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IS 15872 (2009): Application of Coir Geotextiles (CoirWoven Bhoovastra) For Rain Water Erosion Control in Roads,Railway Embankments and Hill Slopes - Guidelines [TXD 30:Geotextiles and Industrial Fabrics]

IS 15872 : 2009

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Indian Standard

APPLICATION OF COIR GEOTeXTILES(COIR WOVEN BHOOVASTRA ) FOR RAIN WATER

EROSION CONTROL IN ROADS, RAILWAYEMBANKMENTS AND HILL SLOPES - GUIDELINES

ICS 59.0XIUO

O BIS 2009

B UR E A U O F I NDI A N S TAN DA R DSMANAK BHAVA N. 9 BAH AD lJ R S HA H Z A FA R MAR G

NEW DELHI I 10002

March 2009 Price Group 2

Gcosynthet ics Sectional Commiuce, TXD 30

H>REWORD

This Indian Stand ard was adopted by the Bureau o f Indian Standards, after the draft finalized by the GeosyntheticsSect ional Committee had been approved by the Textile Div ision Council.

The use of natural li bre geotext iles has been recogn ized in erosion co ntrol in embankmen t co nstruc tio n for roadsand railways, dam engineering, canals, etc and in road pavements. Their increasin g imp ortance is due to theirversatility based on the ir spec ific prop erties.

For applicat ions, it is desired that the geotextiles maintain integrity during the course of its life and do not tear,split and deteriorate under constructional or post-con structi onal stresses.

From the view point o f appl icati ons of natural fibre geotextiles, guidelin es for applica tion in water erosioncontrol need to be es tablished .

Woven coi r bhoovastra is a natural coi r matt ing. Th is woven coir bhoova stra can be used for rainwater erosionco ntrol in road and railwa y embankment s and hill slopes. Exposed soi l surface road and ra ilway embankmentsand hill slopes by impa ct of rain drops and surface wind which cause surface run off particles. These particlescarry seeds and soil nutrients. Natural growth of vegetation on slope will protect the surface soil. By the applicationof woven coir bhoovustra redu cing the effects of raindrops and controlling surface soil particles. Woven co irbhoovustru form s mulch and foster s qu ick vegetat ive growth. The selection o f woven co ir bhoovastra is basicall ydepend on type o f soil to he protected ensured pr imarily from rain water erosion is gee- tec hnically stable. Th ese lection o f woven coi r bhoovastra basicall y dep end s upon the slope and the ex treme rain fall in a lim ited timespan.

For the purpose of deciding whether a particular requirement of this standard is complied with , the final value,observed or calculated, expres sing the result of a test or analy sis, shall he rounded off in accordance with IS 2 : 1960'Rules for rounding off numerical value s ( rev ised)' . The number of significa nt places retained in the rounded offvalue sha ll he the same as that of the speci fied value in this standa rd .

IS 15872 : 2009

Indian Standard

APPLICATION OF COIR GEOTEXTILES(COIR WOVEN BHOOVASTRA) FOR RAIN WATER

EROSION CONTROL IN ROADS, RAILWAYEMBANKMENTS AND HILL SLOPES - GUIDELINES

I SCOPE

This standard pre scribes the code for the guidel ines ofwoven coir bhoovastra suitable for applicat ion in slopesof road and railway embankments and also in hill slopesincluding the selection of wo ven coir bhoovastra andinstallation methods.

2 MATERIALS

2.1 Coir Woven Bhoovastra

Open structure coir woven bhoovastra made out of coirthreads in wh ich each warp thread get s interl acedalternatively over and under by successive weft thre ad.

3 MECHANISM OF SOIL EROSION

Expose d soi l surface road and railway emban km ent sand hill slope s by impact of rain drops and surfacewind which cause surfac e run off particles . Theseimpacts detach the soi l particles and carrie d away bythe surface run off. These particles carry seed s and soi lnutrients. Nat rral growth of vegetation on slope is thushindered.

4 ROLE OF COIR WOVEN BHOOVASTRA INSURFACE EROSION CONTROL

Coir woven bho ovastra are permeable co ir fabricsmade from natural coir fibre. Coir woven bhoovastracontrol soil erosion by acting as a ground co ver. As aground cover. it reduces the flow velocity of run offwater by forming check dams with help of netstructured strands of co ir woven bhoovastra in firmco ntact with so il, wh ich ab sorb the impact of waterflow and resist washing down keeping the soil intact.

5 SELECTION OF COIR WOVEN BHOOVASTRA

The choices of coi r woven bhoovastra basically dependon the type o f so il to be pro tected . It requires to beensured primaril y that the slope to be protected fromrainwater eros ion is gee-technically sta ble. It aborequired considering the ex treme rainfall in a limitedtime span at that location as the intensity of ra infall ismore importa nt than the average annual rain fall. It isrecommended that the choice ofcoir woven bhoovastra

shall be 400nOO where intens ity of ra infall is severeirrespective of type so il and slope is < I : I .

6 INSTALLATION METHOD

6.1 The stages o f laying of woven coir wo venbhoovastra on slopes for rain water erosion co ntro larc as under.

6.1.1 Th e slope shall he made free from undulations.soil slurry, mud and sharp projections and compac tedwith additional earth where necessary.

6.1.2 An choring tren ches shall he excavated at the topand toe of the slope along the slope downward. caring10 see that it touches the soi l surface at all points.

6.1.3 The selec ted co ir woven bhoovastra shall beunrolled ac ross the top trench and along the slopedownward , caring to sec that it touches the soil surfaceat all points.

6.1.4 O verlaps sha ll be minimum 150 mm ar sides andends (see Fig . I). The coir woven bhoovastra at thehigher level on the slope shall be placed over level.Side overlaps of a coir woven bhoovastra piece shallbe placed over its next piece o n one side and under thenext piece on the other.

6.1.5 The coir woven bhoovastra shall be fixed inposition by steel staples of 220 mm lengths (usuallyof 11 gauge diameter) or by spilt bamboo pegs . Staplingshall be done normally at an interval of 500-750 mmboth in longitudinal and transverse directions. Specialcare shall be taken to staple the co ir woven bhoovastrawithin the anchoring trenches (300 mm depth and150 mm width) both at the bottom and at the sides .

6.1.6 The anch oring trenches shall be filled up withbrick-bats/soil for preventing displacement of the co irwoven bhoovastra. Care shall be taken that the overlapsare not displ aced during installation.

6.1.7 Care shall be taken to ensure that the coir wovenBhoovastra is not damaged due to puncture. lear andothe r operationa l stresses.

6.1.8 Seeds of vegetation (grass. legumes . etc . o fappropriate variety) shall than be spread (Annex A for

IS 15872 : 2009

FIG. I OVERLAPPING OF COIR WOVEN BHOOVASTRA

guidance in selecting the species of vegetation). If seedsare not available, saplings of the appropriate plantspecies may be planned at suitable intervals throughthe opening of the coir woven bhoovastra.

6.1.9 In special circumstances. a second dose of seed smay be spread with dibbling of locally available grass.

6.1.10 Installation shall be completed preferably beforethe monsoon to take advantage of the rains for quickgermination of seeds.

7 MONITORING

7.1 Close mon itoring shall be done for at least oneseason cycle.

7.2 The treated area shall be kept out of bounds for

2

cattle and other grazing an imals till the time of maturityof vegetation.

7.3 The damage and displacement of coir wovenbhoovastra shall be noted for corrective act ion. Tornportions of the coir woven bhoovastra shall be coveredwith new pieces of coi r woven bhoovastra of identicalspecification duly stapled at all sides.

7.4 Watering/maintenance of identical speci ficationsduly stapled at all sides.

7.5 Advice shall be sought from specialist to find outcause of unsatisfactory growth of vegetation. Witheredplants shall be replaced. Species of vegetation needsto be selected carefully considering the local soil andclimatic conditions.

IS 15872: 2009

ANNEXA(Clause 6.1.8)

GUIDANCE IN SELECTING THE SPECIES OF VEGETATION

Name of the Species

Avicennia officinalisRhizophora mucrunataCyperus mxaltatusAcrostichum mureumAdiantum spices

Cyanodon dactyl onCenehurs ciliariesEragrostis curuvlaDianthum annulatumPennisetum pedicellatum

Both rochola glabraStylosunthis gracilisStylosamth is gusineusis

Pucraria hirsutePennisetum purpureum

Peuraria hirsta

Suited for

Shrub suitable for marshy placesShrub suitable for marshy placesGrass suitable for highway slopesShrub suitable for dam sitesShrub suitable for dam sites

For light sandy soil sFor most types of soilFor protecting terraces and channelsFor light soi lFor sandy loa:n soilFor red scmi-arid soi I

For light soils with low moistureFor light and med ium soil with low moisture

Cover cro p suited to alluvial soil and for hills in humid cl imateFor hill slopesCover crop suited to alluvial soil

']

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This Indian Standard has been developed from Doc: No. TXD 30 (0959).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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