The document provides details on proposed infrastructure improvements for a hydrologic study area, including: 1) Culverts to convey internal water flow through the northern border. Details on 4 proposed culverts are provided. 2) Two proposed Irish crossings along the western border road to convey internal water flow outside the project area. 3) Raising the design level of the northern access road between stations 1+850 and 4+025 by 1 meter, with modifications based on road design standards and roadside protection implemented. 4) Delineation of internal wadies crossings with internal roads based on flood simulation, with recommendations for roadside protection. A table lists 16 proposed road segments and lengths.

1. 96 Hydrologic Study GS-2161
2- Culverts:
To convey the internal flow through the northern border.
Hydraulic reports of the proposed culverts (Fig. 20)
3- Irish crossings:
Implementing two Irish crossings along the western border road (Fig 17),
to convey the internal flow outside the project side. Typical section of Irish
crossing in appendices.
4- Northern Access Road-2:
The current study suggests raising the design level of the northern access
road-2 by 1 meter between road stations 1+850 and 4+025 (the current design
profile has been provided by the client, refer to appendices), CEEC Co. should
consider relative modifications of the road corridor based on road design
Ministry of Transport (MOT) standards. in addition to implementing road-side
protection for both roadsides (grouted rock riprap, 150 mm D50).
5- Internal Roads:
Based on 2D Flood simulation, the current study delineated internal
wadies crossings with the internal roads and suggests road-side protection (0.3m
subgrade covered with class B concrete 0.15m thick) (Table 11) and (Fig. 17).
Culvert
#
Peak
Flow
(m
3
/s)
Easting Northing
Type
Barrels
#
Span
(mm)
Rise
(mm)
US
invert
DS
invert
Length
(m)
Skew
Angle
C1 2.23 516903.351 2497877.551 Pipe 3 1000 1000 12.65 12.57 40 -45
C2 0.30 516700.926 2497877.539 Pipe 1 750 750 12.29 11.45 40 0
C3 0.20 516459.570 2497880.309 Pipe 1 500 500 13.00 12.82 40 45
C4 0.80 515974.467 2497880.752 Pipe 1 1000 1000 9.88 9.38 40 -45
Irish Crossing #
Start End
Easting Northing Easting Northing
1 516108.564 2496735.248 516190.665 2496488.043
2 515842.413 2497524.678 515770.480 2497739.551

2. 97 Hydrologic Study GS-2161
Table 11: Proposed road-side protection of internal roads
Road
Segment
X start Y start X end Y end Length
1 518325.430 2497007.340 518325.284 2497168.767 161.4
2 517923.710 2497260.560 517923.710 2497371.685 111.1
3 517606.209 2497192.430 517605.762 2497480.416 288.0
4 517290.032 2497574.753 517290.693 2497705.061 130.3
5 516973.192 2497773.853 516973.192 2497865.134 91.3
6 516340.308 2497298.263 516340.837 2497449.076 150.8
7 516024.642 2497369.489 516024.642 2497477.439 108.0
8 516340.356 2496444.460 516340.356 2496587.335 142.9
9 516657.952 2496461.962 516657.857 2496591.568 129.6
10 516974.299 2496540.768 516974.299 2496751.377 210.6
11 517288.389 2496477.771 517289.712 2496968.574 490.8
12 517607.213 2496465.865 517604.567 2496721.188 255.3
13 517923.390 2496487.031 517924.713 2496591.542 104.5
14 516459.580 2495720.813 516430.476 2495809.449 93.3
15 516355.069 2496030.376 516324.642 2496122.980 97.5
16 517606.716 2497949.166 517606.716 2498029.864 80.7

3. 98 Hydrologic Study GS-2161
Fig
17:
Suggested
hydrologic
solutions
to
mitigate
flood
risks.

4. There are some points need to be clarified
 MODON logo
Modon logo shall be added in the report and the drawings
 The Data Collection part
1. According to the hydrology study for Rabigh industrial city there are 3 main wadies affecting
the whole city as shown in the figure below, only two wadis effect on the project area one in
the north boundary and the other in the middle of the land. Accordingly, it is recommended
that 2 channels to be designed along the wadies paths.
2. According to the rain fall analysis –and to the Thiessen polygon the rainfall used was only J-
140 , so for accurate design 3 rainfall stations ( J140 – J 116 – J 219 ) to be considered in
Appendix (XXX)
3. Appendix (the rain fall data) show that the end year for the rain station was 2015, where it is
mentioned that in the report years for the rain stations from 1966 to 2021, please unify
4. For Figure no 3a, 3b,5, 6a the catchments areas to be shown
5. All the source data as the maps , Dems used in the study to be submitted separately in
addition to present it in the report.
6. As software “HEC-RAS , Culvert master , Civil 3d” are used in the study, pleas added in
software list in the report.
7. Report to include some photos with descriptions clarifying status around the project area.
 The solution chapter
1. The proposed solution by constructing a dyke to protect the Elec. Substation is not
recommended, as it would be resulted that the storm water shall be directed towards the
south zone of the industrial city. It is recommended that to construct an open channel
discharging the flow to the existing outfall of Asfan road.
MODON to provide logo for adding in report
and drawings
EPC didnt receive this drawing during
bidding. 3 hydrology studies done
and confirmed same recommendation.
Based on that the project is already
constructed.
Request MODON to cancel the
comment.
Response from GECO
Response from GECO
Response from GECO
Response from GECO
Response from GECO
Response from GECO
Due to Topography, dyke is diverting water to existing culvert. Water is coming to marked zone even in absence of
dyke. Dyke is not impacting flow of water to marked area.
EPC didnt receive this drawing during bidding. 3 hydrology studies were done and confirmed same recommendation.
Based on that the project is already constructed. Request MODON to cancel the comment.
response from GECO

5. 2. Table 10 for existing culverts , the water depth should be added in the table
3. A proposed an open channel to be constructed along the wadi path in the northern road to
Asfan road up to industrial area should be designed as open channel to the outfall after the
Asfan road.
4. For the access road it should be reviewed by the Road department and with the storm
protection solution
5. In the DWG it was mentioned side ditch in the layout it was dyke, so please clarify.
6. Basis of selecting the Irish crossing to be clarified
From GECO
reply to Point3. EPC didnt receive this drawing during bidding. 3 hydrology studies were done and confirmed same
recommendation. Based on that the project is already constructed. Request MODON to cancel the comment.
Attach access road drawing approved by MOT
Update DWG file to
mention Dyke
To allow internal water to flow to the dedicated culvert

6.  Submitted Drawings
1. Provide the profile for the side ditch / open channel
2. Provide the cross section for the roads with the side ditch and dyke.
3. The project boundary in the report not matching with the drawings.
4. Add the catchment area with project boundary with wadi and the streams
 Missing software to be submitted
1. HEC-RAS.
2. WMS separate folder not included in the HEC-HMS.
3. Civil 3d.
4. Hyfran plus.
from GECO
From GECO

7. Entrance
Access road
SEC SUBSTATION
EMERGENCYEXIT
1 2 3 4 5 6
7 8 9
* 0 #
1 2 3
4 5 6
7 8 9
* 0 #
REJECTION
LANE
G
R
G
R
ENTRY
EXIT
G
R
AUX
N
SUBSTATION
A03TX01
A03TX02 A03TX03 A03TX04
A04TX01
A04TX02 A04TX03 A04TX04
A05TX01
A05TX02 A05TX03 A05TX04
A06TX01 A06TX02 A06TX03 A06TX04
A07TX01
A07TX02 A07TX03 A07TX04
B01TX01
B01TX02
B01TX03
B07TX04
B02TX01
B02TX02
B04TX01
B06TX01
B06TX02
B06TX03
B07TX01
B05TX01
B05TX02
B04TX03
B04TX04
B07TX02
B05TX03
B05TX04
B04TX02
A01TX01
A01TX02
A01TX03
A02TX01
A02TX02
A02TX03
B03TX01
B03TX02 B03TX04
B07TX03
B03TX03
B06TX04
B02TX03
Access road
Access road
Access road
ToSubstationwith7mwidthofpavement
ToSECSubstationwith6mwidthofpavement
with6mwidthofpavement
with6mwidthofpavement
Access road
Tothesiteroadwith6mwidthofpavement
A
c
c
e
s
s
ro
a
d
To
th
e
sit
e
ro
ad
wi
th
6m
wi
dt
h
of
pa
ve
m
en
t
50.00
50.00
CHECKED BY
APPROVED BY
REVIEWED BY
APPROVED
DESIGNED
PARTICULARS
AMENDMENTS
REV DATE
DATE
SCALE
DESIGNEDBY
DWG NO
CONTRACTOR:
DESIGN
PROJECT
INSTITUTE:
OFFTAKER
PAPER SIZE
A1
SHEET NO
OWNER
ENGINEER:
COMPANY
OWNER:
CHINA ENERGY ENGINEERING GROUP GUANGDONG POWER ENGINEERING CO. LTD.
SOUTH RABIGH RENEWABLE ENERGY COMPANY
OCA CTE
CENTRAL SOUTHERN CHINA ELECTRIC POWER DESIGN INSTITUTE
CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP
SAUDI POWER PROCUREMENT COMPANY
Rabigh Solar PV Independent Power Plant - 300MW
LIST OF REFERENCE DRAWINGS
NO. DRAWING NO. REV.
DRAWING TITLE
FA
DETAILED DESIGN
SohaibAnwer
Sohaib Access Road
Construction drawings
RAB-DW-GP-PV-006
IssuedforDetailedDesign
2022.09.18
01
Mada Altoroq
Contracting Est
01 of 37
01 RAB-DW-GP-PV-001 GeneralLayoutofthePVSite 02
SohaibAnwer
Revisedasperrev.01comments
2023.02.04
02
Mada Altoroq
Contracting Est
Mada Altoroq
Contracting Est
Mansour
Daniel 1:50
2023.02.11
SohaibAnwer
Revisedasperrev.02comments
2023.02.11
03 Mada Altoroq
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8. GRADE LEVEL
NATURAL
GROUND LEVEL
STATION
HORIZONTAL
ALIGNMENT
SUPERELEVATION
12.72
12.76
12.79
12.83
12.86
12.89
12.93
12.96
12.98
12.99
12.99
12.99
12.99
12.98
12.98
12.97
12.97
12.96
12.94
12.93
12.92
12.91
12.90
12.89
12.88
12.87
12.86
12.86
12.87
12.88
12.88
12.89
12.89
12.90
12.90
12.91
12.91
12.92
12.94
12.96
13.00
13.03
13.06
13.10
13.13
12.72
12.76
12.79
12.82
12.86
12.89
12.93
12.96
12.97
12.98
12.99
12.99
12.99
12.98
12.98
12.98
12.96
12.95
12.94
12.93
12.92
12.91
12.90
12.88
12.87
12.86
12.86
12.85
12.85
12.84
12.84
12.84
12.85
12.87
12.88
12.90
12.91
12.93
12.94
12.97
13.01
13.04
13.07
13.10
13.13
0+000
0+025
0+050
0+075
0+100
0+125
0+150
0+175
0+200
0+225
0+250
0+275
0+300
0+325
0+350
0+375
0+400
0+425
0+450
0+475
0+500
0+525
0+550
0+575
0+600
0+625
0+650
0+675
0+700
0+725
0+750
0+775
0+800
0+825
0+850
0+875
0+900
0+925
0+950
0+975
1+000
1+025
1+050
1+075
1+100
PVI STA = 0+200.000
PVI ELEV = 12.999
A.D. = -0.151%
K = 495.096
BVCS:
0+162.500
BVCE:
12.947
EVCS:
0+237.500
EVCE:
12.994
75.000m VC
HIGH POINT ELEV = 12.994
HIGH POINT STATION = 0+231.317
PVI STA = 0+375.000
PVI ELEV = 12.977
A.D. = -0.030%
K = 2460.829
BVCS:
0+337.500
BVCE:
12.982
EVCS:
0+412.500
EVCE:
12.961
75.000m VC
PVI STA = 0+650.000
PVI ELEV = 12.859
A.D. = 0.065%
K = 1156.190
BVCS:
0+612.500
BVCE:
12.875
EVCS:
0+687.500
EVCE:
12.867
75.000m VC
LOW POINT ELEVATION = 12.864
LOW POINT STATION = 0+662.176
PVI STA = 0+945.000
PVI ELEV = 12.923
A.D. = 0.113%
K = 665.143
BVCS:
0+907.500
BVCE:
12.915
EVCS:
0+982.500
EVCE:
12.974
75.000m VC
E
M
E
R
G
E
N
C
Y
E
X
I
T
A
0
4
T
X
0
1
A
0
5
T
X
0
1
T
o
t
h
e
s
i
t
e
r
o
a
d
w
i
t
h
6
A
A
B
B
Access road
Tothesiteroadwith6mwidthofpavement
3.65
7
.3
3
.6
5
7.3
5
R
3
0
R
3
0
5
2.00
3.65
0.50
5.00
2.5
50.00
50.00
7.00
10.00
LIST OF REFERENCE DRAWINGS
NO. DRAWING NO. REV.
DRAWING TITLE
01 RAB-DW-GP-PV-001 GeneralLayoutofthePVSite 02
KEY PLAN
0+00
0
0+05
0
0+1
00
0+1
50
0+20
0
0+25
0
0+30
0
0+35
0
0+40
0
0+45
0
0+50
0
0+55
0
0+60
0
0+65
0
0+700
0+75
0
0+80
0 0+850 0+900 0+950 1+000 1+050 1+100 1+150 1+200 1+250 1+300 1+350 1+400 1+450 1+500 1+550 1+600 1+650 1+700 1+750 1+800 1+850 1+900 1+950 2+000 2+050 2+100 2+150 2+200 2+250 2+300 2+350
2+
40
0
2+450
2+500
2+550
2+600 2+650 2+700 2+750 2+800 2+850 2+900 2+950 3+000 3+050 3+100 3+150 3+200 3+250 3+300 3+350 3+400 3+450 3+500 3+550 3+600 3+650 3+700 3+750 3+800 3+850 3+900 3+950 4+000
4+
05
0
4+100
4+150
4+200
4+250
4+300
4+350
4+400
4+450
4+473
.844
1+10
0
0+00
0
0+05
0
0+10
0
0+15
0
0+20
0
0+25
0
0+30
0
0+35
0
0+40
0
0+45
0
0+50
0
0+55
0
0+60
0
0+65
0
0+70
0
0+75
0
0+80
0
0+85
0
0+90
0
0+95
0
1+00
0
1+05
0
Entrance
Access road
SEC SUBSTATION
EMERGENCYEXIT
1 2 3
4 5 6
7 8 9
* 0 #
1 2 3
4 5 6
7 8 9
* 0 #
REJECTION
LANE
G
R G
R
ENTRY
EXIT
G
R
Drainage ditch
Drainage
ditch
Drainage culvert
SUBSTATION
A03TX01
A03TX02 A03TX03 A03TX04
A04TX01
A04TX02 A04TX03 A04TX04
A05TX01
A05TX02 A05TX03 A05TX04
A06TX01 A06TX02 A06TX03 A06TX04
A07TX01
A07TX02 A07TX03 A07TX04
B01TX01
B01TX02
B01TX03
B07TX04
B02TX01
B02TX02
B04TX01
B06TX01
B06TX02
B06TX03
B07TX01
B05TX01
B05TX02
B04TX03
B04TX04
B07TX02
B05TX03
B05TX04
B04TX02
A01TX01
A01TX02
A01TX03
A02TX01
A02TX02
A02TX03
B03TX01
B03TX02 B03TX04
B07TX03
B03TX03
B06TX04
B02TX03
Access road
Drainage ditch
Access road
Access road
ToSubstationwith7mwidthofpavement
ToSECSubstationwith6mwidthofpavement
with6mwidthofpavement
with6mwidthofpavement
Access road
Drainage culvert
Drain
age
ditch
Drainage culvert
Tothesiteroadwith6mwidthofpavement
EMERGENCYEXIT
A03TX01
A04TX01
A05TX01
Access road
Tothesiteroadwith6mwidthofpavement
A
A
B
B
Acc
ess
road
To
the
site
road
with
10m
width
of
paveme
nt
3.65
7.3
3.65
7.3
5
R30
R30
5
2.00
3.65
0.50
5.00
2.5
AUX
CHECKED BY
APPROVED BY
REVIEWED BY
APPROVED
DESIGNED
PARTICULARS
AMENDMENTS
REV DATE
DATE
SCALE
DESIGNEDBY
DWG NO
CONTRACTOR:
DESIGN
PROJECT
INSTITUTE:
OFFTAKER
PAPER SIZE
A1
SHEET NO
OWNER
ENGINEER:
COMPANY
OWNER:
CHINA ENERGY ENGINEERING GROUP GUANGDONG POWER ENGINEERING CO. LTD.
SOUTH RABIGH RENEWABLE ENERGY COMPANY
OCA CTE
CENTRAL SOUTHERN CHINA ELECTRIC POWER DESIGN INSTITUTE
CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP
SAUDI POWER PROCUREMENT COMPANY
Rabigh Solar PV Independent Power Plant - 300MW
LIST OF REFERENCE DRAWINGS
NO. DRAWING NO. REV.
DRAWING TITLE
FA
DETAILED DESIGN
SohaibAnwer
Sohaib Access Road
Construction drawings
RAB-DW-GP-PV-006
IssuedforDetailedDesign
2022.09.18
01
Mada Altoroq
Contracting Est
02 of 37
01 RAB-DW-GP-PV-001 GeneralLayoutofthePVSite 02
SohaibAnwer
Revisedasperrev.01comments
2023.02.04
02
Mada Altoroq
Contracting Est
Mada Altoroq
Contracting Est
Mansour
Daniel 1:50
2023.02.11
SohaibAnwer
Revisedasperrev.02comments
2023.02.11
03 Mada Altoroq
Contracting Est