There is insurance, but its a waste of time IMO.
Disease is a problem, thats why you need differant species, so if one gets infected, you dont lose the others!
You should Know weather it could flood! If it does, you will need a fence around to keep the fish in.
And as for poaching, you dont just have blokes doing that, you have those black ducks, cormorants! and i think they roost at Kingsbury waters, and there another 1000 at the Trent only a few miles up the road.
My advice, is to have someone there eveyday, and keeping the predators off, and that includes dam seagulls, that take all your small fish. Herons, and grebs have a few, but the seagulls come in there dozens!
As for the water, if i was digging one from scratch, Firstly the excavated soil has to remain on site, and there will be more of it than the size of the hole, it is not viable, if you had to take it away. You cant build it too high either, or it wont hold water. A pool has to be either at water table level, or on line, stream fed.
It could be clay lined too.
I was once asked to dig a pond, i told him i could only dig the hole! lol.
I would have it deeper on the pole line too, so the fish are not out in the middle in the winter, and have some features in the pool, depths, islands, reeds, willows, lillys, etc.
Day ticket and matches are what you want, and dont have it silvers only, a minoroty want it silvers only, the majoroty wnat carp!
Come and see me anytime, i have plenty of ideas, and have dug my fair share of pools.
PM me, and ill send you my number, and come and have a look around Barston.
Barston Lakes Homepage
Nige.