Ive got rid of most of the photos of my pond off my tablet, but I found one on my picture of the day. It shows half of my pond. View attachment 59481
Where's the other half, did you leave the plug out by accident one day?

Ive got rid of most of the photos of my pond off my tablet, but I found one on my picture of the day. It shows half of my pond. View attachment 59481
Did you give him any choice?
If heron are a problem you will need a trip wire. I second the advice regarding depth but if you also want plants perhaps build your pond with a ledge of shallower water with depth in the middle.
My wife wanted a "water feature" and an old hibiscus dug out. The roots went down over 4 foot, which is why my water feature is a 900 gallon pond.a friend decided he wanted a pond in the garden, but after negotiation with the domestic authorities was scaled back in size somewhat with a given limit of 1 square metre. Despite being married for many years, and knowing what the chap is like, and his tendency to take instructions very literally she still neglected to specify the 3rd dimension. A while after construction she somehow managed to fall in and , only then noted it was over 2m deep !