Looking Glass River Watershed Management Plan - Greater ...

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It should also be noted that the suggested relationship between impervious cover and the expected stream quality was developed for urban subwatersheds (typically with a drainage area less than 10 square miles) and may not accurately reflect conditions for agricultural areas. Critical Areas The critical areas for altered hydrology are the highest developed areas as estimated by the impervious cover analysis. The more imperviousness associated with a given site, the higher the flashiness, the greater the peak flows will be increased, and the greater the total runoff volume due to the reduction in evaporation, transpiration, infiltration and storage. All impervious areas which are directly connected to a storm water conveyance system (often referred to as DCIA or directly connected impervious areas) should be considered for restoration potential. The areas with a higher percent impervious may be given higher priority based on their potential to more adversely affect the receiving water body. Likewise impervious areas which have a high potential for containing other pollutants should also be given a higher priority over impervious surfaces with no other pollutants. When considered on the subwatersheds level those subwatersheds which have a percent imperviousness greater than or equal to 10 percent are considered the critical areas. Three categories are provided: 1. Urban Drainage as classified as impervious cover greater than 60 percent. No subwatersheds were in this category. 2. Non-Supporting as classified as impervious cover between 25 and 60 percent. No subwatersheds were in this category. 3. Impacted as classified as impervious cover between 10 and 25 percent. The following subwatersheds are included in this category; Prairie and Gunderman (20.6 percent). Summer Drain (18.7 percent), Upper Remey Chandler (14.0 percent), Lower Remey Chandler (12.1 percent), and Looking Glass C (10.2 percent). Keep in mind that regardless of the overall subwatershed area weighted percent impervious, all directly connected impervious areas are good candidates for restoration potential. For protection consideration, critical areas are considered those that have an impervious cover less than 10 percent. These are generally the undeveloped parcels or parcels with open green space included. The highest priority is given to the undisturbed tracks of land. This also includes protecting wetlands. Improvement or Protection Goal No specific target is set for the impervious cover analysis. The desire is to see no “effective” increase in hydraulically significant percent impervious. Hydraulically significant impervious areas are those impervious areas directly connected to the receiving water. The intent is not to limit development and consequently the impervious area, but rather when development occurs to do so in an environmentally friendly manner such as the premise of low impact development techniques 5-14 Looking Glass River Watershed April 2007
The target for the wetlands and floodplains is to see no net loss of additional storage within the watershed. Monitoring Progress Use of the R-B Index will be used at the USGS gauging station to monitor progress over time. Trending of the Index should be looked at on no less than a five year basis and not annually. Progress will also be monitored through the other indicator parameters as identified in the Indicator section. Improvement Ideas In order to reduce the flashiness of a stream the high impervious cover areas may be retrofitted to slow down the runoff discharge and promote the use of infiltration and evapotranspiration. This may be accomplished through the use of bioretention and infiltration practices such as rain gardens, green roofs, porous pavement and vegetated swales. The use of detention facilities is appropriate to reduce the peak discharge however these types of facilities do not generally reduce the total volume of runoff discharged and therefore are not as effective as other means. For new development and significant redevelopment areas development standards should be put into place promoting the use of low impact development techniques. Public education and input should be included in formulating development standards. Directly related to the flow regime stemming from high impervious areas is the ability and tendency of the runoff to pick up other pollutants and discharge them to the receiving waters. In order to minimize the impact of this, any retrofit projects undertaken to reduce the discharge should also include best management practices to reduce the pollutants carried by the storm water. In addition, good housekeeping practices and education should be included to reduce the opportunity for the pollutants to come in contact with the storm water. The degradation and loss of storage should also be thwarted by first completing inventories and assessments of the existing wetlands and floodplains and then providing protection measures. In addition, those areas capable of being restored should be prioritized and worked on as possible. Other Stressors Aside from previously identified stressors, other pollutants are present in the watershed. A list of pollutants, their sources and causes was developed for the watershed. Each pollutant is grouped into one of five categories of pollutants below; oxygen-depleting, physical, toxic, thermal or `other’ followed by a description of the pollutant and possible sources and causes. Soil Erosion: Tetra Tech 2004. Oxygen-Depleting Pollutants Oxygen-depleting pollutants generally are, or cause, organic materials that require a large amount of oxygen for decomposition. Many organisms living in water systems require the presence of oxygen (aerobic organisms) for survival, such as fish and zooplankton, and will suffocate in oxygen-deficient systems. Common oxygen-depleting pollutants of concern in the Looking Glass River watershed are listed below. Section 5: Stressor Summary 5-15
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GLRC on Phase II Looking Glass Rive
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P:\1666001\09 Looking Glass WMP\WMP
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Table of Contents Organization of t
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SECTION 10 - Plan Sustainability In
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FIGURES Figure 1-1 Watershed Locati
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Organization of the Plan This plan
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9. Evaluation and Revision Section
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! ! ! ! ! ! Forest Hill ! ! ! ! ! !
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The goals and objectives were then
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Looking Glass Watershed The Looking
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• methods for evaluation of progr
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References Center for Watershed Pro
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The majority of wetlands in the wat
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commonly classified as hydrologic s
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Page 38 and 39: Significant Natural Features to be
Page 40 and 41: References Centers for Disease Cont
Page 42 and 43: 3. Water Quality Conditions People
Page 44 and 45: sanitary sewer treatment system has
Page 46 and 47: Section 3: Water Quality Conditions
Page 48 and 49: Data Analysis Tetra Tech summarized
Page 50 and 51: ! ! ! ! ! ! Forest Hill ! ! ! ! ! !
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Page 54 and 55: Table 3-4 explains the problems fou
Page 56 and 57: Vermillion Creek Assessment Vermill
Page 58 and 59: Volunteers identify the species bas
Page 60 and 61: Watershed Fish Consumption The Mich
Page 62 and 63: The coldwater fishery use does not
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Page 66 and 67: Interpretation of Watershed Conditi
Page 68 and 69: 4. Community Outreach A watershed p
Page 70 and 71: Public Comment on Draft Plan A draf
Page 72 and 73: Public Education Plan Public educat
Page 74 and 75: determining goals and desires for t
Page 76 and 77: Table 5-1 Status of Designated Uses
Page 78 and 79: Sources The main sources of sedimen
Page 80 and 81: the time for the specified month. (
Page 82 and 83: Altered Hydrology Stream flows vary
Page 84 and 85: day as it is at a USGS gauging stat
Page 86 and 87: Figure 5-2 R-B Index at Eagle (USGS
Page 90 and 91: Detergents are becoming a serious t
Page 92 and 93: Physical Pollutants Physical pollut
Page 94 and 95: Oil and grease are often referred t
Page 96 and 97: Table 5-14 Pesticide: Sources and C
Page 98 and 99: Introduction 6. Goals and Objective
Page 100 and 101: equirements, some objectives go bey
Page 102 and 103: Goal 3: Encourage Water Quality Fri
Page 104 and 105: general health of wetlands, primary
Page 106 and 107: References DAS Manufacturing. “Cu
Page 108 and 109: Several programs are available loca
Page 110 and 111: Better Site Design Better site desi
Page 112 and 113: Non-Storm Water Discharges Non-stor
Page 114 and 115: producers to meet personal objectiv
Page 116 and 117: Michigan Turfgrass Environmental St
Page 118 and 119: 8. Action Plan Source: Basetree, 20
Page 120 and 121: Table 8-1 Benefits of Goals No Goal
Page 122 and 123: 9. Evaluation Mechanisms “Not eve
Page 124 and 125: Evaluation Mechanisms Level One - A
Page 126 and 127: Program Implementation Program impl
Page 128 and 129: The MDEQ/MDNR have conducted analyt
Page 130 and 131: Assessing the evaluation mechanisms
Page 132 and 133: Goal 3: Encourage Water Quality Fri
Page 134 and 135: Goal 6: Protect and Increase Wetlan
Page 136 and 137: Evaluation Action Plan At the end o
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Evaluation Mechanisms Municipal Sta
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The committee defined appropriate w
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“It is the purpose of this Memora
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each other about how to protect and
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A-2 Looking Glass River Watershed A
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B-2 Looking Glass River Watershed A
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C-2 Looking Glass River Watershed A
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D-2 Looking Glass River Watershed A
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Appendix E Road Stream Surveys Appe
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Appendix F Vermillion Creek Corresp
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