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How long does it take to complete a drainage design?

July 10, 20242 min read

𝗛𝗼𝘄 𝗹𝗼𝗻𝗴 𝗱𝗼 𝘆𝗼𝘂 𝘁𝗵𝗶𝗻𝗸 𝗶𝘁 𝘁𝗮𝗸𝗲𝘀 𝘁𝗼 𝗰𝗼𝗺𝗺𝗶𝘀𝘀𝗶𝗼𝗻 𝗮𝗻𝗱 𝗰𝗼𝗺𝗽𝗹𝗲𝘁𝗲 𝗮 𝗱𝗿𝗮𝗶𝗻𝗮𝗴𝗲 𝗱𝗲𝘀𝗶𝗴𝗻?
𝗗𝗼 𝘆𝗼𝘂 𝗿𝗲𝗮𝗹𝗹𝘆 𝘁𝗵𝗶𝗻𝗸 𝘆𝗼𝘂 𝗰𝗮𝗻 𝘀𝘁𝗮𝗿𝘁 𝗹𝗮𝘆𝗶𝗻𝗴 𝗽𝗶𝗽𝗲𝘀 𝗻𝗲𝘅𝘁 𝘄𝗲𝗲𝗸?

The process is much longer than you think - the steps are outlined below

𝗦𝘁𝗲𝗽 𝟭, 𝗧𝗵𝗲 𝗗𝗶𝘀𝘤𝗼𝘃𝗲𝗿𝘆 𝘤𝗮𝗹𝗹
This is to find out what you trying to achieve - are you looking for a detailed drainage design, are you looking for help with your planning application or are you just interested in finding out what is possible.

𝗦𝘁𝗲𝗽 𝟮, 𝗧𝗵𝗲 𝗣𝗿𝗼𝗽𝗼𝘀𝗮𝗹
Once we know what you would like to achieve, we can then create a proposal for you, which will outline the costs and time it should take to complete you design.
The proposal may take us a week to create. In that time we are looking at all of the available information, which you have sent to us and any other easily available information, such as what flood zone your project is in.
Typically, you will need to digest the proposal and then instruct us if you are happy with the proposal and this usually takes 3-4 weeks.

𝗦𝘁𝗲𝗽 𝟯, 𝗦𝘁𝗮𝗿𝘁𝗶𝗻𝗴 𝘄𝗼𝗿𝗸
Once you have instructed us to proceed, we can schedule your project into our calendar. We can also start inviting quotes from suitable surveying companies for whatever surveys are required, such as a topo survey, CCTV survey or general site survey.
Once we have a minimum of 3 quotes, we will submit them to you for approval.
When you have approved the company we recommend we can instruct them to carry out the survey
You need to appreciate that we cannot really start out drainage design until we have the results of these surveys, which may take up to 4 weeks to receive.

𝗦𝘁𝗲𝗽 𝟰, 𝗧𝗵𝗲 𝗱𝗲𝘀𝗶𝗴𝗻
Once we have the information we need, we can carry out the actual drainage design, which may take up to 2 weeks to complete. At the end of the design period we can submit our proposals to the Lead Local Flood Authority (LLFA) for approval.
The LLFA has a statutory right to take up to 21 days to review the proposal and approve it if they are happy with it. The may ask us to make some minor amendments.

So, just to summarise, it may take up to 12 weeks to complete and gain approval for a drainage design, so starting next week is definitely not possible.
The moral of the story is - talk to your drainage designer as soon as possible - any lack of approval from the LLFA will stop your work on site.

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