311 Stormwater Drainage – Design and Analysis using the Rational Method

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About Course

Stormwater Drainage – Design and Analysis using the Rational Method

Hydrology and Hydraulics and Overland Flow and Pipe Sizing
Full Disclosure:  This course is about Stormwater Drainage.  If you are looking for the basket weaving course, then please click the ‘back’ button.
Stormwater Drainage can be overwhelming:  There are lots of interlocking parts, and lots of settings and configurations.
In this course we do our best to demystify the process, and give you workflows that will work with any project.
We start with a network, and we put some water into a grated inlet at the top of the netwrok, and see how the Hydraulic Engine calculates the HGL (Hydraulic Grade Line) as the water runs through the pipes to the outfall.
Then we add a bypass route to the node (inlet) so that some of the water is captured, and some bypasses.
Once we have bypass, we can calculate the width and velocity of flow in the gutter.
When we have ticked those boxes, we add catchments, and rainfall, and runoff coefficients, and have 12d calculate the runoff from the catchments.
We talk about ‘time of concentration’ (Tc) and how it can be set manually or calculated by 12d Model.
We talk about ‘partial area’ calcs, and why they are a good idea.
If you have an understanding of the Rational Method you will find familiar tools and concepts here.  If Rational Hydrology is a mystery to you, we explain enough of the theory for you to understand the concepts and to understand the tools in 12d Model.
When you have completed this course:
You will have used 12d Model to calculate catchment flows, node inlets, pipe flows and velocities, and overland flow widths and depths.
You will have resized the pipes in a network to carry the captured flows.
You will understand what happens when pipes are too small, and how Qx routing operates

Course Outline

  • Open an existing project complete with Stormwater Network
  • Analyse the Network for flows generated from external sources and from catchments.
  • Investigate the effects that Node Loss Coefficients (Ku & Kw) have on the HGL in a network
  • Use 12d Model’s CAD tools for basic drafting
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Course Content

Get Started Here
Download and Unzip the 12d Model Project that we will use for this course, and a brief overview of the Project

Hydraulic Analysis #1 – External Flows and Known Catchments
Add a known flow to Node A/2, and examine how it flows through the network. Add catchment areas to B/1 and B/2 and use Rational Hydrology to determine the peak flows off these catchments, and how these flow move thorugh the network

Analysing Overland Flows
We look at the width, depth and velocity of water flowing in the gutter

Errors and Warnings #1
At this stage in our analysis of the network, we are putting more water into the system than it has capacity to carry. This topic explains the error and warning messages that 12d Model sends to the user.

Catchments for All!

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