Area of cross section times length In your case a circle (so in your case 3.142xradiusxradiusxlength). If all your measurement are in cm, then divide by 1000 to get litres. 3.142x195x7.5x7.5/1000=34.5 litres. I am assuming your 150mm round means a radius of 7.5cm.
-- Edited by Hewy54 on Monday 30th of April 2018 09:58:38 PM
G'day Bowser, I wonder if you are using uPVC pipe, better known as plastic. It would normally be 160mm outside, stormwater grade has a around 3mm wall so inside would be 154mm, so from memory around 19 litres per metre, or redo the formula osted above. Any way a bit more capacity for you.
Use the "Search" button for Grey Water Storage or Grey Water Tanks and you will find holding capacity and photo's of a system that has now been in place for 4+ years.
Can be cleaned out with a karcher high pressure water cleaning unit. It is sewerage grade 185 x 150ml from memory. No back flows/no smells and empty in to dump point. Travel with caps off to air the system.
