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Infiltration Half Drain time calculations

We have recently been challenged by Wiltshire LLFA regarding half drain times. As I understand it, Flow calculates the half drain time to CIRIA 156 which gives a significantly longer half drain time than the BRE365 method that Micro Drainage uses....
Ben Stoodley 5 months ago in Flow 1 👷🏽‍♀️Promoted

Time to half empty Calculations

I have a request regards time to half empty of infiltration systems. Irrespective of what I set in the preference page (whether time to half empty by volume or by storm) I just get time to half empty of the structure. That isn’t very useful inform...
Steve Doughty 9 months ago in Flow 0 👷🏽‍♀️Promoted

Total Impermeable Area on Calcs Printout

The sum of the total impermeable area is not currently printed on the calcs, this could be incorporated with the total Time/Area information (as per a previous suggestion) as MicroDrainage does.
Ian George almost 2 years ago in Flow 0 👷🏽‍♀️Promoted

Pipe Selection/visibility in output

There is often need to hide certain pipes from the final output. Either they are dummy pipes that have no relation to the final layout or they are areas outside the specific design network that do not need to be included in the report. Microdraina...
Guest 11 months ago in Flow 0 👷🏽‍♀️Promoted

When changing gradients on pipe, automatically changing the downstream pipe to level soffit rather than having to change invert level manually.

No description provided
Tom Fox over 1 year ago in Flow 0 👷🏽‍♀️Promoted

Urban Creep

Global urban creep isn’t helpful. We have a process of assessing UC on a pipe-by-pipe basis. We separate the areas that UC should be applied to and areas such as flats the highway that don’t need it. If global UC is applied, then you are adding 10...
Ben Stoodley 11 months ago in Flow 1 👷🏽‍♀️Promoted

Total Volume of Structure

Finding total volume of a structure would be useful (similar to the volume Static Tool in MicroDrainage).At present the only way to do it is look at the storage tab and hover over a depth in the storage structure section and it shows the depth and...
Ian George almost 2 years ago in Flow 0 👷🏽‍♀️Promoted

Include check dam option in swales

Check dams are commonly used in swales to temporarily pond runoff to increase pollutant retention and infiltration and decrease flow velocity, but Flow does not have an option to model them. As they are a recognised SuDS feature, and commonly used...
David Collins almost 2 years ago in Flow 2 👷🏽‍♀️Promoted

Add Urban Creep locally for each area/catchment

This is especially applicable now given some areas may have 100% impermeable while other will have greenfield with a possible option to turn to impermeable. Users can also adjust Cv value locally. The design report should contain the new additions.
Tom Fox over 1 year ago in Flow 0 👷🏽‍♀️Promoted

Quick Storage Calculations For Soakaways Without The Use Of The Base

When looking at the preliminary quick storage calculations used for preliminary designs/drainage strategies, the quick storage tool is excellent up until the point you want to design soakaways as there is no option to get a quick storage calculati...
Guest 8 months ago in Flow 0 👷🏽‍♀️Promoted