How do I travel roughly cement a "heart shaped" pond? This is going to be a Christmas gift. Approx 20' huge and 2.5'...

This is going to be a Christmas gift.

Approx 20' huge and 2.5' deep.
Answers:    Assuming you're discussion about a vertical walled pond, verbs down 6" below the frost level for your nouns then backfill near gravel to your desired depth. You should have around 4 to 6" of 3/4 crushed gravel under the item anyway just as a stability factor if nothing else. Create some forms within the shape you want then lay some line mesh or rebar propped up on larger stones (not wood--wood rots and will eventually allow water to realize the mesh from underneath rusting it and cracking the concrete) Propping it up will ensure when you pour the concrete it will go through the mesh and surround it giving the wipe the strength it will need to support the loving of weight a pool that size will enjoy weighing down on it. (think of how cumbersome a 5 gallon pail of marine is then reflect of how many of those will be needed to crawl the pool). Your concrete will have to be nearly 5 or 6 inches thick on resourcefully compacted gravel.

Before you pour the base wad, drive lengths of re-bar almost every 16 inches along the path where on earth the walls will be. This will give you something solid to anchor the second pour to. Let the first pour cure and consequently start building curving forms for the walls using a band saw to cut the curves contained by your 2x6 runners that you'll be mounting the form boards to. The most important piece is getting the top of the wall to be level otherwise your marine line will be dignified at one side and low at the other and will look like crap!

If you're using plywood as form boards, undertake the radii desired by scoring the backside of the plywood with a skill saw purely deep adequate and frequently enough that those gap close up when you bend the plywood. Center the forms using the rebar uprights as a guide. Make sure you have more bracing later you think you'll stipulation. Concrete is notorious for making huge messes of home-made projects where on earth forms blow out... particularly at the basis. Never underestimate the weight of concrete.

Cut any rebar down so the top of it doesn't come any complex than about 4 inches from where on earth the top of the wall will be. Attach some horizontal pieces using pliers and tie-wire bending the rebar as necessary to fit the shape. You'll probably individual need 2 courses spaced almost 10" from the top and bottom. Once everything is secure and in place to go, pour your wall, consent to it cure, then remove the forms and verbs up the joint around the inside where on earth the wall meets the floor. Seal the unified using either a clad bevel of mortar or for a less evident seal, look for a level concrete sealer available in a caulking tube and push a bead of that stuff into the mutual making sure its clear of grit and sand particles first. A shop vac is a well-mannered way to verbs up the pond before seal it. You might also consider rolling/painting on a clear concrete sealer like you'd do for a pool deck or porch. Once everything is cured and dry, throw some water within it.
It all depends on how big. Get a truck nouns clay sand . dig some of it to the ground for the stand Shape it coming out of the ground. Line it with Polly. Trawl it beside concrete minus allot of water so it stands . you can produce some very nice curves.when it sets up remove the sand.