HomeMy WebLinkAbout2660408 - Other Assessments - Engineering Services Report
Directors: Emmet Finegan B.Sc.(Eng), DipStructEng, C.Eng, M.I.Struct.E, M.I.E.I., FConsEI, P.Grad.Dip CACL Doherty Finegan Kelly Ltd., Reg No. 376523
Cathal Kelly B.Sc.(Eng), DipStructEng, C.Eng, M.I.Struct.E, M.I.E.I., FConsEI, Dip Proj Man
Robert Bagnall B.Sc.Building Surveying, MSCSI, MRICS.
Regional Directors: Liam Murphy B.S.c.(Eng), Dip Eng, C.Eng, M.I.Struct.E, M.I.E.I.
Engineering Services Report - Submission for Planning
Proposed development
at
Inniskeen Grattans Cummann Luthchleas Gael,
Kednainsha,
Inniskeen,
Co. Monaghan.
Report DFK/26144
Project No. 26144 Document Ref:
Engineering Services
Report 26144.doc
Revision Purpose /
Description
Originated Checked Authorised Date
00 Planning EF EF EF 02.09.2026
Doherty Finegan Kelly, Civil & Structural Engineers,
Botanic Court, 30-32 Botanic Road, Glasnevin, Dublin 9
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1.0 Introduction
Existing Situation
Proposed Development
2.0 Access Roads and Car park
General
3.0 Water Supply
Potable Water
4.0 Surface Water
Proposed Development
5.0 Foul Water
Proposed Development
Appendix I Surface Water & SuDS Calculations
TABLE OF CONTENTS
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The existing site, known as Inniskeen Grattans Cummann Luthchleas Gael, is a well-
established GAA Club in Inniskeen, Co. Monaghan with pitch, parking and spectators
stand.
The proposed development consists of the construction of a new 2-storey club house, an
extension to the existing seated stand and all associated site works.
Access to the unit will be provided via existing road linking to the existing internal road
layout. No new access is required to the public road.
The development is adequately served car parking spaces. No new parking is proposed
with 2 dedicated Part M spaces at the main entrance.
This report will address the proposed infrastructural requirements for the development.
It is proposed that the surface water from the proposed site will be dealt with onsite using
filter drains before discharging via a flow control devise to the onsite drainage network.
It is proposed that the foul water discharge from the site will drain by gravity and tie in
with existing onsite wastewater treatment unit and percolation area. No application to
Irish Water is required.
All work will be carried out to the satisfaction of FCC and will adhere to the requirements
of the “Greater Dublin Regional Code of Practice for Drainage Works” (GDRC) and
“Recommendations for Site Development Works for Housing Areas”. The design
principles adopted will be those of best engineering practice and standards used will be
from the most recent applicable publications. In particular, reference is made to the
“Greater Dublin Strategic Drainage Study Volume 2 New Developments” (GDSDS).
This report should be read in conjunction with the following drawings; which are
enclosed with this submission:
DRAWING
NUMBER
DESCRIPTION
26144-1000A Site Location Map
26144-001 Existin Site La out
26144-002 Proposed Site La out
26144-003 Site Draina e La out sheet 1
26144-004 Site Draina e La out sheet 2
26144-010 Terrace Stand Existin Plans, Section & Elevations
26144-011 Terrace Stand Proposed Plans, Section & Elevations
26144-012 Club House Proposed Plans
26144-013 Proposed Elevations
26144-014 Conti uous Elevations
Table 1 - Drawing Schedule
1.0 INTRODUCTION REC
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The proposed development is a new building located within the GAA Complex.
No new internal roads are required. No new entrance to the public road is required.
2.0 ACCESS ROADS AND CARPARKS
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The development will be served from the existing on site potable water supply with a
supply taken directly from the stand to the south of the site.
There is an Irish Water water supply on site with connections off the main road.
3.0 WATER SUPPLY
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The surface water network will be designed and arranged in accordance with the
requirements of the GDSDS and the GDRC in conjunction with “Recommendations for
Site Development Works for Housing Areas” (current edition) published by the
(DOEHLG). Cognisance has also been taken of the recommendations contained within
the Building Regulations Part H – Drainage and Waste Water Disposal.
The SUDs mechanisms outlined within this report have been designed for a 1 in 100 year
return period storm, as required by GDSDS “Regional Drainage Policies Vol 2 New
Development”. Collectively the SuDS mechanisms have been designed to ensure that no
flooding will occur within the site up to the 30 year return period storm, as well as being
able to deal with events up to a 1 in 100 year return period storm. The surface water
network will be laid as a separate system and drains will be laid such as to minimise the
risk of misconnections.
The surface water run-off from the roof areas and the car park will be collected by the
proposed drainage network and diverted to a new filter drain to the north before
connecting to the site drainage.
4.0 SURFACE WATER
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The foul water network will be designed and arranged in accordance with the
requirements of the GDSDS and the GDRC in conjunction with “Recommendations for
Site Development Works for Housing Areas” (current edition) published by the
(DOEHLG). Cognisance has also been taken of the recommendations contained within
the Building Regulations Part H – Drainage and Waste Water Disposal. The Guidelines
published by Irish Water will also be followed, although an Irish Water connection is not
required. The foul water network will be laid as a separate system and drains will be laid
such as to minimise the risk of misconnections.
It is proposed that the foul water discharge from the site will drain by gravity to the
existing onsite foul network before connecting to the existing on site wastewater treatment
system. A report on this system and percolation area confirms there is sufficient capacity
within the existing wastewater treatment unit facility for the proposed development.
The existing foul sewer layout is shown on DFK Drg. No. 26144-003
5.0 FOUL WATE
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APPENDIX I
SURFACE WATER + SUD’S CALCULATIONS
Return Period Rainfall Depths Table
Site Catchment Characteristics
Attenuation 30 year
Attenuation 100 year
Attenuation Design Criteria - Stage 1-4
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Doherty Finegan Kelly Botanic Court, 30 Botanic Road, Glasnevin,
Consulting Structural & Civil Engineers,Dublin 9
Tel: 8301852 / Fax: 8602265
Reference:Output:
** The area taken in calculating QBAR/ha is 50 ha in accordance with paragraph 6.6.1 of Vol 2 of the GDSDS.
0.5 1 2 5 10 20 30 50 100
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
3.2 4.6 5.3 7.6 9.2 11.3 12.5 14.3 17.2
4.3 6.0 6.8 9.6 11.8 14.2 15.7 17.9 21.2
5.0 7.0 7.9 11.0 13.4 16.2 17.9 20.3 24.0
6.7 9.1 10.3 14.2 17.0 20.3 22.4 25.3 29.8
8.9 11.9 13.3 18.1 21.6 25.6 28.1 31.4 36.7
11.8 15.5 17.3 23.2 27.5 32.2 35.0 39.2 45.5
15.5 20.2 22.4 29.6 34.8 40.4 43.9 48.8 56.2
18.2 23.5 26.2 34.2 40.0 46.2 50.2 55.4 63.6
24.1 30.7 33.8 43.7 50.6 58.1 62.8 69.1 78.6
31.9 40.0 43.9 55.8 64.2 73.1 78.6 86.0 97.2
39.6 48.8 53.2 66.4 75.6 85.2 91.2 99.1 111.0
46.1 56.3 61.1 75.5 85.4 95.8 102.1 110.6 123.1
Allowance of 20% for Climate Change in accordance with GDSDS
0 m²TOTAL 0 m²
Area (m2)Runoff coefficient
845.0 mm
Hardstanding
500 m²
Design:
Minutes:
Roof Area
Other Record:
QBAR
Inniskeen Grattan Cumman Luthchleas Gale
Prepared:
0.114 m³/sec
Telephone Log:
Site Catchment Characteristics
26144 SG
Checked:
Site Catchment Characteristics - Club House
Project:
SG
Total Area
Element:
SAAR
AREA **0.50 km²
SOIL
Permeable Paving
Project No:
100 years
0.3
Contrbuting Area
Total Total
Areas Contributing to Infiltration into:
Area
6 hr
60 min
Allowable Outflow (l/s)
0.85
1 years
2 hr
15.1 mmRP5 60min=
Multiplier
72 hr
12 hr
10 min
15 min
2 min
48 hr
30 min
24 hr
4 hr
5 min
845.0 mm55.3 mm
1
Total
Total Total
0.19
DURATION
Growth Curve
Location
RP5 2d=ANNUAL RAINFALL=
0.10 0.30
Allowable Outflow
0.11
30 yearsQBAR10 years
2.1 2.61.7
0.24
Areas Contributing to Drainage Network:
Area Location
2.271
500 m²
TOTAL
QBAR/ha (l/s/ha)
Landscape
Location
AreaLocation
0 m²0 m²0 m²
Location Area Location Area
0 m²0 m²
RETURN PERIOD ( YEARS )
Extreme Rainfall Matrix
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Doherty Finegan Kelly Botanic Court, 30 Botanic Road, Glasnevin,
Consulting Structural & Civil Engineers,Dublin 9
Tel: 8301852 / Fax: 8602265
Reference:Output:
RP5 2d=
0.5 1 2 5 10 20 30 50 100
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
38.9 54.7 63.4 90.7 110.9 135.4 149.8 171.4 205.9
25.9 36.0 41.0 57.6 70.6 85.0 94.3 107.3 127.4
20.2 27.8 31.7 44.2 53.8 64.8 71.5 81.1 96.0
13.4 18.2 20.6 28.3 34.1 40.6 44.9 50.6 59.5
8.9 11.9 13.3 18.1 21.6 25.6 28.1 31.4 36.7
5.9 7.7 8.6 11.6 13.7 16.1 17.5 19.6 22.7
3.9 5.0 5.6 7.4 8.7 10.1 11.0 12.2 14.0
3.0 3.9 4.4 5.7 6.7 7.7 8.4 9.2 10.6
2.0 2.6 2.8 3.6 4.2 4.8 5.2 5.8 6.6
1.3 1.7 1.8 2.3 2.7 3.0 3.3 3.6 4.1
0.8 1.0 1.1 1.4 1.6 1.8 1.9 2.1 2.3
0.6 0.8 0.8 1.0 1.2 1.3 1.4 1.5 1.7
Rainfall intensity shown as mm/hr.
DURATION
2880
4320
720
1440
360
30
2
5
10
ANNUAL RAINFALL=
RETURN PERIOD ( YEARS )
120
240
15
60
RP5 60min=15.1 mm
Design:
Minutes:
Prepared:
26144
Element:
Infiltration Trench - Club House
Inniskeen Grattan Cumman Luthchleas Gale
Project:Telephone Log:
Other Record:
Extreme Rainfall Matrix
SG
Checked:
SG
Project No:
845.0 mm55.3 mm
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Doherty Finegan Kelly Botanic Court, 30 Botanic Road, Glasnevin,
Consulting Structural & Civil Engineers,Dublin 9
Tel: 8301852 / Fax: 8602265
Reference:Output:
From CIRIA Report No. 156(1996) - Infiltration Drainage Manual of Good Practice
where:
Area to be Drained
and a is given by:
Soakaway dimensions
The time taken to half-empty the system is given by:
* QOVERFLOW is the averaged flow for the duration given.
hPROVIDED
5.182 -137.552
Vertical Sided System - Time to Empty
Event
1 in 10 years 89.751 hrs
Base Area (Ab)
1 in 100 years 95.852 hrs
30 Years 360.000 min 15.000 m²0.850 m
Width 1.000 m
Infiltration System -- Overflow from Soakaway
1 in 50 years 94.258 hrs
10 Years 360.000 min 15.000 m²0.850 m 3.249 m 0.036 l/sec
hmax
Time to Empty
360.000 min 4.515 -119.844 360.000 min
Return Period Duration
1 in 30 years 92.989 hrs
QOVERFLOW*
-158.516 240.000 min
-255.000 120.000 min120.000 min 3.243
240.000 min 4.006 4.609 -182.344
3.760 -295.625
2.475 -774.531
3.047 -477.65660.000 min 2.609 -408.906 60.000 min
30.000 min 2.105 -658.906 30.000 min
hmax a
15.000 min 1.688 -1055.781 15.000 min 1.998 -1249.531
Duration (D)hmax a Duration (D)
4.083 -108.385
50 Year Return Period 100 Year Return Period
360.000 min 3.249 -86.250 360.000 min
-112.813 240.000 min
-178.438 120.000 min120.000 min 2.269
240.000 min 2.851
2.330 -365.156
3.602 -142.500
2.895 -227.656
15.000 min 1.118
-280.781 60.000 min
30.000 min 1.416 -443.281 30.000 min
60.000 min 1.791
1.866 -583.906
a Duration (D)hmax a
1.488 -930.781-699.531 15.000 min
0.006
Length 15.000 m
Base Area (Ab)15.000 m²
Duration (D)hmax
10 Year Return Period 30 Year Return Period
Assume - Aquacells (n)0.40
Hmax Calculation
Perimeter (P)32.000 m
AD 500.000 m²
Ab/P=0.469
b=
q
3.600 mm/hr
FOS Minor Inconvenience 3.00
0.001 m/hr
Description Type Result Equations Applied to Determine hmax
SG
Infiltration Rate Soil
Inniskeen Grattan Cumman Luthchleas Gale Minutes:Other Record:
Project:Design:Telephone Log:
Project No:Element:Prepared:
4.083 m 0.063 l/sec
Infiltration Trench - Club House SG
Vertical Sided System
100 Years 360.000 min 15.000 m²0.850 m 5.182 m 0.110 l/sec
Checked:
26144
4.515 m 0.080 l/sec50 Years 360.000 min 15.000 m²0.850 m
(1) )1()(
max −=−bDeah
(3) Pq
iA
P
Aa Db−=
+
+
P
Ah
P
Ah
b b
b
e
2
log1
max
max
(2) nA
Pqb
b
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Consulting Structural & Civil Engineers,Dublin 9
Tel: 8301852 / Fax: 8602265
Reference:Output:
** The area taken in calculating QBAR/ha is 50 ha in accordance with paragraph 6.6.1 of Vol 2 of the GDSDS.
0.5 1 2 5 10 20 30 50 100
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
3.2 4.6 5.3 7.6 9.2 11.3 12.5 14.3 17.2
4.3 6.0 6.8 9.6 11.8 14.2 15.7 17.9 21.2
5.0 7.0 7.9 11.0 13.4 16.2 17.9 20.3 24.0
6.7 9.1 10.3 14.2 17.0 20.3 22.4 25.3 29.8
8.9 11.9 13.3 18.1 21.6 25.6 28.1 31.4 36.7
11.8 15.5 17.3 23.2 27.5 32.2 35.0 39.2 45.5
15.5 20.2 22.4 29.6 34.8 40.4 43.9 48.8 56.2
18.2 23.5 26.2 34.2 40.0 46.2 50.2 55.4 63.6
24.1 30.7 33.8 43.7 50.6 58.1 62.8 69.1 78.6
31.9 40.0 43.9 55.8 64.2 73.1 78.6 86.0 97.2
39.6 48.8 53.2 66.4 75.6 85.2 91.2 99.1 111.0
46.1 56.3 61.1 75.5 85.4 95.8 102.1 110.6 123.1
Allowance of 20% for Climate Change in accordance with GDSDS
0 m²TOTAL 0 m²
Area (m2)Runoff coefficient
3.581
Hardstanding
355 m²
Design:
Minutes:
Roof Area
Other Record:
QBAR
Inniskeen Grattan Cumman Luthchleas Gale
Prepared:
0.179 m³/sec
Telephone Log:
Site Catchment Characteristics
26144 SG
Checked:
Project:
SG
Total Area
Element:
SAAR
AREA **0.50 km²
SOIL
Permeable Paving
Project No:
Site Catchment Characteristics - Stand
Landscape
Location
Areas Contributing to Infiltration into:
Area
845.0 mm
30 yearsQBAR10 years
2.1
100 years
0.37
Contrbuting Area
Total Total
6 hr
60 min
Allowable Outflow (l/s)
0.85
1 years
2 hr
15.1 mmRP5 60min=
Multiplier
72 hr
12 hr
10 min
15 min
2 min
48 hr
30 min
24 hr
4 hr
5 min
845.0 mm55.3 mm
1
Total
Total Total
DURATION
Growth Curve
Location
RP5 2d=ANNUAL RAINFALL=
0.11 0.22 0.33
Allowable Outflow
0.13
2.61.7
0.27
QBAR/ha (l/s/ha)
Area Location
Areas Contributing to Drainage Network:
355 m²
AreaLocation
TOTAL
0 m²0 m²0 m²
Location Area Location Area
0 m²0 m²
RETURN PERIOD ( YEARS )
Extreme Rainfall Matrix
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Doherty Finegan Kelly Botanic Court, 30 Botanic Road, Glasnevin,
Consulting Structural & Civil Engineers,Dublin 9
Tel: 8301852 / Fax: 8602265
Reference:Output:
RP5 2d=
0.5 1 2 5 10 20 30 50 100
0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
38.9 54.7 63.4 90.7 110.9 135.4 149.8 171.4 205.9
25.9 36.0 41.0 57.6 70.6 85.0 94.3 107.3 127.4
20.2 27.8 31.7 44.2 53.8 64.8 71.5 81.1 96.0
13.4 18.2 20.6 28.3 34.1 40.6 44.9 50.6 59.5
8.9 11.9 13.3 18.1 21.6 25.6 28.1 31.4 36.7
5.9 7.7 8.6 11.6 13.7 16.1 17.5 19.6 22.7
3.9 5.0 5.6 7.4 8.7 10.1 11.0 12.2 14.0
3.0 3.9 4.4 5.7 6.7 7.7 8.4 9.2 10.6
2.0 2.6 2.8 3.6 4.2 4.8 5.2 5.8 6.6
1.3 1.7 1.8 2.3 2.7 3.0 3.3 3.6 4.1
0.8 1.0 1.1 1.4 1.6 1.8 1.9 2.1 2.3
0.6 0.8 0.8 1.0 1.2 1.3 1.4 1.5 1.7
Rainfall intensity shown as mm/hr.
DURATION
2880
4320
720
1440
360
30
2
5
10
ANNUAL RAINFALL=
RETURN PERIOD ( YEARS )
120
240
15
60
RP5 60min=15.1 mm
Design:
Minutes:
Prepared:
26144
Element:
Infiltration Trench - Stand
Inniskeen Grattan Cumman Luthchleas Gale
Project:Telephone Log:
Other Record:
Extreme Rainfall Matrix
SG
Checked:
SG
Project No:
845.0 mm55.3 mm
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Doherty Finegan Kelly Botanic Court, 30 Botanic Road, Glasnevin,
Consulting Structural & Civil Engineers,Dublin 9
Tel: 8301852 / Fax: 8602265
Reference:Output:
From CIRIA Report No. 156(1996) - Infiltration Drainage Manual of Good Practice
where:
Area to be Drained
and a is given by:
Soakaway dimensions
The time taken to half-empty the system is given by:
* QOVERFLOW is the averaged flow for the duration given.
hPROVIDED
45.233 -602.814
Vertical Sided System - Time to Empty
Event
1 in 10 years 52.702 hrs
Base Area (Ab)
1 in 100 years 52.930 hrs
30 Years 360.000 min 1.200 m²0.500 m
Width 0.600 m
Infiltration System -- Overflow from Soakaway
1 in 50 years 52.873 hrs
10 Years 360.000 min 1.200 m²0.500 m 28.413 m 0.033 l/sec
hmax
Time to Empty
360.000 min 39.427 -525.442 360.000 min
Return Period Duration
1 in 30 years 52.826 hrs
QOVERFLOW*
-694.409 240.000 min
-1115.971 120.000 min120.000 min 28.641
240.000 min 35.186 40.462 -798.519
33.197 -1293.471
21.937 -3385.923
26.979 -2088.80860.000 min 23.099 -1788.423 60.000 min
30.000 min 18.664 -2880.731 30.000 min
hmax a
15.000 min 14.974 -4614.769 15.000 min 17.720 -5461.308
Duration (D)hmax a Duration (D)
35.670 -475.378
50 Year Return Period 100 Year Return Period
360.000 min 28.413 -378.663 360.000 min
-494.721 240.000 min
-781.452 120.000 min120.000 min 20.056
240.000 min 25.068
20.630 -1597.269
31.641 -624.433
25.575 -996.500
15.000 min 9.923
-1228.615 60.000 min
30.000 min 12.560 -1938.615 30.000 min
60.000 min 15.869
16.541 -2553.038
a Duration (D)hmax a
13.202 -4068.615-3058.231 15.000 min
0.013
Length 2.000 m
Base Area (Ab)1.200 m²
Duration (D)hmax
10 Year Return Period 30 Year Return Period
Assume - Aquacells (n)0.40
Hmax Calculation
Perimeter (P)5.200 m
AD 355.000 m²
Ab/P=0.231
b=
q
3.600 mm/hr
FOS Minor Inconvenience 3.00
0.001 m/hr
Description Type Result Equations Applied to Determine hmax
SG
Infiltration Rate Soil
Inniskeen Grattan Cumman Luthchleas Gale Minutes:Other Record:
Project:Design:Telephone Log:
Project No:Element:Prepared:
35.670 m 0.055 l/sec
Infiltration Trench - Stand SG
Vertical Sided System
100 Years 360.000 min 1.200 m²0.500 m 45.233 m 0.091 l/sec
Checked:
26144
39.427 m 0.068 l/sec50 Years 360.000 min 1.200 m²0.500 m
(1) )1()(
max −=−bDeah
(3) Pq
iA
P
Aa Db−=
+
+
P
Ah
P
Ah
b b
b
e
2
log1
max
max
(2) nA
Pqb
b
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