ARD and Watercom Drains - About Multiple Networks and Adding Extra Pits #
Posted by Shane O'Rorke on 13 March 2020 04:44 PM
Multiple Networks Across to Drains
It is common to have multiple networks that are required in Drains. One scenario for this would be a pipe network that leads to a detention basis, which then flows out to another series of pipes in a second pipe network.
Here is a process for moving the data to and from DRAINS:
Managing Additional Pipes and Pits, or Relocation of Pipes and Pits
You might find that additional pipes/pits are required once you start analysis in DRAINS. The recommended process is to:
The Drains import only affects pits, pipes, catchments and overland flow paths that have matching 'names' from ARD (these are the names you give the pits after doing a branch sequence - make sure they are unique across all networks).
Channels, basins, weirs, orifice outlet controls and other DRAINS items are unaffected by the re import of ARD pipe and pit data, Drains doesn't wipe the whole model when you import from ARD - it just replaces pits, pipes and catchments with the same names, and adds new items.
About Catchments and Overland Flow Paths
Each catchment in ARD can be given a Description. Assigning a description of PA sets the areas as Paved, GR assigns the area as Grassed and Sup assigns the area as Supplementary. ARD will sum up the areas of 1 paved, 1 grassed and 1 supplementary catchment added to an ARD pit to make a single catchment in Drains.
You can set in ARD where the assumed overland flow goes (we call it Bypass). There is a command to set the bypass pit/s to send flow to. ARD auto assumes flow to the next downstream pit, but you can change that. Drains should respect this. In DRAINS, you must have an overland flow path template named ARD, otherwise the import may fail.
Starting a network in DRAINS and importing into ARD
This is not supported - you must first create the pipes and pit network in Advanced Road Design, then send it to DRAINS.
The data exchange process map in the ARD help system is useful to give an overview of the steps required - in the help system expand Pipes > Process Maps > Data Exchange Workflow. This sums up the above steps to happiness.