Water depth balance in multilevel small pond

[Deanery]

I have constructed out of preformed ponds with spill ways a small 75 gallon, 3 level pond. Water is pumped with a 290 gph pump from bottom to top. Tubing is 3/4 inch, rise about 1.5 feet, spill ways about 6 inches wide. My problem is that over a 12 hour period the water in the lower pond drops by about half and the water in the upper levels increases. How do I maintain balanced levels? The water returning through the spill ways is clearly not sufficient to keep the lowest level full. Do I need a bigger pump or do I need to use a valve to slow the water going to the top level? Any suggestions would be greatly appreciated.

 

[j.w]

@Deanery
Not sure how to fix your issue, sorry.

 

[sissy]

a valve would help you figure out if you need a bigger pump or not . Welcome I have a preformed lily pond that was my fisrt pond back in 2005

 

[Lisak1]

Is the top pond overfilling?

It sounds to me like a simple solution would be adding more water to the system, but maybe I'm missing something.

 

[Mmathis]

Hello and welcome.

Some pictures of your setup might help.