ordinary meeting of council to be held on tuesday, 26 april 2005 at ...

Ordinary Meeting <strong>of</strong> Council - 26 April 2005 8 / 3
Item 8
DA0177/03
24 March 2005
i. Provision <strong>of</strong> a 600mm diameter pipe relocated along the eastern boundary and <strong>to</strong> abandon the
existing 450mm diameter pipe. The pipeline is sized <strong>to</strong> cater for the calculated 1 in 20 year
ARI design flow <strong>of</strong> 860 L/s.
ii. Installation <strong>of</strong> a new grated pit at the common boundary <strong>of</strong> No.15 and 17 <strong>to</strong> reconnect in<strong>to</strong> the
existing 450mm diameter pipe that will remain in No.17 downstream.
iii. Provision <strong>of</strong> a relief overflow route over the relocated pipeline <strong>to</strong> convey surface flows in
iv.
excess <strong>of</strong> the road pit capacity, requiring terms for Restriction on Use varying in width.
Provision <strong>of</strong> additional road drainage pits and pipe work on the northern side <strong>of</strong> Burgoyne
Street as a consequence <strong>of</strong> a new driveway access <strong>to</strong> the proposed development.
v. Provision <strong>of</strong> an increased Easement <strong>to</strong> drain water 1.6m in width which complies with DCP
47.
Variation <strong>to</strong> Terms <strong>of</strong> easement
Both properties at No.15 & No.17 Pearson Avenue are burdened by a 1.22 metre wide drainage
easement, indicated on the drainage layout plan as Attachment 2, as LD 932 and LD 944
respectively. In these documents, the terms <strong>be</strong>nefit the Council only, allowing surface and
s<strong>to</strong>rmwaters from Burgoyne Street and Pearson Avenue, with specific reference for conveyance <strong>of</strong>
the s<strong>to</strong>rmwater by a 450mm diameter pipe.
Both LD 932 and 944 are required <strong>to</strong> <strong>be</strong> extinguished with a new easement created pursuant <strong>to</strong>
Section 88B <strong>of</strong> the Conveyancing Act 1919. Documentation is required <strong>to</strong> address:
• The upsized pipe,
• restriction on use for the overland flow path, and
• consent from No.17 for the discharge <strong>of</strong> private s<strong>to</strong>rmwater across their land from No15.
The applicant has submitted a Section 88B instrument and linen plan for execution which is signed
by both owners <strong>of</strong> No.15 and No.17 which appears <strong>to</strong> address the above requirements satisfac<strong>to</strong>rily.
Downstream <strong>of</strong> No.17, the s<strong>to</strong>rmwater is conveyed across another four properties until the public
system in Mt William Street. However, consents were not required as the four properties do not
have easements and the 450mm pipeline terminates in<strong>to</strong> an existing natural gully within No.17.
Assessment <strong>of</strong> proposed s<strong>to</strong>rmwater drainage
Attached are reduced scale plans <strong>of</strong> drawing GD 2.1 as Attachment 3 showing the S<strong>to</strong>rmwater
management, and partial drawing GD 2.4 showing the relief overflow path as Attachment 4.
Drainage details submitted <strong>to</strong> support the application were assessed and are considered satisfac<strong>to</strong>ry.
The following critical issues are noted:
i. Any up welling <strong>of</strong> s<strong>to</strong>rmwater at the transition pit (pit 10) <strong>be</strong>tween the upsized pipe (600mm)
in<strong>to</strong> the existing pipe (450mm) is considered indifferent as the magnitude <strong>of</strong> overflows across
No.17 is unchanged. The origin <strong>of</strong> overflow may either occur from over<strong>to</strong>pping <strong>of</strong> the kerb or
from the internal pit (pit 10) within No.15. Intermediate pits (pit 10, 12 & 13) in the property,
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