DETAILED ENGINEERING DESIGN (DED) AND

BIDDING DOCUMENTS FOR ROAD LINK A13 JCT.

AIASA (A05) TO JCT. CASA (A02)
AINARO MUNICIPALITY
(24.2km)

MARCH 6, 2023

CONSULTANT:
DJMV Management Consultancy in JV width Keyala
Consultancy, Unip. Lda
PROPOSED PROJECT ALIGNMENT
The project is owned by the employer which is the
PROPOSED Ministry of public works (MPW) of Republic
DESCRIPTION
Democratic of Timor – Leste. This project is administered Directorate of Roads, Bridges, and
Flood Control (DRBFC) and Directorate General of the Public Works (DGPW).

This projects link two (2) roads namely the A13 Jct. Aiasa (A05) to Junction Casa (A02). The
project is Preparation of Detailed Engineering Design and Bidding Documents for the road
project.

The proposed project is about 24.1 km including 2 major bridge located at the beginning and
end of the project. The project will traverse area which are from rolling to mountainous terrain.
The project will start at junction Aiasa and terminates at Junction Casa.

The Components of this project will be preparation of Highway, Bridge, Drainage, Slope
Protection and Pavement Design. All design will be in accordance with the specifications and
standards set by the government of Timor-Leste.
THIS PRESENTATION CONSISTS THE
FOLLOWING AGENDA:

1. Experience of Consultant
2. Approach & Methodology
3. Work Schedule and Planning for
….Deliverables
4. Team Composition and Input of each Key
….Experts
1. Experience of Consultant
OTHER ROADS BRIDGES FLOOD CONTROL PROJECTS
OTHER ROADS BRIDGES FLOOD CONTROL PROJECTS
OTHER ROADS BRIDGES FLOOD CONTROL PROJECTS
OTHER ROADS BRIDGES FLOOD CONTROL PROJECTS
 2. Approach and Methodology
1.BASIC PLANNING CONCEPT
In planning the methodology for a transportation project, particularly the Project Consulting services for
preparation of detailed engineering design (DED) and Bidding documents for road link A13 jct.
(A05) to jct. Casa (A02) in the municipality of Ainaro, it is the Consultant's aim to perform the work in
accordance with the highest professional standards and execute the project activities to be undertaken with
minimum cost, time and personnel without sacrificing the quality of the design.

2. DEVELOPMENT OF ALTERNATIVE SOLUTIONS

To arrive at the best solution for the Project, three (3) alternatives for the project will be developed. These
alternatives will be evaluated, and the best solution will be selected.

3. ESTABLISHMENT OF DESIGN CRITERIA AND STANDARDS

In order to establish design criteria and standards that will consider economics, structural durability, right-of-
way availability and constraints, and social and environmental impacts among others, the following factors
will be analyzed:
Applicability to Existing Conditions
Coordination with Concerned Agencies

4. PRINCIPLES IN ENGINEERING APPROACH

The Consultant's approach to the Project involves design of the Road with the engineering and management
expertise that will permit:
Development of an engineering approach that will meet the goals and objectives established by the client,
Preparation of contract documents for the Project, and
Transfer of the Consultant's expertise to Ministry of Public Works (MPW) of Republic
Democratic of Timor-Leste counterpart staff and introduction of new technology.
5. COST EFFECTIVE DESIGN
The Consultant is aware that the highway administrators face "needs versus funds" problems. Under these
circumstances, cost-effective design shall be emphasized. To achieve this, the Consultant will develop all
possible alternatives for every problem and evaluate such alternatives to select the optimum solution for
each problem.

6. EARLY COMPLETION OF THE PROJECT

The Consultant fully understands the necessity of early completion of the project. To realize this, the
Consultant will implement the "Effective Schedule Control System", on a detailed and clearly defined work
plan covering all tasks, item by item, in all stages of detailed design, pre-construction and construction
supervision. In addition, the "Comprehensive Quality Control System" developed by the Consultant will be
observed strictly to ensure quality workmanship and avoid delays caused by reworking and replacing.

Close coordination and communication among Consultants, its Associates and with The Directorate of Roads,
Bridges and Flood Control (DRBFC) under the Ministry of Public Works will be required to expedite
implementation.
 TECHNICAL METHODOLOGY
A. INTRODUCTION
This chapter provides details about the Consultant's envisaged methodology for the Project Consulting
services for preparation of detailed engineering design (DED) and Bidding documents for road
link A13 jct. (A05) to jct. Casa (A02) in the municipality of Ainaro, under the Ministry of Public Works
(MPW) of The Republic Democratic of Timor-Leste.

B. REVIEW OF AVAILABLE INFORMATION IF AVAILABLE

Review Previous Documents - In carrying out the Services, the Consultant will closely coordinate with The
Directorate of Roads, Bridges and Flood Control (DRBFC) under the Ministry of Public Works. Consultant to
review previous documents such as Topographic Survey, Geotechnical Reports, Hydrology and Hydraulic
Assessment, Geological Conditions, Bridge Design and River Training Protection and Pavement Design to
carry out proper detailed engineering design. The Consultant shall define and recommend option to maintain
or renew the alignment.

Review Road Components- Works include Road Safety, street lightings and traffic light, works to incorporate
in the project.
 TECHNICAL METHODOLOGY
C. PRELIMINARY SITE INVESTIGATION AND DATA COLLECTION

In this section, the consultant will gather data and information physically and by the aid
of equipment. Data and information to be gathered are as follows:
1. Physical Characteristics of project alignment
2. Village and Residential Sections Identification
3. Visual Survey and Investigation
4. Geotechnical and Geological Information
5. Construction Material Investigation
6. Drainage, hydrologic and hydraulic investigations
7. Hydrology and Hydraulic Analyses
8. Topographic survey
9. Applicable Design Standards
10. Road Safety Audit (Preliminary and Final Design)
11. Specific Criteria
12. Specifications
13. Drawings and Plans
14. Bidding Documents
15. Environmental Impact Assessments
 TECHNICAL METHODOLOGY

D. DETAILED ENGINEERING DESIGN STAGE

During this stage, further updating of site investigation of the Project roads and disaster areas will be conducted by
the Consultant. This investigation will be conducted in accordance with established and accepted engineering
principles. Selected key personnel of the Consultant (i.e. experts in each relevant field of visual site investigation)
will be mobilized to undertake the site investigation as needed. The site investigation shall be carried together with
representatives from the Project owner so that all possible changes and/or recommendations can be immediately
discussed and resolved on the site.
 TECHNICAL METHODOLOGY
A. SURVEY REQUIREMENT
1. FLOOD CONDITION ALONG THE PROJECT AREA
A detailed flood survey and investigation will be conducted by the consultant, this includes interviews to residence,
water marks identification, flood history and other matters that will contribute int the preparation of the project.

Data collection and confirmation of the availability to topographic maps, river cross-sections and profiles, flood
records and other data from the regional and district offices.

2. TOPOGRAPHIC AND HYDROGRAPHIC (RIVER) SURVEY

As already pointed out in the approach to the Project, the Consultant shall make optimum utilization of the previous
data. Thus, the Consultant shall undertake careful verification surveys of existing topographic and river survey data,
if any, from the FS and previous experience of the consultant in the conduct of Topographic and River survey. Upon
careful review and analysis of the Terms of Reference (TOR), the required tasks as viewed by the Consultant are as
follows:
Establishment of horizontal ground control
Establishment of vertical ground control
Permanent Bench Mark (PBM)
Intermediate Bench Mark (IBM)
Establishment of traverse stations.
Vertical Control Leveling Survey
Setting of Point of Intersections (Pl's), curve points, 20m stationing and reference points.
 TECHNICAL METHODOLOGY

3. TOPOGRAPHIC SURVEY ALONG ROADS

The Consultant will carry out the topographic survey necessary for the detailed engineering design of
the Project work scope. After the evaluation of available data from previous study if available and
results of site investigation/verification survey of the Project, a survey team shall be organized to
perform the topographic survey of the following:

- Proposed road alignment route

- Proposed bridge and culverts expansion sites
- Slope and erosion "disaster'' areas

The level of detail of the field surveys will be in accordance with the Ministry of Public Works (MPW)
Design Guidelines.

All of the information and date resulting from the field surveys will be recorded in standard survey field
books. These field books will be turned over to the Ministry of Public Works (MPW) after the detailed
design has been completed.
 HIGHWAY DESIGN
B. STABLISHMENT OF DESIGN CRITERIA
Design criteria and standards will have to be formulated as a reference in the development of the
bridge and channel improvement project design. These standards will be determined to suit the
specified requirements of the project.
The following aspects will be considered in the formulation of the design criteria:
a. Overall Project short-term and long-term cost implications
b. Technical feasibility
c. Socio-economic soundness
d. Environmental/aesthetics aspects
e. Meteorological, topographic and geological conditions
f. Public convenience
All of the above aspects shall be taken into account when considering the most practical and
economical solutions to the problems associated with the Project. The Consultant will coordinate
closely with the concerned MPW officials in framing the design standards and criteria for the works.
The Consultant shall adhere closely to the guidelines and established design standards prescribed
or to be prescribed by the MPW.
 HIGHWAY DESIGN
C. GEOMETRIC DESIGN
Horizontal Alignment
Establishment of the horizontal alignment includes the introduction of transition spirals with
adequate radius of circular curves between the tangents, complemented by proper super-elevation
rate and widening in accordance with the established design speed.
 HIGHWAY DESIGN
Vertical Alignment
The proposed vertical alignment would be established with reference to the following factors:
a. On inundated areas, the pavement structure elevation would be established with sufficient
freeboard from the maximum water or flood level. In this proposal, the freeboard should be reckoned
from the bottom of sub-base to preclude its saturation.
b. The design grade if necessary would be raised by a sufficient distance or height from the identified
level of existing water table.
c. Grades would be established according to the recommended design speed for the projected design
traffic, level of service and in keeping with the goal of encouraging uniform operation throughout.
d. The provision of adequate stopping sight distance would be considered as the most important
criterion in the design of vertical curvature.
e. On crest curvatures, the rate of change in curvature is the critical element in designing ample sight
distance for the given design speed.
f. On sag curves, headlight sight distance during night driving is commonly the criterion by which
adequate stopping sight distance is provided.
 HIGHWAY DESIGN
Terrain
To characterize variations, engineers generally separate topography into three classifications according
to terrain.
- Level Terrain: is that condition where highway sight distances, as governed by both horizontal and
vertical restriction, are generally long or could be made to be so without construction difficulty or major
expense.
- Rolling Terrain: is that condition where the natural slopes consistently rise above and fall below the
road or street grade and where occasional steep slopes offer some restriction to normal horizontal and
vertical roadway alignment.
- Mountainous Terrain: is that condition where longitudinal and transverse changes in the elevation of the
ground with respect to the road or street are abrupt and where benching and side hill excavation are
frequently required to obtain acceptable horizontal and vertical alignment.
Grades
The grade line is a reference line by which the elevation of the pavement and other features of the
highway are established. It is controlled mainly by topography, type of highway, horizontal alignment,
safety, sight distance, construction costs, cultural development, drainage and pleasing appearance. The
performance of heavy vehicles on a grade shall also be considered.
 PAVEMENT DESIGN

The procedure of the thickness design will be similar among the above types, which will include
estimation of traffic load cumulative over the design period, evaluation of bearing capacity of sub-
grade and effective thickness of the existing pavement based on the results of geotechnical
investigation, estimation of the required structural number of overlay or new pavement, and its
conversion into overlay or layer thickness.

The pavement thickness design will be based on the MPW standards, AASHTO standards or other
appropriate standards.
Estimation of ESAL
Past cumulative Equivalent Single Axe Load (ESAL) will be estimated based on the past traffic data
for use in the elevation of the remaining life of the existing pavement. Future ESAL will be
estimated based on the results of the traffic forecast and prediction of future axle load distribution.
 DRAINAGE DESIGN
Analysis shall be conducted to compute for peak flood discharges at various point of interest
traverse by proposed road alignment.
Design Storm
Structure Types
Frequency
Bridge 1 in 50 years
• Watershed Parameters
Reinforced Conc. Box
1 in 25 years
Culvert
Reinforced Conc. Pipe
• Design Flood Frequency Culvert
1 in 25 years

Embankment 1 in 10 years
Road Surface & Side
• Rainfall Intensity 1 in 5 years
Drainage
Development of Rainfall Intensity Duration Frequency (RIDF) curve for each return
period derived from daily rainfall data.
DRAINAGE DESIGN

• Runoff Analysis
To estimate the magnitude of peak flow
or stormwater surface runoff, two method
will be introduced in the project.

i. Rational Method
ii. SCS-UH (Soil Conservative Service –
Unit hydrograph), by Hydrologic
Engineering Corp – Hydrologic
Modeling System (HEC-HMS).
 DRAINAGE DESIGN
DRAINAGE CULVERT STRUCTURES
• The drainage structure should be sufficient to ensure the design
stormwater surface runoff can safely pass through without
endangering the stability of road embankment
• Conform with AASHTO Highway Drainage Guidelines and
Timor-Leste Standard and Specification
RCBC

TYPES OF CULVERT
i. Reinforced Concrete Box Culvert (RCBC)
ii. Reinforced Concrete Pipe Culvert (RCPC)

900 mm, 1000 mm,

1200mm & 1500mm diameter
 BRIDGE DESIGN
BRIDGE DESIGN
1. Establishment of Design Criteria
The bridge design criteria such as bridge width, freeboard, design load (dead load, live load, impact, seismic, etc), combination of
loads, design method, material strength, etc. will be established by referring to the following applicable standards and guidelines:
a. National Structural Code of the Republic Democratic of Timor-Leste (NSCRDTL).
b. MSHTO, Standard Specification for Highway Bridges
c. MSHTO, A Policy on Geometric Design of Highway and Streets
d. MPW, Highway Design Guidelines
e. MPW, Bridge Design Guidelines
f. MSHTO, Standard Specification for Seismic Design of Highway Bridges, 1996
 BRIDGE DESIGN
2. Other data for consideration in Bridge Design
a. Catchment area
b. Length of stream
c. Rainfall Intensity Analysis
d. Regression Analysis for Rainfall Data
e. Observed Maximum Flood Level
f. Design Maximum Flood Level (Hydraulic Analysis)
g. Discharge Calculation (Hydrology Analysis)
 GEOTECHNICAL INVESTIGATION
In order to provide a suitable stability analysis, a proper program for the geotechnical assessment has
to include a series of steps to understand the subsurface materials. The following are the activities
carried out for the geotechnical assessment:

• Drilling of boreholes;
• Standard Penetration Test (SPT) and disturbed sampling;
• Coring at layers with >50 N value (if applicable);
• Test Pit sampling; and
• Basic laboratory tests in ASTM standards.
 TEST PIT SAMPLING

The geotechnical investigation shall include the

following activities:
i. Detailed soil investigation along the
proposed alignment by test pit at 250m
interval to obtain sub-surface properties
and California Bearing Ratio (CBR).
ii. Material sources sampling for construction
materials such as sand and aggregates.
iii. Geologic mapping for slope stability
analysis.
Soil Sample Extraction Schematic for Test Pit Sampling
 STANDARD PENETRATION TEST

The Standard Penetration Test (as shown in succeeding Figure) is the most economical method in
obtaining the subsurface information. The test is done following the procedures and criteria of the
ASTM D-1586 standard. A 63.5-kg (140-lb.) driving mass (or hammer) is set to fall “free” from a
height of 760 mm (30 in) to drive the standard split barrel (as shown in Figure 18) into the soil at the
bottom of each interval depth of boring in three (3) successive 15 cm depths (6 inches). The number
of blows enough to drive the sampler is counted and obtained to be the N-value.
Standard Penetration Test Set-
up
 ENVIRONMETAL IMPACT ASSESSMENT
The SEIS I EMP preparation will involve the on the environment, to optimize the economic
following: viability of the proposed Project and to
eliminate the need for long term recurrent
-Review of the existing environmental
expenditures to redress adverse environmental
conditions and parameters within the study
consequences.
areas in order to permit analysis and
assessment of the environmental impacts
generated by the proposed works and the
operational changes to be carried out under
the Project and after project implementation.
-To re-evaluate, in the context of each of the
specific components of the Project, the short
and long• term impacts which are likely to
occur, and assess the recommendations on
environmental mitigation measures contained
in the original SEIS; and
-To determine additional suitable mitigation,
control and/or abatement measures, including
monitoring activities, to be adopted to
minimize or eliminate any deleterious effects
 MATERIAL SOURCES INVESTIGATION
The Consultant will exert all efforts to locate all In like manner accessibility and suitability of
existing and possible sources of materials within materials and source location will also be
the most economical haul distance to the considered recognizing its great impact on the
project structures. The quality and estimated cost of the project. Sites of suitable materials
quantity of materials shall both be investigated will be surveyed and shown in the plans and
to determine its suitability for borrow, sub-base, results of the materials sources investigations
base course, riprap for erosion and protection will be included in the Soils and Materials
works, and filter for drains, fine and coarse Report.
aggregates and water. The materials source
map of the District or Provincial Engineers Office
will be secured and will be studied and Samples to be taken shall be of the following
investigated as a helpful guide to facilitate the areas:
performance of the work.
min. of 50 kgs. for fine-grain soils;
min. of 50 kgs. for fine and coarse aggregates;
min. of 50 kgs. for sub-base and base course.
3. WORK SCHEDULE AND PLANNING FOR DELIVERABLES
4. TEAM COMPOSITION AND INPUT OF EACH KEY
EXPERTS
 DJMV Management Consultancy
Organizational Structure

GENERAL MANAGER

PROJECT DEVELOPMENT OFFICER AND ADMINISTRATIVE

OPERATIONS MANAGER
BUSINESS MANAGER AND FINANCE

CONSULTANTS

TRANSPORTATION AND ENVIRONMENTAL AND

URBAN PLANNING
INFRASTRUCTURE SOCIAL
ORGINIZATIONAL CHART (KEYALA CONSULTANT)
 SUBMITTED
REPORTS

1. Pavement Design Report

2. Highway Design Report
3. Drainage Design Report
4. Bridge Design Report
5. Topographic Survey Report
6. Geotechnical Investigation Report.
7. Quantity Calculation
8. Safety Audit Report
9. Environmental Empact Assessment Report
10. Bidding Documents

DRAWINGS
11. HIGHWAY & DRAINAGE DESIGN DRAWINGS
12. BRIDGE DESIGN DRAWINGS
 END
OF THE
P R E S E N TAT I O N

THA NK YOU V E RY
M UC H