According to product specification, water inlet is shown at 290mm from base.
(1)If the top of concrete base is set at 20mm below inlet, the pipe embedment into concrete base will be 270mm (I.e. 290-20). Is this correct?(2)The recommended depth of concrete base is approx 400mm. If the inlet pipe is 300mm below ground, the depth of required hole for the base

should be 720mm (I.e. 300+20+400). Is this correct? Please comment.
Regards,
Suresh