The proper design of an effective aeration system requires considerations of many factors, including pond shape and depth, pond volume, pond ecological health, and pond water quality. These factors are addressed below:
PRIMARY DESIGN FACTORS
• Pond Shape and Depth: A drawing would be helpful here, including the identification of deep holes and shallow ledges or islands.
• Approximate Pond Surface Area: This factor may be determined by approximating a length and width, or a diameter, or a combination of both.
• Pond Volume: This factor can be approximated by multiplying the surface area by 1/2 of the depth at the deepest point.
• Pond Ecological Health: This parameter can vary from a relatively healthy pond, which is clear and has minimal problems with nuisance algae, to one that is discolored and has major problems such as nuisance algae, noxious odor, and death of fish or other aquatic organisms. Naturally, it is important to determine the pond’s condition, prior to sizing the air pump and aeration diffusers.
• Pond Water Quality: The pond’s water quality can be determined by visual observation and simple tests, using kits purchased from a pet store or department. Notable parameters are temperature ranges, pH, nitrate-nitrogen, ammonia-nitrogen, total nitrogen, total phosphorus, and dissolved oxygen. More extensive tests should be conducted with problem ponds, including biological oxygen demand (BOD), to determine daily amount of oxygen needed with aeration; total organic carbon (TOC), to determine organics in the water column that contribute to discoloration; pesticides and herbicides, to establish potential harm from agriculture runoff and aerial fallout; and NPK levels to determine if fertilizer inputs are contributing to the deterioration of the pond.
• Pond Oxygen Requirement: This factor may be directly determined with evaluations of a pond’s biological oxygen demand (BOD) or by oxygen readings, or indirectly by observations of the pond’s ecological health. This information provides the designer with information to establish a proper air flow to the pond. When BOD data is available, oxygen flow would range from 1-to-2 lbs of Oxygen to 1 lb of BOD to be removed, depending on the status of the pond.
• Appropriate Pond Turn-Over Rate: This rate can vary from one turn-over per day for a healthy pond to one per hour for a seriously deteriorated pond. In the later case, the pond could contain high levels of organic sludge, as well as various toxins from agricultural runoff and other sources.
• Location and Type of Power Outlet: It is important to determine the type of available power, in terms of volts and phase (single or triple phase). Also, the location of the power outlet and its distance from the pond are important in order to determine proper distances for the air lines. In this regard, a drawing would be helpful, showing the proposed position of the air line, connecting the air compressor with the edge of the pond.
• Other Considerations: Many other ecological factors may be addressed, such as aesthetics, timing of the aeration, late-summer fish kill, and winter fish health.
1 HP, 4 Valve System:
BASIC DESIGN FEES
• Our basic fee for designing an aeration system is: a minimum of $75, or 10% of the price of the equipment, whichever is greater. The shipping price is not included in this determination.
• The customer should also provide: 1) a drawing or adequate description of the pond, so that proper allowances can be made for pond dimensions and pond health, 2) distances from the power outlet to the pond shore, and 3) the type of power to be provided.
• Installation of the Aeration System: The customer is responsible for installing, or contracting for, the installation of the system. This function may be accomplished by themselves, with or without the help of sub-contractors, or by identifying a proper landscape contractor or pond professional to install the system for them.