Page 1896 - Week 06 - Thursday, 30 July 2020
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(3) Hardwick Crescent has been investigated further in the revised 2020 study and it has been identified that minor flooding may occur along this road. The TUFLOW model shows that Hardwick Crescent could have 100mm of water above acceptable flood levels (noting that all streets act as floodways during storms) for approximately 30 minutes during a 1% Annual Exceedance Probability (AEP). The overland flow along Hardwick Crescent is contained between the kerbs for the majority of the road. There are no documented flooding complaints from the public at Hardwick Crescent, and the overtopping of the kerb observed in the model does not cause flooding to properties.
(4) The nature of flooding along Hardwick Crescent has only recently been confirmed by the revised 2020 study. No works have been undertaken for this location and it would be premature to do so given the proposals for new roads in the area associated with the expansion of the centre are unknown. Due consideration will be given to potential flooding generally, including Hardwick Crescent, as part of the future design.
(5) The draft report of the revised 2020 study addresses the reference to incomplete stormwater pit and pipe data as follows:
Stormwater Pit and Pipe data was provided by EPSDD and TCCS in 2015 and was used in the original 2015 Calibre Flood Study. A thorough review of this data revealed some missing information regarding pipe diameters, invert levels, and locations.
ACT Survey was engaged in 2015 to obtain the missing data. The stormwater network for 375mm diameter pipes or greater were added to the TUFLOW model within the TUFLOW Model Area. The extent of the minor network used in the 2015 Calibre Flood Study is displayed in Figure 5-2.
TCCS confirmed that there is no new stormwater infrastructure constructed within the model area since 2015. Therefore, the same stormwater network has been used for this updated 2020 study.
(6) An overall plan of the stormwater network in the area, including pit and pipe data, will be provided in the final report of the revised 2020 study.
(7) Any new development will be required to have floor levels that are above the 1% AEP +300mm flood level. Existing floodways in the area should be cleared of obstructions or augmented as part of new development. Any development proposal for the site will need to provide a report indicating how the civil engineering issues associated with the development of the site are addressed.
(8) No flood prone properties have been identified by the revised 2020 study. It is therefore expected there will be no unusual insurance implications relating to flood risk in the area.
(9) The revised 2020 study indicates the need for an augmented floodway adjacent to the Kippax Fair expansion. This should be incorporated as part of the development works.
(10) The proposed road linking Moyes Crescent with Hardwick Crescent would be constructed to all relevant standards including those relating to drainage and flooding requirements. These requirements are well established in ACT Government Codes and Standards.
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