Ebb & Flow (Flood and drain) Hatching plans for how to grow the Chem OG from the Vault.  


Forum Regular
Joined: 9 months ago
Posts: 125
October 20, 2019 4:45 pm  

I am planning something along the lines of this for my next grow attempt so I have pulled together a few resources like this cool animated video with diagrams and some information from an article on the subject.

Whilst I have presented the information in my way making some edits the majority of the text comes from elsewhere online, I take credit only for putting the information into a forum post in a nice to read way not for the core content, thanks.

Flood and Drain (Ebb and Flow) systems are very popular with home hydroponic growers for many reasons. Besides how easy they are for anyone to build, you can use almost any materials you have laying around to build them with, so you don't need to spend much money to grow plants  hydroponically. Also they can be built to fit in any available space you might have (both indoors or outdoors), and there is no limit to the different and imaginative ways to design them for that space. Along with being inexpensive and easy to build, plants grow very well in flood and drain systems. The flood and drain system works basically like it sounds, by simply flooding the plants root system with nutrient solution. Only periodically rather than continuously. 

What you need to build a Flood and Drain (Ebb and Flow) system:
  • A container for the plant's roots to grow in.
  • A container (reservoir) to hold the nutrient solution. 
  • A submersible fountain/pond pump. 
  • A light timer to turn the pump on and off. 
  • Some tubing to run from the pump in the reservoir to the system to be flooded.
  • An overflow tube set to the height you want the water level.
  • Growing medium of some kind.

How a hydroponic flood and drain system operates quite simple. The main part of the flood and drain system holds the containers the plants are growing in. It can be just one plant, or many plants/containers in series. A timer turns on the pump, and water (nutrient solution) is pumped through tubing from the reservoir up into the main part of the system using a submersible fountain/pond pump. The nutrient solution continues to fill (flood) the system until it reaches the height of the preset overflow tube so that it soaks the plants roots. The overflow tube should be set to about 2 inches below the top of the growing media.

When the water filling/flooding the system reaches the overflow tube height, it drains back down to the reservoir where it recirculates back through the system again. The overflow tube sets the water level height in the flood and drain system, as well as makes sure the water (nutrient solution) doesn't spill out the top of the system while the pump is on. When the pump shuts off, the water siphons back down into the reservoir through the pump (draining the system).


There are three main types of flood and drain system setups:

Plant containers in series design:

Ebb&Flow Flood and drain systems

This type of setup is most commonly used when many different containers with plants are being watered (flooded) at the same time. It's important to remember that the system with the plants (containers) to be flooded (watered) needs to be above the reservoir, like on a table top or bench. That way the water can flow back to the reservoir by simple gravity, and thus drain the system correctly. 

First multiple containers are all connected
together through tubing so that when the system is flooded, they all flood evenly, and all at the same time. For simplicity, instead of having a separate overflow for each container being flooded, there's usually only one overflow tube. It connects to the system at the base where all the containers are connected to. And when the water height reaches the top of the overflow, it spills over and goes back to the reservoir to be pumped through the system again. The height of this one overflow tube will set the height of the water level in all of the connected containers with the plants in them (as long as it's level). You can change the water height in all of the connected containers by simply adjusting the height of the single overflow tube.


Flooding tray design:

Ebb&Flow Flood and drain table design

The flooding table/tray flood and drain (ebb and flow) system type setup is useful when you want to place plants in the system temporarily, need to be moving them around a lot, or starting plants to be placed in another larger system. Instead of flooding separate containers with plants in it, this method only floods one container. Usually a shallow square or rectangle container that sets on top of a table. The reservoir usually sits directly underneath with easy access. 

Ebb&Flow Flood and drain table when flooded

Water is pumped up from the reservoir into the flooding tray on one side, and the overflow is on the other side of the flooding tray. That makes sure the water actually circulates from one side of the tray/table to the other. Like any flood and drain (ebb and flow) system, the overflow tube height sets the water height during the flooding cycle, and can be adjusted as needed.

Ebb&Flow Flood and drain table when drained

The plants are grown in regular plastic pots or baskets, and placed in the flooding tray like regular potted plants. However, unlike regular potted plants, hydroponic growing media is used to pot the plants instead of using potting soil. Once the plants get big enough, they can be transferred into a permanent hydroponic system.

One downside to using the flooding table is the algae growth, and should be cleaned out regularly. Because the top of the tray is usually left open, light is allowed to get in to the nutrient solution in the bottom of the tray, That allows algae to grow. The algae alone isn't really bad for the plants, but it does use up dissolved oxygen in the water.    


Serge tank flood and drain (ebb and flow) system design:

Ebb&Flow Flood and drain systems with serge tank

The serge tank type of flood and drain setup is useful when more vertical space is needed. Typically with flood and drain systems, the reservoir is always lower than the hydropnic system. That's so the water (nutrient solution) can drain out of the system through gravity back into the reservoir through the overflow, and when the pump is off. But you can still set up a flood and drain system even when the water level in the reservoir is higher than the hydroponic system it's supposed to flood and drain back from. That is with the use of a serge tank.    


Ebb&Flow Flood and drain systems with serge tank in flooding cycle

The serge tank type of flood and drain system costs more to build because there are many more parts needed. It works on the principal that water seeks it's own level. In other words, the water height in one container will be the same in another container when they are connected below the water line. The serge tank serves as a temporary reservoir that controls the water height in all the containers with the plants in them, and is only full during the flooding cycle. 

Ebb&Flow Flood and drain systems with serge tank in flooding cycle

The serge tank flood and drain (ebb and flow) system operates by pumping water (nutrient solution) from the much larger main reservoir into the serge tank when the pump timer goes on. As the water level rises in the serge tank, the water level rises evenly in all the connected plant containers at the same time. When the water level gets high enough, a float valve in the serge tank turns on a pump in the serge tank. The pump in the serge tank then pumps water back into the main reservoir. At this time both the pumps are on (pump in main reservoir, and serge tank).


Ebb&Flow Flood and drain systems with serge tank in drain cycle

After the timer for the pump in the main reservoir shuts off, the pump in the serge tank is still on. The pump in the serge tank continues pumping all the water back into the main reservoir (draining the system) until the water level gets low enough. At that point a second float valve shuts off the pump in the serge tank.


I even found some PDF plans for two different types of Ebb and Flow which I will put links to bellow:

Link one (6 Plant Flood & Drain Hydroponic system)

Link two (Twelve Plant Hydroponic Flood and Drain System)

“It take many a year, mon, and maybe some bloodshed must be, but righteousness someday prevail.” Bob Marley


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percysgrowroom March 13, 2019