Data collected by and obtained from the MD Department of Natural Resources. Table 1 – Summary of vegetation present in Deep Creek*. For the purposes of discussion, these three macrophytes will be the focus to assess the varying ecological effects of SAV. Three species appear to dominate: a species complex of Water Milfoil ( Myriophyllum spp.), Broad-leafed Pondweed ( Potamogeton amplifoilus ), and Wild Celery or Tape Grass ( Vallisneria americana ). Vegetation surveys were performed by MD Department of Natural Resources (DNR) between 20 to track SAV movement and expansion in Deep Creek Lake (Table 1). It is intended to provide guidance for the Deep Creek Watershed Foundation as they tackle increases in SAV around the Lake. Other control methods areĭiscussed, but the focus will be water withdrawal (mechanical control). This review serves as an assessment of the effects of winter drawdowns, both positive and negative across various taxa. While rooted vegetation can provide shelter, habitat, and food for many organisms as well as oxygen through the process of photosynthesis, some plants pose threats to aquatic systems choking out native species. Submerged aquatic vegetation is defined as plants that are usually rooted in the bottom soil with the vegetative parts predominantly submerged. Macrophytes or submerged aquatic vegetation (SAV), if left unchecked, can create severe problems, turning once productive systems into eutrophic nightmares. In some instances, systems become overrun by these nuisance species which necessitates drastic measures be employed. Recreational boaters for example can easily introduce and spread such invaders unintentionally with movement of their vessels from waterbody to waterbody. Conditions among many of these lentic systems often lend themselves to invasions of aquatic nuisance species like Zebra Mussels ( Dreissena polymorpha ) and Hydrilla ( Hydrilla verticillata ).
In addition, many serve concurrently in more industrial or ecological roles as hydroelectric power sources or as flood control/management devices. Lakes and reservoirs are frequently developed into recreational havens for boaters and fisherman alike. Here, an overview is provided of the current SAV status of Deep Creek Lake, Maryland as well as an evaluation (literature review) of the potential effects of various control strategies (e.g., winter drawdowns) within the ecosystem, both biotic and abiotic. Understanding the role that these plants play in the ecology of a system is an important step to developing methods to control their unwanted spread. Carried by wind or waterfowl or (un)intentionally introduced by humans, SAV can quickly establish. What is the drawdown?Ī well has a calculated specific capacity of 30 gpm per foot and operates at a flow rate of 1.08 MGD.Macrophytes or Submerged Aquatic Vegetation (SAV) are often part of many aquatic systems. The well operates at a constant 1,500 gpm. What was the average specific capacity for the year?Ī well has a specific capacity of 42 gpm per foot. The pumping level averaged 55 ft bgs for half the year and 68 ft bgs the other half. For half the year the static water level was 25 ft bgs and half the year 42 ft bgs. If the original drawdown was 42 ft what is the current specific capacity?Ī well pumped 538 AF over a one year period averaging 10 hours of operation per day. In addition, the drawdown has decreased by 15%. The efficiency of the well has dropped 35%. When a well was first constructed it was pumping 1,750 gpm. After 3 hours of operation, the well produced 279,000 gallons. What is the pumping level of the well?Ī well has an hour meter attached to a water meter totalizer. A drawdown has been calculated out to be 65 ft. If the drawdown on this well is 44 ft and the pumping level is 80 ft bgs, what is the static water elevation above sea level?Ī deep well has a static water level of 122 ft bgs.
What is the drawdown?Ī groundwater well has a base elevation of 1,125 ft above sea level. \)Ī well has a static water level of 23 ft bgs and a pumping level of 58 ft bgs.
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