
2018 Indiana Design and Installation Manual
29
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5.0 Elevated Sand Mound Design and Installation
5.0.8 SAND EXTENSION:
For Elevated Sand Mound systems between 0.5% and 6% slope, a minimum of 4 feet
of INDOT SPEC 23 sand extending from the edge of the furthest downslope GSF module is required. If the design
calls for less sand than prescribed above, add a downslope sand extension to meet the minimum 4 foot sand
requirements from the edge of the furthest downslope GSF module.
5.0.9 MINIMUM SLOPE REQUIREMENTS:
Maintain a 3:1 slope or gentler for all slopes off the application area.
Elevated systems using GSF modules will not be permitted on slopes greater than 6%.
5.0.10 SUBSURFACE DRAINS:
If subsurface drains are utilized they must remain 10 feet from the edge of the
system sand perimeter.
FIGURE 15: CROSS SECTION – MOUND SYSTEM
EXISTING GRADE GREATER THAN 0.5%
1
3
A
C
D
APPLICATION AREA
7"
F
G
H
W
NATIVE SOIL
ORIGINAL GRADE
TILLED
1' BERM
FIGURE 16: PLAN VIEW – MOUND SYSTEM
ELJEN APPLICATION AREA
1 FOOT BERM
SOIL COVER BERM
B
I
L
G
A
H
W
Содержание GSF A42
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