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I'm Redesigning a sewer network and treatment system for a remote orphanage.

I need support to evaluate the minimum gradient for 100, 150 and 200mm diameter pipes.

I have worked out the corresponding gradients of 0.012, 0.006 and 0.004.

I need to know if these are acceptable for normal pipes ks factor 3, or if I need to secure pipes with lower ks factors.

Furthermore, I have planned for basic primary treatment and secondary treatment.

This comprises of three tanks each one having a one day’s retention time.

The first two tanks are for primary settlement while the next is for secondary anaerobic processing. Is this acceptable?

I'm Redesigning a sewer network and treatment system for a remote orphanage.

I need support to evaluate the minimum gradient for 100, 150 and 200mm diameter pipes.

I have worked out the corresponding gradients of 0.012, 0.006 and 0.004.

I need to know if these are acceptable for normal pipes ks factor 3, or if I need to secure pipes with lower ks factors.

Furthermore, I have planned for basic primary treatment and secondary treatment.

This comprises of three tanks each one having a one day’s retention time.

The first two tanks are for primary settlement while the next is for secondary anaerobic processing. Is this acceptable?

Regards, Stephen

I'm Redesigning a sewer network and treatment system for a remote orphanage.

I need support to evaluate the minimum gradient for 100, 150 and 200mm diameter pipes.

I have worked out the corresponding gradients of 0.012, 0.006 and 0.004.

I need to know if these are acceptable for normal pipes ks factor 3, or if I need to secure pipes with lower ks factors.

Furthermore, I have planned for basic primary treatment and secondary treatment.

This comprises of three tanks each one having a one day’s retention time.

The first two tanks are for primary settlement while the next is for secondary anaerobic processing. Is this acceptable?

Regards, Stephen