Calculate which is the right water pump for you! Blake Hydram Calculator Please Click Here For the Blake Hydram Calculator Litres per Minute To calculate the litres per minute available, view the Blake Hydram Installation page. Working Fall This is the distance between the drive water and the blake hydram pump. If unsure, view the Blake Hydram Installation page. Vertical Height This is the distance between the blake hydram pump and where you require the water to be pumped to.