Ltr-20190925-IR Response-Noosa Marketplace_FINAL (1)

    −   Despite this location being inundated by floodwaters,the maximum 1% AEP water surface
        level at the northern boundary is approximately 1.2 metres below the Eenie Creek Road
        pavement level in the developed case. Therefore, the proposed development further
        enhances the existing detention function with no additional risk to persons, property,
        environment or infrastructure at this location. Due to the enhancement of the natural detention
        basin by the development and site drainage improvements, reductions in peak flood levels
        during the 1% AEP event are indicated along a significant section of Hofmann Drive. Figure
        47 demonstrates the difference in water surface profiles between the existing and developed
        case 1% AEP events at this location;


Figure 48 – P4 Surface Profiles




Source: Cardno



        o    The designated environmental area downstream of the site that shows minor impacts is
             subject to inundation in the existing case for all rainfall events. To the south at the legal
             point of discharge, (environmental reserve) there are minor increases in flood levels
             during the 39% and 20% AEP events. These increases are caused by improvements to
             the drainage system capturing water that currently flows along Hofmann Drive to Rene
             Street and passing it under Hofmann Drive into these areas. The insignificance of this
             minor increase is shown in Figure 49 below;




 Ltr-20190925-IR Response-Noosa Marketplace_FINAL                                                            81