Cistern covers are 2 x2 and are cast in the floor.
Cistern no gutters.
A cistern is an underground tank for storing water.
If you join too many downspouts before they enter the cistern you could have a constriction that would be problematic.
Rainwater harvesting is collecting the run off from a structure or other impervious surface in order to store it for later use.
Sweep all debris from the roof and gutters leading to the chosen downspout by using a broom.
I got the used drum locally for 15 and the wood came from my scrap bin.
It is more important that you have unrestricted flow into the cistern.
The cistern typically located underground may be constructed of various materials including cinderblock reinforced concrete or precast concrete fiberglass or steel.
I chose to use 2x6 material because i had it handy but if you choose to u.
Traditionally this involves harvesting the rain from a roof.
Put them where they need to be.
Remember that the x section of a 4 pipe is twice that of a 3 pipe.
This is a cistern i made from some pressure treated 2x6 material and a 55 gallon plastic juice drum.
The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel.
A system of gutters and downspouts directs the rainwater collected by the roof to the storage cistern.