Design Review Questions


Number Question

Documentation to be Submitted

1.1 Layout Plan
1.1.1 Sufficient information for setting out the works, ie coordinates, offsets, reference pegs, benchmarks and dimensions
1.1.2 Adjacent cadastral information must be shown.
1.1.3 Correct geodetic system.
1.1.4 Street names and Erf numbers (Not Street 1, Street 2...)
1.2 Traffic Control
1.2.1 Traffic Control Plans showing how vechiles and pedestrians will be accommodated.
1.3 Environmental
1.3.1 Proof of Authorisation to undertake the work as required under the National Environmental Management Act (Act 107 of 1998) and the Environmental Impact Assessment Regulations (2006).
1.4 Other
1.4.1 Plans of stormwater pipes/culverts/channels through park areas with proof of consent from relevant department.
2 Streets
2.1 Geometric Design

A layout plan must be provided, showing the road classification (Classes 1 to 5f according to Chapter 5 in Red Book) as well as all other relevant information such as street names, erf numbers, cadastral information, dimensions etc.

2.1.2 Street widths (Indicated on layout plan and cross-sections):
2.1.3 Reserve widths (on layout plan and cross-sections):
2.1.4 Position of streets in road reserves (on layout plan and cross-sections).
2.1.5 Evaluate proposed geometrical layout in terms of adjacent layouts
2.1.6 Minimum centre-line radii of bends (Table 5.9 and 5.10 in the Red Book).
2.1.7 Making bends wider on Class 4 roads where minimum radius of 150m is not possible (Table 5.8 in the Red Book).
2.1.8 Setting-out information for horizontal curves.
2.1.9 Radii of bellmouths according to standard detail drawings.
2.1.10 Turning circles at cul-de-sacs.
2.1.14 An approved plan from relevant provincial authority must be provided for all road intersections at provincial roads.
2.1.15 Check clearance between kerb edge and erf boundary on curves and bellmouths.
2.2 Vertical Alignment
2.2.1 Longitudinal sections must be provided for all streets
2.2.2 Chainages must be indicated at 20m intervals on longitudinal-sections (10m intervals in low points) and at 100m intervals on the layout plan.
2.2.3 The minimum gradient of streets is 0.67% (1:150).
2.2.4 In low points (Class 4 and 5 roads), a minimum difference in level of 30mm (0,3% effective) must be maintained over every 10m chainage.

Maximum gradient:

Class 4 5a 5b-f
Slope 1:10 max. (10%) 1:8 max. (12.5%) 1:5 max. (20%)
Length 100m max. 70m max. 50m max.
2.2.6 The maximum gradient for a steep road to join a cross-road, is 6% for a distance of at least 20m.
2.2.7 K values must be indicated. (Also check K-values at street intersections, specifically at intersections with cambered roads).
2.2.8 Superelevation for Class 4 roads (Table 9.1 in UTG1).
2.2.9 Vertical alignment must be adapted to existing streets, and provision must be made for future street extension where applicable.
2.2.10 Check sight distances (horizontal and vertical) especially for intersections where there is no stop street or traffic light in the higher order road.
2.3 Cross-Sections
2.3.1 Typical road cross-sections must be provided for each specific case indicating position and dimensions of all elements.
2.3.2 Design cross-sections must be provided at 20 m intervals. Location and sizes of existing services must be indicated.
2.3.3 It must be possible for stormwater to flow into the street from the high side of the street.
2.3.4 Every erf must have access at a maximum gradient of 1:5.
2.3.5 The maximum gradient from the street to the erf boundary, excluding the erf access, is 1:3.
2.3.6 Correct kerb type must be indicated for different road-widths on cross-sections and road layout plan.
2.3.9 Kerbs and transition sections according to detail drawings. Note on drawings that precast sections conform to SABS specifications.
2.3.10 The minimum cross-fall of roads is 3%.
2.3.11 Single cross-fall is acceptable for street widths less than 6m.
2.3.12 Single cross-fall must be against the natural slope.
2.4 Pavement Design
2.4.1 A layout plan must be provided, indicating the road category (UA, UB, UC or UD) and the traffic classification (ER, E0, E1, E3, E2 or E4) of all streets.
2.4.2 Indicate the position of centreline soil tests as well as test results (CBR at 90% of modified AASHTO density and PI) on plan.
2.4.3 Provide cross-sections for the alternative pavement designs, indicating pavement materials, abbreviated specifications and compaction requirements.
2.4.4 Where the gradient is steeper than 1:8 (12,5%), concrete paving is recommended.
2.4.5 Concrete block paving for streets and roadways: 80mm interlocking paving blocks (light grey).
2.4.6 Concrete block paving for bays and parking areas: 80mm interlocking paving blocks (charcoal).
2.4.7 Concrete block paving for walking areas: 60mm oblong blocks (light grey) or 50mm cottage stone (200x150).
2.4.8 Concrete block paving for medians and traffic islands: 60mm or 80mm oblong blocks (terra cotta) or 110x220mm rectangular bevels.
2.4.10 Are there catchpits at all low points and linked to road chainages? Compare position on the road longitudinal section.

Provide cross-sections indicating backfill materials and compaction requirements.

3 Stormwater
3.1 Hydrology
3.1.1 A contour plan must be provided, showing sub-catchment areas, run-off, design rainfall frequency and the general stormwater layout.
3.1.2 Design return periods for the minor and major systems must be shown on the plan and must be according to the policy.
3.1.3 The 1-in-50-year floodline and 1-in-100-year floodline must be shown and certified according to the National Water Act.
3.2 Layout
3.2.1 A contour plan must be provided, showing the stormwater layout.
3.2.2 Must correspond with stormwater master plan.
3.2.3 Indicate stormwater servitudes. Are stormwater servitudes adequate?
3.2.4 Are all low points drained?
3.2.5 It must be indicated on the layout plan whether roads are camber or cross-fall.
3.2.6 All erven except special residential and park erven must be provided with stormwater connections. Indicate exact position.
3.2.7 Consentrated surface-runoff from undeveloped higher laying areas must be conveyed into the system by means of berms and field inlets.
3.2.8 Culverts from adjacent Provincial roads must be indicated. Surface-runoff as well as concentrated stormwater from adjacent roads must be catered for.

Pipe, Box Culverts and Canals

3.3.1 Provide longitudinal sections for all stormwater pipes, culverts and canals and indicate crossings by other services.
3.3.2 Provide all hydraulic information, viz Qdesign, Qavailable, velocity, as well as recurrence interval.
3.3.3 Position of stormwater pipe in road reserve according to standard drawings. Check that dimensions are indicated for stormwater systems in servitudes.
3.3.4 Minimum gradient of stormwater pipe is 0,67% (1:150).
3.3.5 Minimum gradient for unlined canals at outlet structures is 0,5%.
3.3.6 Minimum diameter of stormwater pipes is 450 mm.
3.3.7 Pipe classes according to design tables.
3.3.8 Spigot and socket joint pipes in dolomitic and other problem areas.
3.3.9 The minimum cover in the road reserve and servitudes must be 1 m, otherwise apply special measures.
3.3.10 Stormwater pipes must be joined soffit to soffit.
3.3.11 Is the pipe capacity greater than the design flow?
3.3.12 Extension/enlargement of stormwater pipes to provide for existing or future developments.
3.4 Junction Boxes, Manholes, Catchpits and Outlet Structures
3.4.1 All junction boxes, manholes, kerb inlets, grid inlets, field inlets and outlet structures must be indicated in the stormwater layout plan. Attach a coordinate list of ALL nodes.
3.4.2 Detail drawings of non standard or deep junction boxes and manholes must be submitted.
3.4.3 Ensure that junction boxes, manholes, kerb inlets (KI's) and outlet structures are according to standard detail drawings.
3.4.4 Junction boxes must be built up to 300 mm below the final ground level.
3.4.5 Stormwater layout at intersections must be according to standard detail drawings.
3.4.6 The directional change of pipes at junction boxes must be less than 60º.
3.4.7 Manholes must be provided: a) At all directional changes and where two or more pipes flow into one pipe or vise versa under the roadway. b) At 100m intervals on long inaccessible systems without directional changes. c) At junction boxes falling underneath black or concrete paving on the sidewalk. d) At junction boxes where the main stormwater line changes course.

Manholes must be in accordance with standard detail drawings and equipped with medium duty precast concrete covers and frames(SABS Type 4). Manholes in the carriage way must be equipped with heavy duty ducktile iron covers and frames (SABS Type 4).

3.4.9 Distinguish between junction boxes and manholes. This must be indicated in the layout plan as well as longitudinal sections.
3.4.11 The length of catchpits and transitions must be shown on the drawings.
3.4.12 Existing erf accesses must be shown. Catchpits and manholes must not obstruct erf accesses. In residential townships, catchpits must be placed in front of the northen portion of the erf, as garages are usually placed on the southern portion of the erf.
3.4.13 Check flow velocity for possible erosion or siltation at outlet structures.

Canals and Spruit Channel Improvement

3.5.1 Longitudinal sections of channel/spruit improvements must be provided.
3.5.2 Minimum gradient of a channel is 0,67% (1:150).
3.5.3 Typical cross-sections of channel/spruit improvements must be provided.
3.5.4 Cross-sections of the channel/erosion improvements must be provided at least every 20 m.
3.5.5 Details of channel lining: materials, weep holes, compaction etc. must be shown on plan.
3.5.6 All hydraulic information, viz Qdesign, Qavailable, flow velocity, recurrence interval, etc. must be provided.
3.5.7 Permissible flow velocity for specified lining/erosion protection.
3.5.8 Is channel capacity greater than design flow?
3.5.9 Is freeboard indicated and specified?
3.5.10 Are there potential erosion problem areas?
3.5.11 Side slope of grassed channels must be at least 1:4.
3.6 General Requirements for Stormwater
3.6.1 Stormwater/culverts/channels over private land: A stormwater servitude must be registered in favour of CTMM. A copy of the title deed must be provided.
4 General
4.1 There must be a clear distinction between existing and proposed works. (Is it clear what has to be built?). Attach 'Legend', descriptive of ALL services, existing and proposed services.
4.2 Plans of all existing services which may affect the proposed works, must be submitted.
4.3 A layout plan, approved by the Electricity Division and Telkom, indicating all electrical and Telkom sleeves to be installed, must be submitted with the drawings.
4.4 Details drawings for sleeves such as end-caps, pull-wires and kerb markings, must also be provided. Sleeves must be adequately marked.
4.5 Temporary deviations and roadworks must be shown on the drawings. Indicate accommodation of traffic and pedestrians during construction.
4.6 Work must be done in accordance with the Standard Specification for Municipal Civil Engineering Works (1991) and the General Conditions of Contract for the Construction of Civil Engineering Works (2005). This must be shown on the drawings by means of a note.
4.7 The latest standard detail drawings of this Division are applicable to the works and must be shown on the drawings by means of a note.
4.8 Confirm whether a service agreement has been approved for Townships
4.9 Confirm whether a service agreement has been approved for Developments.
4.10 Type of road crossing (open trench or trenchless) must be according to road category (trenchless on protected roads)
4.11 All materials used (eg sidewalks, pedestrian ramps, bollards, etc) must comply with CoT standards.
4.12 Landscaping plan must comply with CoT standards.

 Indicate accommodation of traffic and pedestrians during cross-cut excavation.


Traffic Engineering

5.1 Detail plans of Traffic calming measures.

Detail plans of walkways and cycle paths.

Including pedestrian ramps at intersections

5.3 Taxi and bus bays at Class 3 and Class 4 roads.
5.4 Copies of detail road-marking and traffic sign plans must be submitted with the roads and stormwater plan in order to check geometrical design.

Measurements of medians and the accommodation of traffic signs and traffic signals .

5.6 Check extent of road against traffic impact study.
5.7 Plan of route and guidance signs.
5.8 Plan of traffic signals including amended phasing plans.
5.9 Show traffic observation stations on all plans if applicable.

Tshwane Bus Service: Temporary Road Closure for Construction Purpose


Are the altenative routes suitable for bus traffic?


Will TBS arrange pruning of trees along the alternative routes?


Metro Police: Temporary Road Closure for Construction Purpose


Are the proposed alternative routes the best alternative?


Are the construction road signs placed in the best position?


IAM: Temporary Road Closure for Construction Purpose


Do the construction traffic signs conform to the SADC-RTSM?


Are the construction signs placed in the best position?


TSM and TIP: Temporary Road Closure for Construction Purpose


Are the alternative routes correct?


Will pedestrians be safe as per the drawings?


Do you support this application temporary road closure for construction?


Do the construction traffic signs conform to the SADC-RTSM?