esc manual for sabah & sarawaj - msowater.org.mymsowater.org.my/laravel-filemanager/files/1/swam...
TRANSCRIPT
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ESC MANUAL FOR SABAH & SARAWAK
IR AZMAN ABU BAKAR
(PAOR)
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PROBLEMS…PROBLEMS…
Erosion only a few feetfrom the kitchen of theirlonghouses, on the banksof Baleh River, Kapit.
River silted by erosion due to deforestation for oil palm plantations, Niah National Park, Sarawak, Malaysia.
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…….AND MORE PROBLEMS
A 5.9-magnitude earthquakehas caused soil erosion androckfall in at least two rivers,while heavy mudflow hasaffected water supply in theKota Belud and Ranau districts.
Developer Victor Paul wasreported telling thatTanjung Aru beach haseroded 50 meters in the last40 years during the 5thSabah InternationalSurveyors'.
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Issues• At the moment, there is no specific ESC
guidelines/manual for Sabah & Sarawak.
• There are however, motley collections ofresearch papers/studies/journals beenpublished by respective researchers – but theydo not transcend to engineering practitionersand others who are involved in ESC practices.
• The existing Guideline for Erosion & SedimentControl in Malaysia 2010 should be used as aprecursor to develop the guideline for Sabah& Sarawak.
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Some examples of research papers
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Issues (2)
• To ease the calculation of USLE and MUSLE, these factors need to be pre-determined
a. Rainfall erosivity factor, R
b. Soil erodibility factor, K
c. Slope length and steepness factor, LS
d. Cover management and erosion control practice factors, C and P.
e. Curve number, CN and surface runoff, V
f. Peak discharge, Qp
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Issues (3)
• Among the many factors, computation of R factors appeared to be the most complicated due to the rainfall data requirement
• There is a set of complete isoerodent maps for Peninsular Malaysia, but none for Sabah & Sarawak.
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Isoerodent map, R factor for Peninsular Malaysia
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Isoerodent map, R factor for Johor
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What’s happening in Sabah & Sarawak?
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Issues (4)
• Soil erodibility factor, K in Peninsular Malaysia:
K Factor
0
0.003
0.004
0.005
0.006
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What’s happening in Sabah & Sarawak?
• There are soil maps available (ANCIENT) butno soil erodibility factors for the variable localsoil series.
• Level 4 Sanitary Landfill construction sitelocated in Sibu, Sarawak case study :
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Issues (5)
• Slope length and steepness factor, LS
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Issues (6)
• Crop management, C factor and Erosion controlPractice, P factor.
• Values of commonly found C related to Malaysianconditions are provided in Tables 3.6 to 3.8.
• P values for common support practices found inMalaysia in given in Table 3.9.
• It should be noted that the C and P factors beingsuggested are of typical values under averagerunoff condition, and therefore, it should be usedwith extra caution for other surface and runoffconditions.
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Issues (7)
• For runoff estimation, the Curve Number method, CN developed by US National Resources Conservation Services (NRCS) is widely used.
• Initially developed primarily for agricultural land use, although it has been extended to other land-use types.
• The surface runoff volume, V can then be calculated by multiplying the runoff depth with the area involved.
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Issues (8)
• Peak discharge, Qp - MSMA recommendedthe Rational Method (for small catchmentonly) and Time Area Method for peakdischarge estimation in Malaysia.
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USLE/RUSLE/MUSLE CALCULATION:
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In summary,
• It could and would be a daunting task forengineers and others ESC practitioners inSabah & Sarawak involved in smaller-scaleprojects to prepare their plans without thehelp of a basic guideline, with manypredetermined values.
• The unavailability of such guideline couldimpact best management practices atconstruction/agricultural sites etc, resulting tounnecessary soil loss and sediment yieldwhich could deteriorate surroundingenvironment, especially water resources.
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Chapter 1: INTRODUCTION
1.0 Background.
1.1 Local experience with construction sites.
1.2 Necessity of the guideline.
1.3 Objective of the guideline.
1.4 Usage of the guideline.
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Chapter 2: RULES & REGULATIONS
2.1 Introduction.2.2 Federal and state regulations.
a. The Federal Constitution of Malaysian.b. Government policies.c. Environmental quality and control.d. Land.e. Forestry.f. Mining.g. Quarries.h. River and streams.i. Town planning.j. Fisheries.
2.3 Enforcement and penalties.
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Chapter 3: SOIL EROSION & SEDIMENTATION
3.1 Soil erosion and sedimentation processes.a. Rainsplash erosion.
b. Sheet erosion.
c. Rill erosion.
d. Gully erosion.
e. Riverbank erosion.
f. Tunnel erosion.
g. Wind erosion.
3.2 Soil loss and sediment yield estimation.a. USLE
b. MUSLE
3.3 Soil loss and sediment yield parameters.a. Rainfall erosivity factor, R
b. Soil erodibility factor, K
c. Slope length and steepness factor, LS
d. Cover management and erosion control practice factors, C and P.
e. Curve number, CN and surface runoff, V
f. Peak discharge, Qp
3.4 Summary
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Chapter 4: EROSION & SEDIMENT CONTROL PLAN
4.1 Introduction.4.2 Submission requirements for construction activity.
a. Who should obtain approval?b. Deadlinesc. Compliance with other plans.d. Minimum requirements of ESCP.
4.3 Generic guidelines for ESCP.a. Minimizing soil erosion.b. Preserving top soil and other assets.c. Access routes and site managements.d. Drainage control and runoff management.e. Earthwork and erosion control.f. Sediment prevention and control.g. Slope stabilizationh. Site maintenance.
4.4 Plan preparation stages.4.5 Inspection and maintenance.4.6 Content of ESCP.
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Chapter 5: EROSION & SEDIMENT CONTROL FACILITIES
5.1 Introduction.
For best management practice at the site during earthwork, an effective erosion and sediment control is done through three lines of defense:
1. Soil stabilization and revegetation
2. Runoff control and diversion
3. Sediment basin
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Chapter 5: EROSION & SEDIMENT CONTROL FACILITIES
5.2 Erosion control facilities.
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Chapter 5: EROSION & SEDIMENT CONTROL FACILITIES
5.3 Runoff management facilities.
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Chapter 5: EROSION & SEDIMENT CONTROL FACILITIES
5.4 Sediment control facilities.
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Generic Guideline for ESCP
Minimizing Soil Erosion
Preserving Top Soil & Other Assets
Access Routes
Drainage Control
Earthworks & Erosion Control
Sediment Prevention & Control
Slope Stabilization
MaintenanceGeneric Guidelines for ESCP
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THE WAY FORWARD
• A consultant company may bid for fundingthrough State or JPS Federal (BSMA) toproduce the manual.
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• MSO could provide the interested parties withits own version of ‘Terms of References’ –contact Dato Fuad/me(IR Azman).
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REFERENCES• Department of Irrigation and Drainage (2010). Guideline for Erosion and
Sediment Control in Malaysia, Department of Irrigation and Drainage, Malaysia.• Land and Survey Department, Sarawak. Directorate of National Mapping. (1968)
Soil Map of Sarawak. Malaysia Timor. Sheet A & B. Fromhttps://esdac.jrc.ec.europa.eu/content/soil-map-sarawak-malaysia-timor-sheet
• Director of National Mapping, Malaysia. Kota Kinabalu. The Soils of Sabah. SheetNB 50-10. From https://esdac.jrc.ec.europa.eu/content/kota-kinabalu-soils-sabah-sheet-nb-50-10-dos-3180e
• Oon, Y.W., Chin, N.J.and Law, P.L. (2011). Soil Erosion and Sediment Yield of aSanitary Landfill Site: A Case Study, UNIMAS E-Journal of Civil Engineering, Vol. 2(2).
• Leow, C. S., Ghani, A. B., Zakaria, N. A. & Abidin, R. Z. (2011). Development ofrainfall erosivity isohyet map for Peninsular Malaysia. Rivers 2011 .6th– 9thDecember 2011, Penang, Malaysia.
• Roslee R, Bidin K, Musta B, Tahir S, Tongkul F, Norhisham M.N. (2017). GISApplication for Comprehensive Spatial Soil Erosion Analysis with MUSLE Model inSandakan Town Area, Sabah, Malaysia.. Geo. Behav. 1(1)01-05
• Gregersen, B, Aalbæk, J, Lauridsen, PE, Kaas, M, Lopdrup, U, Veihe, A & van derKeur, P (2001). Land use and soil erosion in Tikolod, Malaysia. ASEAN Review ofBiodiversity and Environmental Conservation (ARBEC) January-March 2003
• EnviroCert (2015). CPESC General Principles Review Manual.• Pictures from Borneo Post, Minden Pictures, The Malay Mail etc.