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