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===Spacing drain pipe===
→Spacing drain pipe
==Spacing drain pipe==
<math>Drain\ spacing=\sqrt{\frac{8K_{soil}\left(D_{i}-D_{d}\right)\left(D_{d}-D_{w}\right)+4K_{soil}\left(D_{d}-D_{w}\right)^{2}}{q}}</math>
<math>Drain\ spacing=\sqrt{\frac{8K_{soil}\left(D_{i}-D_{d}\right)\left(D_{d}-D_{w}\right)+4K_{soil}\left(D_{d}-D_{w}\right)^{2}}{q}}</math>
==Recommendations for material specifications==
==Recommendations for material specifications==