The associated model and definition demonstrating the use of these components can be downloaded here.
Channels
Components for deriving and analysing water flows within a sectional profile.
The first channel component, Channel Region, determines a water level for a given section and a given area of water. It allows different channel geometries to be tested against a particular capacity of water and thus quickly gauge the efficacy of different profile geometries.
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Determine the submerged region of a channel given a quantity of water
| Mode | Name | ID | Description | Optional | Type |
|---|---|---|---|---|---|
| Channel |
C
|
The sectional curve profile of the channel; must be planar and vertically-aligned (i.e. it fills up in the Z-axis) |
CurveParameter
|
||
| Area |
A
|
The desired area of the flow body. If unspecified it will try to guess a sensible value to use that can serve as a reference |
NumberParameter
|
||
| Precision |
T
|
The number of units to be accurate to in finding a matching area. If unspecified it will use 0.01% of the area. Smaller values will take longer to calculate. |
NumberParameter
|
||
| Channel(s) |
C
|
The perimeter(s) of the calculated water body or bodies |
CurveParameter
|
||
| Area(s) |
A
|
The area of the calculated water body or bodies |
NumberParameter
|
The second channel component, Channel Info, calculates a number of hydraulic calculations from the sectional area determined by the Channel Region component. Most of these are geometric (e.g. Mean Depth) but a number of others can be calculated if the component is provided with a slope value and a roughness coefficient for the channel.
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Calculate characteristics of water flow in a channel from its submerged region
| Mode | Name | ID | Description | Optional | Type |
|---|---|---|---|---|---|
| Channel |
C
|
A closed planar curve representing a section of the water body; assumes a level top |
CurveParameter
|
||
| Roughness |
N
|
Manning’s roughness coefficient for the channel |
NumberParameter
|
||
| Slope |
S
|
Slope of the hydraulic grade line as a decimal (i.e. rise/run = 0.5) |
NumberParameter
|
||
| Area |
A
|
Area of the channel |
NumberParameter
|
||
| Max Depth |
mD
|
Maximum depth of the channel |
NumberParameter
|
||
| Mean Depth |
aD
|
Mean depth of the channel |
NumberParameter
|
||
| Wetted Perimeter |
P
|
Length of the channel in the boundary |
NumberParameter
|
||
| Hydraulic Radius |
R
|
Ratio of area to wetted perimeter |
NumberParameter
|
||
| Velocity |
V
|
Velocity of the water flow in the channel |
NumberParameter
|
||
| Discharge |
Q
|
The rate of discharge in cubic document units per second |
NumberParameter
|
Grasshopper definition demonstrating how to use the channel region and channel profile components.
Philip Belesky, for https://groundhog.philipbelesky.com