Thank you guys for answering ...
Published by Hung Bui, Graduate Student. 1-year experience in water and wastewater sectors.
Thank you guys for answering me and sorry for any missing/confusing information. I have updated my post. Basically, there are two questions:
1. Are only the average flow and maximum flow adequate for calculating the equalization basin ( as I know from an exercise, 24-h flow record is needed).
2. Should I pick the average or the maximum contaminants concentration for calculation?