Gce Model Questions Vol1 2018 Geography Question 9
Practice objective / multiple choice question 9 from the 2018 Gce Model Questions Vol1 Geography examination.
A field rests on a homogeneous soil with hydraulic conductivity \(K = 2.0\times10^{-5}\,\text{m\,s}^{-1}\). The impermeable layer lies at a depth \(D = 2.0\) m below the surface. The design requires that the steady‑state rise of the water table above the impermeable layer not exceed \(H = 0.8\) m. Using Hooghoudt's equation for parallel tile drains spaced a distance \(L\) metres apart,\n\[\nq = \frac{4K H\,(2D+H)}{L^{2}},\n\]\nwhere \(q\) is the discharge per unit length of drain. If each drain can safely convey a maximum discharge of \(q_{\max}=1.5\times10^{-4}\,\text{m}^{3}\text{s}^{-1}\) per metre of drain, calculate the maximum allowable spacing \(L\) (in metres) between drains.
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About This Question
This is Gce Model Questions Vol1 2018 Geography Question 9. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Geography examination.
Difficulty level: Medium .
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