21556 Response to Information Request OPW220104

Response
The footpath width has been increased to 2m wide west of the existing property along the
frontage of the new lots.

Issue
It is not clear that all lots achieve a minimum 1% fall towards the internal road.

5. Information Required

Demonstrate that all the lots achieve a minimum 1% fall towards the internal road.
Alternately, provide amended plans detailing an inter-allotment drainage system for the
lots.

Response
Minor earthworks shaping has been added to lots 1 & 2 (similar to approach taken with lots
8 & 9) to provide 1% fall towards the new internal road. The natural slope towards the west
has generally been maintained with this proposed shaping. Roof water from houses on
these lots can free drain to the street via pipes connected to the proposed kerb adaptors.


Issue
From the review of the SWMP and the OPW drawings, it seems that the overflow pit for
the bioretention basin needs to have a sealed lid in order for the detention function to work
as modelled.

6. Information Required

Provide confirmation that this is the case and update the plans as necessary.

Response

Peak Urban (authors of the SWMP) have confirmed that the outlet pit in the bioretention
basin needs to have a sealed lid. Drawings have been amended accordingly to reflect this
requirement.

Issue


The submitted documentation, indicates that the ESC plan and the sizing of the sediment
basin are based on a catchment area which excludes the 2 existing properties.