CHAPTER FOUR: DRAINAGE & DESIGN OF DRAINAGE SYSTEMS. 4.1 INTRODUCTION. Drainage means the removal of excess water from a given place. Two types of drainage can be identified:
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This is chosen from experience depending on rainfall. The following are guidelines.
L is drain spacing; h is mid drain water table height (m) above drain level; Do is depth of aquifer from drain level to impermeable layer(m); q is the water input rate(m/day) = specific discharge or drainage coefficient; K is hydraulic conductivity(m/day); H is the depth to water table.