Page 34 - GRIHA Manual Volume II - Introduction to National Rating System
P. 34
26 GrIha Manual: Volume 2
Application Geotextiles could be used alone as a soil stabilizing technique. When used alone it could
be used as a mat to stabilise the flow on channels and swales. Matting could also be used to stabilize
recently planted slopes to protect the seedlings till they get established. Geotextiles could also be
integrated for embankment stabilizations through rip rap where extreme steep slopes exist that
are subject to storm water run-off. Fabric as a filter could be used to protect the soil beneath from
effects of flowing water.
Sediment trap
A sediment trap can be constructed by excavating a pond across a low-lying area on the site. The
trap should retain the run-off enough to allow the sediments to settle before they are released. The
outlet is constructed using large stones and aggregate to slow down the release of run-off. This
system is appropriate for small drainage areas not more than 10 acres (Source: EPA, Chapter 3 –
Sediment and Erosion Control). The volume of the storage required depends upon the surface type
and rainfall intensity.
Application: A temporary sediment trap could be used in conjunction with swales, contour trenches,
earth dikes, diversion channels. Sediment traps are suitable for small drainage areas, less than 10
acres. The traps should be maintained till the site area is permanently stabilized through vegetation
and or when permanent structures are in place.
Figure 12 Sediment trap
Step 3
Appraisal 2.3.6 requires preservation of existing trees and preventing damage to the same during
construction. When planning the site interventions, care should be taken to keep vegetation clearing
Application Geotextiles could be used alone as a soil stabilizing technique. When used alone it could
be used as a mat to stabilise the flow on channels and swales. Matting could also be used to stabilize
recently planted slopes to protect the seedlings till they get established. Geotextiles could also be
integrated for embankment stabilizations through rip rap where extreme steep slopes exist that
are subject to storm water run-off. Fabric as a filter could be used to protect the soil beneath from
effects of flowing water.
Sediment trap
A sediment trap can be constructed by excavating a pond across a low-lying area on the site. The
trap should retain the run-off enough to allow the sediments to settle before they are released. The
outlet is constructed using large stones and aggregate to slow down the release of run-off. This
system is appropriate for small drainage areas not more than 10 acres (Source: EPA, Chapter 3 –
Sediment and Erosion Control). The volume of the storage required depends upon the surface type
and rainfall intensity.
Application: A temporary sediment trap could be used in conjunction with swales, contour trenches,
earth dikes, diversion channels. Sediment traps are suitable for small drainage areas, less than 10
acres. The traps should be maintained till the site area is permanently stabilized through vegetation
and or when permanent structures are in place.
Figure 12 Sediment trap
Step 3
Appraisal 2.3.6 requires preservation of existing trees and preventing damage to the same during
construction. When planning the site interventions, care should be taken to keep vegetation clearing
