Works Approval Report.pdf - the National Capital Authority

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Campbell Section 5 - Works Approval Project Ref: 110029Prepared for the Land Development AgencySubsoil drainage will be provided adjacent to the road pavement to collect and discharge subsurfacewater generally in accordance with the TAMS’ Design Standard Drawings. The subsoil drainage willdischarge to the stormwater drainage network at regular intervals.The proposed pipe network and overland flow paths through the site are shown in Figure 8.3.Pipeline:ProposedOverland Flow Path:ProposedFigure 8.3: Proposed Stormwater Network Flood ModellingXpswmm 1D models comprising the Campbell Section 5 catchment and the adjacent easterncatchment were assembled for both existing and proposed development conditions. The existingconditions model was used to estimate the quantum of overland flow through the site thatcontributes to the total flow reaching the Constitution Avenue/Creswell Street intersection low point.Estimated inflows and outflows for both existing and proposed catchment conditions are shown inTables 8.1 and 8.2.November 2012 Cardno 50
Campbell Section 5 - Works Approval Project Ref: 110029Prepared for the Land Development AgencyARI(yrs)Anzac Park East/ Page St IntersectionAnzac Park East LowpointEstimated Flow (m 3 /s)Chowne StLow pointCreswell StLow pointExisting Developed Existing Developed Existing Developed Existing Developed1 0.19 0 0.04 0 0 0 0 02 0.43 0.11 0.06 0 0.09 0 0 05 0.59 0.30 0.08 0 0.38 0 0.26 010 0.67 0.38 0.10 0 0.57 0 0.42 0100 1.02 0.73 0.18 0 1.44 1.00 0.88 0.33Table 8.1: Estimated Site InflowsARI(yrs)Estimated Flow (m 3 /s)ExistingDeveloped1 0.73 02 1.68 05 2.37 0.0910 1.77 0.26100 4.80 0.75Table 8.2: Estimated Contribution to combined catchment Flow at Constitution Ave/Creswell St Low pointXpswmm 2D models of the proposed retarding basin were also developed to determine the waterlevels and extent of ponding in various storm events up to 100 year ARI. Maximum water levels areprovided in Table 8.3 and the ponded water extents for the 2 year and 100 year ARI are shown inFigure 8.4. It should be noted that the maximum 100 year ARI water level is 200mm below thelowest point in the northern verge of Road 2-(B) and Road 2-(C).ARI(yrs)Water Level(m AHD)Water Depth(m)1 563.37 0.872 564.22 1.775 564.75 2.2510 564.90 2.40100 565.23 2.73Table 8.3: Retarding Basin Maximum Water LevelsNovember 2012 Cardno 51
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Works Approval Report.pdf - the National Capital Authority

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