Integrated BIM tools, including Revit, AutoCAD, and Civil 3D
Professional CAD/CAM tools built on Inventor and AutoCAD
Any referenced datasets can be downloaded from "Module downloads" in the module overview.
Transcript
00:03
for drainage designs to be valid in the U. K.
00:06
They generally have to comply with the methodology
00:08
set out in the design and construction guidance
00:11
cG
00:12
formerly known as sewers for adoption.
00:16
That means they have to meet two criteria.
00:18
No surcharge and no flood
00:22
pipes have to be sized adequately and effective storage solutions need to be built
00:27
to do that.
00:28
It is vital to understand and accurately
00:30
represent the inflows entering a drainage network.
00:34
This makes it very important to use the right rainfall
00:37
methodology for each site that you are working on.
00:40
Get this wrong and it could spell disaster.
00:43
Your model could predict no flooding but the
00:46
reality might be a completely different story.
00:49
Remember
00:50
different rainfall theories will predict different rainfall levels,
00:54
which rainfall theory you use is completely dependent
00:57
on your project location and approving authorities.
01:01
This example is representative of a location in the
01:04
UK where there are two established rainfall theories.
01:08
Fs are flood studies report and F E H flood estimation, handbook
01:14
info, drainage, has these theories embedded
01:18
th is the more modern and is generally recommended but it does
01:22
need input parameters to be purchased via the th web service.
01:27
Fs our rainfall is therefore often used for
01:30
training purposes because there is no extra cost.
01:34
There are two separate stages to the design process.
01:38
Stage one is to design for a no surcharge criteria
01:41
in which the pipes must not become more than full
01:44
and there is always a free surface within the pipe
01:46
because the pipe capacity is greater than the flow rate.
01:50
This is tested by a steady state calculation for a one in one year storm,
01:54
or at most a one in five year storm.
01:58
Stage two is conducted for a higher return period storm,
02:01
typically one in 30 years
02:04
at this stage, a fully dynamic volumetric simulation is required.
02:08
The pipes can surcharge, but the manholes must not flood.
02:13
Ultimately,
02:14
the goal is to produce a system that passes both the stage one and stage two tests.
Video transcript
00:03
for drainage designs to be valid in the U. K.
00:06
They generally have to comply with the methodology
00:08
set out in the design and construction guidance
00:11
cG
00:12
formerly known as sewers for adoption.
00:16
That means they have to meet two criteria.
00:18
No surcharge and no flood
00:22
pipes have to be sized adequately and effective storage solutions need to be built
00:27
to do that.
00:28
It is vital to understand and accurately
00:30
represent the inflows entering a drainage network.
00:34
This makes it very important to use the right rainfall
00:37
methodology for each site that you are working on.
00:40
Get this wrong and it could spell disaster.
00:43
Your model could predict no flooding but the
00:46
reality might be a completely different story.
00:49
Remember
00:50
different rainfall theories will predict different rainfall levels,
00:54
which rainfall theory you use is completely dependent
00:57
on your project location and approving authorities.
01:01
This example is representative of a location in the
01:04
UK where there are two established rainfall theories.
01:08
Fs are flood studies report and F E H flood estimation, handbook
01:14
info, drainage, has these theories embedded
01:18
th is the more modern and is generally recommended but it does
01:22
need input parameters to be purchased via the th web service.
01:27
Fs our rainfall is therefore often used for
01:30
training purposes because there is no extra cost.
01:34
There are two separate stages to the design process.
01:38
Stage one is to design for a no surcharge criteria
01:41
in which the pipes must not become more than full
01:44
and there is always a free surface within the pipe
01:46
because the pipe capacity is greater than the flow rate.
01:50
This is tested by a steady state calculation for a one in one year storm,
01:54
or at most a one in five year storm.
01:58
Stage two is conducted for a higher return period storm,
02:01
typically one in 30 years
02:04
at this stage, a fully dynamic volumetric simulation is required.
02:08
The pipes can surcharge, but the manholes must not flood.
02:13
Ultimately,
02:14
the goal is to produce a system that passes both the stage one and stage two tests.
It is very important to use the right rainfall methodology for each site that you are working on. Pipes have to be sized adequately, and effective storage solutions need to be built. To do that, it is vital to understand and accurately represent the inflows entering a drainage network.
For drainage designs to be valid in the UK, they must comply with Design and Construction Guidance, DCG (formerly known as Sewers for Adoption). They must meet 2 criteria: no-surcharge and no-flood.
Use the correct rainfall methodology for the site:
Stage 1 of the design process:
Stage 2 of the design process:
How to buy
Privacy | Do not sell or share my personal information | Cookie preferences | Report noncompliance | Terms of use | Legal | © 2025 Autodesk Inc. All rights reserved
Sign in to start learning
Sign in for unlimited free access to all learning content.Save your progress
Take assessments
Receive personalized recommendations
May we collect and use your data?
Learn more about the Third Party Services we use and our Privacy Statement. May we collect and use your data to tailor your experience?
Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.