This routine is used to design small open channels that are
constructed as part of a highway drainage system. The roadside
channels capture sheet flow from the highway pavement and backslope
and convey the runoff to larger channels or culverts with the
drainage system. There two classes of channel lining materials:
rigid or flexible channel linings. Flexible linings are able to
adjust to some change in channel shape and are used in this
routine.
Four types of channels are available in the routine. They are
Rectangular, Triangular, Trapezoidal and Irregular type. Enter
design flow to calculate channel depth, or enter channel Depth to
calculate channel flow. When lining is used, the lining shear
stress is calculated too. There are six types of channel linings in
the lining analysis and please refer to HEC15 for details.
Grass Lining: Grass lining analysis is based on HEC15,
chapter 4 - Vegetative lining and bare soil design.
Grass Turf Lining: this is a turf reinforcement with gravel/soil mixture. The gravel provides a matrix of sufficient thickness and void space to permit establishment of grass roots within the matrix. Turf analysis is based on HEC15, chapter 4 - Vegetative lining and bare soil design.
Riprap, Cobble, or Gravel Lining: These linings are
considered permament flexible linings. They may be described as a
noncohesive layer of stone or rock with a charactoeristic size,
which is D50. Its analysis is based on HEC15, chapter 6 - Riprap,
cobble, and gravel lining design.
Gabion Lining: Gabions (rock filled wire containers) represent an approach for using smaller rock size than would be required by riprap. The smaller rock is enclosed in larger wire units in the form of mattresses or baskets, and the thickness of the gabion mattress may be less than the thickness of an equivalently stable riprap lining. The analysis is based on HEC15, chapter 7 - Gabion lining design.
RECP, Rolled Erosion Control Product: RECPs are developed
for erosion protection of channels. These products consist of
materials that are stitched or bound into fabric. RECP analysis is
based on HEC15, chapter 5 - Manufactured (RECP) lining
design.
Turf Reinforcement with RECPs: This is a non-degradable RECP
composed of UV stabilized synthetic fibers, filaments, netting
and/or wire mesh processed into a 3D matrix. Its analysis is based
on HEC15, chapter 5 - Manufactured (RECP) lining design.
Pulldown Menu Location: Structure > Channel Design >
Channel Lining Analysis
Keyboard Command: channel_lining
Prerequisite: none