Rocky Brushy Creek Watershed Mgmt. Plan (2007) -- Part 2

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EXISTING NATURAL SYSTEMS CONDITIONS8.5 Natural Systems Issues and Areas of Concern8.5.1 Habitat Loss, Degradation, and FragmentationAs described above, the Rocky/Brushy Creekwatershed was once composed of a variety ofupland and wetland habitats. Within the last century,many large tracts have been converted from naturalland features to agricultural uses, predominantly inthe northeastern and southern portions of thewatershed. Based on 2004 SWFWMD land usedata, approximately 64% of the watershed has beenaltered by human activities with approximately 8.7%of the watershed impacted by agricultural activitiesand approximately 46% developed for urban,suburban, commercial, industrial, and mining uses. Lands in a near-natural condition (uplands,wetlands) comprise an estimated 36% of the watershed, although most native habitats aredisturbed and degraded to some degree by agricultural practices, urban development, or waterproduction activities in the watershed.Despite these alterations and impacts to natural systems, some large tracts containing freshwaterwetlands, hardwood swamp, and saltwater marsh remain undeveloped in the watershed.Protection is provided by means of regulatory programs of SWFWMD and EPC and by theacquisition of 2,416 acres (6% of the watershed) critical to preservation and restoration.Habitat FragmentationHabitat fragmentation is defined as the break-up of a continuous landscape containing largepatches into smaller, numerous, less connected patches. To measure habitat fragmentation withinthe watershed, ArcView was used to join contiguous natural habitat polygons from SWFWMD’s2004 land use layer. The polygons with FLUCFCS code of 3000, 4000, 5000, 6000, and 7000(natural systems designations) were dissolved to form contiguous polygons throughout eachwatershed. The areas of these contiguous polygons were then calculated and compared to theoverall area of a given watershed. If one or more contiguous polygons represented a significantproportion of a watershed (i.e., greater than 75%), the watershed was categorized as havingrelatively little fragmentation. Alternately, if a watershed was comprised of several small contiguousnatural systems polygons and few large contiguous polygons, then the area was categorized asbeing highly fragmented. Large numbers of small polygons represent a high level of fragmentation,while small numbers of large polygons represent a low level of fragmentation (Table 8-5).8-20Rocky/Brushy Creek Watershed Management Plan
State Road 54Pasco CountyHillsborough CountyVan Dyke RdLutz Lake Fern RdVeterans ExpyDale Mabry HwyUnited States Highway 41Rawls RdRace Track RdMobley RdCitrus Park DrBearss AveSheldon RdLinebaugh AveGunn HwyMemorial HwyHillsborough AveAnderson RdLegendRoadsHydrographyCounty BoundarySubbasinsContiguous Land Use0 6,000 12,000 FeetContiguous Land Use in the Rocky/Brushy Creek WatershedFigure8-5
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CHAPTER 8: EXISTING NATURAL SYSTEMS
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CHAPTER 8Using the data described i
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CHAPTER 8Land uses and cover types
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LegendRoadsHydrographyAgriculturalB
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CHAPTER 8Hardwood conifer mixed for
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CHAPTER 8Mangrove swamps (612)The a
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CHAPTER 8consist solely of mud into
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CHAPTER 8use. Urban inactive land i
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CHAPTER 8enhance drainage for rows
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State Road 54Pasco CountyHillsborou
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CHAPTER 8buffer zones should be est
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CHAPTER 8Factors such as the width
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CHAPTER 88.5.4 Biological Indicator
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Page 35 and 36: CHAPTER 8Table 8-9Protected Animal
Page 37 and 38: CHAPTER 8problems; and8. informing
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Page 41 and 42: CHAPTER 8Wild TaroThe wild taro is
Page 43 and 44: CHAPTER 8The FDEP Bureau of Land Ac
Page 47 and 48: CHAPTER 8Funding Program (NRTFP). T
Page 49 and 50: CHAPTER 8Hillsborough CountyWetland
Page 51 and 52: CHAPTER 84. Hillsborough County Str
Page 53 and 54: CHAPTER 8innovative, interdisciplin
Page 55 and 56: CHAPTER 8• Developing and support
Page 57 and 58: CHAPTER 88.9 BibliographyThe attach
Page 59 and 60: CHAPTER 8Southwest Florida Water Ma
Page 61 and 62: CHAPTER 8Chinese laddere brake, Pte
Page 63 and 64: CHAPTER 8: EXISTING NATURAL SYSTEMS
Page 65 and 66: CHAPTER 8Using the data described i
Page 67 and 68: CHAPTER 8Land uses and cover types
Page 69 and 70: LegendRoadsHydrographyAgriculturalB
Page 71 and 72: CHAPTER 8Hardwood conifer mixed for
Page 73 and 74: CHAPTER 8Mangrove swamps (612)The a
Page 75 and 76: CHAPTER 8consist solely of mud into
Page 77 and 78: CHAPTER 8use. Urban inactive land i
Page 79 and 80: CHAPTER 8enhance drainage for rows
Page 81: State Road 54Pasco CountyHillsborou
Page 85 and 86: CHAPTER 8buffer zones should be est
Page 87 and 88: CHAPTER 8Factors such as the width
Page 91 and 92: CHAPTER 88.5.4 Biological Indicator
Page 95 and 96: CHAPTER 8The presence of wildlife o
Page 97 and 98: CHAPTER 8Table 8-9Protected Animal
Page 99 and 100: CHAPTER 8problems; and8. informing
Page 101 and 102: CHAPTER 8the entire surface of some
Page 103 and 104: CHAPTER 8Wild TaroThe wild taro is
Page 105 and 106: CHAPTER 8The FDEP Bureau of Land Ac
Page 109 and 110: CHAPTER 8Funding Program (NRTFP). T
Page 111 and 112: CHAPTER 8Hillsborough CountyWetland
Page 113 and 114: CHAPTER 84. Hillsborough County Str
Page 115 and 116: CHAPTER 8innovative, interdisciplin
Page 117 and 118: CHAPTER 8• Developing and support
Page 119 and 120: CHAPTER 88.9 BibliographyThe attach
Page 121 and 122: CHAPTER 8Southwest Florida Water Ma
Page 123 and 124: CHAPTER 8Chinese laddere brake, Pte
Page 125 and 126: CHAPTER 9: WATER SUPPLY9.1 Overview
Page 127 and 128: CHAPTER 9Hillsborough County Compre
Page 129 and 130: CHAPTER 9Figure 9-1A Tampa Bay Wate
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CHAPTER 9Total per capita water use
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CHAPTER 9Groundwater levels in the
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CHAPTER 9Furthermore, with increasi
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CHAPTER 9The recovery strategy invo
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CHAPTER 9Southwest Florida Water Ma
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Rocky Brushy Creek Watershed Mgmt. Plan (2007) -- Part 2

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