Intake Bay Design Equations and Numbers Needs


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So now I’m leaning towards negative edge. Immediately after the negative edge would be the catch area comprised of a few aquablocks topped with appropriate sized gravel. Then followed by a rectangular reservoir that would be capped with a duck pen. The duck pen would be modular so sections could be removed if ever the need to get into the reservoir. Basically I’m envisioning building a deck over the reservoir with duck pen on top of the deck. So the reservoir would have no need for aquablocks or a gravel top, if all goes accordingly no one would know the reservoir is under the pen. Here is my next question: how shear and deep can I make the walls of the reservoir if there is only water in the reservoir applying pressure to the liner and the dirt behind the liner? I was thinking about maybe making a box of treated lumber for a structure for the reservoir and a foundation for the deck. If I could get to 5x10x4 that would be a 1500 gallon reservoir and that should be enough.
 
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How would you support the deck over the reservoir? Just way cantilevered out? That's going to get expensive real quick. Probably more expensive than just filling the reservoir with aqua blocks. You'll also need cleanout access to drop a pump down there to pump out gunk from the bottom periodically.

Also plan for overflow from the reservoir if you get a ton of rain.
 
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The idea is to dig your hole straight up and down walls the size of how many blocks you use. They determine the exact measurements . BUT YOULL WANT TO LEAVE SOME ROOM so you can get the two layers of fabric and one layer of rubber and preferably sand.

So dig the hole. Dry set the blocks if you need to to check the size fits in the hole. Line it with fabric . Install the rubber and a second layer of fabric over the liner. Place your matrix blocks and once thats done pull the fabric and liner in and cover the top of the blocks. This keeps dirt and such from falling in . But you want to leave one area open to have the water drop in. Backfill the remaining with sand that will hold up against collapse. . If your prefer you can install the liner like a pond and just rock over the top of the blocks.
 
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How would you support the deck over the reservoir? Just way cantilevered out?
Starting with a level area I would dig a rectangular hole and put a deck over it which would be supported by a substructure outside of the hole on all four sides or by a box I build to support the walls of the hole. No need to cantilever.
The idea is to dig your hole straight up and down walls the size of how many blocks you use. They determine the exact measurements . BUT YOULL WANT TO LEAVE SOME ROOM so you can get the two layers of fabric and one layer of rubber and preferably sand.
Yes, this is the plan for the bog. What I'm attempting to do here is make a reservoir without using aquablocks. 1500 gallons worth of aquablocks is no small amount, I already plan to buy 64 blocks. I am just wondering how that can be done? I'm thinking I could dig my 5'x10'x 4' deep hole and set 4"x4"x6' treated posts around the sides set in 2feet of concrete below the floor of the reservoir hole and then build walls using 2"x12"s. Put the liner in the hole and over the walls. Use the walls and 4x4s as the foundation of the deck. The deck itself would add support to the walls of the reservoir. Build the duck pen on top of the deck so the space is used for something. Portions of the deck and pen would be designed so they could be removed for access to the reservoir below. Does this sound like something that could work?
 

Jhn

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would not bury 4x4’s, 2x12’s in the ground unless you can get them rated for ground contact, otherwise they will rot out in short order. If it were me I would just dig the hole, as @GBBUDD suggested, walls straight down, and back fill Around it no need for reinforcing the walls. If you are going to deck it over sink 6x6 posts into the ground like a normal deck, no sense in cheaping out on 4x4’s instead of using 6x6’s .
 
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If you want a really sturdy hole at a reasonable cost without matrix blocks, you could line it with the large format landscape retaining blocks before installing a thick underlayment like old carpet and then your liner. You could also just dig the walls of your hole at 15-30°. That will add a lot of stability.

For an unsupported wall, highly recommend ensuring runoff will move away from that area and not seep in and wet the wall.
 
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Jhn

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@jgell Okay, now I get what You are doing, as I said if you choose to reinforce the walls with wood, make sure it is rated for ground contact ( not all treated lumber is the same anymore) Also, watch using 2x’s on edge if you leave large enough spaces between the posts the 2x’s don’t have the structural integrity to hold back much over time. Would go with cw’s suggestion of blocks or you could use treated 6x’s stacked and pinned together at the corners, then just build the deck sitting in the top 6x.
 
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