Agricultural Drainage Systems
With the huge amounts of rainfall that we have had lately, stormwater systems have become a necessary part in keeping properties from flooding and having water buildup in unwanted places. This house in particular had an unwanted waterfall in the yard due to multiple properties above draining onto the land in heavy rainfall. Two systems were installed here to protect the house. One - Agricultual drainage systems, which are a subsoil drainage system and two - an emergency overflow system of pits and large pipes which acts as a redundancy system for the one in a hundred-year storms (which we have had over the last two years).
This agricultural drainage system uses a series of trenches that drain into stormwater pits located at the end of them. These pits then discharge the water into the stormwater easement located at the base of the property through 150mm PVC pipes.
How we install agricultural drains
Agricultural drains serve to remove the water that flows over the surface as well as under the soil within the trench's depth. It achieves this by steering water into a trench filled with blue metal or a similar aggregate with an agricultural drain located in the base. The pipe itself comes wrapped in a Geotech fabric to stop silt making its way into the system. We wrap the entirety of the blue metal and agricultural drain in an additional layer of Geotech fabric as this keeps the blue metal trench from filling with silt over time and maintains its functionality for as long as possible.
It is important that the trench is created with natural fall so that water can be guided to a collection point. Without fall the trench will hold water and not serve the purpose of taking water away from the desired area. The system needs to remain at least half a metre away from footings and piers if possible.
The trench can run into a pit where water can be collected and redirected into the existing drainage system. If fall cannot be achieved, a pump can assist in the removal of the water. Often this water will need to be pumped directly to the street.
If you would like a quote on work like this, we would love to provide you with one!