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In theory the idea will work (as long as the dynamic hydraulic grade line does not rise to more than 60m above the pipe at any point).

However, in future someone may need to repair the lower tank and so may wish to stop the flow into it. Since there will be no valve at the inlet then you will need to ensure that there is a valve that can be closed at the outlet to the collection point at the spring (this valve will also be necessary to allow repair to the pipe). There should also be an air-admittance pipe just downstream of this valve to stop suction developing in the pipe when the valve is closed and the pipe is draining (see Figure 11.6 in Jordan's book).

Regards

Brian Skinner

In theory the idea will work (as long as the dynamic hydraulic grade line does not rise to more than 60m above the pipe at any point).

However, in future someone may need to repair the lower tank and so may wish to stop the flow into it. Since there will be no valve at the inlet then you will need to ensure that there is a valve that can be closed at the outlet to the collection point at the spring (this valve will also be necessary to allow repair to the pipe). There should also be an air-admittance pipe just downstream of this valve to stop suction developing in the pipe when the valve is closed and the pipe is draining (see Figure 11.6 in Jordan's book).

Regards

Brian Skinner Brian