If future classes wants to modify and probably increase the water pressure without using an electrical water pump: build a higher tower alternatively place the tower further up on the hill. By using a longer water hose between the water tank and the valve, you will be able to put the tower higher up and further away from the garden.
By increasing the water pressure down at the valve, you will save energy (by using gravitational force instead of electrical energy for an electrical pump). Higher pressure makes it easier to supply more cultivation boxes with water.
If future classes wants to modify and probably increase the water pressure without using an electrical water pump: build a higher tower alternatively place the tower further up on the hill. By using a longer water hose between the water tank and the valve, you will be able to put the tower higher up and further away from the garden.
By increasing the water pressure down at the valve, you will save energy (by using gravitational force instead of electrical energy for an electrical pump). Higher pressure makes it easier to supply more cultivation boxes with water.