Measures proposed to achieve economy in the Construction of rural roads under the PMGSY

MORD 22 - Introduction: Key Specifications & Tables

1. Road Classification & Dimensions (IRC:SP:20 / IRC:SP:48)

2. Horizontal Curve Radii

Existing roads tolerances accepted unless safety issues arise.

3. Longitudinal Gradients (excluding hairpin bends)

*Exceptional gradient length ≤ 100 m, separated by ≥ 100 m of ruling or flatter gradient.

4. Hairpin Bends

• Minimum design speed: 20 km/h
• Minimum roadway: 7.5 m (ODR), 6.5 m (VR)
• Minimum inner curve radius: 14 m
• Minimum central curve radius: 12 m
• Minimum transition curve length: 15 m

Summary Diagram of Key Geometric Parameters

graph LR
A[Road Type]
A --> B[Through Roads]
A --> C[Link Roads]

B --> D[Carriageway Width: 3.75 m]
C --> E[Carriageway Width: 3.0 m or 3.75

Key Specifications & Formulas for Pavement Design (MORD 22 / IRC: SP: 72-2015)

1. Design Parameters for Flexible Pavement:

• Design Period: Selected based on road function and expected life.
• Subgrade Strength:
  • Minimum design CBR = 5% for rural roads.
  • If CBR < 5%, soil stabilization is mandatory to improve strength.
  • Use average annual rainfall, local ponding, flooding for moisture condition assessment (not always 4-day soaked CBR).
• Traffic Estimation:
  • For habitations < 500 population, max traffic = 100,000 ESAL (Equivalent Standard Axle Loads), Traffic Category T3.
  • Justify deviations if traffic exceeds this.

2. Subgrade Strength Assessment:

3. Traffic Estimation:

• Use IRC guidelines for traffic estimation.
• ESAL = Equivalent Standard Axle Load, key for pavement thickness design.

Summary

flowchart TD
    A[Start Pavement Design] --> B{Select Design Period}
    B --> C[Assess Subgrade Strength]
    C --> D{Is CBR ≥ 5%?}
    D -- Yes --> E[Proceed with Design]
    D -- No --> F[Stabilize Subgrade Soil]
    F --> E
    E --> G[Estimate Traffic (ESAL)]
    G --> H{Traffic ≤ 100,000 ESAL?}
    H -- Yes --> I[Finalize Pavement Thickness]
    H -- No --> J[Justify & Adjust Design]

**Refer to IRC: SP

Key Geometric Design Specifications (As per IRC:SP:20 & IRC:SP:48)

Important Formulas:

• Superelevation (e):
  [ e = \frac{V^2}{127R} ] Where:

  • (V) = design speed (km/h)
  • (R) = radius of curve (m)
  • (e) = superelevation (max 10%)

• Transition Curve Length (L):
  Minimum 15 m or as per design speed and curvature change.

Summary Diagram of Curve Elements:

flowchart LR
    A[Straight Road] --> B[Transition Curve (15m min)]
    B --> C[Horizontal Curve (Radius R)]
    C --> D[Transition Curve (15m min)]
    D --> E[Stra

Maximising Use of Locally Available Marginal Materials & Industrial Wastes (MORD 22)

Key Specifications:

• Maximum lead distance for carriage of road aggregates (except bitumen, emulsion, cement, steel):
  50 km to promote use of local materials.

• Material Compliance:
  Must meet gradation, plasticity, strength, and density criteria per road construction specs.

• Compaction:
  For some marginal materials, compaction to refusal is mandatory to improve performance.

• Test Track Studies:
  Essential to validate stabilized marginal materials for different pavement layers.

• Use of Stone Chips for Bitumen Surfaces:
  Lead beyond 50 km allowed if certified no suitable local stone chips exist.

• Environmental Safety:
  Characterization for heavy metals, leachate analysis, and non-hazardous certification is mandatory.

Recommended Process Flow for Utilization

flowchart TD
    A[Identify Local Marginal Materials] --> B[Characterize Physical & Engineering Properties]
    B --> C[Evaluate Environmental Safety]
    C --> D{Meets Specifications?}
    D -- Yes --> E[Conduct Test Track Studies]
    E --> F{Performance Acceptable?}
    F -- Yes --> G[Approval by State Road Agencies]
    G --> H[Use in Road Construction]
    D -- No --> I[Stabilization & Re-evaluation]
    F -- No --> J[Reject or Further Treatment]

Summary Table: Lead Distance & Material Use

References:

• Clause 4.2, 4.3, 4.4 of MORD 22
• Environmental characterization for industrial wastes (heavy metals, leachate)
• Compaction to refusal for marginal materials

This approach balances sustainability, cost-effectiveness, and safety in road construction.

Special Engineering Measures in Hill Areas (MoRD 22)

Key Points from Clause 5.5:

• Problem: Side slopes in hill roads are vulnerable to landslides and slips, especially during monsoons.
• Solutions:
  • Stone pitching: Protects slopes by providing a stable rock cover.
  • Bio-engineering: Use of vegetation to stabilize soil and reduce erosion.
  • Both should be combined with engineering stabilization (e.g., retaining walls, drainage).

Reference:

• MoRD Specifications Clause 1612 (2014) provides detailed guidelines on slope protection.

Typical Specifications & Formulas:

Bio-engineering Techniques:

• Live staking: Planting cuttings of suitable species.
• Brush layering: Layers of branches in soil.
• Vegetative geogrids: Combining soil reinforcement with plants.

flowchart TD
    A[Hill Road Side Slopes] --> B[Risk: Landslides & Slips]
    B --> C[Engineering Measures]
    B --> D[Stone Pitching]
    B --> E[Bio-engineering]
    C --> F[Retaining Walls]
    C --> G[Drainage Systems]
    E --> H[Live Staking]
    E --> I[Brush Layering]

Summary: Use stone pitching + bio-engineering + proper drainage and retaining structures per MoRD 1612 for slope stability in hill areas. This integrated approach reduces landslide risk and maintenance costs.

Special Engineering Measures in Flood Prone Areas (MORD 22)

Key Recommendations (Clause 6.1):

• Alignment: Prefer higher contours to avoid flooding.
• Compaction:
  • Embankment: 95% MDD (Heavy compaction, IS:2720-Part 8)
  • Sub-grade: 97% MDD
• Pavement:
  • Use Interlocked Cement Concrete Block Pavement (ICCBP), panelled concrete pavement in overtopping zones for easy repair.
  • Elsewhere, select pavement based on cost.
• Shoulders: Use brick paving, quarry rubbish, or stone set pavement, depending on local materials.
• Waterways: Provide adequate balancing culverts in flat areas.
• Causeways & Submersible Bridges: Use CC pavement on submerged portions; design as per IRC SP 13 and IRC SP 82.

Retaining/Breast Walls (Clause 5.6):

• Promote gabions for economy and site adaptability.
• Dry masonry for walls ≤ 3 m;
• Cement mortar bonded masonry for 3–6 m;
• Stone masonry in RR 1:5 beyond 6 m height.
• Refer Annexure H for gabion cost-benefit.

Compaction Standards (IS:2720-Part 8)

Pavement Types for Flood Prone Areas

flowchart TD
    A[Flood Prone Area] --> B{Alignment}
    B -->|Higher Contour| C[Preferred]
    B -->|Low Contour| D[Risk of Flooding]
    D --> E[Heavy Compaction]
    E --> F[Embankment 95% MDD]
    E --> G[Sub-grade 97% MDD]
    F & G --> H[Pavement Selection

Key Specifications & Formulas for Bridges, Culverts, and Side Drains (MORD 22 & IRC Guidelines)

1. Design Guidelines

• For bridges >30m length, follow IRC SP:13 (Design of Small Bridges and Culverts).
• Number of cross-drainage structures depends on road location and catchment characteristics.

2. Minimum Dimensions

• Road Width (including parapet & drain):
  • Through Roads & Link Roads: 6.0 m (Clause 6.0)

3. Horizontal Curves (IRC SP:20 / SP:48)

• Existing roads may accept absolute minimum radius unless safety issues arise.
• Provide cautionary signposts where minimums are used.

4. Longitudinal Gradients

*Exceptional gradient length ≤ 100m, separated by ≥ 100m of ruling or flatter gradient.

5. Hairpin Bends

• Minimum design speed: 20 km/h
• Minimum roadway width:
  • ODR: 7.5 m
  • VR: 6.5 m
• Minimum inner curve radius: 14 m (12 m at centerline for existing roads)
• Minimum transition curve length: 15 m

Summary Table: Minimum Radii and Gradients

| Feature          | Value                  |
|------------------|------------------------|
| Min Road Width   | 6.0 m (including drain) |
| Min Radius (Through Roads) | 30m (mountainous) / 33m (snow) |
| Min Radius

Protection Works: Key Formulas & Specifications (MORD 22)

1. Drain Cross-Section (Clause 7.11):

• Bed width & height typically 450 mm x 450 mm.
• At start point, depth can be halved (225 mm) to reduce cost by ~10%.
• Use self-cleansing shapes: semi-circular, N-type, or V-type for efficiency and low maintenance.
• Provide at least two cross-sections: start and outfall points for cost and hydraulic efficiency.

2. Splayed Wing Wall & Return Wall Volume (Clause 1.5):

• E = Embankment height (m)
• Average volumes:
  • Splayed Wing Wall ≈ 4.82 m³
  • Return Wall ≈ 9.02 m³

3. Semicircular Arch Culvert (Clause 60.6):

• Suitable for 3 m water flow; covers 80% of streams with flood depth < 3m.
• Arch radius: 1.0 m, thickness: 15 cm (M15 concrete).
• Supported on raft foundation with dwarf pier (1.5 m height).
• Fast, cost-effective, and adaptable for varied flood depths.

4. RCC Wearing Course & Guard Stones:

• RCC Wearing course thickness: 7.5 cm
• Guard stone size: **25 cm × 25 cm

Creating Hygienic Conditions & Sustained Performance at Village Entries (MORD 22)

Key Points from IS Code:

• Clause 9.3: Holistic planning integrating rural roads with sanitation and waste management is essential.
• Clause 13.5: Community awareness & participation in solid waste, cattle dung, and wastewater disposal are critical.
• Clause 8.4: Proper design can reduce protection work, lowering costs.

Specifications & Measures:

• Drainage Design:

  • Provide adequate side drains to prevent water stagnation.
  • Use cross-drainage structures sized per runoff calculations (Q = CiA).

• Solid Waste Management:

  • Design designated disposal pits away from roads.
  • Promote composting of cattle dung.

• Wastewater Disposal:

  • Ensure soak pits or septic tanks are located beyond road influence zones.

• Road Cross-Section:

  • Minimum carriageway width: 3.5 m (typical for rural roads).
  • Side slopes: 1:2 or flatter for stability and cleanliness.

Formula for Runoff (for Drainage Design):

[ Q = C \times i \times A ]

• Q: Peak runoff (m³/s)
• C: Runoff coefficient (0.3–0.7 for rural areas)
• i: Rainfall intensity (m/s)
• A: Catchment area (m²)

Summary Diagram:

flowchart LR
    A[Holistic Planning] --> B[Road Design]
    A --> C[Sanitation & Waste Management]
    A --> D[Community Awareness]
    B --> E[Drainage & Protection]
    C --> F[Waste Disposal Facilities]
    D --> G[Participation in Maintenance]
    E & F & G --> H[Sustained Performance & Hygienic Conditions]

In brief: Integrate road design with sanitation, drainage, and community involvement to ensure hygiene and durability at village entries, reducing maintenance and costs.

Timely and Adequate Maintenance (Clause 10, Page 21)

Key Points:

• Objective: Ensure roads remain durable and serviceable, reducing life-cycle costs.
• Principle: Well-engineered roads require less frequent maintenance but timely interventions prevent deterioration.
• Support: Strengthen oversight by STAs, NQMs, SQMs, and NRRDA for effective maintenance management.

Maintenance Specifications:

• Routine Maintenance: Regular activities like pothole patching, clearing drains, and shoulder repairs.
• Periodic Maintenance: Resurfacing, sealing cracks, and strengthening overlays before major distress.
• Preventive Maintenance: Early treatments such as seal coats to extend pavement life.

Typical Maintenance Intervals:

Formula for Maintenance Planning:

• Pavement Service Life Extension:

[ L = L_0 + \sum (t_i \times E_i) ]

Where:

• (L) = extended life of pavement
• (L_0) = original design life
• (t_i) = time after ith maintenance
• (E_i) = effectiveness factor of ith maintenance (0 < (E_i) ≤ 1)

flowchart TD
    A[Well-Engineered Road] --> B[Reduced Maintenance Burden]
    B --> C[Timely Routine Maintenance]
    B --> D[Periodic Maintenance]
    B --> E[Preventive Maintenance]
    C --> F[Drain Cleaning, Pothole Patching]
    D --> G[Resurfacing, Crack Sealing]
    E --> H[Seal Coats, Early Repairs]
    F & G & H --> I[Extended Pavement Life & Performance]

Summary:
Timely and adequate maintenance, supported by technical oversight, ensures durability and cost efficiency of roads. Regular inspections and scheduled interventions extend pavement life significantly.

Knowledge & Technology Development for Resource Efficiency (MORD 22 - Clause 11)

This section emphasizes enhancing resource efficiency in rural road construction focusing on cost, durability, and environmental impact.

Key Resource Efficiency Indicators:

• Reduction in pavement cost
• Improved traveler safety & riding comfort
• High functional pavement performance
• Minimum physical resource consumption
• Minimum vegetation loss
• Energy-efficient construction operations

Thrust Research Areas (Box 1):

1. Effective drainage design for pavement longevity.
2. Recycling granular materials in full/partial depth.
3. Use of warm mix asphalt and porous pavements.
4. New specifications & quality control for emerging tech.
5. Accelerated bridge construction methods.
6. Subgrade & sub-base treatments for marginal materials.
7. Use of industrial wastes & sea shells in coastal roads.
8. Bioengineering for slope protection in hilly terrain.
9. Pavement performance prediction models.
10. Low-cost thin bituminous surfacing.
11. Cost-effective cross drainage structures.
12. Traffic assessment tailored for rural roads.
13. Geo-textile applications in rural roads.

Practical Specifications:

• Drainage design: Ensure subgrade and pavement layers have adequate drainage to prevent water retention.
• Material reuse: Incorporate recycled aggregates and industrial by-products to reduce virgin material use.
• Energy efficiency: Use warm mix asphalt to lower production temperatures and energy consumption.

Example: Pavement Cost Reduction Formula (Simplified)

[ \text{Total Pavement Cost} = \sum \left( \text{Material Cost} + \text{Construction Cost} + \text{Maintenance Cost} \right) ]

Optimizing each term by recycling, efficient design, and maintenance reduces overall cost.

flowchart LR
    A[Resource Efficiency] --> B[Cost Reduction]
    A --> C[Material Reuse]
    A --> D[Energy Efficiency]
    A --> E[Improved Pavement Performance]
    B --> F[Lower Construction & Maintenance Cost]
    C --> G[Use of Industrial Waste & Recycled Materials]
    D --> H[Warm Mix Asphalt & Efficient Equipment]
    E --> I[Effective Drainage & Bioengineering]

Summary: Focus on innovative materials, drainage, and construction technologies to improve rural road sustainability and reduce lifecycle costs per MORD guidelines.

Awareness Raising among Quarry and Mine Owners (MoRD Code MORD 22, Clause 12)

Key Points:

• Objective: Educate quarry/mine owners on proper disposal and utilization of marginal materials.
• Materials Concerned: Overburden waste, low-grade ore, tunneling muck, dredged material.
• Best Practice:
  • Avoid mixing rock-based waste with soil as it degrades material quality.
  • Store by-products carefully to enable their use in road construction (sub-base, base course).
  • Coordinate with Mining and Environment Ministries to allow reuse of overburden for road works.
  • Use soil or municipal waste for mine refilling instead of valuable rock-based materials.

Specifications:

Coordination:

• Engage Departments of Mining, Environment & Forests for policy support.
• Promote R&D budget allocation (0.2% of annual budget) for rural road materials research (Clause 11.9).

Summary Diagram:

flowchart TD
    A[Quarry/Mine Owners] --> B[Proper Storage of By-products]
    B --> C[Use in Road Construction]
    B --> D[Avoid Mixing with Soil]
    D --> E[Preserve Material Quality]
    C --> F[Sub-base/Base Course]
    A --> G[Coordination with Mining & Environment Ministries]
    G --> H[Policy Support for Material Reuse]

Note: No direct formulas or tables exist for awareness raising, but the focus is on material handling and inter-agency coordination as per MoRD guidelines.

Awareness Raising Among Community (IS Code: MORD 22, Clause 13)

Key Points:

• Objective: Promote community participation in proper disposal of solid waste, cattle dung, and wastewater.
• Goal: Create hygienic and aesthetic conditions along rural roads.
• Approach: Integrate awareness campaigns with holistic rural development planning.

Specifications & Guidelines:

Recommended Awareness Activities:

• Educational campaigns on environmental health.
• Demonstrations of proper waste segregation and disposal.
• Involvement of local leaders in messaging.
• Use of visual aids and local language materials.

Summary Diagram:

flowchart LR
    A[Community Awareness] --> B[Proper Solid Waste Disposal]
    A --> C[Cattle Dung Management]
    A --> D[Wastewater Disposal]
    B & C & D --> E[Hygienic & Aesthetic Rural Roads]
    E --> F[Community Participation in Rural Development]

Note: The code emphasizes community engagement as a vital part of sustainable rural infrastructure maintenance, but does not provide explicit formulas or tables for awareness raising. Use participatory rural appraisal tools and local surveys to tailor programs effectively.

General Measures - Key Specifications & Tables (MORD 22)

1. Oversight & Support

• Implementation requires support from:
  • State Technical Agencies (STAs)
  • National Quality Monitors (NQMs)
  • State Quality Monitors (SQMs)
• Strengthening NRRDA for proper oversight is essential (Clause 1.7).

2. Geometric Design Parameters (IRC:SP:20 / IRC:SP:48)

3. Notes:

• Carriageway width can reduce to 3.0 m for traffic < 100 motorized vehicles/day.
• Wider roadway recommended on curves and where land use demands.
• Passing places mandatory if formation width ≤ 5 m on link roads.

Summary Diagram of Geometric Design Parameters

graph TD
  A[Road Classification] --> B[Through Roads]
  A --> C[Link Roads]
  B --> D{Carriageway Width}
  C --> E{Carriageway Width}
  D -->|New| F[3.75 m]
  D -->|Existing| G[≥3.0 m acceptable]
  E -->|New| H[3.00 m (<100 vehicles/day)]
  E -->|New| I[

Strengthening of NRRDA - Key Points from MORD 22

1. Oversight & Support (Clause 1.7):

   • Strengthen NRRDA with support from STAs, NQMs, SQMs for effective implementation and oversight.

2. Pavement Design (Clause 2.5 & IRC:SP:72-2015):

   • Design Parameters:

     • Design period selection
     • Subgrade strength assessment
     • Traffic estimation

   • Subgrade Strength:

     • Minimum CBR = 5% for all rural roads
     • If CBR < 5%, stabilize subgrade soil to improve strength ≥ 5%
     • Moisture conditioning based on local rainfall/flooding, not always 4-day soaked CBR test

   • Traffic Estimation:

     • Use IRC guidelines strictly
     • For villages < 500 population, design traffic ≤ 100,000 ESAL (Traffic category T3) unless justified otherwise

3. Schedule of Rates (Clause 14.5):

   • Rates based on recent awarded works and IRC Standard Data Book

Summary Table: Subgrade CBR & Traffic Design

flowchart TD
    A[Strengthening NRRDA] --> B[Support from STAs, NQMs, SQMs]
    A --> C[Pavement Design]
    C --> D[Design Period Selection]
    C --> E[Subgrade Strength Assessment]
    E --> F{CBR < 5%?}
    F -- Yes --> G[Subgrade Stabilization]
    F -- No --> H[Proceed with Design]
    C --> I[Traffic Estimation]
    I --> J{Population < 500?}
    J -- Yes --> K[Design for ≤ 100,000 ESAL]
    J -- No --> L[Follow full IRC guidelines]

This concise framework ensures effective strengthening and design oversight for NRRDA rural roads per MORD

Additional Support from STAs, NQMs, and SQMs (MORD 22)

• Purpose: Ensure quality and economy in project DPRs through ground verification and oversight.

• Key Roles:

  • STAs: Provide technical support; may delegate ground verification to SQMs if site visit is difficult.
  • SQMs: Deputed by SRRDAs for sample ground verification of DPRs before submission to NRRDA.
  • NQMs: Conduct ground verification before sanctioning proposals; focus on quality monitoring.

• Verification Focus Areas:

  • Excess provision of Cross Drainage (CD) works
  • Protection works and CC drains
  • CC pavements
  • Traffic estimation accuracy
  • CBR (California Bearing Ratio) reporting
  • Existing crust thickness in upgradation works
  • Correct selection of proposed works

• Coordination: State Quality Cell (SQC) coordinates verification on PIU request.

• Honorarium: Paid as per current NRRDA norms.

Summary Table

flowchart LR
    PIU -->|Request verification| SQC
    SQC -->|Coordinates| STA
    STA -->|Delegates if needed| SQM
    SQM -->|Ground verification report| SRRDA
    SRRDA -->|Submit DPR| NRRDA
    NRRDA -->|Verification| NQM
    NQM -->|Final sanction recommendation| NRRDA

This structured support ensures DPR accuracy, cost-effectiveness, and quality compliance in rural road projects.

Capacity Building and Training (MORD 22, Clause 17)

The code emphasizes structured training programs for stakeholders like STAs (State Technical Agencies), PIUs (Project Implementation Units), Contractors, and Quality Monitors (NQMs, SQMs) to enhance skills in rural road construction and monitoring.

Key Points:

• Training on Rural Roads Manual IRC SP:20:2002 with modifications, especially for CD (Cross Drainage) structures.
• Ground verification techniques for DPRs (Detailed Project Reports) to identify design and cost aberrations.
• Coordination between STAs, PIUs, SQMs, and NQMs for quality assurance.
• Honorarium norms for NQMs/SQMs involved in training and verification tasks.

Recommended Training Topics:

• Design and construction of CD structures.
• Quality monitoring and ground verification of DPRs.
• Use of local materials and industrial wastes.
• Maintenance and protection works.
• Data reporting and evaluation techniques.

Sample Table: Training Stakeholders and Focus Areas

flowchart LR
    A[Capacity Building] --> B[STAs Training]
    A --> C[PIUs Training]
    A --> D[Contractors Training]
    A --> E[NQMs/SQMs Training]
    B --> F{Focus: CD Structures, DPR Verification}
    C --> G{Focus: Project Management, DPR Preparation}
    D --> H{Focus: Construction Techniques}
    E --> I{Focus: Quality Monitoring, Verification}

Summary: Capacity building ensures technical competence, quality assurance, and cost-effective rural road infrastructure through targeted training and ground verification protocols.

Summary of Key Recommendations from MORD 22 (Clause 18)

Geometric Design:

• Carriageway width:
  • Through Roads: 3.75 m
  • Link Roads: 3.00 m (If traffic >100 motorized vehicles/day, increase to 3.75 m)
• Roadway width:
  • Through Roads: 7.5 m
  • Link Roads: 6.0 m (can be 7.5 m if warranted by land use or traffic)
• Minimum length of transition curve: 15 m
• Gradient: Max 2.5% (1 in 40), Min 0.5% (1 in 200)
• Maximum superelevation: 10%

Pavement Design:

• Follow IRC SP:72-2015 for low volume rural roads (new and upgradation).
• Promote gravel roads for traffic up to:
  • 150 vehicles/day (rainfall < 500 mm)
  • 50 vehicles/day (rainfall < 1000 mm)
• Use recycled granular materials for upgrades.
• Cement concrete roads (e.g., flood-prone areas) should use cell filled concrete, ICBP, or panelled CC roads.

Quality Control & Monitoring:

• PIUs and Consultants’ DPRs must be test-checked by STA.
• STA site visits for abnormal costs, excess provisions, high traffic projections, or embankment height ≥ 1 m.

Quick Reference Table: Geometric Parameters