Referenced Document MCU13/0171

Figure 5.0: Typical Vegetated Stormwater Swales



Rainwater Tanks

In addition to reducing the pollutant load and volume of runoff being discharged from the
site, rainwater tanks also improve stormwater quality by disconnecting a major impervious
area within a development (i.e. the roof area) from the receiving waters.

It is proposed to connect a portion of the existing roof and gutters to rainwater harvesting
tanks with the intent to re-use some of the collected rainwater for wash-down & other non-
potable uses.

On the completion of construction phase for the factory re-purposing, all trenches and
exposed earth surfaces are to be reinstated with grass turf and planting or pavement, as
specified on the architectural drawings.

It is expected that the above best practice measures, being grassed or vegetated swales
and rainwater harvesting tanks, will significantly improve the quality of stormwater
discharge from site over the current conditions.



6.0 STORMWATER MANAGEMENT – QUANTITY

6.1 Existing Drainage

The existing site area to be re-purposed drains to the adjacent creek to the east. The
surface drains via overland flow, from the driveway adjacent to the side of the factory,
onto the grassed hardstand and into the creek. The existing factory roof over the
proposed upgraded area drains via the large existing downpipes which run below the
driveway pavement and discharge at headwalls built into the creek banks.
1014-ENG-01_Version 1.0 (September 2013)                                           Page 4 of 8
TS/cl