Neco 2021 Geography Question 15
Practice objective / multiple choice question 15 from the 2021 Neco Geography examination.
A soil has a hydraulic conductivity \(K = 2\) cm day\(^{-1}\). The impermeable layer lies 150 cm below the ground surface, and tile drains are to be installed with their centre at 70 cm depth. The desired steady‑state drainage rate is \(q = 0.1\) cm day\(^{-1}\) and the target water‑table depth is 80 cm below the surface. Using Hooghoudt's equation \(L = \sqrt{\dfrac{8KD(D-d)}{q}}\), where \(D\) is the depth to the impermeable layer and \(d\) is the drain depth, calculate the recommended spacing \(L\) between adjacent drains (in metres, rounded to the nearest metre).
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About This Question
This is Neco 2021 Geography Question 15. It is one of the objective questions from the 2021 Neco Geography examination.
Difficulty level: Medium .
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