Calculate water volume in site drain system

Job ID: 32796385

Budget: $30 – $250 AUD

I need someone to calculate the total volume of water that could be held in our sites drains on the basis of a shut off valve being installed at the front of the facility.

So in theory, if there was a fire on our site, we would shut off any water leaving the site (to avoid contaminated water entering the stormwater) and allow the drains to fill up before having pump trucks come and pump out the contaminated water stored in our drainage system.

The site drainage plan is attached and we would require the freelancer to provide a basic 1 page report.

Thanks