How to make a sealed downpipe system (wet system) to a rainwater tank

This video shows how to make a sealed downpipe system or also called a wet system to a 2,000 litre tank using pipes with a diameter of 90mm. in this video we connect 2 downpipes to cover a roof area of approx. 70sqm.
For rainwater harvesting systems which
cover a larger roof area or with more downpipes connected it is recommended to use 100mm diameter pipes. 100mm diameter pipes are also recommended if you connect to a larger rainwater tank because those tanks are designed to be connected to a 100mm pipe.
The sealed downpipe system in this video is designed for the rainfall in Victoria, Australia. With the given annual rainfall in Victoria and the plan to only connect 2 downpipes to a 2,000litre tank we decided to use 90mm diameter pipes.

[@PeterWilson-dx2mx]

Was a plumber helping you do this?
The "flush outlet" won't help much to clear the sediment as it will only drain the volume of water that is above its height.
Mosquitoes can access the standing waters and lay eggs.
The velocity through the stormwater pipes will be insufficient even during heavy rain to prevent sediment building up near the downpipes.
The method used is laborious and time intensive. Modern methods leave the stormwater pipes unaltered and do not need to use an overflow pipe at the tank.

[@auzziman911]

How do you stop it blocking up with sediments

[@roman8102]

There is a pipe opening near the bottom of the pipe which goes into the tank. It has a screw -on lid which I can take off to clean the sediment out.