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Class Exercise

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Estimating the amount of soil stabilization material need to protect disturbed soil areas ... Disturbed Soil Area. 5. Sediment Control Calculations ... – PowerPoint PPT presentation

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Title: Class Exercise


1
Class Exercise
  • Soil Stabilization
  • Sediment Controls
  • Verify the contractors calculations for the
    quantity of material need to stabilize a
    Disturbed Soil Area (DSA)

2
Soil Stabilization and Sediment Controls
Calculations
  • Soil stabilization
  • Estimating the amount of soil stabilization
    material need to protect disturbed soil areas
  • Sediment control
  • Estimating the amount of sediment control
    material need to protect disturbed soil areas
  • Breaking up slope length
  • Estimating the amount of fiber rolls or gravel
    bag berms needed to break-up slope lengths

3
Soil Stabilization Calculations
  • Use Table 2-2 to determine which slopes require
    stabilization

4
Soil Stabilization Calculations
  • Calculate the total DSA that will require soil
    stabilization

Disturbed Soil Area
5
Sediment Control Calculations
  • Use Table 2-2 to determine which slopes require
    linear barriers

6
Linear Barrier Calculations
  • Calculate total length of Linear barrier needed

Linear Barrier
7
Slope Length
  • Use Table 2-2 to determine what slopes require
    breaking up the length

8
Slope Length
  • Spacing of Fiber Rolls

9
Slope Steepness
  • Calculating Slope Steepness
  • Rise Over Run
  • Slope steepness can be expressed by comparing the
    slopes horizontal component to the vertical
    component 1V 2H

1V3H
Rise Run
Slope
Rise
14 m
V
H
42
Run
10
Slope Length Calculations
  • Pythagorean Theorem
  • A2 B2 C2
  • A42
  • B14

C
B
A
11
Soil Stabilization Calculations
  • Calculate the total DSA that will require fiber
    rolls

12
Class Exercise
  • Break in to groups of 4 to 5 people
  • Handouts
  • Plan sheet
  • Tables
  • Calculate SS and SC materials

13
Erosion and Sediment Control Labor Estimates
  • Sediment Controls
  • Silt Fence
  • 4 men and 5 labors
  • 1000 linear ft a day
  • Fiber Rolls
  • 4 men and 5 labors
  • 1500 linear ft a day
  • Soil Stabilization
  • Hydroseeding
  • 150,000 ft2 a day (flat turf)
  • 22 bales _at_ 50lb a bale in a 3000 gal truck
  • Hydro Mulch (BFM)
  • 12,000 ft2 per 3000 gal truck
  • 5 loads per day
  • Straw Mulch
  • .4 Hectare an hour
  • 1 to 2 bales a min
  • 74 lb bale covers 800 ft2 _at_ 2 tons per acre

Estimates are based on vendor quotes actual
installation time will vary based on site
location, Slope steepness, and accessibility.
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