Deear All,
Thank you for the contributes;
the problem was a real gardening problem, however data are not available;
If you like, consider the following pump as reference:
Output: 1 HP,
Outlet: 2"
Rated: H 7.5 (M), Q 220 (L/M)
Maximum: H 12 (M), Q 450 (L/M)
Dimension: 350 L x 162 W x 180 H (mm)
Weight: 11 Kgs
Thanks again for the help, best regards