Hi,All
I'm in the process to look for a suitable site for duplex development. However, after some discussion with builders and a little bit exploration of council's policies, I get some concerns over the stormwater drainage.
The following is the general requirement of stormwater drainage for a new development.
"If the site for the proposed development is located on the low side of the road, and it is impossible to drain the stormwater from the proposed site by gravity (minimum 1% grade in pipes) to the kerb and gutter, gully pit or Council pipeline located in the road at the front of the site, then the owner must obtain a 1.0m wide stormwater easement through the property at the rear/downstream to allow all stormwater to drain by gravity to the kerb and gutter in the street at the rear/downstream of site."
In the worst case, if a drainage easement cannot be achieved for a low-side property, councils may allow some alternative methods such as on-site absorption system, but they will then impose some limitations to the new development (such as a maximum 35% site coverage, etc). This may not be a big problem for a single dwelling but may be trouble for duplex development which generally has larger roof area and hard surface area.
Therefore, is it better to avoid low-side properties when looking for a possible duplex development site (especially no drainage easement can be achieved)?
Comments or advices are welcome
I'm in the process to look for a suitable site for duplex development. However, after some discussion with builders and a little bit exploration of council's policies, I get some concerns over the stormwater drainage.
The following is the general requirement of stormwater drainage for a new development.
"If the site for the proposed development is located on the low side of the road, and it is impossible to drain the stormwater from the proposed site by gravity (minimum 1% grade in pipes) to the kerb and gutter, gully pit or Council pipeline located in the road at the front of the site, then the owner must obtain a 1.0m wide stormwater easement through the property at the rear/downstream to allow all stormwater to drain by gravity to the kerb and gutter in the street at the rear/downstream of site."
In the worst case, if a drainage easement cannot be achieved for a low-side property, councils may allow some alternative methods such as on-site absorption system, but they will then impose some limitations to the new development (such as a maximum 35% site coverage, etc). This may not be a big problem for a single dwelling but may be trouble for duplex development which generally has larger roof area and hard surface area.
Therefore, is it better to avoid low-side properties when looking for a possible duplex development site (especially no drainage easement can be achieved)?
Comments or advices are welcome
