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PROJECT NO. xxx
INSERT DATE
PROJECT NO. C912
APRIL 2020
ENGINEERING SERVICES REPORT
AVONCORE HOUSING DEVELOPMENT
MIDLETON, CO. CORK
ENGINEERING SERVICES
REPORT
for
AVONCORE HOUSING DEVELOPEMNT,
MIDLETON, CO. CORK
NOTICE
DOCUMENT CONTROL & HISTORY
OCSC
Job
No.:
C912
Pro
ject
Co
de
Orig
inato
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Zo
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Vo
lum
e
Level
Fil
e T
yp
e
Ro
le T
yp
e
Nu
mb
er
Sta
tus
/
Su
itab
ilit
y
Co
de
Revis
ion
C912 OCSC XX XX RP C 0001 A1 C01
Rev. Status Authors Checked Authorised Issue Date
C01 A1 IOM JMcB JMcB April 2020
This document has been produced by O’Connor Sutton Cronin & Associates for its client
Cork County Council. It may not be used for any purpose other than that specified by
any other person without the written permission of the authors.
ENGINEERING SERVICES REPORT
AVONCORE HOUSING DEVELOPMENT, MIDLETON, CO. CORK
April 2020
TABLE OF CONTENTS PAGE
1 INTRODUCTION ................................................................................. 1
1.1 Appointment ................................................................................................................................... 1
1.2 Administrative Jurisdiction ............................................................................................ 1
1.3 Site Location ................................................................................................................. 1
1.4 Limitations .................................................................................................................... 3
2 FOUL WATER DRAINAGE ..................................................................... 4
2.1 Existing Foul Drainage ................................................................................................... 4
2.2 Proposed Foul Sewer ..................................................................................................... 5
3 STORM WATER DRAINAGE .................................................................. 7
3.1 Overview ...................................................................................................................... 7
3.2 Existing Drainage Infrastructure ..................................................................................... 7
3.3 Proposed Surface Water Design ..................................................................................... 8
3.4 Specific SuDS Measures Proposed. ................................................................................. 9
4 WATER SUPPLY ................................................................................ 11
4.1 Existing Watermain Layout .......................................................................................... 11
4.2 Proposed Watermain Layout ....................................................................................... 12
5 ROAD NETWORK .............................................................................. 14
5.1 Site Access .................................................................................................................. 14
5.2 Internal Arrangements ................................................................................................ 14
6 FLOODING ...................................................................................... 15
APPENDICES
IRISH WATER FEASIBLITY LETTER
FOUL WATER DESIGN CALCULATIONS
STORM WATER CALCULATIONS
SUSTAINABLE URBAN DRAINAGE SYSTEMS
WATER NETWORK CAPACITY
FLOOD MAPS
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
1 Project No. C912 Issued: 04/2020
ENGINEERING SERVICES REPORT
AVONCORE HOUSING DEVELOPMENT, MIDLETON, CO. CORK
APRIL 2020
1 INTRODUCTION
1.1 Appointment
O’Connor Sutton Cronin (OCSC) have been instructed to prepare an Engineering
Services Report in support of a social housing development at the proposed site
at the existing Avoncore estate, Midleton, Co. Cork. The development consists of
9No. 2 bed, two storey dwellings, 6No. 3 bed, two storey dwellings, 1No. 4 bed,
two storey dwellings and all associated site works.
1.2 Administrative Jurisdiction
The site is located within the administrative jurisdiction of Cork County Council,
whose offices are located at County Hall, Carrigrohane Road, Cork.
1.3 Site Location
The subject site is located south east of the town centre of Carrigaline,
approximately 1km north of Midleton town centre. Refer to Figure 1 below for
details of the site location.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
2 Project No. C912 Issued: 04/2020
Figure 1 -Site Location.
Located within the existing Avoncore estate, the site is approximately 45m in width
and 115m in length. The total site is 0.5125 Ha in area. A masonry wall and
overgrown hedgerow define the site boundary to the east, while existing property
boundary walls define the boundaries to the south and west. A recently erected
fence has been installed along the north boundary.
The site is located within the existing Avoncore estate and so the surrounding area
is predominantly residential in nature. The road network to the west connects this
area to the town centre of Midleton.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
3 Project No. C912 Issued: 04/2020
1.4 Limitations
This Engineering Services Report has been prepared for the sole use of Cork
County Council. No other warranty, expressed or implied, is made as to the
professional advice included in this report or any other services provided by OCSC.
This report may not be disclosed by the Client nor relied upon by any other party
without the prior and express written agreement of OCSC.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
4 Project No. C912 Issued: 04/2020
2 FOUL WATER DRAINAGE
2.1 Existing Foul Drainage
As part of the initial scheme design, Irish Water and Local Area Engineers within
Cork County Council were contacted to establish the existing Foul Water sewer
network in the vicinity of the proposed development.
There is an existing Irish Water Foul Sewer serving the existing Avoncore estate
in the access road (L-7707) on approach to the site at the northern boundary.
Irish Water and Cork County Council records also indicate a sewer running along
the eastern boundary of the site. Refer to Figure 2 below for details (foul water
sewer indicated in red).
Figure 2: Existing Foul Sewer.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
5 Project No. C912 Issued: 04/2020
2.2 Proposed Foul Sewer
A new foul drainage network will be required for the development and will be in
accordance with IS EN 752, The Building Regulations Part H and the Irish Water
Code of Practice for Wastewater. It is proposed to provide a gravity sewer from
the site to the existing sewer network. Due to the levels of the existing site and
the inverts of the existing sewer network, it is required to discharge to the
manhole approximately 60m west of the site at the junction with Elm Grove. All
gravity sewers will be HDPE and will range in size from 100mm to 150mm
diameter.
The development will generate a dry weather flow of 0.111 l/sec and a peak flow
of 0.666 l/sec. This is based upon the guidance given in section 3.6 of The Irish
Water Code of Practice for Wastewater.
16No. Units @ 600l/dwelling/day = 9600 l / day
= 0.111 l / sec (DWF)
Sewer Designed For (6*DWF) = 0.666 l / sec (6DWF)
The outfall pipe from the development is a 150mm diameter pipe laid at a gradient
of approximately 1:150, which gives a capacity of 12.61 litres / second. Therefore,
there is adequate capacity within the foul sewer network.
A Pre-Connection Enquiry Form has been submitted to Irish Water for the
proposed development and a Confirmation of Feasibility Letter has been received.
Irish Water confirmed that the existing Waste Water Treatment Plant serving the
Midleton area currently has insufficient capacity to cater for the proposed
development, however a connection will be facilitated in the future following the
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
6 Project No. C912 Issued: 04/2020
upgrade of the infrastructure. The foul water drainage network will be designed to
suit the upgraded Irish Water infrastructure through the connection process once
upgrade works are complete. Refer to Appendix A for details of Irish Water
correspondence.
The Foul Water drainage layout is provided on drawing C912-OCSC-XX-XX-DR-C-
0011 with Foul Water Sewer calculations provided in Appendix B.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
7 Project No. C912 Issued: 04/2020
3 STORM WATER DRAINAGE
3.1 Overview
The storm water drainage elements of the planning permission sought on the
subject lands is designed in accordance with IS EN 752 & The Building Regulations
Part H.
All new developments must ensure that a comprehensive sustainable urban
drainage system, SuDS, is incorporated into the development. SuDS requires that
post development run-off rates are maintained at equivalent or lower, levels that
pre-development levels. Thus the development must be able to retain, within its
boundaries, storm water volumes from extreme storm events up to a 1 in 100
year storm event, more commonly expressed as a 1.0% AEP (Annual Exceedance
Probability). Any new development must have the physical capacity to retain
storm water volumes and, if necessary release these attenuated surface water
volumes to an outfall at a controlled flow rate.
A further component of the SuDS protocols is to increase the overall water quality
of surface water runoff before in enters a natural water course or into a public
sewer, which ultimately discharges to a water body. This is to ensure the highest
possible standard of storm water quality and to prevent degradation of the water
course resource by contamination.
3.2 Existing Drainage Infrastructure
As part of the initial scheme design, the Local Area Engineer within Cork County
Council was contacted to establish if there is an existing Storm Water drainage
network in the vicinity of the proposed development.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
8 Project No. C912 Issued: 04/2020
An existing Storm Water drain was identified serving the existing Avoncore estate
on the access road (L-7707) on approach to the site at the northern boundary.
Refer to Figure 3 below for details (storm water drain indicated in blue).
Figure 3: Existing Storm Sewer.
3.3 Proposed Surface Water Design
All surface water drainage is proposed to discharge to the existing public drainage
network. Due to the levels of the existing site and the inverts of the existing
drainage network, it is required to discharge to the manhole approximately 60m
west of the site at the junction with Elm Grove via an attenuation tank and flow
control device to restrict outflows from the site to the equivalent Greenfield run-
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
9 Project No. C912 Issued: 04/2020
off rate, which has been calculated as 4.3 litres per second. This is based on an
overall site area of approximately 0.5125 hectares.
The proposed surface water network will consist of a new gravity feed sewer
system designed in accordance with IS EN 752. The pipes will be HDPE and will
be 225mm in diameter.
The Surface Water drainage layout is shown on drawing C912-OCSC-XX-XX-DR-
C-0011 with Surface Water Sewer calculations provided in Appendix C.
3.4 Specific SuDS Measures Proposed.
There are a number of systems available to address the SuDS requirements for
new developments. The site was tested in accordance with BRE 365 for direct
discharge to groundwater, however the infiltration rates for the site, were such
that direct infiltration to the ground was not feasible. The potential of discharging
storm water to groundwater was also discussed with Cork County Council Local
Engineers and given the nature of the geology in the Midleton area, soakaway
systems were deemed to be unsuitable.
It is proposed that, as a minimum, the following mechanisms will be considered
and incorporated into the SuDS surface water management regime.
• Attenuated Storage is proposed to be provided in the form of a reinforced
concrete underground storage tank for events up to, and including the 1.0%
AEP rainfall event with climate change allowance of 10%. The overall tank
dimensions are 14m long by 11.5m wide by 1.15m deep. The maximum
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
10 Project No. C912 Issued: 04/2020
TWL in the tank is a minimum of 500mm below the lowest FFL of any unit
within the site and has a minimum storage capacity of 185m3.
• A By-pass Separator will be provided as the second level of treatment for
surface water runoff from car park areas. In this instance, the entirety of
the collected surface water from the car park areas will pass through, and
be treated by the separator. A Klargester NSBP006 or equivalent is
specified.
• Landscaping / Green Areas. All paved areas that are considered
impermeable are to drain laterally to the landscaped and green areas where
possible, which will reduce the overall quantity of surface water runoff from
the site.
Details of the proposed SuDS systems can be found in Appendix D to the rear of
this report.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
11 Project No. C912 Issued: 04/2020
4 WATER SUPPLY
4.1 Existing Watermain Layout
All proposed potable water design has been carried out in accordance with Irish
Water’s Code of Practice for Water Infrastructure.
As noted earlier in section 2.2 a Pre-Connection Enquiry Form was submitted to
Irish Water and a Confirmation of Feasibility Letter was received. Irish Water have
confirmed via the Confirmation of Feasibility Letter that a connection to the public
water network can be facilitated subject to a valid connection agreement. Refer to
Appendix A for details.
In addition to the Pre-connection Enquiry to Irish Water, local Cork County Council
representatives were also contacted to establish the water infrastructure serving
the site. An existing Watermain serves the existing Avoncore estate and passes
the northern boundary of the proposed site. Refer to Figure 4 overleaf.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
12 Project No. C912 Issued: 04/2020
Figure 4: Existing Water Network.
4.2 Proposed Watermain Layout
It is proposed to take a connection from the existing watermain and provide a
100mm diameter HDPE ring water main to the perimeter of the proposed
dwellings. A water meter will be provided where the watermain enters the
development and individual properties will be fitted with an approved meter box
located as required for water metering purposes in accordance with Irish Water
requirements.
One Fire hydrant will be provided within the site and will be in accordance with
Technical Guidance Document B of the Building Regulations.
The proposed watermain layout is shown on C912-OCSC-XX-XX-DR-C-0021.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
13 Project No. C912 Issued: 04/2020
The above proposal is subject to a valid connection agreement with Irish Water,
however both Irish Water and local representatives of Water Services division of
Cork County Council have confirmed the water network has sufficient capacity to
cater for the proposed development. Refer to Appendix E for details.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
14 Project No. C912 Issued: 04/2020
5 ROAD NETWORK
5.1 Site Access
The site is accessed via the L-7707, serving the existing Avoncore estate. It is
proposed to provide a new entrance and access road from the L-7707 to serve the
proposed development.
The existing site falls from the north to south with an overall level difference of
approximately 3m. It is proposed to mimic the existing ground levels as much as
possible to minimise the quantity of cut/fill required across the site.
5.2 Internal Arrangements
A 5.0m wide road with a 1.8m wide footpath is proposed for the internal road
layout. The internal road layout and levels are detailed on drawings C912-OCSC-
XX-XX-DR-C-0001, with road sections detailed on C912-OCSC-XX-XX-DR-C-0002
and C912-OCSC-XX-XX-DR-C-0003.
O’Connor Sutton Cronin & Associates Engineering Services Report
Multidisciplinary Consulting Engineers Avoncore Housing Development, Midleton, Co. Cork
15 Project No. C912 Issued: 04/2020
6 FLOODING
An investigation was undertaken to determine the susceptibility of the site to
flooding as part of the scheme design.
From examination of the Office of Public Works (OPW) Fluvial & Tidal flood maps
it was established that the proposed development is not within a Fluvial or Tidal
flood risk zone. The Fluvial & Tidal flood maps for the proposed site is included in
Appendix F.
IAN O’MAHONY (BEng, CEng, MIEI)
OCSC MULTIDISCIPLINARY CONSULTING ENGINEERS
IRISH WATER FEASIBLITY LETTER
Cork County Council, C/o Ian O'Mahony, O’Connor Sutton Cronin, North Point House, North Point Business Park, New Mallow Road, Cork T23AT2P
8 April 2020
Dear Ian,
Re: Connection Reference No CDS19008835 pre-connection enquiry -
Subject to contract | Contract denied
Connection for Housing Development of 16 unit(s) at Avoncore Place, Midleton, Co. Cork.
Irish Water has reviewed your pre-connection enquiry in relation to a water and wastewater connection at Avoncore Place, Midleton, Co. Cork. Regarding a water connection, we wish to advise you that, subject to a valid connection agreement being put in place, your proposed connection to the Irish Water network can be facilitated. Regarding a wastewater connection, we wish to advise you that there is currently insufficient capacity in the Midleton wastewater treatment plant (WWTP). However, as noted below the proposed connection to the Irish Water network will be facilitated at a future date Irish Water is currently progressing projects to provide additional wastewater treatment capacity in
Midleton. It is currently estimated that some capacity would be available in 2023 (subject to change) –
however in order to avail of this, a network extension may be required to connect to a point in the
network approximately 1km to the west of the site. This extension may require a pumping station,
subject to confirmation of levels.
Otherwise, capacity would be available on completion of a parallel project circa 2026.
All infrastructure should be designed and installed in accordance with the Irish Water Codes of Practice
and Standard Details. A design proposal for the water and/or wastewater infrastructure should be
submitted to Irish Water for assessment.
You are advised that this correspondence does not constitute an offer in whole or in part to provide a
connection to any Irish Water infrastructure and is provided subject to a connection agreement being
signed at a later date.
A connection agreement can be applied for by completing the connection application form available at
www.water.ie/connections. Irish Water’s current charges for water and wastewater connections are
set out in the Water Charges Plan as approved by the Commission for Regulation of Utilities.
If you have any further questions, please contact Michael Galvin from the design team on 52294 or
email [email protected]. For further information, visit www.water.ie/connections.
Yours sincerely,
Maria O’Dwyer
Connections and Developer Services
FOUL WATER DESIGN CALCULATIONS
JOB NAME: JOB NO: DATE:
Avoncore Housing Development, Midleton, Co. Cork C912 03/12/20 Pipe Ks: 1.5
DU /
TITLE: CALCS BY: CHECK'D: House: 14
FOUL SEWER CAPACITY CALCS IOM JMcB
Pop.DWF (l/s)
(200 l/h/d)
Design
Flow
(6xDWF)
PopDWF (l/s)
(30 l/h/d)
Design
Flow
(6xDWF)
Total
DWF (l/s)
Pipe
Diameter
(mm)
U/S IL (m)D/S IL
(m)
Length
(m)
Slope
(1:X)
Pipe
Capacity
(l/s) Ad
eq
uate
Cap
acit
y?
Prop.
Velocity
(m/s)
Self
Cle
an
sin
g?
F1 to F2 5 0.01 0.07 0 0.00 0.00 0.07 150 10.49 10.37 12.0 100 15.47 � 0.18 �
F2 to F3 60 0.14 0.83 0 0.00 0.00 0.83 150 10.37 9.82 82.5 150 12.61 � 0.38 �
F3 to F4 65 0.15 0.90 0 0.00 0.00 0.90 150 9.82 9.30 78.0 150 12.61 � 0.41 �
Note:
Pipe Section
COMMERCIALRESIDENTIAL
Self cleansing is considered to be satisfied by a 150mm diameter sewer having a gradient not flatter than
1 in 150 and a flow rate greater than 0.46 l / s (equivalent of 10 dwellings). Where the sewer is 100mm in
diamter the minium acceptable gradient is 1 in 80 where at least 1 WC is connected
O'CONNOR SUTTON CRONINNORTH POINT HOUSENORTH POINT BUSINESS PARKNEW MALLOW ROADCORK.
Tel: 021 2355816
STORM WATER CALCULATIONS
Project: C871
Project No.: Avoncore Housing, Midleton
Calculation: Attenuation 100-year
Calcs By: IOM
Checked By: JMcB
Date: 17/12/2019
Site Location:
Design Storm Return Period: 100 years
Climate Change Factor: 10 %
Soil Type: 4
Total Site Area: 0.51 ha
Hardstand Area: 0.37 ha 2222.@ 100% Impervious
Softstand Area: 0.14 ha 2222.@ 0% Impervious
Effective Impermeable Area: 0.37 ha
Allowable Outflow
IH124: QBAR = 0.00108 x AREA0.89
x SAAR1.17
x SOIL2.17
AREA: 0.01 km2
SAAR: 1133 mm
SOIL: 0.47
QBAR/ha 8.48 l/s/ha
Allowable Outflow 4.3 l/s
Storage required = 189 m3
DurationRainfall
100-Year
Rainfall 100-
Year with CCFIntensity
Discharge
(Q = 2.71iA)
Proposed
Runoff
Contiguous
Land Runoff
Total
Runoff
Allowable
Outflow
Storage
Required
(min) (mm) (mm) (mm/hr) (l/s) (m3) (m
3) (m
3) (m
3) (m
3)
2 0.0 0.0 0.0 0 0 0 0 1 -1
5 16.3 17.9 215.2 217 65 0 65 1 64
10 22.7 25.0 149.8 151 91 0 91 3 88
15 26.8 29.5 117.9 119 107 0 107 4 103
30 33.1 36.4 72.8 73 132 0 132 8 124
60 40.9 45.0 45.0 45 163 0 163 16 148
120 50.6 55.7 27.8 28 202 0 202 31 171
180 57.2 62.9 21.0 21 228 0 228 47 181
240 62.5 68.8 17.2 17 250 0 250 63 187
360 70.8 77.9 13.0 13 283 0 283 94 189
540 80.1 88.1 9.8 10 320 0 320 141 179
720 87.5 96.3 8.0 8 349 0 349 188 162
1080 99.1 109.0 6.1 6 396 0 396 282 114
1440 108.2 119.0 5.0 5 432 0 432 376 56
2880 124.2 136.6 2.8 3 496 0 496 751 -255
4320 137.7 151.5 2.1 2 550 0 550 1127 -577
5760 149.6 164.6 1.7 2 597 0 597 1502 -905
8640 170.4 187.4 1.3 1 680 0 680 2253 -1573
11520 188.7 207.6 1.1 1 753 0 753 3004 -2251
14400 205.4 225.9 0.9 1 820 0 820 3755 -2935
17280 221.0 243.1 0.8 1 882 0 882 4506 -3624
23040 249.6 274.6 0.7 1 996 0 996 6008 -5012
28800 275.9 303.5 0.6 1 1101 0 1101 7511 -6409
36000 306.4 337.0 0.6 1 1223 0 1223 9388 -8165
Midleton
Calculate
Project: C871
Project No.: Avoncore Housing, Midleton
Calculation: Attenuation 100-year
Calcs By: IOM
Checked By: JMcB
Date: 17/12/2019
-50
0
50
100
150
200
250
300
350
400
450
500
0 200 400 600 800 1000 1200 1400 1600
Vo
lum
e (
m3)
Storm Duration (mins)
Total Runoff Allowable Outflow Storage Required
Met Eireann Return Period Rainfall Depths for sliding Durations Irish Grid: Easting: 187755, Northing: 74660,
Interval | YearsDURATION 6months, 1year, | 2, 3, 4, 5, 10, 20, 30, 50, 75, 100, 150, 200, 250, 500, 5 mins 3.1, 4.3, | 4.9, 5.9, 6.6, 7.1, 8.7, 10.6, 11.9, 13.6, 15.1, 16.3, 18.2, 19.6, 20.8, N/A , 10 mins 4.3, 6.0, | 6.9, 8.2, 9.1, 9.9, 12.2, 14.8, 16.5, 18.9, 21.1, 22.7, 25.3, 27.3, 28.9, N/A , 15 mins 5.0, 7.0, | 8.1, 9.7, 10.8, 11.6, 14.3, 17.4, 19.4, 22.3, 24.8, 26.8, 29.8, 32.1, 34.0, N/A , 30 mins 6.6, 9.1, | 10.5, 12.5, 13.8, 14.8, 18.2, 21.9, 24.3, 27.7, 30.8, 33.1, 36.6, 39.4, 41.7, N/A , 1 hours 8.8, 11.9, | 13.6, 16.0, 17.7, 18.9, 23.0, 27.5, 30.5, 34.6, 38.1, 40.9, 45.1, 48.4, 51.0, N/A , 2 hours 11.6, 15.6, | 17.6, 20.7, 22.7, 24.2, 29.2, 34.6, 38.2, 43.0, 47.3, 50.6, 55.5, 59.3, 62.5, N/A , 3 hours 13.6, 18.2, | 20.5, 24.0, 26.2, 28.0, 33.5, 39.6, 43.5, 48.9, 53.6, 57.2, 62.7, 66.9, 70.3, N/A , 4 hours 15.3, 20.3, | 22.9, 26.6, 29.1, 31.0, 37.0, 43.6, 47.8, 53.6, 58.7, 62.5, 68.4, 72.8, 76.5, N/A , 6 hours 18.0, 23.7, | 26.6, 30.8, 33.6, 35.7, 42.5, 49.8, 54.5, 60.9, 66.5, 70.8, 77.2, 82.1, 86.1, N/A , 9 hours 21.2, 27.7, | 31.0, 35.8, 38.9, 41.3, 48.8, 57.0, 62.2, 69.3, 75.4, 80.1, 87.2, 92.6, 97.0, N/A ,12 hours 23.8, 30.9, | 34.5, 39.7, 43.1, 45.7, 53.8, 62.6, 68.2, 75.9, 82.5, 87.5, 95.1, 100.8, 105.5, N/A ,18 hours 28.0, 36.1, | 40.2, 46.0, 49.9, 52.7, 61.9, 71.6, 77.8, 86.3, 93.6, 99.1, 107.3, 113.6, 118.7, N/A ,24 hours 31.5, 40.3, | 44.8, 51.1, 55.3, 58.4, 68.3, 78.8, 85.5, 94.5, 102.3, 108.2, 117.0, 123.7, 129.2, 147.6, 2 days 40.4, 50.6, | 55.6, 62.8, 67.4, 70.9, 81.7, 93.1, 100.2, 109.9, 118.1, 124.2, 133.5, 140.4, 146.0, 164.9, 3 days 47.7, 59.0, | 64.5, 72.4, 77.4, 81.1, 92.7, 104.9, 112.5, 122.6, 131.2, 137.7, 147.3, 154.5, 160.3, 179.8, 4 days 54.2, 66.5, | 72.4, 80.8, 86.1, 90.1, 102.4, 115.3, 123.2, 133.8, 142.8, 149.6, 159.5, 167.0, 173.0, 193.0, 6 days 65.9, 79.7, | 86.4, 95.7, 101.6, 106.1, 119.5, 133.5, 142.1, 153.6, 163.2, 170.4, 181.0, 188.9, 195.2, 216.4, 8 days 76.4, 91.6, | 98.9, 109.0, 115.4, 120.2, 134.7, 149.6, 158.8, 170.9, 181.1, 188.7, 199.9, 208.2, 214.8, 236.9, 10 days 86.2, 102.6, | 110.4, 121.3, 128.1, 133.2, 148.6, 164.4, 174.0, 186.8, 197.5, 205.4, 217.1, 225.7, 232.7, 255.6, 12 days 95.5, 112.9, | 121.3, 132.8, 140.0, 145.3, 161.6, 178.1, 188.2, 201.6, 212.7, 221.0, 233.1, 242.1, 249.3, 272.9, 16 days 112.9, 132.3, | 141.5, 154.2, 162.1, 168.0, 185.6, 203.6, 214.5, 228.8, 240.8, 249.6, 262.5, 272.1, 279.7, 304.8, 20 days 129.3, 150.5, | 160.4, 174.1, 182.6, 188.9, 207.9, 227.1, 238.7, 253.9, 266.5, 275.9, 289.5, 299.5, 307.6, 333.8, 25 days 148.7, 171.9, | 182.8, 197.6, 206.8, 213.6, 234.0, 254.5, 266.9, 283.1, 296.5, 306.4, 320.8, 331.4, 339.8, 367.5,NOTES:N/A Data not availableThese values are derived from a Depth Duration Frequency (DDF) ModelFor details refer to:’Fitzgerald D. L. (2007), Estimates of Point Rainfall Frequencies, Technical Note No. 61, Met Eireann, Dublin’, Available for download at www.met.ie/climate/dataproducts/Estimation-of-Point-Rainfall-Frequencies_TN61.pdf
SUSTAINABLE URBAN DRAINAGE SYSTEMS
4
UNIT FLOW PEAK FLOW DRAINAGE STORAGE UNIT UNIT DIA. ACCESS BASE TO BASE TO STANDARD MIN. INLET STANDARD NOMINAL (l/s) RATE (l/s) AREA (m2) CAPACITY (litres) LENGTH (mm) (mm) SHAFT INLET INVERT OUTLET FALL ACROSS INVERT PIPEWORK SIZE SILT OIL DIA. (mm) (mm) INVERT (mm) (mm) DIA.
NSBP003 3 30 1670 300 45 1700 1350 600 1420 1320 100 500 160
NSBP004 4.5 45 2500 450 60 1700 1350 600 1420 1320 100 500 160
NSBP006 6 60 3335 600 90 1700 1350 600 1420 1320 100 500 160
NSBE010 10 100 5560 1000 150 2069 1220 750 1450 1350 100 700 315
NSBE015 15 150 8335 1500 225 2947 1220 750 1450 1350 100 700 315
NSBE020 20 200 11111 2000 300 3893 1220 750 1450 1350 100 700 375
NSBE025 25 250 13890 2500 375 3575 1420 750 1680 1580 100 700 375
NSBE030 30 300 16670 3000 450 4265 1420 750 1680 1580 100 700 450
NSBE040 40 400 22222 4000 600 3230 1920 600 2185 2035 150 1000 500
NSBE050 50 500 27778 5000 750 3960 1920 600 2185 2035 150 1000 600
NSBE075 75 750 41667 7500 1125 5841 1920 600 2235 2035 200 950 675
NSBE100 100 1000 55556 10000 1500 7661 1920 600 2235 2035 200 950 750
NSBE125 125 1250 69444 12500 1875 9548 1920 600 2235 2035 200 950 750
Rotomoulded chamber construction GRP chamber construction * Some units have more than one access shaft – diameter of largest shown.
Advanced
rotomoulded construction
on selected models
• Compact and robust
• Require less backfill
• Tough, lightweight and
easy to handle
truction
models
d robust
ss backfil
ough, lightweigeig
easy to handle
APPLICATION
Bypass separators are used when it is considered an acceptable risk
not to provide full treatment, for very high flows, and are used, for
example, where the risk of a large spillage and heavy rainfall occurring
at the same time is small, e.g.
Surface car parks.
Roadways.
Lightly contaminated commercial areas.
PERFORMANCE
Klargester were one of the first UK manufacturers to have separators
tested to EN 858-1. Klargester have now added the NSB bypass
range to their portfolio of certified and tested models. The NSB number
denotes the maximum flow at which the separator treats liquids.
The British Standards Institute (BSI) tested the required range of
Kingspan Klargester Bypass separators and certified their performance
in relation to their flow and process performance assessing the effluent
qualities to the requirements of EN 858-1. Klargester bypass separator
designs follow the parameters determined during the testing of the
required range of bypass separators.
Each bypass separator design includes the necessary volume
requirements for:
Oil separation capacity. Oil storage volume.
Silt storage capacity. Coalescer.
The unit is designed to treat 10% of peak flow. The calculated
drainage areas served by each separator are indicated according to
the formula given by PPG3 NSB = 0.0018A(m2). Flows generated by
higher rainfall rates will pass through part of the separator and bypass
the main separation chamber.
Class I separators are designed to achieve a concentration of 5mg/litre
of oil under standard test conditions.
Bypass NSB RANGE
SIZES AND SPECIFICATIONS
FEATURES
Light and easy to install.
Inclusive of silt storage volume.
Fitted inlet/outlet connectors.
Vent points within necks.
Oil alarm system available (required by EN 858-1 and PPG3).
Extension access shafts for deep inverts.
Maintenance from ground level.
GRP or rotomoulded construction (subject to model).
To specify a nominal size bypass separator, the following information
is needed:-
The calculated flow rate for the drainage area served. Our designs
are based on the assumption that any interconnecting pipework
fitted elsewhere on site does not impede flow into or out of the
separator and that the flow is not pumped.
The drain invert inlet depth.
Pipework type, size and orientation.
WATER NETWORK CAPACITY
FLOOD MAPS
1
Ian O'Mahony
From: Connie Keller <[email protected]>
Sent: 11 November 2019 17:46
To: Ian O'Mahony
Cc: Donal O'Keeffe; Richard Fenton; John McBeath
Subject: RE: Avoncore_Middleton_Drinking Water Capacity
Hi Ian,
Apologies for the late reply.
There is ample capacity for the additional 8 units in Avoncore, Midleton.
Kind Regards,
Connie Keller BE MIEI
Assistant Engineer, Cork County Council
+353 (0) 85 870 5837 |
Glashaboy Waterworks, Richmond, Glanmire, Co. Cork, T45 P406
IMPORTANT: The contents of this email and any attachments are confidential. They are intended for the named recipient(s)
only. If you have received this email by mistake, please notify the sender immediately and do not disclose the contents to
anyone or make copies thereof.
From: Ian O'Mahony [mailto:[email protected]]
Sent: Wednesday 23 October 2019 17:02
To: Connie Keller <[email protected]>
Cc: Donal O'Keeffe <[email protected]>; Richard Fenton <[email protected]>; John McBeath
Subject: RE: Avoncore_Middleton_Drinking Water Capacity
Hi Connie,
I am an Engineer with OCSC working on behalf Cork County Council’s Architect’s Department on the proposed
Housing Development at Avoncore, Midleton, the email thread below refers.
This scheme has increased in size from the original 8units as per below to 16units and we are looking to see if this
has an effect on the possibility of connecting to water network. Can you confirm if there is adequate capacity in the
network to cater for the additional 8 units? We will be submitting the relevant application to Irish Water but just
wanted to check informally first.
Please feel free to give me a call if you would like to discuss.
Regards
Ian O’Mahony
Senior Engineer
DD: +353 21 2355 816
2
Please consider the environment before printing this email.
From: Connie Keller <[email protected]>
Sent: 12 February 2019 13:15
To: Richard Fenton <[email protected]>
Cc: Donal O'Keeffe <[email protected]>
Subject: RE: Avoncore_Middleton_Drinking Water Capacity
Hi Richard,
I have looked into your proposed site location.
Please find a watermain drawing for the general area attached.
Site has an existing watermain adjacent to the North of the Site.
It appears to be a 100mm Cast Iron watermain.
The water will be supplied from Midleton Water Treatment Plant.
There is adequate capacity for the 8 units.
Regards,
Connie Keller BE MIEI
Assistant Engineer, Cork County Council
+353 (0) 85 870 5837 |
Glashaboy Waterworks, Richmond, Glanmire, Co. Cork, T45 P406
IMPORTANT: The contents of this email and any attachments are confidential. They are intended for the named recipient(s)
only. If you have received this email by mistake, please notify the sender immediately and do not disclose the contents to
anyone or make copies thereof.
From: Richard Fenton
Sent: 12 February 2019 09:26 To: Connie Keller
Subject: Avoncore_Middleton_Drinking Water Capacity
Hi Connie,
We are investigating a site for development in Avoncore Midleton as per the attached site layout.
WATER NETWORK CAPACITY
FLOOD MAPS
LOCATION OF PROPOSED SITE. THE SITE IS NOT WITHIN A FLUVIALFLOOD ZONE.
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3OWE_2281
3OWE_2160
3OWE_1971
3OWE_1714
3OWE_1527
3OWE_1315
3DUN_265
3DUN_150
3DUN_0
026
±© Government of IrelandOSi permit number EN-002-1006
Location Plan :
Office of Public Works17-19 Lower Hatch StreetDublin 2Ireland
www.halcrow.com
Halcrow Group Ireland3A Eastgate RoadEastgateLittle IslandCorkIreland
USER NOTE :
USERS OF THESE MAPS SHOULD REFER TO THE DETAILEDDESCRIPTION OF THEIR DERIVATION, LIMITATIONS INACCURACY AND GUIDANCE AND CONDITIONS OF USEPROVIDED AT THE FRONT OF THIS BOUND VOLUME. IF THISMAP DOES NOT FORM PART OF A BOUND VOLUME, ITSHOULD NOT BE USED FOR ANY PURPOSE.
1:5,000
Figure By :
Checked By :
Approved By :
Date :
Date :
Date :
Revision
Plot Scale : 1:1 @ A3Drawing Scale :
Figure No. :
Valeria Medina
Project :
M9/UA/EXT/CURS/016
LEE CATCHMENT FLOOD RISKASSESSMENT AND MANAGEMENT STUDYMap :
MIDLETON
TIDAL FLOODINGMap Type :
Source :
Map area :
FLOOD EXTENT
URBAN AREACURRENTScenario :
This map shows tidal flooding. To see fluvial flood maps ofthis area please look at Figure No: M3/UA/EXT/CURS/002
EXTENT MAP
River Centreline
0.1 % AEP Flood Extent
10 % AEP Flood Extent
0.5 % AEP Flood Extent
Legend:
Low Confidence (> 40m) (10% and 0.1% AEP)
High Confidence (<20m) (10% AEP)
Medium Confidence (<40m) (10% AEP)
Low Confidence (>40m) (0.5% AEP)
High Confidence (<20m) (0.5% AEP)
Medium Confidence (<40m) (0.5% AEP)
(1 in 10 chance in any given year)
(1 in 200 chance in any given year)
(1 in 1000 chance in any given year)
Defended area
Node Point
Node Label (refer to table)001
0.1 0 0.1 0.2 0.3 0.40.05
Kilometres
Tidally influenced flooding does not extend upstream of this point. Please refer to the fluvial flood maps.
Node Label WL 10% WL 0.5% WL 0.1%
3OWE_2281 2.63 2.95 3.14
3OWE_2160 2.59 2.91 3.09
3OWE_1971 2.57 2.90 3.08
3OWE_1714 2.56 2.89 3.06
3OWE_1527 2.56 2.88 3.06
3OWE_1315 2.54 2.85 3.01
3DUN_265 2.68 3.06 3.22
3DUN_150 2.68 3.07 3.22
3DUN_0 2.59 2.93 3.11
Water Level (mOD) per AEP
Paul Dunne
1
Clare Dewar 21 June 2012
21 June 2012
21 June 2012
SITE IS LOCATED APPROX 1kmUPSTREAM OF THE EXTENT OF THISMAP, THEREFORE THE SITE IS NOTWITHIN A TIDAL FLOOD ZONE.