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

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2.2 RAINFALL AND STREAMFLOWThe amount of rain that falls on a watershed in a given year can have important effectson streamflow and water quality. In the Peace and Myakka River watersheds, annualrainfall and streamflow levels varied dramatically during water years 1998-2001. Totalannual rainfall and average annual streamflow at three monitoring stations are shown inFig. 2.A strong El Niño event occurred during the 1998 water year, and total annual rainfall inthat year was substantially higher than the long-term (1950–2001) mean value at eachstation. Annual mean streamflows were also quite high during the 1998 water year,exceeding 200% of the long-term (1950-2001) values at each station (Fig. 2).Rainfall returned to near-average or below-average levels in water years 1999-2001,and annual mean streamflow declined in response to the lower rainfall (Fig. 2). Annualstreamflow at the Peace River-Bartow station remained far below its long-term meanduring water years 1999-2001, falling to less than 25% of its long-term value in 2001.Annual flows at the other stations — the Peace River at Arcadia and Myakka River nearSarasota — fell to between 30% and 60% of their long-term means during water year2000, but rebounded in 2001 to levels near or above the long-term means.8
ANNUAL RAINFALLANNUAL STREAMFLOW% OF LONG-TERM MEAN300%200%100%0%Peace River at Bartow1998 1999 2000 2001% OF LONG-TERM MEAN300%200%100%0%Peace River at Arcadia1998 1999 2000 2001% OF LONG-TERM MEAN300%200%100%0%Myakka River near Sarasota1998 1999 2000 2001Fig. 2. Annual rainfall and stream discharge at three monitoring locationsin the Peace and Myakka River watersheds9
Page 1 and 2: Peace and Myakka RiverWater Quality
Page 3 and 4: CONTENTSExecutive Summary .........
Page 5 and 6: REPORT ORGANIZATION AND SCOPEThe pr
Page 7 and 8: “Good” water quality conditions
Page 9 and 10: The primary manmade influences incl
Page 11 and 12: Yields of total suspended solids (T
Page 13 and 14: are transported from fresh to more
Page 15 and 16: LIST OF FIGURESFigure 1. Map showin
Page 17 and 18: 1.0 INTRODUCTION1.1 BACKGROUNDDurin
Page 19 and 20: maintaining water quality at levels
Page 21 and 22: on the initial day of field work; t
Page 23: Figure 1. Locations of USGS gaging
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 and 72: ecorded at least once during most y
Page 73 and 74: 5.0 REFERENCESCanfield, D., and M.
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
Page 123 and 124:
Near-surface TSS (mg/L)SITE WY N Mi
Page 125 and 126:
Near-surface TSS (mg/L)SITE WY N Mi
Page 127 and 128:
Near-surface turbidity (NTU)SITE WY
Page 129 and 130:
Secchi depth (m)SITE WY N Minimum 2
Page 131 and 132:
Secchi depth (m)SITE WY N Minimum 2
Page 133 and 134:
Near-surface pHSITE WY N Minimum 25
Page 135 and 136:
DO (mg/L) - all depthsSITE WY N Min
Page 137 and 138:
DO (mg/L) - all depthsSITE WY N Min
Page 139 and 140:
Near-surface PO 4 —P (mg P/L)SITE
Page 141 and 142:
Near-surface DIN (mg N/L)SITE WY N
Page 143 and 144:
Near-surface DIN (mg N/L)SITE WY N
Page 145 and 146:
Near-surface chlorophyll-a (µg/L)S
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