hydroseeding for erosion control
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HYDROSEEDING FOR EROSION CONTROL
COASTLAND GEOTECHNICS LLP C-60 APIE,Balanagar,Hyderabad Tel:8879253634 040-42410162
TEAM
P.T. Raju has wide experience in design of ground improvement and soil retentions structures over more than 12 years, which includes most prestigious projects building 42 m high retaining walls. His papers are published in international conferences and technical books.
Mr. Sreedhar Vanta has over 15 years experience in the geotechnical and construction industry. His key area of expertise includes turkey execution of slope retentions, deep foundations and bridges.
Mr..Rajesh Sunke has wide experience in business development over 15 years in construction industry. His key area of expertise includes sales and marketing strategies for large civil projects.
COASTLAND
COMPANY
Coastland has provided reliable, top-quality construction of pre-designed geotechnical systems. Our team also provides design-built solutions that are customized to your specific needs and requirements. Our team also provides design-built solutions that are customized to your specific needs and requirements.
COASTLAND
Erosion Control Ground
Improvement Earth Retention Deep Foundations
HYDROSEEDING ??
The process of combining seed, mulch, fertilizer, and soil amendments with water to mix in a Hydroseeder® tank to form a thick slurry. This slurry is applied with pressure to the surface for seed germination and turf development.
WHY HYDROSEEDING??
Cost effective less laborious
Vegetation quality
More coverage in less time
Erosion Control
Ideal Microenvironment for seed germination and high
water retention
WHERE HYDROSEEDING??
Residential & Commercial Bldgs
Erosion Control Golf Courses
Landfills Roads & highways Sports Fields
CASE STUDY
PROJECT : JAMMU Central University Location : Village Bagla – Samba District Application : Erosion control on 65°Reinforced soil slope with WMM Facing Area : 40000 sqm
CASE STUDY : SOIL CHARACTERISATION
Soil core sample collected from project site was subjected to analysis at Laboratory
• Soil pH – 6.5-7 • Organic matter content - >3.5% • Nitrogen – Low • Phosphorous – Medium • Potassium - Medium
By considering the soil test report, suitable fertilizer mix was added along with hydromulch to provide sufficient nutrients to vegetation
SEED GERMINATION IN PROJECT SOIL
(a) With-out soil amendments (b) With soil amendments using proprietary mulch
“Nat Matrix”
SELECTED GRASS SEEDS
Seeds of Stylo hamata Stylo hamata vegetation
By considering soil parameters and agroclimatic conditions in project area we selected leguminous grass Stylo hamata will be used to establish the vegetative cover.
Being a leguminous crop it not only prevents erosion but also improves the soil properties by Nitogen fixing. Seed selection is duly supported by the scientists of Indian Agricultural Research
Institute (IARI) and Indian Grassland and fodder Research Institute (IGFRI)
SEED PURITY TESTING
In order to avoid the contamination with other weed seeds at we are testing the seed purity using Polymerase Chain Reaction (PCR) and genetic analyzer at our facility
Thermocycler Genetic Analyzer
CG hydro mulch is a proprietary blend of cellulosic fiber, cocopeat, fertilizer and tackifier.
CG mulch product is composed of organic fibers that will degrade over several months.
CONTENT PARAMETER
Moisture Content 20%
Organic Matter 95%
pH 6-6.5%
Water Holding Capacity 100 gm DW will hold 1000 grams of water
“CG MULCH” – PRORIETERY MULCH
First tackifier, “CG MULCH” were mixed, followed by seeds and soil amendments to get a consistent slurry
Small scale mixing process for hydroseeding components
HYDROSEEDING MULCH PREPARATION
LABORATORY TEST SCALE
• The slurry was applied on soil test box as shown in figure. • Application started from top of slope to down. • The seeded boxes were watered regularly.
Hydroseeding by manual application
Since the project location is with a slope of 45-75 o slope A simulated model was conducted AMNION to optimize the different contents of the hydroseeding slurry.
To represent the slope test boxes were constructed at 65o slope with a surface dimension of 106cm by 63cm wide and test boxes were covered with soil from project site.
The soil was compacted like natural conditions and for every layer of 10 inch the soil test box was compacted with use of ply board.
ARTIFICIAL SIMULATED SLOPES
The critical part in the current project is germination of seeds on geotextile We provided solution using our product “NAT MATRIX”
Germination of seeds on “NAT MATIX”. Geotextile placed
below mulch
Demonstration of root penetration through geotextile
SEED GERMINATION ON GEOTEXTILE
1.The areas to be hydroseeded shall be uniform. Minor shaping and uniforming of uneven and rough areas shall be performed in order to provide more effective erosion control and for ease of subsequent mowing operations.
2.Vertical stritations or grooves shall be absent from the final trimmed slope. Instead a rough textured surface with loose soil shall be prepared. Where the surface microtopography varies by ±20mm from the formation level, an acceptable treatment is to provide horizontal grooving with semicircular or “v” shaped groove, 20mm deep, at an interval of 200mm downslope on all cut slopes. Any surface rills in excess of 25mm shall be rectified by retrimming
SITE PREPARENATION
3.Gullies or local washouts shall be backfilled with suitable material
places in layers of up to 200mm thick, each layer being compacted by hand ramming or by light weight vibration plate compactors. Large stones greater than 50mm shall be removed. Slopes that have been exposed for a long time must be trimmed and scaled to remove any oxidized layer prior to hydroseeding.
SITE PREPARENATION
METHODOLOGY
Hydromulch material is a proprietary blend of mulch fiber, seeds, tackifiers and fertilizer, which need to be sprayed at a rate of 200g per square meter in case of 45° slopes and 350g per square meter in case of 75° slopes
In order to ensure the complete vegetation, first round of hydromuch material will be applied on stabilized slopes. Soon after the sprouting of grass seeds (approximately in a week time), erosion control blanket will be laid on the slopes.
The second round of hydromulch material will be applied on the erosion control blanket to ensure complete vegetation using AMNIONs mobile Hydroseeder unit.
HIGHTHROUGHPUT APPLICATION AT PROJECT SITE WITH HYDROSEEDER
Hydroseeder available at our facility for high throughput application at project site
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