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Amended Stormwater Plan
Attached to the e-mail Information Request Response REC16/0014.
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Log in to see the plans as drawnSC5551 - 28 Elkhorn Dr, Tewantin 12 4.3 Modelling Overview 4.3.1 Methodology A Rational Method calculation was conducted to determine that a situation of non-worsening could be achieved to the downstream (east and west) boundary conditions. The results from a Rational Method calculation are illustrated in Table 4.3. Full Rational Method calculations have been provided in Appendix C. Table 4.2 illustrates a large portion of the proposed development will discharge to the existing Elkhorn Drive drainage system. This is proposed to be upgraded in order to cater for the additional catchment. The proposed upgrade has been provided in Appendix A. 4.3.2 Catchment Areas Pre-development and Post-development catchment areas have been provided in Appendix A and below in Table 4.1 and 4.2. The catchment areas have been significantly reduced for the western boundary compared to the pre-development scenario. The eastern boundary catchment has remained the same compared to the pre-development scenario. An additional catchment to Elkhorn Drive is proposed, requiring upgrades as discussed previously. Catchment Name Description % Impervious Area (Ha) Roof 100 0.020 ‘A’ Landscape 0 0.302 ‘B’ Landscape 0 0.136 ‘C’ Landscape 0 0.115 ‘D’ Landscape 0 0.094 ‘E’ Landscape 0 0.153 ‘F’ Landscape 0 0.076 Western Boundary Total Catchment (ha) 2 0.897 Roof 100 0.032 ‘G’ Landscape 0 0.366 Eastern Boundary Total Catchment (ha) 0 0.398 Table 4.1 – Pre-Development Catchment Areas
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