![Exercise [5]<br>A system of pipe drains of (0.2m in diameter) are used to drainage<br>area, the drains are located (1.8m) below ground surface. The<br>impervious layer about 6.8m from ground surface, k=1.0 m/day. The<br>successive irrigations are every 20 days, deep percolation losses<br>toward water table (W.T) are 40mm/irrigation. Determine the spacing<br>between drains.<br>(1) To maintain W.T level of 0.8m.<br>(2) To maintain W.T level of 1.2m.<br>](https://s3.us-east-1.amazonaws.com/storage.unifolks.com/qimg-008/008_atvqzz0-t2slm2nz.jpeg)
Extracted text: Exercise [5] A system of pipe drains of (0.2m in diameter) are used to drainage area, the drains are located (1.8m) below ground surface. The impervious layer about 6.8m from ground surface, k=1.0 m/day. The successive irrigations are every 20 days, deep percolation losses toward water table (W.T) are 40mm/irrigation. Determine the spacing between drains. (1) To maintain W.T level of 0.8m. (2) To maintain W.T level of 1.2m.