Stormwater Assessment For Farmland In Rural Areas

Stormwater Assessment For Farmland In Rural Areas

We have completed a stormwater assessment for a site in the rural areas of Huapai, which is northwest of Auckland. It is a piece of horticultural productive land with a stream across the boundary of the site. A new building will be constructed with a new driveway to allow for access to the site in accordance with the standards.

There is an overland flow path (OLFP) with a flood plain which is consistent with the data from the Council. We have adopted the worst case scenario approach in which case there will be complete blockage of the stormwater drainage, and the calculations are made for the stormwater assessment, with recommendations to mitigate the stormwater runoff effects.

We advise that the new building is to be constructed with concrete slab on grade with possible perimeter wall foundations with concrete in-filled blocks. It is recommended that a conservative approach is taken to construct a suspended deck on piled foundations to allow for overland flows encroachment under the structured unimpeded.

The completed reports include detailed drawings and calculations for the stormwater flow path assessment to support the resource and building consent applications.