Stage 1 Vegetation Overview Moore River South
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Insert title of report here Moore River South Stage 1 Vegetation Overview Moore River South Prepared for Moore River Company 24 July 2017 Prepared for Moore River Company Page 1 Stage 1 Vegetation Overview Moore River South Contact Information Document Information Cardno (WA) Pty Ltd Prepared for Moore River Company Trading as Cardno ProjeCt Name Moore River South ABN 77 009 119 000 File ReferenCe P7026-RP-002-B- Vegetation.doCx 11 Harvest Terrace, West Perth WA 6005 Job Reference P7026 Telephone: 08 9273 3888 Date 24 July 2017 FaCsimile: 08 9486 8664 International: +61 8 9273 3888 [email protected] Revision Number B www.Cardno.Com Author(s): Denise Morgan Approved By: Paul Wiseman EffeCtive Date: 24/07/17 Date Approved: 24/07/17 Document History Revision Date Description of Revision Prepared by: Reviewed by: A 21/07/17 Draft for Review D. Morgan P. Wiseman B 24/07/17 Issue D. Morgan P. Wiseman © Cardno. Copyright in the whole and every part of this document belongs to Cardno and may not be used, sold, transferred, Copied or reproduced in whole or in part in any manner or form or in or on any media to any person other than by agreement with Cardno. This document is produced by Cardno solely for the benefit and use by the client in aCCordanCe with the terms of the engagement. Cardno does not and shall not assume any responsibility or liability whatsoever to any third party arising out of any use or relianCe by any third party on the Content of this doCument. Prepared for Moore River Company Page ii Table of Contents 1 Introduction 1 1.1 Purpose 1 1.2 Sources 1 1.3 Study Area 1 1.4 Proposed Irrigation Areas 1 2 Vegetation 3 2.1 Vegetation Condition 3 2.2 Plant Communities 4 2.3 Significant Flora 5 2.4 Threatened Ecological Communities 5 2.5 Environmentally Sensitive Areas 5 3 Irrigation Assessment and Control 7 4 Conclusions 8 5 References 9 Figures Figure 1 –Approved POS and Outline Development Plan Figure 2 – Staging Plan Figure 3 – POS Conceptual Design Figure 4 – Conceptual Design Coastal Nodes Figure 5 – Vegetation Condition Figure 6 – Vegetation Communities Stage 1 Vegetation Overview Moore River South 1 Introduction 1.1 Purpose This report provides an overview of vegetation character and Condition affecting Stage 1 of the proposed Moore River South development, in support of an appliCation for Works Approval of a wastewater treatment plan to serviCe the development. In partiCular, the report relates to areas that are proposed to be irrigated by treated wastewater. 1.2 Sources Information for this report is largely sourCed from teChniCal reports prepared to support the ODP (StruCture Plan) for the development. These reports are listed in SeCtion 5. 1.3 Study Area The area the subjeCt of this report is Stage 1 shown in Figure 2. Stage 1 Comprises the following: > 1 x Town Centre lot > 1 x MuniCipal Depot lot > 1 x Emergency ServiCes lot > 32 x Light Industry/Mixed Business lots > 2 x Community Purpose lots > 1 x Tourism/Caravan Park lot > 171 x R20 Residential lots > 122 x R40 Residential lots > 6 x public open spaces. 1.4 Proposed Irrigation Areas As outlined in the approved District and Local Water Management Strategy (DLWMS - Cardno, 2013), the intention is to use publiC open spaCe (POS) and other landsCaped areas as the primary area for disposal of treated wastewater. In addition, the primary sChool playing field and irrigation of gardens within tourism sites will be Capable of taking some of the water. This seCtion only Considers retention and infiltration areas proposed within POS. Swales and bio-retention areas and infiltration in non-development areas such as natural depressions are not included as these are not proposed to be used for irrigation. The areas of POS approved within Stage 1 is desCribed in Table 1. The POS numbers relate to those shown on Figure 1. Table 1 Extract of POS Schedule from Endorsed ODP POS No. Stage Size (ha) Indicative Purpose (ODP) 1 1A,3,6 25.5137 Coastal dunal system and natural areas of Assume approx. drainage and habitat protection. Low key passive 8.5ha per stage reCreation, with strategiC aCCess to the beaCh inCluding turfed nodes with Car parking and amenities. ExCludes foreshore reserve whiCh may inClude similar amenities at strategic aCCess points. 2 1A 12.06 Buffer for Crown Reserve and protection of important flora and vegetation communities. Possible low key passive reCreation - walk trails, viewing locations, interpretive stops. 4 1A 1.143 Infiltration basin, vegetation retention, parkland 5 1A 0.8745 Infiltration basin, vegetation retention, parkland 9 1A 0.5089 Parkland Prepared for Moore River Company Page 1 Stage 1 Vegetation Overview Moore River South POS No. Stage Size (ha) Indicative Purpose (ODP) 12 1B 1.2746 Infiltration depression, vegetation retention, parkland Total Stage 1 POS 24.361 InCludes areas alloCated for conservation Primary School site 1A 2 School oval and grounds approximate area (subject 4.737ha to design and layout of sChool) Total including school oval 26.361 The proposed management of stormwater is desCribed in the DLWMS. Post development surfaCe water runoff was modelled for the 1 year-1 hour, 5 year and 100 year ARI critical duration storm events. Vegetated retention areas (including bio-pockets and swales within road reserves, and vegetated retention areas within POS and undeveloped areas) will be used to retain stormwater. Due to the highly permeable sand soils and the large separation to groundwater, rapid infiltration rates are expeCted. Table 2 summarises the areas of POS to be provided in Stage 1, the areas within them that will be used for infiltration of stormwater up to a 100 year ARI storm event, and the balance of land in each POS that would be available to reCeive irrigation of treated wastewater. From this it Can be seen that there will be more than ample area available within POS to reCeive irrigation. In addition, the primary school site will use treated wastewater for irrigation of the sChool oval. The total POS available in Stage 1 to reCeive irrigation will be around 20.5ha, plus the primary sChool site. Table 2 Unencumbered Areas Available for Irrigation POS No. Stage Size (ha) Area for Balance (ha) Infiltation** (m2) 1 1A 8.5 2,860 7.764 2 1A 12.06 5,950 11.465 5 1A 0.8745 6,775 0.197 9 1A 0.5089 - 0.5089 12 1B 1.2746 7,100 0.5646 Total 23.218 22,685 20.499 Primary School site 4.737ha 1A 2 (assumed) 2 2 Total including school oval 25.218 24,685 22.499 * Note: Primary sChool site will not be Cleared until ConstruCtion of the sChool and oval takes plaCe. Timing at the disCretion of the Department of EduCation. It is assumed that approximately 2ha of the site will be taken up by the playing fields. ExaCt areas of extant vegetation that will be Cleared within each POS will only be determined at the stage of detailed design and subject, if required, to obtaining Clearance approvals. ** Based on estimated basin top areas within POS for eaCh post-development sub-catchment identified in the DLWMS. It is proposed that POS areas will be irrigated with treated reCyCled wastewater. This will reduCe the total required water for the development, whiCh would otherwise need to be provided by groundwater. Through this strategy, the amount of groundwater allocation that needs to be secured is reduced. See Figures 3 and 4 for POS ConCeptual designs. Figure 3 is indicative of a typical park showing how existing vegetation Can be incorporated. Figure 4 is indicative of a Coastal aCCess node. The development will have a primary sChool situated on a 4.7ha lot. It is proposed that the irrigation requirements of the sChool will also be aChieved through treated reCyCled wastewater and the Department of EduCation has indiCated a willingness to aCCept this. Prepared for Moore River Company Page 2 Stage 1 Vegetation Overview Moore River South 2 Vegetation Broad regional information indiCates that the area is loCated within the Swan Coastal Plain Subregion Drummond BotaniCal SubdistriCt. The vegetation is broadly Categorised as Banksia low woodland on leaChed sands with Melaleuca swamps on ill-drained soils and woodlands of Tuart (Eucalyptus gomphocephala), Jarrah (EuCalyptus marginata) and Marri (Corymbia calophylla) on less leaChed soils (Beard, 1990). Regional vegetation Complex mapping undertaken by Heddle et. al. 1986 for parts of Western Australia indiCates that the study area is primarily within the Quindalup Complex. The desCription given for the Quindalup Complex is: “Coastal dune Complex Consisting mainly of two allianCes, the strand and fore dune allianCe and the mobile and stable dune allianCe. LoCal variations inClude low Closed forest of Melaleuca lanceolata – Collistris preissii and Closed sCrub of Acacia rostellifera”. A flora and vegetation survey of the site was ConduCted in November 1992 (Alan Tingay and AssoCiates 1993). This survey did not reveal any signifiCant or proteCted flora or vegetation, however suggested that "significant stands of Allocasurina lehmanniana Could be protected as much as possible within open space along the top of the Moore River Southern riverbank". In addition, the survey noted a feature could be made of some or all of the Tuart grove which also has an understorey of A. lehmanniana. 2.1 Vegetation Condition In late 2009 Cardno ConduCted a detailed spring flora and vegetation in aCCordanCe with the Environmental ProteCtion Authority's (EPA) Guidance Statement No.51 Terrestrial Flora and Vegetation Surveys for Environmental Impact Assessment in Western Australia (EPA 2004a) aCross the ODP area.