Pond management

Asked July 26, 2020, 11:33 AM EDT

I have a half acre size pond but would like to confirm the size and also develop a schedule of herbicide applications to control milfoil and algae growth. Thank you.

Allegan County Michigan

4 Responses


The best way to confirm the area of you pond is to use one of many online mapping tools such as Google Earth or Acme (http://acme.com/planimeter/). Either will give you the perimeter and area of your pond. If the pond is a standard shape you can also just use formulas such as circle (pi*radius squared) or rectangle (length x width). To get pond volume, you'll need to multiply the area times the average depth. A somewhat quick way of calculating average depth is to make many measurements along two transects (width and length) of the pond and then calculate an average. Here's a web site that does the overall calculations for you, but you still need to determine the average depth: https://concalculator.com/pond-volume-calculator/#Irregular_Pond.
For the herbicide application, make sure you follow the label. Hope this helps you find the dimensions for your pond.

I thank you for pond size calculators. I know this is essential to determine algaecide applications. Can the extension service recommend algaecides and other treatments for pond maintenance?

Pond maintenance is so dependent on what one wants from the pond. There's no one answer fits all. Michigan's EGLE has a lot of information on Aquatic Nuisance Control at https://www.michigan.gov/egle/0,9429,7-135-3313_3681_3710---,00.html, including various chemicals that can be used for removing algae and other aquatic plants. Two good resources for Pond Management are Michigan Extension's: Managing Michigan Ponds for Sports Fishing at https://shop.msu.edu/product_p/bulletin-e1554.htm, but it costs $5.00 or Ohio's DNR's Pond Management at https://freshwater-aquaculture.extension.org/wp-content/uploads/2019/08/OhioPondManagement.pdf which is free.

Thank you! I’ll look into the website and let you know.