Question Bank • QB_EXP_IDE_SRF_001 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Surface Irrigation: Border, Furrow & Basin Hydraulics

Subtopic: Maximum length of border strip

Question Statement:

A border strip receives a unit inflow rate of $q = 20\text{ L/(s}\,\text{m width)}$. The average final steady infiltration rate of the soil is $f = 54.0\text{ mm/h}$ ($0.000015\text{ m/s}$). The maximum theoretical length of border strip that can be covered by this stream is ________ $\text{m}$ (round off to one decimal place).

Answer Key:

1333.3

Step-by-Step Solution & Explanation

The maximum theoretical advance length occurs when inflow rate equals infiltration loss over the entire strip: $L_{max} = \frac{q}{f} = \frac{0.02}{1.5e-05} = 1333.3\text{ m}$
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