Waec Model Questions Vol1 2020 Geography Question 15
Practice objective / multiple choice question 15 from the 2020 Waec Model Questions Vol1 Geography examination.
A farmland requires tile drainage to keep the water table at least 0.8 m below the soil surface. The soil hydraulic conductivity is 10 mm h⁻¹, the recharge (excess rainfall) rate is 5 mm h⁻¹, the impermeable layer lies at a depth of 2.0 m, and the tile drains are installed at a depth of 0.6 m. Using the simplified Hooghoudt equation \( S = \sqrt{\dfrac{8 K D_e}{q}} \) where \(S\) is the drain spacing (m), \(K\) is hydraulic conductivity (m h⁻¹), \(q\) is the recharge rate (m h⁻¹) and \(D_e\) is the equivalent depth approximated by \( D_e = \dfrac{D - d}{2} \), determine the maximum allowable spacing between drains. Give your answer in metres, rounded to one decimal place.
Answer Options
About This Question
This is Waec Model Questions Vol1 2020 Geography Question 15. It is one of the objective questions from the 2020 Waec Model Questions Vol1 Geography examination.
Difficulty level: Medium .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.