We keep down pipes on our spillway pipes just for this reason. We only have one without it and we peel a turlte off about weekly.
I like to think its for the turtles instead of just to keep the pipe flowing anyway.
Down pipes are big pipes coming of the spillway pipes that stick up past the height of the dam. They provide a way for air to enter the pipe incase something closes of end of it allowing the object, which is most of the time a large turtle, to swim away once the pipe fills with air and equalizes pressure. Another thing we put on the end is a cone made out of suckerrod, essentially tempered smoot rebar thats 3/4 of an inch in diamater that prevents anthing from getting to the pipe to create a seal. These two things greatly reduce the damage to flood spillways and to the dam itself.
Of course our ponds are 4-5 acres in size, One has 2 10" spillway pipes with one that runs most of the time as it is spring fed. However I have seen an excess of nearly 15-20,000 gallons entering it a minute before when it rains hard. Most days its probably around 500gpm.
Any way moral of this is I would advise adding a cone as it will keep large particles such as leaves, fish, and turtles from reaching your pre-filter and keeping your flow rate high.
I like to think its for the turtles instead of just to keep the pipe flowing anyway.
Down pipes are big pipes coming of the spillway pipes that stick up past the height of the dam. They provide a way for air to enter the pipe incase something closes of end of it allowing the object, which is most of the time a large turtle, to swim away once the pipe fills with air and equalizes pressure. Another thing we put on the end is a cone made out of suckerrod, essentially tempered smoot rebar thats 3/4 of an inch in diamater that prevents anthing from getting to the pipe to create a seal. These two things greatly reduce the damage to flood spillways and to the dam itself.
Of course our ponds are 4-5 acres in size, One has 2 10" spillway pipes with one that runs most of the time as it is spring fed. However I have seen an excess of nearly 15-20,000 gallons entering it a minute before when it rains hard. Most days its probably around 500gpm.
Any way moral of this is I would advise adding a cone as it will keep large particles such as leaves, fish, and turtles from reaching your pre-filter and keeping your flow rate high.