Sign In

Best Practices

 

The best way to minimise erosion is to reduce the amount of exposed earth surfaces on site. This can be achieved by phasing of earth works, covering up exposed earth areas with erosion control blankets of canvas covers, early reinstatement, paving etc. To reduce silt discharge from the remaining exposed earth areas, apply Best Practices as follows:


Cut-off drains


Erosion Control Blanket (ECB)


Silty water treatment system


Silt fence


  1. Install effective final treatment facilities, such as silty water treatment plants
  2. Ensure adequate holding capacity of the holding sump/pond for collection of silty water
  3. Treat silty water collected immediately to ensure adequate storage is always available
  4. Educate/supervise site works staff to maintain ECM at all time
  5. Access weather forecast on NEA's website to take ECM actions before a rain event
  6. Install online CCTVs and Total Suspended Solids (TSS) meters to monitor discharges at all times

No Silty Discharges

 
 

 

 

No Bare Surface

 
 

 

 

Silt Fence & Cut-off Drain

 
 

Silt fence not properly embedded resulting in gaps below the fence & Silt fence installed on the wrong side. It should be installed to trap the silt from the worksite.

 

Silt fence firmly embedded in ground and installed in between cut-off drain and worksite.

 

Silt Trap

 
 

Inadequate silt trap resulted in silty water discharges onto adjacent public place.

 

Silt trap properly designed with the usage of polymer block & geotextiles. (note: sand or granite chip as filter is not accepted)

 

Silty Water Treatment System

 
 

 

 

Turbidity Curtain

 
 

 

 
Overview

The best way to minimise erosion is to reduce the amount of exposed earth surfaces on site. This can be achieved by phasing of earth works, covering up exposed earth areas with erosion control blankets of canvas covers, early reinstatement, paving etc. To reduce silt discharge from the remaining exposed earth areas, apply Best Practices as follows:

(Click on image for an enlarged view)

(Click on image for an enlarged view)

1. Seal Hoarding Footing and Hoarding Gaps 

(Click on image for an enlarged view)

2. Provide Hump at Site Entrance 

(Click on image for an enlarged view)

3. Provide Adequate Silty Water Treatment Capacity

(Click on image for an enlarged view)


4. Provide Adequate Holding Pond

(Click on image for an enlarged view)

5. Provide Cut-off Drain Around the Site Boundary

(Click on image for an enlarged view)

6.  Isolate Bare Earth Areas with Silt Fences

(Click on image for an enlarged view)

7. Cover Stockpiles

(Click on image for an enlarged view)

8. Pave Up Access Path / Road

(Click on image for an enlarged view)


9. Cover Bare Earth Area After Work

(Click on image for an enlarged view)

10. Pave Up Site Office Areas

(Click on image for an enlarged view)

11. Provide Cut-off Drain to Separate Clean Water from Silty Water

(Click on image for an enlarged view)


12. Install CCTV at Public Drain to Monitor Discharge​