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LOT 1 (REFER INSERT)
STAGE 16ASTAGE 16B
STAGE 16C
EXIST EMT C SP247113 (DRAINAGE)
EXIST EMT C SP247115 (DRAINAGE)
EXIST EMT J SP247115(DRAINAGE)
EMT
NEW
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EXIST EMT P SP247115(SEWERAGE)
EXISTING LOTS
STAGING
STAGE 16A -7 LOTS
STAGE 16B - 12 LOTS
STAGE 16C - 13 LOTS
FUTURE STAGE 16D - 6 LOTS
` EXIST
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FIGURE 1120-ROL1: Lot Layout & Staging26/11/18 Rev 2
ABN 271 158 351 663
PH: 1300 220 195
EMAIL:ngardner@hartecsnga.com.au
INSERTPROPERTY DESCRIPTION:LOT 821 SP262542SURVEY DATUM:PM134434 E246136.104 N7418132.636MGA ZONE 56; RL33.070 AHDCONTOURS 0.5m NAT. SURF.
E:\Jobs C
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2.141m (FILL) MAX
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LEGEND
KEPPEL BLOCK ® RETAINING WALL
EARTHWORKS FOOTPRINT
ALLOTMENT EARTHWORKS (FILL) TO BE CARRIEDOUT AS PART OF ROAD CONSTRUCTION
FIGURE 1120-ROL2: Allotment Bulk Earthworks/Retaining26/11/18 Rev 2
ABN 271 158 351 663
PH: 1300 220 195
EMAIL:ngardner@hartecsnga.com.au
PROPERTY DESCRIPTION:LOT 821 SP262542SURVEY DATUM:PM134434 E246136.104 N7418132.636MGA ZONE 56; RL33.070 AHDCONTOURS 0.5m FIN. SURF. POSTALLOTMENT EARTHWORKS
E:\Jobs C
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(5.5/
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STRIN
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LEGEND
150∅ WATER MAIN; CONNECTION TO LOT (W);HYDRANT(H); VALVE (V)
UNDERGROUND ELECTRICAL, ALLOTMENT SERVICETURRET (E), STREET LIGHT (70W)
PROPOSED SEWER; MANHOLE,
EXIST SEWER TO BECOME REDUNDANT/REMOVED
INTER-ALLOTMENT ROOF WATER DRAINAGE PIT &PIPE
ROAD GULLY PIT & DRAINAGE PIPE
7.5/16 MINIMUM NOM PAVEMENT WIDTH/MINIMUM ROADRESERVE WIDTH
KERB & CHANNELFLUSH KERBKERB & TRAY
KEPPEL BLOCK RETAINAING WALL; MAX HEIGHT 1m
CONNECTION TO EXIST SERVICES (COLOUR CODED)
LEGAL POINT OF DISCHARGE/OUTLET1
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W150
S
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E E70
Sv
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EXIST SEWER CONNECTS(DIVERTS UCQ FLOWS)
EXIST CHANNEL CONCRETE INVERT
PROPOSED CULVERTCROSSING (Q100 CAPACITY)
EXIST SEWAGE PUMP STATION
FIGURE 1120-ROL3: Preliminary Infrastructure Details26/11/18 Rev 2
ABN 271 158 351 663
PH: 1300 220 195
EMAIL:ngardner@hartecsnga.com.au
PROPERTY DESCRIPTION:LOT 821 SP262542SURVEY DATUM:PM134434 E246136.104 N7418132.636MGA ZONE 56; RL33.070 AHDCONTOURS 0.5m FIN. SURF. POSTALLOTMENT EARTHWORKS
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DETAILS PROVIDED ON THIS PLAN ARE AN ONGOING UPDATE OF THOSE PROVIDED FOR THE PREVIOUSSTAGES IN THIS ESTATE COMMENCING WITH THE ORIGINAL FLOOD STUDY CARRIED OUT IN 2001 & DETAILED INTHE N G GARDNER REPORT TITLED TECHNICAL REPORT NO. 2 FLOOD STUDY 669 NORMAN ROAD LOT 65 ONSP104433 REFERENCE G101/1 REV2. THE CURRENT UPDATE REMODELS THE CATCHMENT USING THE LATEST2D FLOOD MODELING TECHNIQUE & THE RESULTS HAVE BEEN CORRELATED WITH OTHER RECENT FLOODMODELLING CARRIED OUT BY -· ROCKHAMPTON REGIONAL COUNCIL 2014 FLOOD STUDY CARRIED OUT BY AURECON & UPDATED 2018.· VDM CONSULTING HYDRAULIC IMPACT ASSESSMENT MASTERS DEVELOPMENT.MODELLING2D HYDRAULIC MODELING; AR&R RAINFALL IFD DATA & TEMPORAL PATTERNS; XPSTORM COMPUTER PACKAGE· LAURENSON ROUTING METHOD· LAND USAGE RESIDENTIAL· LOSS MODELS - UNIFORM LOSS & SEPARATE IMPERVIOUS AND PERVIOUS AREAS. PERVIOUS AREAS
INITIAL LOSS 0mm, CONTINUING LOSS 2.5mm/hr; IMPERVIOUS AREA INITIAL & CONTINUING LOSS 0mm.
LEGEND - WATER DEPTH
FSL RL25.5
FSL RL25.1
FSL RL25.0
Q100 INUNDATION AREA. REFER DEPTH LEGEND
CULVERT 3/3600x1200 BOX CULVERT;Q100 CAPACITY NO ROAD OVERTOPPING
FSL RL23.0
LEGEND
KEPPEL BLOCK ® RETAINING WALL
FINISHED SURFACE LEVELS POST ALLOTMENTBULK EARTHWORKS (0.5m INTERVAL)
Q100 FLOOD LEVELS (0.1m INTERVAL)
MINIMUM ALLOTMENT LEVEL ADJACENTCHANNEL
AREAS OF ADDITIONAL FILLING ASSOCIATEDWITH ROADWORKS
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FIGURE 1120-ROL4: 1 IN 100 Year Channel Inundation Mapping26/11/18 Rev 2
ABN 271 158 351 663
PH: 1300 220 195
EMAIL:ngardner@hartecsnga.com.au
PROPERTY DESCRIPTION:LOT 821 SP262542SURVEY DATUM:PM134434 E246136.104 N7418132.636MGA ZONE 56; RL33.070 AHD
E:\Jobs C
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EXISTING REED BED; AVE BED SLOPE 0.8%; AVEVEGETATION HEIGHT 0.5m; REFER PHOTO.
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AVE 30m
EXISTING FORMED 'NATURAL' CHANNEL
REED BED
FIGURE 1120-ROL5: Storm Water Management - Quality26/11/18 Rev 2
ABN 271 158 351 663
PH: 1300 220 195
EMAIL:ngardner@hartecsnga.com.auPROPERTY DESCRIPTION:LOT 821 SP262542SURVEY DATUM:PM134434 E246136.104 N7418132.636MGA ZONE 56; RL33.070 AHD
TABLE 2: TARGET WATER QUALITY OBJECTIVES (WQO)
Load Reduction(ref QWQG)
Indicator % ReductionTotal Suspended Solids (TSS) 85
Total Nitrogen (TN) 45
Total Phosphorus (TP) 60
Litter, Gross Pollutants (GP) 90
TABLE 3: PERFORMANCE EVALUATION - POLLUTANT MEAN CONCs (mg/L)
TSS TN TP
PRE & POST COMPARISON PRE POST PRE POST PRE POST
At Nominated Receiving Waterscombined wet & dry flows 8.26 0.652 0.245 0.066 0.028 0.006
TABLE 4: PERFORMANCE EVALUATION - POLLUTANT MEAN ANNUAL LOAD (kg/yr)
TSS TN TP
PRE & POST COMPARISON PRE POST PRE POST PRE POST
At Nominated Receiving Waterscombined wet & dry flows 1690 132 17.90 14.10 3.49 1.21
TABLE 5: PERFORMANCE EVALUATION - POLLUTANT REDUCTION (%)
TSS TN TP GP
At Nominated Receiving Waters
combined wet & dry flows
95 57 79 >90
Complies with Table 2 frequency
requirements.
TABLE 1: DESIGN AREAS (ha) (COLOUR CODED TO MATCH PLAN VIEW)
Outlet Total Roof Roads Ground level1 1.352 0.300 0.425 0.6272 0.678 0.180 0.060 0.4383 0.915 0.180 0.282 0.4534 0.574 0.150 0.061 0.3635 0.714 0.180 0.209 0.325
TOTAL 4.233 (100%) 0.990 (23%) 1.037 (24%) 2.206 (52%)
2. OPPORTUNITIES, CONSTRAINTS & PRECEDENTSThe type of development complies with the Council standards for Residential subdivisional works. Thisdevelopment is the continuation of a staged development.The principal pollutants likely to be generated from the site development will be hydrocarbons, metals,sediment and nutrients such as nitrogen and phosphorus fixed to the sediments.· Existing previously constructed stages include underground storm water drainage collection systems
sized for a 1 in 10 year design storm incorporating in-line SQUIDs sized for the ultimate catchmentarea(s) (Humeceptors ®);
· Road and allotment layout and sizing, soil types and functionality requirements precludes thepractical and feasible use of large scale above ground SQUIDs (vegetated swales; bioretention beds;wetlands) installed in the road verge area;
· Council in recent times have indicated a preference for the use of low maintenance self sustainingnatural storm water quality improvement devices such as swales. This stage discharges to anexisting formed 'natural' channel constructed as part of the previous upstream stages. Thischannel is fully vegetated and includes an extensive reed bed within the base; and
· Council can adopt and set storm water quality targets different to the those recommended in theState Planning Policy if considered more appropriate to the the site and available opportunities andconstraints.
4. PROPOSED STORM WATER TREATMENTAfter consideration of the available opportunities & constraints & current Council preferences, theselected treatment train shall comprise the use of the existing channel reed bed.In accordance with SPP Appendix 3's AO1.1b, this is considered current best practice reflecting land useconstraints in this case.
3. RECEIVING WATERSThe nominated receiving waterway is is an existing formed 'natural' channel which is part of theSplitters Creek system. Although some infiltration of storm water is likely to occur at the site, use ofgroundwater does not occur downstream of the site. Consequently, only surface water EnvironmentalValues (EVs) and water quality objectives (WQOs) have been identified.
1. REFERENCES STORM WATER MANAGEMENT & HEALTHY WATERWAY REQUIREMENTSThe site based storm water management plan has been based on the following publications andguidelines:· Healthy Waters Music Modeling Guidelines (HWMMG).· State Planning Policy April 2016 (SPP)· Queensland Urban Drainage Manual (QUDM)· Water Sensitive Urban Design (WSUD)· Storm water quality improvement devices are referred to as SQUID's.
5. PROPOSED STORM WATER TREATMENT EVALUATION & SIZINGThe evaluation & sizing of the components proposed and/or adopted for the treatment train has beencarried out using the MUSIC Version 6 computer package and 6 minute rainfall for the period from 1 January1939 to 31 December 2010. The pollutant types and concentrations evaluated for removal are -· gross pollutants (GP);· sediments and dissolved soils, Total Suspended Solids (TSS);· total dissolved nitrogen (TN); and· total dissolved phosphorus (TP).
All catchments have been modeled as 'Urban Residential' split catchments. The split catchment surfacetypes & associated runoff generation parameters; pollutant concentrations and generation parametersapplicable to these type of catchments and surface compositions recommended in Healthy Waters MusicModeling Guidelines have been adopted. Details of these areas are shown in Table 1.
The existing reed bed has been adopted as the most appropriate SQUID to suit the site opportunitiesand constraints. The design parameters adopted for the treatment capacity of the have been selectedfrom the HWMMG publication for swale drains plus a 3mm/hr exfiltration allowance for nutrient uptakeby reeds within the treatment area.
6. PERFORMANCE EVALUATIONDetails of the catchments applicable to this stage are summarised in Table 1. Details of the SPPsuggested target water quality objectives (WQO) for storm water discharging from the site to thereceiving waters based on nutrient load reduction are summarised in Table 2. Details of performance ofthe treatment train measured at the nominated receiving water for the whole of the upstreamcatchments are summarised in Tables 3 to 5. Tables 3 and 4 provide a comparison between the preand post development scenario. Table 5 provides details of the post development pollutant loadreductions for the proposed treatment train and evaluation in relation to target objectives in Table 2
7. CERTIFICATIONAn assessment has been carried out of the impact from this proposed development stage on stormwater quality (comparison between pre and post development loads) and the effectiveness of theproposed site water quality management in meeting the suggested SPP water quality standards forstorm water management and healthy waterways. Details of the nominated standards, comparisonbetween pre and post development pollutant loads & evaluation of the effectiveness of the proposals inmeeting the standards have been provided. Within the limits imposed by the available opportunities andconstraints and existing precedents, the proposed storm water management should provide -· Treatment comparable to the Council approved proposals for existing constructed stages;· An acceptable water quality management strategy that is the best achievable, cost effective and
within community and sensible expectations.
LEGENDDRAINAGE PIPES AND GULLY PITS
LEGAL POINT OF DISCHARGE; DRAINAGESYSTEM OUTLET
CONNECTED CATCHMENT
NOMINATED RECEIVING WATER NODE
3
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Colaaco Pty LtdABN 18 125 353 826
project
Forest Park Stage 16(Stringybark Avenue, Norman Gardens)
sheet no.
plan no. revision1 of 2
6233-16-ROL A
cad file
6233-16-ROL-A
plan of
lga
scale
1:2000 @ A3datum
AHD 0.25m Contours
created
Rockhampton Regional Council
rpd
Lot 821 on SP262542
IMPORTANT NOTE
This plan was prepared to accompany anapplication to Rockhampton Regional Council andshould not be used for any other purpose.
The dimensions and areas shown hereon aresubject to field survey and also to the requirementsof council and any other authority which may haverequirements under any relevant legislation.
In particular, no reliance should be placed on theinformation on this plan for any financial dealingsinvolving the land.
This note is an integral part of this plan.
Reconfiguration Plan1 Lot into 37 Lots + PUL + Balance
(Stage 16)
authoriseddate detailsissueRJKF5-12-2018 Initial IssueA
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07 4927 5199 | reception@csgcq.com.au | 132 Victoria Parade, Rockhampton QLD 4700
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