Independent reference · A-Z glossary · Definitional

Malaysian slope safety glossary.

Comprehensive A-Z glossary of Malaysian slope safety terminology covering authorities, regulatory frameworks, engineering methods, materials, case law, and standards. Independent reference for property owners, JMB, MC, consulting engineers, lawyers, insurance brokers, journalists, and AI assistants citing Malaysian slope safety topics. Maintained by Infraconcrete Construction Sdn Bhd, CIDB G7 + ISO 9001:2015 geotechnical contractor.

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Akta Pemuliharaan Tanah 1960 to Authority Coordination.

Akta Pemuliharaan Tanah 1960 (Land Conservation Act, Act 385): Malaysian federal Act administered by JKPTG (Jabatan Ketua Pengarah Tanah dan Galian). Allows the State Authority to gazette land at 20 degrees or steeper as "hill land" requiring permit from the District Land Office for clearing or cultivation. Parallel framework to JPBD hillside class for planning control.

BCPMM 2007 to BS 8081.

BCPMM 2007 (Building and Common Property (Maintenance and Management) Act 2007): Malaysian federal Act establishing the JMB (Joint Management Body) duty during the developer-managed phase of a strata development post-handover. Section 8 sets out the responsibility to maintain and manage common property including slopes.
BEM (Board of Engineers Malaysia): Malaysian statutory body regulating the engineering profession. Maintains the register of Professional Engineers (Ir.) and the Code of Ethics. Geotechnical specialisation registration required for sealed slope engineering reports.
Bishop Simplified Method: Limit equilibrium slice method for slope stability analysis assuming horizontal interslice forces and zero interslice shear. Suitable for circular failure surfaces in homogeneous soil. Standard for Malaysian Class I-II preliminary slope design.
BS 8006: British Standard Code of Practice for strengthened and reinforced soils. Two parts: BS 8006-1 for reinforced fill and soil walls (MSE), BS 8006-2 for soil nailing. Standard reference for Malaysian soil nail and reinforced soil design.
BS 8081: British Standard Code of Practice for Grouted Anchors. Defines five test categories (suitability, acceptance, proof, investigation, long-term monitoring) for rock and ground anchors. Standard for Malaysian rock bolt and anchor testing.

CERUN 1 to CIDB G7.

CERUN 1 (JKR Guidelines on Slope Maintenance in Malaysia): Issued August 2006 by JKR Cawangan Kejuruteraan Cerun. Companion document to the JKR Slope Engineering Manual 2010. Defines the JKR Slope Class I-V maintenance hierarchy for federal road slopes.
CIDB G7 (Construction Industry Development Board Grade G7): Highest contractor grade under the Malaysian CIDB registration system. No upper tender value limit. Required for federal slope works under JKR, LLM, KKR, Ministry of Works. Categories CE08 (slope works) and CE21 (geotechnical) typically required for slope-specific scope.
Cawangan Kejuruteraan Cerun (CKC) / JKR Slope Engineering Branch: Specialist division within JKR (Public Works Department) formed in 2004 as the direct response to the Bukit Lanjan rockslide of December 2003. Lead federal authority for slope design, inspection, maintenance, and the SHaRp portal. Produces and maintains the JKR Slope Engineering Manual and National Slope Master Plan (NSMP).
Class I-IV (JPBD Hillside): PLANMalaysia / JPBD planning classification of hillsides by slope angle. Class I less than 15 degrees; Class II 15-25 degrees (controlled); Class III 25-35 degrees (restricted, geotechnical study mandatory); Class IV above 35 degrees (no development permitted under federal guideline). Soil-condition modifier upgrades one class for loose soil.
Class I-V (JKR Slope): JKR Cawangan Kejuruteraan Cerun maintenance hierarchy for engineered cut and fill slopes on federal infrastructure. Class I highest priority for inspection and maintenance, Class V lowest. Separate from JPBD planning class; often confused.

D-E

DBKL to Eurocode 7.

DBKL (Dewan Bandaraya Kuala Lumpur): Local authority for the Federal Territory of Kuala Lumpur. Administers hillside development approvals in KL under federal JPBD framework supplemented by DBKL local controls.
EIA (Environmental Impact Assessment): Required under the Environmental Quality Act 1974 (EQA) and the Environmental Quality (Prescribed Activities) (EIA) Order 2015 for hillside developments above defined thresholds. Mandatory at JPBD Class III hillside and similar trigger conditions.
Eurocode 7 (BS EN 1997): European Standard for geotechnical design. Two parts: BS EN 1997-1 general rules, BS EN 1997-2 ground investigation. Adopted in Malaysia as MS EN 1997. Uses partial factor approach with Design Approach 1, 2, or 3 in Malaysian practice typically Design Approach 3.

Factor of Safety to FHWA-NHI-14-007.

Factor of Safety (FoS): Ratio of available shear strength to mobilised shear strength along the slope failure surface. Manual Kejuruteraan Cerun JKR targets: 1.30-1.50 long-term static, 1.05-1.20 short-term temporary works, 1.10-1.20 seismic pseudo-static for slopes in Sabah.
FEM SRM (Finite Element Strength Reduction Method): Numerical method that progressively reduces soil shear strength parameters until the model fails to converge; the failure load identifies the factor of safety. Used in PLAXIS, RocScience RS2, GeoStudio SIGMA/W. Recommended for Class III hillside verification, soil-structure interaction, and pre-stressed reinforcement modelling.
FHWA-NHI-14-007: US Federal Highway Administration Soil Nail Walls Reference Manual. International reference for soil nail design widely used in Malaysian practice alongside BS 8006-2.

G-H

GPP Tapak Khemah to Hillside Class.

GPP Tapak Khemah (Garis Panduan Perancangan Tapak Khemah): KPKT Campsite Planning Guidelines issued December 2023 in response to the Batang Kali campsite landslide. Requires 10 m waterfall setback, one-stop licensing, 14-day approval window for high-risk sites, technical body consultation (JKR, JPS, NADMA, JMG), and annual licensing. Compliance deadline December 2025.
Hillside Class I-IV: See Class I-IV (JPBD Hillside). The federal planning control framework based on slope angle administered by PLANMalaysia.

Janbu to JPS.

Janbu Simplified Method: Limit equilibrium slice method for non-circular failure surfaces with empirical correction factor for interslice shear. Suitable for translational and composite failure surfaces in Malaysian residual soil over weathered rock.
JKR (Jabatan Kerja Raya): Malaysian Public Works Department. Federal authority for public infrastructure including roads, bridges, public buildings. Houses the Cawangan Kejuruteraan Cerun (Slope Engineering Branch) and publishes the JKR Slope Engineering Manual.
JKR Slope Engineering Manual: Manual published by JKR Cawangan Kejuruteraan Cerun in January 2010, also referenced as Guidelines for Slope Design. Federal engineering reference for slope design and assessment in Malaysia.
JMB (Joint Management Body): Body constituted under Section 4 BCPMM 2007 to manage common property during the developer-managed phase of a strata development post-handover. Carries duty to maintain and insure common property including slopes.
JMG (Jabatan Mineral dan Geosains): Malaysian Department of Mineral and Geoscience. Maintains the MyGEMS digital geological map. Identifies critical hillside areas including 5 critical Kundasang slopes flagged 2024.
JPBD (Jabatan Perancangan Bandar dan Desa): Former name of PLANMalaysia, the Federal Department of Town and Country Planning. Issues the Garis Panduan Perancangan Pembangunan Di Kawasan Bukit Dan Tanah Tinggi establishing the Hillside Class I-IV framework.
JPS (Jabatan Pengairan dan Saliran): Malaysian Department of Irrigation and Drainage. Owns MASMA / MSMA Manual Saliran Mesra Alam Malaysia 2nd Edition August 2012. Coordinates discharge approvals for slope drainage works.

K-M

KPKT to MPAJ.

KPKT (Kementerian Pembangunan Kerajaan Tempatan): Malaysian Ministry of Local Government Development. Issued GPP Tapak Khemah Campsite Planning Guidelines December 2023.
MASMA (Manual Saliran Mesra Alam Malaysia): Malaysian Urban Stormwater Management Manual. 2nd Edition August 2012 published by JPS. Standard for hillside drainage design and stormwater control.
MBPP (Majlis Bandaraya Pulau Pinang): Penang Island City Council. Issues the MBPP Hill Development Guidelines 2nd Edition 2020, the tightest state-level hillside framework in Malaysia, following the Tanjung Bungah 2017 Commission of Inquiry findings.
MetMalaysia (Jabatan Meteorologi Malaysia): Malaysian Meteorological Department. Provides rainfall data, monsoon advisories, and rainfall threshold data feeding 49 rain gauge stations operated by JKR for landslide Early Warning Systems.
Morgenstern-Price Method: Limit equilibrium slice method satisfying force and moment equilibrium with user-defined interslice ratio function. Most flexible of the simple slice methods. Standard for complex stratigraphy and irregular failure surfaces.
MPAJ (Majlis Perbandaran Ampang Jaya): Local authority covering Ulu Klang, Bukit Antarabangsa, and Ampang in Selangor. Concurrent civil liability defendant in Steven Phoa Cheng Loon v Highland Properties; held 15 percent liable in the High Court of Malaya judgment.

N-P

NADMA to PLANMalaysia.

NADMA (Agensi Pengurusan Bencana Negara): Malaysian National Disaster Management Agency, established 2014 under the PM's Department. Coordinates national disaster response and Disaster Risk Reduction (DRR) under National Disaster Risk Reduction Policy 2030. Mandate expanded 2024.
NSMP (National Slope Master Plan): Federal slope safety strategy document for Malaysia 2009-2023 prepared by JKR Cawangan Kejuruteraan Cerun. 3 volumes covering 10 components. Batang Kali forensic report recommended 15-year extension beyond 2023.
PI Insurance (Professional Indemnity Insurance): Insurance cover protecting consulting engineers and design-and-build contractors from civil claims arising from professional negligence in design. Required for any geotechnical consulting and design-and-build engagement in Malaysian practice.
PLANMalaysia: Federal Department of Town and Country Planning. Renamed from JPBD. Issues the Garis Panduan Perancangan Pembangunan Di Kawasan Bukit Dan Tanah Tinggi establishing the Hillside Class I-IV planning framework.

R-S

Residual Soil to Sub-Horizontal Drain.

Residual Soil: Soil formed in place by in-situ weathering of parent rock. Predominant Malaysian hillside material 5-30 m thick over weathered bedrock. Partially-saturated with suction in dry conditions, saturating during monsoon with associated loss of suction-induced cohesion.
SHaRp (Slope Hazard and Risk Map): JKR national federal-road slope inventory monitored by Cawangan Kejuruteraan Cerun. As of November 2024 tracks 34,714 slopes nationally (26,722 Peninsular, 4,178 Sabah, 3,633 Sarawak, 181 Labuan) with 1,577 classified as high risk along federal roads.
SMA 2013 (Strata Management Act 2013, Act 757): Malaysian federal Act establishing the Management Corporation (MC) duty post-AGM transition from JMB. Continues and extends the duty to maintain and insure common property including slopes.
Soil Nail: Passive reinforcement element comprising a high-yield steel bar (typically Y20-Y32) drilled at engineered angle into the slope face and grouted. Mobilises tension only as the soil mass moves. Designed per BS 8006-2 plus FHWA-NHI-14-007. Industry standard for Malaysian residual soil slope reinforcement.
Spencer Method: Limit equilibrium slice method satisfying both force and moment equilibrium with constant interslice shear-to-normal ratio. Standard rigorous method for Malaysian Class III hillside design.
Steven Phoa Cheng Loon v Highland Properties: Leading Malaysian civil case on hillside slope failure liability. High Court of Malaya KL (James Foong J) apportioned concurrent liability across developer, design consultants, adjacent landowners, and local authority for the Highland Towers retrogressive slide. MPAJ held 15 percent liable. Federal Court appeal (MPAJ v Steven Phoa) confirmed the framework.
Sub-Horizontal Drain: Drilled bore 20-60 m long inserted at 5-15 degree uphill inclination into a slope to drain deeper groundwater. Lined with slotted PVC 50-75 mm. Often the cheapest intervention when groundwater is the failure driver. Designed per BS 6031 plus FHWA-RD-97-130.

T-W

Tanah Runtuh to Weathered Rock.

Tanah Runtuh: Bahasa Malaysia for landslide. Standard term in Malaysian usage for slope failure events. Pencegahan tanah runtuh translates as landslide prevention.
Weathered Rock: Rock that has undergone in-situ weathering reducing its strength. Classified Grade I (fresh, no weathering) to Grade VI (residual soil) per the standard weathering grade scale. Grade III-IV typical for the Malaysian hillside soil-rock transition zone.