Summary - City of Gosnells

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Wetlands Field Survey 83onto the floodplains below. The drains downslope from these floodplains should be redesigned to allowthe infiltration into the groundwater and nutrient stripping by vegetation in extensive but shallow,vegetated swales that mimic the original floodplains of the area.c. Palusplain mapped in DEC (2008b) where a change of classification to paluslope may be consideredSite 15 of the MKSEA study was located on a gentle slope that was mapped as a palusplain in DEC(2008b), but it was considered to be a paluslope on the data obtained in the current field survey. This isthe most well developed peat paluslope that has been identified locally and requires further study andcareful management to conserve its significant natural values.d. Upland mapped in DEC (2008b) where a change of classification to dampland may be consideredSite 27 of the MKSEA study was located in a shallow basin and was seasonally waterlogged. This areawas not mapped as part of a wetland in DEC (2008b) but was considered to be a dampland on the dataobtained in the current field survey. The hydrological factors maintaining this wetland are not clear andneed to be investigated in detail in order to manage the surrounding areas in a manner that is compatiblewith the conservation of this wetland.e. Sumpland mapped in DEC (2008b) where a change of classification to palusplain may be consideredUFI 8050 is mapped in DEC (2008b) as a sumpland. The area where this wetland is located is thelowest lying area in Precinct 1 and there is obviously a high watertable in this area (probably due toseepage from the base of the adjoining dunes of Bassendean Sands onto the Pinjarra Plain surface in thevicinity of UFI 8050. There are small sumplands in this area.However, these sumplands appear to havebeen excavated by landowners for use as ornamental ponds, and the fringing vegetation is degraded tocompletely degraded. The sumplands are interconnected by excavated channels to two drains (one ofwhich conveys water north via BFS 387 to Yule Brook, and the other west to Bickley Brook).The current investigation showed that the vegetated area of UFI 8050 is a palusplain (seasonallywaterlogged flat). It comprised Corymbia calophylla low forest over Kingia australis and mid-denselow shrubs in which about half of the species were obligate wetland plants.As with other areas of the MKSEA where there is a boundary between the Bassendean Sands and thePinjarra Plain, this area requires hydrogeological study to accurately map the wetland to define anappropriate buffer zone above the wetland and to develop a plan to restore the hydrological regime inthis area.f. Creeks that were not indicated in DEC (2008b)There was a small watercourse mapped in the current survey that extended from the UFI 7632 damplandto Yule Brook via UFI 7635. Part of the upper reaches of this creek were modified into an excavateddrain. However, the creek retained its natural form over much of its course.There was also a drain that extended from the UFI 7633 sumpland to Yule Brook via Coldwell Rd. Thisdrain was aligned along the route of a pre-existing creek in the area.A drain north-west of wetland UFI 7800 was also probably aligned along the route of a pre-existingcreek in the area.g. Uplands where no changes to the DEC (2008b) classification were recommended in the current surveyMKSEA Sites 22, 23, 24, 25 and 29 were located in dunes of deep, well-drained Bassendean Sands.These areas were not mapped as wetlands in DEC (2008b), which was confirmed in the current fieldsurvey.Tauss, C. and Weston, A.S. (2010). The flora, vegetation and wetlands of the Maddington-Kenwick Strategic Employment Area.A survey of the rural lands in the vicinity of the Greater Brixton Street Wetlands. Report to the City of Gosnells, W.A. Version 18.04.10
Wetlands Field Survey 84Table 6.2: MKSEA Study sites and their wetland identificationSite No.1. Hydroperiod and Water Table(WT) Relative to GroundSurface2. LandformStratigraphyFacultative & ObligateWetland Taxa1. F (as % total siteflora)2. O (as % total siteflora)Wetland Criteria of Site1. Hydric soils2. Hydrology3. Wetland taxa (O+F % of Total site flora)UFI and WetlandType1. Classification inSCP WetlandsDataset2. Classification inCurrent SurveySite 11. Surface waterlogged in spring.2. Flat.Shallow muddy quartz sand –sandy mud perches rainwater.(Deeper sediments notinvestigated)1. 59%2. 34%1. Hydric soils: shallow aquitard.2. Hydrology: waterlogged surface in winter, previouslyflooded by Yule Brook in winter.3. Vegetation dominated by wetland taxa (93% of taxa are Oor F wetland taxa).1. Hydric soils: shallow aquitard.2. Hydrology: waterlogged surface in winter where sand fillhas not been dumped, previously flooded by Yule Brook inwinter. 3. Vegetation dominated by wetland taxa at edge ofYule Brook.1. Hydric soils: shallow aquitard.2. Hydrology: inundation. Whole area previously flooded byYule Brook in winter.3. Vegetation dominated by wetland taxa (74% of taxa are O orF wetland taxa).1. Hydric soils: shallow aquitard, calcareous mud at depth.2. Complex hydrology: waterlogged surface, also shallowconfined aquifer. Previously flooded by Yule Brook inwinter.3. Vegetation dominated by wetland taxa (79% of taxa O or F)1. UFI 13362Palusplain2. PalusplainSite 21. Surface waterlogged in spring exceptwhere artificial fill has beendumped.2. Flat.Shallow muddy quartz sand –sandy mud perches rainwater.(Deeper sediments notinvestigated)Mostly naturalised andplanted aliens exceptriparian vegetationwhich is like Site 11. UFI 13362Palusplain2. PalusplainSite 31. Inundated to about 30 cm in spring.2. Small basin within a flat.Shallow sandy mud perchesrainwater.(Deeper sediments notinvestigated)1. 21%2. 53%1. UFI 13362Palusplain2. Palusplain/sumplandSite 41. Waterlogged at surface in spring.Deeper aquifer at about -145 cm.2. Flat.Muddy quartz sand oversandy mud (perchesrainwater) over coarse,gravelly-muddy sand, overcalcareous mud.1. 43%2. 36%1. UFI 7635Palusplain2. PalusplainSite 51. Standing water up to about 0.5 m inplaces, flooded by Yule Brook and atributary of Yule Brook that drainspart of Precinct 3.2. Mosaic of flats, shallow channelsand basins.1. Shallow standing water in springapprox +5cm max., deeper nearBickley Rd (except where sand fillhas been dumped near road).Shallow sandy clay perchesrainwater. Wetland partlymaintained by seepage from adjacentdune and possibly other factors.2. Flat.Shallow sandy clay.(Deeper sediments notinvestigated)1. 47%2. 41%1. Hydric soils: shallow aquitard.2. Complex hydrology: inundated and waterlogged areas inspring, maintained by several sources3. Vegetation dominated by wetland taxa (88 % of taxa O or F)1. UFI 7635Palusplain2. FloodplainSite 6Shallow sandy clay overhardpan at -80cm.1. 16%2. 81%1. Hydric soils: shallow aquitard.2. Complex hydrology: surface inundated in spring due toperching, seepage and possibly other factors3. Vegetation dominated by wetland taxa (97% of taxa O or F)1. UFI 14122Palusplain2. FloodplainTauss, C. and Weston, A.S. (2010). The flora, vegetation and wetlands of the Maddington-Kenwick Strategic Employment Area.A survey of the rural lands in the vicinity of the Greater Brixton Street Wetlands. Report to the City of Gosnells, W.A. Version 18.04.10
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18 April 2010The flora, vegetation
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SummaryiiSummaryThe City of Gosnell
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SummaryvMost of Precinct 2 (includi
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Table of ContentsTable of ContentsS
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Table of Contents6.4 Buffer zones f
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Introduction 2Two modified Concept
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Introduction 4• Comment on the co
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Regional Setting 6The Ridge Hill Sh
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Regional Setting 82.4 Hydrology and
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Regional Setting 10appropriate leng
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Regional Setting 12(Figures 6, 7),
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Regional Setting 14Pinjarra Plain V
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Regional Setting 16(Keighery, 1997)
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Regional Setting 18BFS 387 (Marshal
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Methods 203.2 Flora Sampling, Veget
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Methods 22and wetland evaluation. T
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Methods 242008c). Due to the time c
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Methods 26Wetland Scientific value:
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Methods 28Part IV: Supplementary Qu
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Methods 30C Semeniuk Research Group
Page 43 and 44: Methods 32Table 3.13: MKSEA Survey
Page 45 and 46: Flora 344.1.1 Flora of Conservation
Page 47 and 48: Flora 36include such things as the
Page 49 and 50: Flora 382. Significant PopulationsA
Page 51 and 52: Flora 40The total number of native
Page 53 and 54: Flora 42Eremophila glabra subsp. ch
Page 55 and 56: Flora 441. Taxa of scarce or refugi
Page 57 and 58: Flora 46was recorded in a small cla
Page 59 and 60: Flora 485. Melaleuca osullivanii. T
Page 61 and 62: Vegetation 505. Vegetation5.1 Veget
Page 63 and 64: Vegetation 522. Shrublands and Wood
Page 65 and 66: Vegetation 54FCT 8: Herb Rich Shrub
Page 67 and 68: Vegetation 56In several blocks in P
Page 69 and 70: Vegetation 58latilobus, Sphaerolobi
Page 71 and 72: Vegetation 60racemosa, *Hypochaeris
Page 73 and 74: Vegetation 62Vegetation Unit ST5: H
Page 75 and 76: Vegetation 64Associates of this veg
Page 77 and 78: Vegetation 66Map Unit& Total HaVege
Page 79 and 80: Vegetation 68of Western Australian,
Page 81 and 82: Vegetation 70Group A. FCT 3aResults
Page 83 and 84: Vegetation 721.SitesQ=quadratR=rele
Page 85 and 86: Vegetation 74it was recorded previo
Page 87 and 88: Vegetation 76Veg Unit andLocation i
Page 89 and 90: Wetlands Field Survey 78The stratig
Page 91 and 92: Wetlands Field Survey 80MKSEA Preci
Page 93: Wetlands Field Survey 826.2 Geomorp
Page 97 and 98: Wetlands Field Survey 86Site No.1.
Page 99 and 100: Wetlands Field Survey 886.3 Evaluat
Page 101 and 102: Wetlands Field Survey 90Table 6.3:
Page 103 and 104: Wetlands Field Survey 92MKSEAPrecin
Page 109 and 110: Wetlands Field Survey 98existing la
Page 111 and 112: Wetlands Field Survey 100The region
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Summary - City of Gosnells

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