40 mg N/L at the tidal PeaceRiver stations (Appendix B). Median concentrations appear to vary inversely withsalinity in both river systems.If 0.01 mg DIN/L — which was the effective detection limit for DIN forms in the Districtmonitoring program for DIN forms, and the mid-range of potential N limitation valuesdiscussed by Chapra 1997 — is used to estimate the threshold for N limitation inphytoplankton, it appears that N availability may have limited phytoplankton productivityat several of the tidal river stations sampled during 1993-2000. DIN concentrationsbelow the laboratory detection limit were observed during at least one sampling event ateach station. The 25 th percentile value was equal to the detection limit in one or morewater years at each station, indicating that DIN concentrations equal to or less than thedetection limit were observed on 25% of the sampling dates at the station during thatyear.4.3 CHLOROPHYLL-aChlorophyll-a concentrations, which provide estimates of phytoplankton biomass in thewater column, are helpful indicators of a waterbody’s trophic state. A summary of nearsurfacechlorophyll-a concentrations observed at the tidal Peace and Myakka Rivermonitoring stations is shown in Appendix B. Annual median values ranged between thelaboratory detection limit (1.0 µg/L) and 13 µg/L at the tidal Myakka stations andbetween 2.3 and 10.6 µg/L in the tidal Peace. The statewide median chlorophyll-aconcentration for Florida estuaries, as reported by Freidemann and Hand (1989), is 8.5µg/L.Algal blooms (indicated by chlorophyll-a concentrations > 20 µg/L) occurred at everystation at some time during the monitoring period. Pronounced blooms, with chlorophyllconcentrations > 50 µg/L, were observed at three sites (CH-002, CH-02B, and CH-004).Annual mean chlorophyll-a concentrations observed at several stations during wateryears 1994-2000 exceeded 11 µg/L, a value that has been proposed by the State ofFlorida as representative of potentially impaired water quality conditions in the State’sestuarine waters. Stations and years where the proposed impairment level wereexceeded include:• CH-002 (water years 1995, 1999)• CH-02B (1995, 1998, 1999)• CH-029 (1995, 1996)• CH-004 (1994, 1995, 1996, 1999)• CH-05B (1999)• CH-005 (1994).56
5.0 REFERENCESCanfield, D., and M. Hoyer. 1988. Regional geology and the chemical and trophic statecharacteristics of Florida lakes. Lake and Reservoir Management 4:21-31.Charlotte Harbor Environmental Center (CHEC). 1999. Annual report on water qualitystatus and trends in the Peace and Myakka River basins. Charlotte Harbor NationalEstuary Program. North Ft. Myers, FLCharlotte Harbor Environmental Center (CHEC). 2000. Annual report on water qualitystatus and trends in the Peace and Myakka River basins. Charlotte Harbor NationalEstuary Program. North Ft. Myers, FLCharlotte Harbor Environmental Center (CHEC). 2001. Annual report on water qualitystatus and trends in the Peace and Myakka River basins. Charlotte Harbor NationalEstuary Program. North Ft. Myers, FLCoastal Environmental, Inc. 1995. Estimates of total nitrogen, total phosphorus, andtotal suspended solids loadings to Charlotte Harbor, Florida. Southwest Florida WaterManagement District. Tampa, FLCoastal Environmental/PBS&J, Inc. 1998. Tree mortality assessment of the upperMyakka River watershed. Southwest Florida Water Management District. Tampa, FLCochran, W.G. 1977. Sampling Techniques (3 rd Ed). Wiley. New York, NYFraser, T.H. 1991. The lower Peace River and Horse Creek: flow and water qualitycharacteristics, 1976-1986. pp 143-185 in R. Livingston (ed.) The Rivers of Florida.Springer-Verlag. NY, NYHammett, K. M. 1987. Land use, water use, streamflow, and water-qualitycharacteristics of the Charlotte Harbor inflow area, Florida. U.S. Geological SurveyOpen-File Report 87-472. Tallahassee, FLHand, J., J. Col, and E. Grimison. 1994. Southwest Florida district water quality: 1994305(b) technical appendix. Florida Department of Environmental Protection,Tallahassee, FLHand, J., J. Col, and L. Lord. 1996. Southwest Florida district water quality: 1996305(b) technical appendix. FDEP, Bureau of Surface Water Management.Tallahassee, FLLowrey, S.S., K.J. Babbitt, J.L. Lincer, S.J. Schropp, F.D. Calder, H.L. Windom, R.B.Taylor, and T. Hull. 1990. Myakka River Basin project: A report on physical andchemical processes affecting the management of the Myakka River Basin. FDER,Office of Coastal Management. Tallahassee, FL57
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Peace and Myakka RiverWater Quality
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CONTENTSExecutive Summary .........
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REPORT ORGANIZATION AND SCOPEThe pr
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“Good” water quality conditions
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The primary manmade influences incl
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Yields of total suspended solids (T
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are transported from fresh to more
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LIST OF FIGURESFigure 1. Map showin
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1.0 INTRODUCTION1.1 BACKGROUNDDurin
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maintaining water quality at levels
Page 21 and 22: on the initial day of field work; t
Page 23 and 24: Figure 1. Locations of USGS gaging
Page 25 and 26: ANNUAL RAINFALLANNUAL STREAMFLOW% O
Page 27 and 28: For this study, annual average WQI
Page 29 and 30: • Big Slough Canal near Myakka Ci
Page 31 and 32: Table 2. Annual WQI values for non-
Page 33 and 34: Peace River at Zolfo Springs (USGS
Page 35 and 36: Horse Creek near Myakka Head (USGS
Page 37 and 38: Myakka River near Sarasota (USGS ga
Page 39 and 40: 3.0 CONSTITUENT LOADS AND YIELDSEst
Page 41 and 42: Table 3. Estimated annual TN loads
Page 43 and 44: Table 5. Estimated annual NO 2+3 -N
Page 45 and 46: Table 7. Estimated annual TP loads
Page 47 and 48: Table 9. Estimated annual TSS loads
Page 49 and 50: Myakka City gaging station (in wate
Page 51 and 52: PEA CE CREEK CANAL nr WAHNETASADDLE
Page 53 and 54: PEACE CREEK CANAL nr WAHNETASADDLE
Page 67 and 68: ###TidalMyakkaRiverTidalPeaceRiverS
Page 69 and 70: Median color values for Florida riv
Page 71: ecorded at least once during most y
Page 75 and 76: Water Quality Conditionsand Polluta
Page 77 and 78: TURBIDITY (NTU), BY STATION AND WAT
Page 79 and 80: TURBIDITY, BY STATION AND WATER YEA
Page 81 and 82: TSS, BY STATION AND WATER YEARGAGE_
Page 83 and 84: COLOR (PCU), BY STATION AND WATERGA
Page 85 and 86: COLOR, BY STATION AND WATER YEARGAG
Page 87 and 88: pH, BY STATION AND WATER YEARGAGE_N
Page 89 and 90: SPEC. COND. (uS/CM), BY STATION AND
Page 91 and 92: SPEC. COND., BY STATION AND WATER Y
Page 93 and 94: DO, BY STATION AND WATER YEARGAGE_N
Page 95 and 96: CHLA [MONOCHROMATIC, uG/L], BY STAT
Page 97 and 98: CHLA [MONOCHROMATIC], BY STATION AN
Page 99 and 100: NH4-N, BY STATION AND WATER YEARGAG
Page 101 and 102: NO23-N (MG N/L), BY STATION AND WAT
Page 103 and 104: NO23-N, BY STATION AND WATER YEARGA
Page 105 and 106: TKN, BY STATION AND WATER YEARGAGE_
Page 107 and 108: PO4-P (MG P/L), BY STATION AND WATE
Page 109 and 110: PO4-P, BY STATION AND WATER YEARGAG
Page 111 and 112: TP, BY STATION AND WATER YEARGAGE_N
Page 113 and 114: TOC (MG/L), BY STATION AND YEARGAGE
Page 115 and 116: TOC, BY STATION AND YEARGAGE_NUM WY
Page 117 and 118: Near-surface salinity (ppt)SITE WY
Page 119 and 120: Near-surface salinity (ppt)SITE WY
Page 121 and 122: Near-surface color (PCU)SITE WY N M
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Near-surface TSS (mg/L)SITE WY N Mi
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Near-surface TSS (mg/L)SITE WY N Mi
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Near-surface turbidity (NTU)SITE WY
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Secchi depth (m)SITE WY N Minimum 2
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Secchi depth (m)SITE WY N Minimum 2
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Near-surface pHSITE WY N Minimum 25
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DO (mg/L) - all depthsSITE WY N Min
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DO (mg/L) - all depthsSITE WY N Min
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Near-surface PO 4 —P (mg P/L)SITE
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Near-surface DIN (mg N/L)SITE WY N
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Near-surface DIN (mg N/L)SITE WY N
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Near-surface chlorophyll-a (µg/L)S
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