Council archive · source document
17155 - Stormwater Quantity Assessment Letter - Rev 0 · OPW17/0612
Attached to the e-mail Operational Works Application OPW17/0612 1 of 2 – Precinct E2 Noosa Springs, Noosa Heads - (MCU15/0109).
Our Ref: 17155/CG Council Ref: MCU15/0109 Monday, 18 December 2017 Noosa Council Development Assessment PO Box 141 TEWANTIN QLD 4565 Attention: Mark Lewis RE: Stormwater Quantity Assessment Proposed Residential Development at (Precinct E2) Resort Drive, Noosa Heads This stormwater quantity assessment letter has been prepared for the proposed residential development at Resort Drive (Precinct E2), Noosa Heads as supporting information for the Operational Works Application. This letter investigates the effects the development will have on stormwater quantity. The objective of this letter is to confirm the proposed development adheres to the following Council Development Assessment Conditions: Condition 36: The site must be provided with a stormwater drainage system connecting to a lawful point of discharge. The works must be undertaken in compliance with a development permit for operational works and must include in particular: a. Stormwater collection and pipe system in accordance with the requirements of latest Queensland Urban Drainage Manual (QUDM) and related guidelines. b. Stormwater retention and/or detention systems must be provided within the property to ensure all stormwater runoffs from the site are maintained to its predevelopment rates for all storm events up and including 1% AEP. It is intended to develop Precinct E2 and F in an integrated manner, such that the developments are considered a single development. Therefore this letter has been prepared considering both developments as a whole when completing the stormwater quantity assessment. 1.0 Previous Studies A review of the Noosa Spring Master Drainage Report (June 1995) by Ralph Grierson confirms that Precinct F and E2 in the developed state was considered as part of the master drainage plan for Noosa Springs Resort and Golf Course. Figure 1 below is the catchment plan (drawing no: SW 1) from the above mentioned report. The report confirms the development was considered to have a 50% impervious factor (for urban areas) and Figure 1 confirms the site’s time of concentration of 15 minutes. The report also confirms that underground D:\JOBS\17-Jobs\17155 - Precinct E2 Noosa Springs, Noosa Heads\Civil\Reports\SW Quantity Assessment Letter\Working\17155 - Stormwater Quantity Assessment Letter.doc
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Page 2
MORGAN CONSULTING
E NGINEERS P TY LTD
16003/CG
Page 2
drainage infrastructure within Resort Drive and connections to the development have been
designed for the 10 year ARI (minor storm) event while the drainage flow paths through
Noosa Springs Resort, which includes overland flow paths and underground drainage, have
been designed for the 100 year ARI (major storm) event.
Figure 1: Drawing SW 1 from Noosa Spring Master Drainage Report (June 1995) by Ralph Grierson
Based on this report, the Resort Drive road pipe drainage and property connections to the
development have been designed for the minor storm event with the site developed to an
imperviousness of 50%.
2.0 Stormwater Quantity Analysis
XP-RAFTS was used to model the peak discharges from the development under both existing
(pre development) and proposed (post development) conditions.
2.1 Pre Development
Refer to the enclosed Pre Development Catchment Plan for the catchment details.
Page 3
MORGAN CONSULTING
E NGINEERS P TY LTD
16003/CG
Page 3
Table 1 summarises the input parameters used in the XP-RAFTS pre development model for
each of the catchments. Pervious and impervious areas were measured from the detailed
survey plan for the development. The detailed survey of the development was used to
determine the vectored slope while aerial photos and findings from the site visit were used
to determine the Manning’s n for each of the catchments.
Table 1: XP-RAFTS Source Node Parameters
Pre Development
Parameter
Pervious Impervious
Catchment Catchment
Initial Loss (mm) 10 0
Continuous Loss
2.5 0
(mm/hr)
Manning's "n" 0.035 0.015
IFD Coefficient Noosa Noosa
Storage Coefficient 1.0 1.0
Table 2 summarises the pre development peak discharges calculated by XP-RAFTS for a
range of design storms.
Table 2: XP-RAFTS Pre Development Peak Discharge
XP-RAFTS Pre Development
ARI
Peak Discharge
(Years)
(m3/s)
1 1.432 (1yr 25min storm)
2 2.084 (2yr 25min storm)
5 2.769 (5yr 25min storm)
10 3.127 (10yr 25min storm)
20 3.603 (20yr 25min storm)
50 3.776 (50yr 25min storm)
100 4.186 (100yr 25min storm)
Refer to the attached pre development peak flow rate hydrographs from XP-RAFTS.
2.2 Post Development Unmitigated
The catchment details in the XP-RAFTS model were amended to represent the ultimate post
development conditions. Refer to the enclosed Post Development Catchment Plan for the
catchment details.
The model input parameters summarised in Table 1 have been used for the XP-RAFTS post
development model for each of the nodes as described above. Pervious and impervious areas
were measured from the detailed design plans for the site. The detailed design plans were
used to determine the vectored slope and the Manning’s n for each of the catchments.
Page 4
MORGAN CONSULTING
E NGINEERS P TY LTD
16003/CG
Page 4
Table 3 summaries the post development un-mitigated peak discharges calculated by XP-
RAFTS for a range of design storms.
Table 3: XP-RAFTS Post Development Unmitigated Peak Discharge
XP-RAFTS Post Development (Unmitigated)
ARI
Peak Discharge
(Years)
(m3/s)
1 1.622 (1yr 25min storm)
2 2.126 (2yr 25min storm)
5 2.696 (5yr 25min storm)
10 3.022 (10yr 25min storm)
20 3.473 (20yr 25min storm)
50 3.647 (50yr 25min storm)
100 4.050 (100yr 25min storm)
Refer to the attached post development unmitigated peak flow rate hydrographs from XP-
RAFTS.
As seen in Table 2 and Table 3 there will be a net increase in the 1 year and 2 year ARI
event peak flow from the development and reduction in peak flow for all other ARI events.
Therefore on site detention will be required to mitigate the increase in peak flows for the 1
year and 2 year ARIs.
The decrease in peak flow for the 5 to 100 year ARIs for the post development scenario can
be attributed to the considerable decrease in slope of the site due to the development. XP-
Rafts utilises the Laurenson Method to calculate peak flows which specifically accounts for
slope and other parameters while also allowing for storage within the catchment.
2.3 Post Development Mitigated
Stormwater detention will need to be provided to ensure that the pre development peak
flows for the 1 and 2 year ARI’s listed in Table 2 are not exceeded for the proposed
development. It is proposed to provide detention storage at the following locations within
the development:
1. 503m3 within the open space area adjacent to the pool within Precinct F;
2. 67m3 within the stormwater reuse tank located in front of Building 4; and
3. 48m3 storage tank under the basement slab of Buildings 23, 24 and 25 for total
storage of 144m3.
Refer to the operational works drawings for the storage details.
Page 5
MORGAN CONSULTING
E NGINEERS P TY LTD
16003/CG
Page 5
The storage nodes were included in the post development XP-RAFTS model and the model
input parameters summarised in Table 1 have been maintained in the XP-RAFTS post
development mitigated model for each of the nodes as described above. Refer to the
enclosed Post Development Catchment Plan for details.
Table 4 summaries the post development mitigated peak discharges calculated by XP-RAFTS
for a range of design storms.
Table 4: XP-RAFTS Post Development Mitigated Peak Discharge
XP-RAFTS Post Development (Mitigated)
ARI
Peak Discharge
(Years)
(m3/s)
1 1.452 (1yr 25min storm)
2 1.832 (2yr 25min storm)
5 2.446 (5yr 25min storm)
10 2.718 (10yr 25min storm)
20 3.190 (20yr 25min storm)
50 3.370 (50yr 25min storm)
100 3.737 (100yr 25min storm)
Refer to the attached post development mitigated peak flow rate hydrographs from XP-
RAFTS.
A review of the XP-RAFTS results shown in Table 2 and Table 4 confirm the proposed
mitigation implemented within the development will maintain pre development flows (or
less) for all design storms except for the 1 year ARI.
The net increase in the 1 year ARI event flow from the development is 0.020m3/s which is
considered minor when compared to the total development flow. Although there is a minor
increase in flow, it should be noted that the development is 54% impervious which is
generally in keeping with the 50% imperviousness assumed in the master drainage plan
report. It should also be noted that the XP-RAFTS model has not taken into account the
storage provided in the bio-retention basins within the development, the long swales within
Catchments A and C or the extensive pipe network throughout the site.
The pipe drainage infrastructure in Resort Drive and the stormwater property connections to
the development have been designed for the minor (10 year ARI) storm event. The pipe
capacities and design flows have been included on the post development catchment plans
for reference. Based on this, there is sufficient capacity within the existing drainage
network to cater for the minor net increase in the 1 year ARI flow from the development.
Page 6
MORGAN CONSULTING
E NGINEERS P TY LTD
16003/CG
Page 6
3.0 Conclusion
RAFTS modelling confirmed that by implementing detention throughout the development
the post development discharge will be below pre development discharge for the 2, 5, 10,
20, 50 and 100 year ARIs.
Although XP-RAFT modelling confirmed there still remains a minor increase in the post
development 1 year ARI storm event flow further mitigation will be provided by the storage
within the extensive pipe network, bio-retention basins and swales within the development.
It has also been confirmed that the existing stormwater infrastructure and property
connections for the development within Resort Drive have been designed and have sufficient
capacity to cater for the post development 10 year ARI event flows. Therefore the minor
increase in the 1 year ARI can be catered for within the existing network.
Based on the analysis in this letter, all stormwater from the development will be collected,
mitigated and discharged via the existing pipe network in Resort Drive to ensure no harm to
the receiving natural and built environments.
Please contact me if you have any further queries on (07) 3369 8411.
Yours faithfully,
M ORGAN C ONSULTING E NGINEERS P TY LTD
Henry Morgan RPEQ 11950
Director
Page 7
Tiss — FREcmeT E2 poo F Pre Dévetormeny Catenment Detaus (<P-RAFT5) CATCHMENT CtCHYNT B A=2.29/ Ha S+ 114% Si 2 OK 2 0,03.
Page 8
Pre Dev [ALL STORMS]
Total Flow
1yr 10min max [0.624] 2yr 10min max [1.160] 1yr 15min max [0.894] 2yr 15min max [1.467]
1yr 20min max [1.183] 2yr 20min max [1.715] 1yr 25min max [1.432] 2yr 25min max [2.084]
1yr 30min max [1.317] 2yr 30min max [1.928] 1yr 45min max [1.114] 2yr 45min max [1.569]
1yr 60min max [1.420] 2yr 60min max [1.879] 1yr 90min max [1.126] 2yr 90min max [1.490]
1yr 120min max [1.046] 2yr 120min max [1.398] 1yr 180min max [0.817] 2yr 180min max [1.069]
1yr 270min max [0.715] 2yr 270min max [0.943] 1yr 360min max [0.527] 2yr 360min max [0.700]
1yr 540min max [0.509] 2yr 540min max [0.681] 1yr 720min max [0.520] 2yr 720min max [0.698]
1yr 1080min max [0.358] 2yr 1080min max [0.486] 1yr 1440min max [0.368] 2yr 1440min max [0.501]
1yr 2160min max [0.247] 2yr 2160min max [0.341] 1yr 2880min max [0.234] 2yr 2880min max [0.324]
1yr 4320min max [0.163] 2yr 4320min max [0.231]
2.0
Total Flow [cms]
1.5
1.0
0.5
0.0
0:30 1:00 1:30 2:00 2:30
1 Thu Jan 2015 Time
[OCR of page images]
Pe
yr 10min max [0.624]
tyr 20min max [1.183]
dyr 30min max [1.317]
Pre Dev [ALL STORMS]
Total Flow
Pt
2yr 10min max [1.160]
2yr 20min max [1.715]
2yr 30min max [1.928]
|
tyr 15min max [0.894]
tyr 25min max [1.432]
tyr 45min max [1.114]
PC
2yr 15min max [1.467]
2yr 25min max [2.084]
2yr 45min max [1.569]
Total Flow [cms]
o
a
yr 60min max [1.420] 2yr 6Omin max [1.879] yr 90min max [1.126] 2yr 90min max [1.490]
Fe ; PT
yr 120min max [1.046] 2yr120min max [1.398] lyr 180min max [0.817] 2yr 180min max [1.069]
| a
1yr 270min max [0.715] 2yr 270min max [0.943] 1yr 360min max [0.527]
2yr 360min max [0.700]
lyr 540min max [0.509] 2yr 540min max [0.681]
2yr 1080min max [0.486]
1yr 720min max [0.520]
tyr 1440min max [0.368]
2yr 720min max [0.698]
2yr 1440min max [0.501]
yr 1080min max [0.358]
dyr 2160min max [0.247] 2yr2160min max [0.341] 1yr2880min max [0.234]
2yr 2880min max [0.324]
1yr 4320min max [0.163]
2yr 4320min max [0.231]
N
°o
=
ol
=
oO
0.0
2:00
1 Thu Jan 2015
Page 9
Pre Dev [ALL STORMS]
Total Flow
5yr 10min max [1.713] 10yr 10min max [2.031] 5yr 15min max [2.190] 10yr 15min max [2.586]
5yr 20min max [2.241] 10yr 20min max [2.567] 5yr 25min max [2.769] 10yr 25min max [3.127]
5yr 30min max [2.575] 10yr 30min max [2.910] 5yr 45min max [2.081] 10yr 45min max [2.389]
5yr 60min max [2.398] 10yr 60min max [2.697] 5yr 90min max [1.934] 10yr 90min max [2.197]
5yr 120min max [1.842] 10yr 120min max [2.108] 5yr 180min max [1.398] 10yr 180min max [1.595]
5yr 270min max [1.254] 10yr 270min max [1.444] 5yr 360min max [0.945] 10yr 360min max [1.096]
5yr 540min max [0.934] 10yr 540min max [1.092] 5yr 720min max [0.968] 10yr 720min max [1.139]
5yr 1080min max [0.684] 10yr 1080min max [0.810] 5yr 1440min max [0.708] 10yr 1440min max [0.841]
5yr 2160min max [0.492] 10yr 2160min max [0.589] 5yr 2880min max [0.471] 10yr 2880min max [0.566]
5yr 4320min max [0.343] 10yr 4320min max [0.416]
3.0
2.5
Total Flow [cms]
2.0
1.5
1.0
0.5
0.0
1 Thu 1AM 2AM
Jan 2015 Time
[OCR of page images]
Total Flow [cms]
=
oO
o
a
0.0
1 Thu
a
Syr 10min max [1.713]
Syr 20min max [2.241]
Syr 30min = max [2.575]
Syr 60min max [2.398]
Syr 120min max [1.842]
fT
Syr 270min max [1.254]
Syr 540min max [0.934]
Syr 1080min max [0.684]
Syr 2160min max [0.492]
Syr 4320min max [0.343]
Pre Dev [ALL STORMS]
Total Flow
10yr 10min = max [2.031]
10yr 20min max [2.567]
10yr 30min = max [2.910]
10yr 6Omin max [2.697]
10yr 120min max [2.108]
10yr 270min max [1.444]
10yr 540min max [1.092]
10yr 1080min max [0.810]
10yr 2160min max [0.589]
10yr 4320min max [0.416]
Syr 15min max [2.190]
Syr 25min max [2.769]
fT
Syr 45min max [2.081]
Syr 90min max [1.934]
Syr 180min max [1.398]
Syr 360min max [0.945]
Syr 720min max [0.968]
Syr 1440min max [0.708]
Syr 2880min max [0.471]
10yr 15min max [2.586]
10yr 25min max [3.127]
10yr 45min = max [2.389]
10yr 90min max [2.197]
10yr 180min max [1.595]
10yr 360min max [1.096]
10yr 720min max [1.139]
10yr 1440min max [0.841]
10yr 2880min max [0.566]
Jan 2015
Page 10
Pre Dev [ALL STORMS]
Total Flow
20yr 10min max [2.435] 50yr 10min max [3.030] 20yr 15min max [3.100] 50yr 15min max [3.539]
20yr 20min max [3.026] 50yr 20min max [3.468] 20yr 25min max [3.603] 50yr 25min max [3.776]
20yr 30min max [3.355] 50yr 30min max [3.576] 20yr 45min max [2.809] 50yr 45min max [3.195]
20yr 60min max [3.109] 50yr 60min max [3.411] 20yr 90min max [2.555] 50yr 90min max [2.679]
20yr 120min max [2.468] 50yr 120min max [2.560] 20yr 180min max [1.856] 50yr 180min max [1.953]
20yr 270min max [1.693] 50yr 270min max [1.773] 20yr 360min max [1.292] 50yr 360min max [1.384]
20yr 540min max [1.297] 50yr 540min max [1.392] 20yr 720min max [1.360] 50yr 720min max [1.460]
20yr 1080min max [0.972] 50yr 1080min max [1.057] 20yr 1440min max [1.012] 50yr 1440min max [1.102]
20yr 2160min max [0.713] 50yr 2160min max [0.783] 20yr 2880min max [0.688] 50yr 2880min max [0.754]
20yr 4320min max [0.510] 50yr 4320min max [0.568]
3
Total Flow [cms]
2
1
0
1AM 2AM 3AM
1 Thu Jan 2015 Time
[OCR of page images]
20yr 10min max [2.435]
20yr 20min max [3.026]
20yr 30min max [3.355]
Pre Dev [ALL STORMS]
Total Flow
50yr 10min max [3.030]
50yr 20min max [3.468]
50yr 30min max [3.576]
20yr 15min max [3.100]
20yr 25min max [3.603]
20yr 45min max [2.809]
50yr 15min max [38.539]
50yr 25min max [3.776]
50yr 45min max [3.195]
Total Flow [cms]
Pe
20yr 60min max [3.109] 50yr 60min max [3.411] 20yr 90min max [2.555] 50yr 90min max [2.679]
Pe as ;
20yr 120min max [2.468] 50yr 120min max [2.560] 20yr 180min max [1.856] 50yr 180min max [1.953]
| a
20yr 270min max [1.693] 50yr 270min max [1.773] 20yr 360min max [1.292]
20yr 720min max [1.360]
50yr 360min max [1.384]
50yr 720min max [1.460]
20yr 540min max [1.297] 50yr 540min max [1.392]
20yr 1080min max [0.972] 50yr1080min max [1.057] 20yr1440min max[1.012] 50yr1440min max [1.102]
50yr 2160min max [0.783]
20yr 2160min max [0.713] 20yr 2880min max [0.688] 50yr 2880min max [0.754]
20yr 4320min max [0.510] 50yr4320min max [0.568]
oO
Nh
=
0
1 Thu Jan 2015
Time
Page 11
Pre Dev [ALL STORMS]
Total Flow
100yr 10min max [3.398] 100yr 15min max [4.021] 100yr 20min max [3.902] 100yr 25min max [4.186]
100yr 30min max [3.964] 100yr 45min max [3.584] 100yr 60min max [3.800] 100yr 90min max [3.002]
100yr 120min max [2.884] 100yr 180min max [2.193] 100yr 270min max [2.002] 100yr 360min max [1.569]
100yr 540min max [1.587] 100yr 720min max [1.671] 100yr 1080min max [1.215] 100yr 1440min max [1.268]
100yr 2160min max [0.906] 100yr 2880min max [0.873] 100yr 4320min max [0.662]
4.0
3.5
3.0
Total Flow [cms]
2.5
2.0
1.5
1.0
0.5
0.0
1AM 2AM 3AM
1 Thu Jan 2015 Time
[OCR of page images]
Total Flow [cms]
100yr 10min max [3.398]
100yr 30min max [3.964]
100yr 120min max [2.884]
100yr 540min max [1.587]
100yr 2160min max [0.906]
N
on
N
°o
=
o1
=
oO
Pre Dev [ALL STORMS]
Total Flow
Lt a
100yr 15min max [4.021] 100yr 20min max [3.902] 100yr 25min max [4.186]
100yr 45min max [3.584] 100yr 60min max [3.800] 100yr 90min max [3.002]
i
100yr 180min max [2.193] 100yr 270min max [2.002] 100yr 360min max [1.569]
Le
100yr 720min max [1.671] 100yr 1080min max [1.215] 100yr 1440min max [1.268]
a
100yr 2880min max [0.873] 100yr4320min max [0.662]
o
a
0.0
1 Thu Jan 2015
3AM
Time
Page 12
Catchment A
Aw = O14 L Ha
Stuy Bixler (AVG)
Aver = 0.572 Ha
”
9% (WA)
S per
$i = STH
“STV SAN
SS
STN
n
EXISTING
KERB AND CHANNEL
LOT BOUNDARY
CONTOUR MAJOR (1,00m
INTERVAL)
CONTOUR MINOR (0.50m
INTERVAL)
STORMWATER
DRAINAGE STRUCTURE ID
fi
N
oO
N]
Oo
oO}
CATCHMENT | CATCHMENT S|
NAME | AREA (ha) g
Wy
t/t ost 3 a
Oo}
2“ ied CATCHMENT | CATCHMENT 2 5 PROPOSED
wi o08e NAME) A TAREA) (ha) YS LLLLLLLL LZ — BUILDING EXTENT
1 aol - CONTOUR MAJOR {1.00m
“ 0.066 8/5 a.go6 i Bl 310: ea
10/1 0.122 1410 a022 N CONTOUR MINOR (0.25m
WA i i x xs INTERVAL)
ee |) aeR ual star? CATCHMENT | CATCHMENT ia ena
2/1 0.036 v2 162 ABNER (RAZ AM (bol
wer 0.043 wu ooa. ivi 0029 bh Seen
ae [Cs concrete pavement
a2 om vis 1107 L2At 0026 CATCHMENT | CATCHMENT :
ws foes ae oe ae 027 NAME | AREA {ha} CROSSOVER/FOOTPATH
va aca 13720 0.073 L6/1 o.082 wy 0023 & CATCHMENT
ash 0.053 V2 0030 twos) o097 L&/7 0060
Y” DRAINAGE STRUCTURE ID
3/4 an 1/22 0.01% v2 0.277 ss? 0.035
aye 0.075 1/23 0.039 L272 0.225 2-9 0029 Re eee eet CATCHMENT,
5/4 0.068 28 0.023 \6/2 0.224 Last 0.056 LANDSCAPING
4 01866 1 0020 uve on? SAL 0.069
8/ 725 | ooze L —> —> _ swate
9/6 0.020 126 0.017 13/5 0.040 ree 0.067
w/t 0.008 1/28 00s Lars 0.205 16/20 0.236
v5 0.026 29 0091 L545 079 Lay2a Owe
vs 0.028 2/28 0.028 uve oxo L1a/20 0163 COPTCHMENT és
4/5 0.026 1/30 0.043 uw? oo7a 112/20 002% A
MS 0076 2/30 0.028 12-7 0.058 Lv2e a.010 WP 2 0.297 Hy
Siu = ¥
P= U.8% Ava) a 5 20 30
NOTE: NOTE: Apes = O39 fa been td pe
REFER DRAWING 16003/C10-C15 FOR REFER DRAWING 16003/C22-C24 ‘ SCALE 1:500 {A1 SIZE)
SITEWORKS AND DRAINAGE PLAN FOR STORMWATER LONGITUDINAL s 2
ANO DETAILS SECTIONS. S per Bo%X% Ce)
fi = 49x
Tart a (07) 3369 8411 [Semele Pama Diary oe
ALTUM CONSTRUCTIONS #5 (07) 3369 1893 AS SER PROPOSED RESIDENTIAL STORMWATER CATCHMENT
E: [email protected] |") penes
HM HM DEVELOPMENT
To Delt nae tebe apes, Pm ue @ I PLAN SHEET 1
eutained of ured without the i" AUG f
SRT Cony DGnanoitamenmes ececnclumcsran ae PRECINCT F AnD €2 NOOSA ||[POST DévEeverMenT
1 Great Georce Street eares SPRINGS, NOOSA HEADS Preere
DATE | BY ||COnE Paooincton Quo 4064 PEO
Page 13
Cre SPACE Weeume SOB pe STORAGE Yotumé —
(bo fi. REUSE Reto») Prisma lo Fro! POPE
Gfooma Hian Few PIFE
TANK ~ Se X BAe k [hoon
bres low Femo PE
poo HGH Flour FIVE
EXISTING
wanenenennne KERB AND CHANNEL
LOT BOUNDARY
CONTOUR MAJOR [100m
INTERVAL)
CONTOUR MINOR (0.50m
INTERVAL)
— — —— $v — STORMWATER
{ “ DRAINAGE STRUCTURE ID
3x Wu? Tanes (ymax % */.Sin)
fiios wha. Cows Flows OUTS
P20 am MGH FtrvS Atl
16006/C20
IN
PROPOSED
LLELLLL ALL BUILDING EXTENT
CONTOUR MAJOR (1.00m
a INTERVAL)
CONTOUR MINOR (0.25m
INTERVAL]
LOT BOUNDARY
sw STORMWATER
CONCRETE PAVEMENT
CROSSOVER/FOOTPATH
CATCHMENT WD
ORAINAGE STRUCTURE ID
|
SY
—e
Barna ey ee
\ \
— oe oe CATCHMENT
Arup s SSS Hq
Sure 7.5% (Ave)
|
LANDSCAPING,
> ——— swale
— Carcmmest C
on Aces O41 He
'
gy 3 Amr = 1.35% 44 Spee*® /7./ y (ave)
NOTE: NOTE: Sude SK (AvG) Gi= 57%
¢ 5 9 340 SITEWORKS. AND DRAINAGE PLAN. Fok STORMWATER LONGITUDINAL as / oe,
soe AND DETARS SECTIONS.
Pen = (7S UG
SCALE 1:500 [A1 SIZE} fe
fy = S8% y)
covet P: (07) 3369 8411 Tas Five Drang ew
ALTUM CONSTRUCTIONS Bs \ (07) 3369 1493 | S PROPOSED RESIDENTIAL STORMWATER CATCHMENT
CONSULTING Siencomatay totes f= tM _|]DEVELOPMENT PLAN - SHEET 2
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Page 14
Post Dev [ALL STORMS]
Total Flow
1yr 10min max [1.115] 2yr 10min max [1.414] 1yr 15min max [1.380] 2yr 15min max [1.931]
1yr 20min max [1.237] 2yr 20min max [1.791] 1yr 25min max [1.622] 2yr 25min max [2.126]
1yr 30min max [1.497] 2yr 30min max [1.967] 1yr 45min max [1.134] 2yr 45min max [1.628]
1yr 60min max [1.493] 2yr 60min max [1.958] 1yr 90min max [1.254] 2yr 90min max [1.637]
1yr 120min max [1.166] 2yr 120min max [1.543] 1yr 180min max [0.815] 2yr 180min max [1.068]
1yr 270min max [0.719] 2yr 270min max [0.949] 1yr 360min max [0.545] 2yr 360min max [0.719]
1yr 540min max [0.527] 2yr 540min max [0.699] 1yr 720min max [0.535] 2yr 720min max [0.716]
1yr 1080min max [0.377] 2yr 1080min max [0.506] 1yr 1440min max [0.388] 2yr 1440min max [0.521]
1yr 2160min max [0.268] 2yr 2160min max [0.362] 1yr 2880min max [0.254] 2yr 2880min max [0.345]
1yr 4320min max [0.183] 2yr 4320min max [0.251]
2.0
Total Flow [cms]
1.5
1.0
0.5
0.0
1 Thu 1AM 2AM 3AM
Jan 2015 Time
[OCR of page images]
N
°o
=
o1
=
oO
Total Flow [cms]
Pe
yr 10min max [1.115]
dyr 20min max [1.237]
dyr 30min max [1.497]
lyr 60min max [1.493]
PT
Tyr 120min max [1.166]
1yr 270min max [0.719]
1yr 540min max [0.527]
yr 1080min max [0.377]
1yr 2160min max [0.268]
1yr 4320min max [0.183]
Post Dev [ALL STORMS]
Total Flow
_
2yr 10min max [1.414]
2yr 20min max [1.791]
2yr 30min max [1.967]
;
2yr 60min max [1.958]
;
2yr 120min max [1.543]
2yr 270min max [0.949]
2yr 540min max [0.699]
2yr 1080min max [0.506]
2yr 2160min max [0.362]
2yr 4320min max [0.251]
tyr 15min max [1.380]
dyr 25min max [1.622]
dyr 45min max [1.134]
dyr 90min max [1.254]
lyr 180min max [0.815]
lyr 360min max [0.545]
1yr 720min max [0.535]
tyr 1440min max [0.388]
1yr 2880min max [0.254]
Jan 2015
Le
2yr 15min max [1.931]
2yr 25min max [2.126]
2yr 45min max [1.628]
2yr 90min max [1.637]
pT
2yr 180min max [1.068]
2yr 360min max [0.719]
2yr 720min max [0.716]
2yr 1440min max [0.521]
2yr 2880min max [0.345]
Page 15
Post Dev [ALL STORMS]
Total Flow
5yr 10min max [1.751] 10yr 10min max [1.963] 5yr 15min max [2.481] 10yr 15min max [2.780]
5yr 20min max [2.381] 10yr 20min max [2.696] 5yr 25min max [2.696] 10yr 25min max [3.022]
5yr 30min max [2.500] 10yr 30min max [2.806] 5yr 45min max [2.124] 10yr 45min max [2.391]
5yr 60min max [2.481] 10yr 60min max [2.780] 5yr 90min max [2.092] 10yr 90min max [2.356]
5yr 120min max [2.002] 10yr 120min max [2.272] 5yr 180min max [1.396] 10yr 180min max [1.593]
5yr 270min max [1.262] 10yr 270min max [1.452] 5yr 360min max [0.964] 10yr 360min max [1.115]
5yr 540min max [0.952] 10yr 540min max [1.111] 5yr 720min max [0.986] 10yr 720min max [1.157]
5yr 1080min max [0.704] 10yr 1080min max [0.830] 5yr 1440min max [0.728] 10yr 1440min max [0.861]
5yr 2160min max [0.512] 10yr 2160min max [0.609] 5yr 2880min max [0.491] 10yr 2880min max [0.586]
5yr 4320min max [0.363] 10yr 4320min max [0.436]
3.0
2.5
Total Flow [cms]
2.0
1.5
1.0
0.5
0.0
1 Thu 1AM 2AM 3AM
Jan 2015 Time
[OCR of page images]
N
°
=
oa
=
oO
Total Flow [cms]
o
a
0.0
Syr 10min max [1.751]
Syr 20min max [2.381]
Syr 30min max [2.500]
Syr 60min max [2.481]
Syr 120min max [2.002]
fT
Syr 270min max [1.262]
Syr 540min max [0.952]
Syr 1080min max [0.704]
Syr 2160min max [0.512]
Syr 4320min max [0.363]
Post Dev [ALL STORMS]
Total Flow
10yr 10min max [1.963]
10yr 20min max [2.696]
10yr 30min max [2.806]
10yr 6Omin max [2.780]
_
10yr 120min max [2.272]
10yr 270min max [1.452]
10yr 540min max [1.111]
10yr 1080min max [0.830]
10yr 2160min max [0.609]
10yr 4320min max [0.436]
Syr 15min max [2.481]
Syr 25min max [2.696]
fT
Syr 45min max [2.124]
Syr 90min max [2.092]
Syr 180min max [1.396]
Syr 360min max [0.964]
Syr 720min max [0.986]
Syr 1440min max [0.728]
Syr 2880min max [0.491]
1 Thu
Jan 2015
10yr 15min max [2.780]
10yr 25min max [3.022]
10yr 45min max [2.391]
10yr 90min max [2.356]
10yr 180min max [1.593]
10yr 360min max [1.115]
10yr 720min max [1.157]
10yr 1440min max [0.861]
10yr 2880min max [0.586]
Page 16
Post Dev [ALL STORMS]
Total Flow
20yr 10min max [2.260] 50yr 10min max [2.809] 20yr 15min max [3.190] 50yr 15min max [3.516]
20yr 20min max [3.120] 50yr 20min max [3.410] 20yr 25min max [3.473] 50yr 25min max [3.647]
20yr 30min max [3.228] 50yr 30min max [3.438] 20yr 45min max [2.758] 50yr 45min max [3.061]
20yr 60min max [3.189] 50yr 60min max [3.493] 20yr 90min max [2.722] 50yr 90min max [2.827]
20yr 120min max [2.639] 50yr 120min max [2.718] 20yr 180min max [1.854] 50yr 180min max [1.953]
20yr 270min max [1.701] 50yr 270min max [1.783] 20yr 360min max [1.311] 50yr 360min max [1.403]
20yr 540min max [1.316] 50yr 540min max [1.410] 20yr 720min max [1.378] 50yr 720min max [1.479]
20yr 1080min max [0.992] 50yr 1080min max [1.077] 20yr 1440min max [1.032] 50yr 1440min max [1.121]
20yr 2160min max [0.733] 50yr 2160min max [0.803] 20yr 2880min max [0.708] 50yr 2880min max [0.774]
20yr 4320min max [0.530] 50yr 4320min max [0.588]
3
Total Flow [cms]
2
1
0
1 Thu 1AM 2AM 3AM
Jan 2015 Time
[OCR of page images]
20yr 10min max [2.260]
20yr 20min max [3.120]
20yr 30min max [3.228]
Post Dev [ALL STORMS]
Total Flow
50yr 10min max [2.809]
50yr 20min max [3.410]
50yr 30min max [3.438]
20yr 15min max [3.190]
20yr 25min max [3.473]
20yr 45min max [2.758]
50yr 15min max [3.516]
50yr 25min max [3.647]
50yr 45min max [3.061]
Pe
20yr 60min max [3.189] 50yr 60min max [3.493] 20yr 90min max [2.722] 50yr 90min max [2.827]
Pe as ;
20yr 120min max [2.639] 50yr 120min max [2.718] 20yr 180min max [1.854] 50yr 180min max [1.953]
| a
20yr 270min max [1.701] 50yr 270min max [1.783] 20yr 360min max [1.311]
20yr 720min max [1.378]
50yr 360min max [1.403]
50yr 720min max [1.479]
20yr 540min max [1.316] 50yr 540min max [1.410]
20yr 1080min max [0.992] 50yr1080min max [1.077] 20yr1440min max [1.032] 50yr1440min max [1.121]
50yr 2160min max [0.803]
20yr 2160min max [0.733] 20yr 2880min max [0.708] 50yr 2880min max [0.774]
20yr 4320min max [0.530]
50yr 4320min max [0.588]
oO
1
Total Flow [cms]
No
4 Thu 2AM 3AM
Jan 2015
Page 17
Post Dev [ALL STORMS]
Total Flow
100yr 10min max [3.125] 100yr 15min max [3.907] 100yr 20min max [3.792] 100yr 25min max [4.050]
100yr 30min max [3.820] 100yr 45min max [3.412] 100yr 60min max [3.880] 100yr 90min max [3.154]
100yr 120min max [3.047] 100yr 180min max [2.193] 100yr 270min max [2.012] 100yr 360min max [1.588]
100yr 540min max [1.605] 100yr 720min max [1.690] 100yr 1080min max [1.234] 100yr 1440min max [1.288]
100yr 2160min max [0.926] 100yr 2880min max [0.893] 100yr 4320min max [0.682]
4.0
3.5
3.0
Total Flow [cms]
2.5
2.0
1.5
1.0
0.5
0.0
1AM 2AM 3AM
1 Thu Jan 2015 Time
[OCR of page images]
Total Flow [cms]
NON
oO oa
=
oa
1.0
0.5
0.0
|
Py eee
100yr 10min max [3.125]
100yr 30min max [3.820]
100yr 120min max [3.047]
100yr 540min max [1.605]
100yr 2160min max [0.926]
Post Dev [ALL STORMS]
Total Flow
100yr 15min max [3.907]
100yr 45min max [3.412]
100yr 180min max [2.193] 100yr 270min = max [2.012]
100yr 720min max [1.690] 100yr 1080min max [1.234]
100yr 2880min max [0.893] 100yr4320min max [0.682]
100yr 20min max [3.792] 100yr 25min max [4.050]
100yr 60min max [3.880] 100yr 90min max [3.154]
100yr 360min max [1.588]
100yr 1440min max [1.288]
1 Thu Jan 2015
1AM 2AM
Time
3AM
Page 18
Post Dev [ALL STORMS]
Total Flow
1yr 10min max [0.918] 2yr 10min max [1.253] 1yr 15min max [1.217] 2yr 15min max [1.679]
1yr 20min max [1.087] 2yr 20min max [1.555] 1yr 25min max [1.452] 2yr 25min max [1.832]
1yr 30min max [1.349] 2yr 30min max [1.739] 1yr 45min max [1.007] 2yr 45min max [1.434]
1yr 60min max [1.356] 2yr 60min max [1.764] 1yr 90min max [1.150] 2yr 90min max [1.540]
1yr 120min max [1.069] 2yr 120min max [1.397] 1yr 180min max [0.785] 2yr 180min max [1.038]
1yr 270min max [0.697] 2yr 270min max [0.917] 1yr 360min max [0.538] 2yr 360min max [0.707]
1yr 540min max [0.521] 2yr 540min max [0.688] 1yr 720min max [0.527] 2yr 720min max [0.702]
1yr 1080min max [0.376] 2yr 1080min max [0.503] 1yr 1440min max [0.388] 2yr 1440min max [0.519]
1yr 2160min max [0.267] 2yr 2160min max [0.362] 1yr 2880min max [0.254] 2yr 2880min max [0.345]
1yr 4320min max [0.185] 2yr 4320min max [0.251]
1.5
Total Flow [cms]
1.0
0.5
0.0
1 Thu 1AM 2AM 3AM
Jan 2015 Time
[OCR of page images]
Total Flow [cms]
=
o1
=
oO
PC
yr 10min max [0.918]
dyr 20min max [1.087]
dyr 30min max [1.349]
tyr 60min max [1.356]
PT
yr 120min max [1.069]
|
1yr 270min max [0.697]
tyr 540min max [0.521]
lyr 1080min max [0.376]
1yr 2160min max [0.267]
1yr 4320min max [0.185]
Post Dev [ALL STORMS]
Total Flow
Pt
2yr 10min max [1.253]
2yr 20min max [1.555]
2yr 30min max [1.739]
|
2yr 6Omin max [1.764]
;
2yr120min max [1.397]
2yr 270min max [0.917]
2yr 540min max [0.688]
2yr 1080min max [0.503]
2yr 2160min max [0.362]
2yr 4320min max [0.251]
1yr 15min max [1.217]
tyr 25min max [1.452]
|
tyr 45min max [1.007]
yr 90min max [1.150]
yr 180min max [0.785]
1yr 360min max [0.538]
1yr 720min max [0.527]
tyr 1440min max [0.388]
1yr 2880min max [0.254]
Jan 2015
PC
2yr 15min max [1.679]
2yr 25min max [1.832]
2yr 45min max [1.434]
2yr 90min max [1.540]
pT
2yr 180min max [1.038]
2yr 360min max [0.707]
2yr 720min max [0.702]
2yr 1440min max [0.519]
2yr 2880min max [0.345]
3AM
Page 19
Post Dev [ALL STORMS]
Total Flow
5yr 10min max [1.611] 10yr 10min max [1.724] 5yr 15min max [2.047] 10yr 15min max [2.402]
5yr 20min max [2.015] 10yr 20min max [2.184] 5yr 25min max [2.446] 10yr 25min max [2.718]
5yr 30min max [2.223] 10yr 30min max [2.607] 5yr 45min max [1.832] 10yr 45min max [2.001]
5yr 60min max [2.238] 10yr 60min max [2.543] 5yr 90min max [1.834] 10yr 90min max [2.086]
5yr 120min max [1.841] 10yr 120min max [2.047] 5yr 180min max [1.386] 10yr 180min max [1.498]
5yr 270min max [1.250] 10yr 270min max [1.421] 5yr 360min max [0.970] 10yr 360min max [1.128]
5yr 540min max [0.954] 10yr 540min max [1.125] 5yr 720min max [0.994] 10yr 720min max [1.173]
5yr 1080min max [0.698] 10yr 1080min max [0.848] 5yr 1440min max [0.734] 10yr 1440min max [0.880]
5yr 2160min max [0.512] 10yr 2160min max [0.608] 5yr 2880min max [0.491] 10yr 2880min max [0.586]
5yr 4320min max [0.363] 10yr 4320min max [0.436]
2.5
2.0
Total Flow [cms]
1.5
1.0
0.5
0.0
1AM 2AM 3AM
1 Thu Jan 2015 Time
[OCR of page images]
Total Flow [cms]
O° a ° a
o
a
0.0
Syr 10min max [1.611]
Syr 20min max [2.015]
Syr 30min = max [2.223]
Syr 60min = max [2.238]
Syr 120min max [1.841]
fT
Syr 270min max [1.250]
Syr 540min max [0.954]
Syr 1080min max [0.698]
Syr 2160min max [0.512]
Syr 4320min max [0.363]
Post Dev [ALL STORMS]
Total Flow
a
10yr 10min max [1.724]
10yr 20min max [2.184]
10yr 30min = max [2.607]
10yr 6Omin = max [2.543]
10yr 120min max [2.047]
10yr 270min max [1.421]
10yr 540min max [1.125]
10yr 1080min max [0.848]
10yr 2160min max [0.608]
10yr 4320min max [0.436]
Syr 15min max [2.047]
Syr 25min max [2.446]
Syr 45min max [1.832]
Syr 90min max [1.834]
Syr 180min max [1.386]
Syr 360min max [0.970]
Syr 720min max [0.994]
Syr 1440min max [0.734]
Syr 2880min max [0.491]
1 Thu Jan 2015
1AM
i
10yr 15min = max [2.402]
10yr 25min max [2.718]
10yr 45min = max [2.001]
10yr 90min max [2.086]
10yr 180min max [1.498]
10yr 360min max [1.128]
10yr 720min max [1.173]
10yr 1440min max [0.880]
10yr 2880min max [0.586]
Page 20
Post Dev [ALL STORMS]
Total Flow
20yr 10min max [2.033] 50yr 10min max [2.540] 20yr 15min max [2.739] 50yr 15min max [3.216]
20yr 20min max [2.667] 50yr 20min max [2.908] 20yr 25min max [3.190] 50yr 25min max [3.370]
20yr 30min max [2.919] 50yr 30min max [3.194] 20yr 45min max [2.377] 50yr 45min max [2.610]
20yr 60min max [2.964] 50yr 60min max [3.241] 20yr 90min max [2.464] 50yr 90min max [2.593]
20yr 120min max [2.357] 50yr 120min max [2.461] 20yr 180min max [1.767] 50yr 180min max [1.888]
20yr 270min max [1.645] 50yr 270min max [1.737] 20yr 360min max [1.316] 50yr 360min max [1.403]
20yr 540min max [1.351] 50yr 540min max [1.384] 20yr 720min max [1.358] 50yr 720min max [1.477]
20yr 1080min max [1.016] 50yr 1080min max [1.089] 20yr 1440min max [1.055] 50yr 1440min max [1.158]
20yr 2160min max [0.745] 50yr 2160min max [0.828] 20yr 2880min max [0.715] 50yr 2880min max [0.786]
20yr 4320min max [0.530] 50yr 4320min max [0.588]
3.0
2.5
Total Flow [cms]
2.0
1.5
1.0
0.5
0.0
0:30 1:00 1:30 2:00 2:30
1 Thu Jan 2015 Time
[OCR of page images]
Total Flow [cms]
20yr 10min max [2.033]
20yr 20min max [2.667]
20yr 30min max [2.919]
20yr 60min max [2.964]
Lt
20yr 120min max [2.357]
—
20yr 270min max [1.645]
20yr 540min max [1.351]
20yr 1080min max [1.016]
20yr 2160min max [0.745]
20yr 4320min max [0.530]
Post Dev [ALL STORMS]
Total Flow
5Oyr 10min max [2.540]
5Oyr 20min max [2.908]
50yr 30min max [3.194]
5Oyr 60min max [3.241]
_
50yr 120min max [2.461]
5O0yr 270min max [1.737]
5O0yr 540min max [1.384]
5Oyr 1080min max [1.089]
5Oyr 2160min max [0.828]
5O0yr 4320min max [0.588]
20yr 15min max [2.739]
20yr 25min max [3.190]
20yr 45min max [2.377]
20yr 90min max [2.464]
20yr 180min max [1.767]
20yr 360min max [1.316]
20yr 720min max [1.358]
20yr 1440min max [1.055]
20yr 2880min max [0.715]
1 Thu Jan 2015
5Oyr 15min max [3.216]
S5Oyr 25min max [3.370]
SOyr 45min max [2.610]
5Oyr 90min max [2.593]
5Oyr 180min max [1.888]
5Oyr 360min max [1.403]
SOyr 720min max [1.477]
50yr 1440min max [1.158]
50yr 2880min max [0.786]
Page 21
Post Dev [ALL STORMS]
Total Flow
100yr 10min max [2.839] 100yr 15min max [3.560] 100yr 20min max [3.260] 100yr 25min max [3.737]
100yr 30min max [3.532] 100yr 45min max [3.137] 100yr 60min max [3.602] 100yr 90min max [2.922]
100yr 120min max [2.834] 100yr 180min max [2.106] 100yr 270min max [1.987] 100yr 360min max [1.587]
100yr 540min max [1.637] 100yr 720min max [1.678] 100yr 1080min max [1.278] 100yr 1440min max [1.314]
100yr 2160min max [0.947] 100yr 2880min max [0.916] 100yr 4320min max [0.690]
3.5
3.0
2.5
Total Flow [cms]
2.0
1.5
1.0
0.5
0.0
1 Thu 1AM 2AM 3AM
Jan 2015 Time
[OCR of page images]
Total Flow [cms]
100yr 10min max [2.839]
100yr 30min max [3.532]
100yr 120min max [2.834]
100yr 540min max [1.637]
100yr 2160min max [0.947]
N
on
N
°o
=
o1
1.0
0.5
Post Dev [ALL STORMS]
Total Flow
100yr 15min max [3.560]
100yr 45min max [3.137]
100yr 20min max [3.260] 100yr 25min max [3.737]
100yr 60min max [3.602] 100yr 90min max [2.922]
100yr 180min max [2.106] 100yr 270min max [1.987] 100yr 360min max [1.587]
100yr 720min max [1.678] 100yr 1080min max [1.278] 100yr 1440min max [1.314]
100yr 2880min max [0.916] 100yr4320min max [0.690]
Yl
0.0-4
1 Thu
Jan 2015
1AM
eee
oo MN b, —_———)
md SSS
—_
2AM 3AM
Time
Used in these records
17155 - Stormwater Quantity Assessment Letter - Rev 0.pdfRelated documentApplication case desk ↗
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