Eurobodalla Integrated Water Cycle Management Strategy

128
Eurobodalla Integrated Water Cycle Management Strategy
moving to permanently live in them (i.e. retiring effect of baby boomers). Due to
development pressure, Council is investigating additional land areas that may be suitable
for urban subdivision. Although the timing of development of the various areas cannot be
predicted with certainty, it is accepted that the adopted population increase is sustainable.
Although Council’s current planning instruments allow for medium density and cluster
development, limits have been placed on building heights and population to floor space
ratio. To secure the built-up character of the future, Council is working with Planning NSW
to develop better and sustainable building envelopes and designs. Census figures show
that the age profile of the population spreads evenly between the age group 0–60 years.
Existing Water Management Systems
The Batemans Bay area is supplied by the regional water supply scheme, with Denhams
Beach service reservoir acting as the main storage. Denhams Beach supports a network of
local service reservoirs, the Long Beach reservoir services the area north of Clyde River,
the Batemans Bay and Catalina No. 2 reservoirs for the central area and the Lilli Pilli, Surf
Beach and Malua Bay reservoirs supply to the southern area.
A centralised sewage treatment plant located north west of Lilli Pilli services the whole
Batemans Bay area. The plant provides secondary treatment of the sewage and is based
on the continuous extended aeration process. The majority of the secondary treated
wastewater is returned to the environment through direct ocean discharge after natural
(pond) disinfection. Up to about 10% of the dry weather reclaimed water is reused on
Catalina Golf Club. The de-watered and stabilised biosolid is used for rehabilitating
Council’s landfill.
The sewer network servicing this area is extensive and has been grouped into three distinct
catchments:
The northern catchment serving the area north of Clyde River
The central catchment covering the central commercial areas, and
The southern catchment servicing the Lilli Pilli and Malua Bay areas (south of STP).
The northern catchment has about 10 pumping stations located along the bay foreshore
and conveys the sewage towards the treatment plant. The central catchment has about 30
pumping stations along the foreshore and a major station that receives the sewage
generated from both the local and north catchments. The sewage from the main pump
station is transferred direct to the treatment plant. The southern catchment also has about
10 pumping stations and a main station, which transfers the collected sewage to the
treatment plant.
The Eurobodalla Stormwater Management Plan has divided the area into 18 subcatchments
(see Figure 9-6).
The sub-catchments to the north of Clyde River are predominantly residential. The runoff
from these catchments stems predominantly from house roofs, impervious driveways and
the road network. There are about 1.2 km of pipeline and 501 pits. The stormwater from
these sub-catchments north of the Clyde River drains to Cullendulla Creek and the ocean.
The land use of the seven central sub-catchments is mainly commercial and more than
80% of the area is impervious. There are about 4.83 km of stormwater pipeline and 1 576
pits. The stormwater from two of the sub-catchments drains to the ocean through Wimbie
Creek, Joes Creek and the other subcatchments drain directly to the ocean.
The land use of the six southern sub-catchments is predominantly residential. There are
about 1.13 km of pipeline and 35 pits. The stormwater from two of the sub-catchments
drains to a wetland, and the other sub-catchments drain directly to the ocean.