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RHD Operational Procedure Zonal Operation Wing
 
Zonal Operations
 
OP/ZF/1.5 - Design of Revenue & Development Works
 
Purpose and Scope :

This procedure covers the design process to be adopted by Zones for approved GoB funded revenue and development works to be undertaken by them.
 
Definitions :

Road Design - is deemed to include the geometric design of roads; the design of road pavements, embankments and cuttings; the design of traffic aids and road markings; and the hydrological/structural design of culverts and bridges.

Revenue Works - is deemed to include both routine and periodic maintenance works that are to be undertaken by contractors and funded by GoB.

Development Works - is deemed to include GoB funded works included in the Annual Development Programme (i.e. excluding foreign aided works that are to be designed by foreign consultants).
 
Responsibility :

Additional Chief engineer - Zones (ACE-Z) - has overall responsibility for the design of GoB funded revenue and development works within a zone.

Executive Engineer - Field Division (EE-FD) - responsible for preparing designs of GoB funded revenue and development works within a division.

Superintending Engineer - Design Circle - (SE-DC) - responsible for undertaking designs on behalf of zones when they have inadequate resources to undertake designs themselves.
 
Method :

4.1 GENERAL

Where Zones are to undertake GoB funded revenue and development works using contractors, tender documents must be prepared and these must include design drawings for the works. The scope and detail of these drawings will vary depending on the type of works involved. Volume 4 of the RHD Standard Tender Documents will contain Standard details for most aspects of road designs and a number of typical details for bridge works (e.g. parapets).

The design of new bridges and box culverts together with major periodic maintenance to them will be undertaken by Bridge Design Circle or consultants engaged by them. Co-ordination of these works with other works on the same road will be the responsibility of the relevant ACE-zone as part of their Annual Works Programme.

4.2 DESIGN OF ROUTINE AND MINOR PERIODIC MAINTENANCE BY CONTRACTORS

Very little design is required for these types of works and the design details that may be required will be included from the RHD Standard Details.

However, tender documents for these works must include a plan showing the location of the works. This plan should include the road name, link number, and the work limits (chainage from/to). Other identifying features to locate the works such as local villages and rod junctions along the road should be included in the plan. The plan should also show the type of works proposed within the work limits, making reference to the RHD Standard Details for the different aspects of the works to be undertaken.

4.3 MAJOR PERIODIC MAINTENANCE WORKS

For selected road links the required Periodic Maintenance works will have been identified in the RHD Annual Road Network Maintenance & Rehabilitation Needs Report.

With respect to roads, in almost all cases, this type of maintenance will take the form of some type of surface treatment or overlay to an existing road. Other minor works (such as improvements to road junctions and the provision of road markings/signs) may also be included in these works.

Standard details for the alternative forms of surface treatment and overlays are contained in the RHD Standard Details, together with standard drawings for alternative junction layouts, signs, road markings, etc. These should be included in the Tender Documents for the works, together with a plan layout showing the location and description of the works (as described in 4.2 above).

With respect to bridges, box culverts and other structures periodic maintenance requirements will be identified in the RHD Annual Bridge Network Maintenance & Rehabilitation Report. These works will require to be designed by the Bridge Design Circle by consultants retained by them. Construction must then be coordinated with the Bridge Construction and Maintenance Circle.

4.4 DEVELOPMENT WORKS

Works that are to be undertaken under the Annual Development Programme will generally fall into two categories, namely:

i) Foreign Aided Projects that will be designed by consultants.

ii) GoB funded works that will be designed by the RHD, or consultants retained for this purpose.

With respect to GoB funded works, as previously stated all bridges, box culverts and other structures will be designed by RHD Bridge Wing or consultants retained by them. The Field Division will be responsible for the design of new roads and/or road widening schemes, according to RHD's standard for Road Design (geometric, pavements and Road Safety Features.

Where Field Divisions do not have the resources to undertake such designs, the Superintending Officer for the particular works (the ACE-zone or SE-Field Circle as appropriate) can submit a request to CE-RHD for the design to be undertaken by SE-Road Design & Safety Circle. Subject to the approval of CE-RHD the design may be undertaken by Road Design & Safety Circle or consultants retained by them (if they have insufficient resources). The attached flow diagram outlines this process.

Irrespective of who performs the design it should be undertaken in accordance with Operational Procedure OP/RDS/2.1. It should include a complete set of design drawings with supporting calculations where appropriate.
 
References :

OP/RDS/2.1 - Road Design

OP/PD/2.4 - Procurement of Consultancy Services

Annual RHD Road Network Maintenance & Rehabilitation Need Reports

Annual Development Programme (ADP)
 
Procedure Flowchart :

The procedure flowchart for this procedure is detailed below -
 


 


 

 

For duties associated with each grade of personnel see

 

Updated on : 1/12/2003

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