Baldwin County Wetland Conservation Plan - Alabama Department ...

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Baldwin County Wetland Conservation Plan Final Summary Document 1. Is the observed wetland within the zone of influence (designated wellhead protection area for the 10 year time of travel capture zone) of a major groundwater pumping center (i.e. withdrawal rates of three to four million gallons a day)? Rationale: Historically, wetlands in the Project area served as aquifer discharge areas. Recent development, however, has increased the need for large groundwater pumping stations in the Project area. These pumping stations draw down water in the aquifer thus forcing the wetland to engage in an aquifer recharge function. So the wetlands within the zone of influence become important in replenishing aquifer supplies and filtering contaminants before they reach the water supply. Since this variable deals with a human- induced condition, a “no” response will not count against a particular wetland. Rather, it will serve as a “bonus” question allowing a wetland extra consideration if this variable applies. This variable was identified remotely through digital maps provided by the EPA. Data Column: wellhead; 2 point bonus 101
Baldwin County Wetland Conservation Plan Final Summary Document Riverine Functional Assessment Model 16 total points; 11 actual; 5 bonus; 1 possible subtraction Functional Assessment Ranges: 80% Conservation Wetlands This functional assessment model will be applied to swamps and hardwood bottoms and fresh marshes associated with riparian systems. General Items: Questions of Function: Floodwater Storage Question 1: Is the observed wetland within the 100 year floodplain? Rationale: If the wetland is in a topographic position which receives frequent flood events (as indicated by occurring within the 100 year floodplain), then the wetland is likely to perform the floodwater storage function at a higher level than a wetland which is outside an area of frequent flooding. This variable was identified remotely through digital floodplain maps from FEMA. Data Column: Flood; 1 point Question 2: Is the observed wetland one (1) acre or larger in size? Rationale: Wetland size was considered to be one of the most important factors in terms of water storage. As such, this variable has been weighted to consider wetlands of one (1), ten (10) and one hundred (100) acres in size. Wetlands of this size will have a significant water storage capacity and would be of higher functionality than smaller wetlands. Due to scale of mapping, an acre is approximately the smallest mapping unit which would consistently show up on the final map products and thus is the smallest area which was considered for this variable. This variable was identified remotely through digital NWI (NWI) maps. Data Column: Acres_Rate; 1 point Question 3: Is the observed wetland ten (10) acres or larger in size? Rationale: See question # 2. Data Column: Acres_Rate; 1 point (for a total of 2 in the column) Question 4: Is the observed wetland one hundred (100) acres or larger in size? Rationale: See question #2. Data Column: Acres_Rate; 1 point (for a total of 3 in the column) Question 5: Is the water regime of the observed wetland either intermittently exposed (G), semipermanently flooded (F), seasonally flooded (C), or temporarily flooded (A)? 102
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The Baldwin County Wetland Conserva
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3.2.3.2. Acquisition of GIS data la
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. List of Acronyms 1. ADCNR........
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d. Executive Summary The objective
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Baldwin County Wetland Conservation
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