Patrick Pierard
Civil/Environmental
- Jun 19, 2020
- 1
Hello, I am tasked with designing an open drain with rock weir stormwater attenuation design for a development. There is 1ha of additional metalled surface area being added. I have to provide stormwater attenuation for a 1 in 10 year storm event. This is a requirement from the authority to allow us to proceed with the development.
The main thing i would like help with is whether there are any relatively simple calculations (where assumptions can be made) that can demonstrate how much flow will go through the rock wall given a specified headwater depth. I have attached some links to calculations, reports and plans which can hopefully be viewed online. I did briefly do some culvert calculations but the client does not want to include any culverts. If you are kind enough to read the report I have highlighted probably the more important part and would love your feedback. I have also hidden any names and places hopefully for confidentiality.
Thank you to anyone who responds to this.
The main thing i would like help with is whether there are any relatively simple calculations (where assumptions can be made) that can demonstrate how much flow will go through the rock wall given a specified headwater depth. I have attached some links to calculations, reports and plans which can hopefully be viewed online. I did briefly do some culvert calculations but the client does not want to include any culverts. If you are kind enough to read the report I have highlighted probably the more important part and would love your feedback. I have also hidden any names and places hopefully for confidentiality.
Thank you to anyone who responds to this.