Question Bank • QB_EXP_SWCE_WSH_002 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Watershed Management & Rainwater Harvesting

Subtopic: Horton stream order and bifurcation ratio

Question Statement:

According to Horton-Strahler stream ordering, when two 2nd-order stream channels join, the resulting downstream channel order is:

Options:

  • (A) 3rd order
  • (B) 4th order
  • (C) 2nd order
  • (D) 1st order

Answer Key:

A

Step-by-Step Solution & Explanation

In Strahler stream ordering: - Two streams of order $u$ joining form a downstream channel of order $u + 1$. - Hence, two 2nd-order streams joining form a 3rd-order stream. (Note: if a stream of order $u$ joins a stream of order $v$ with $u < v$, the downstream order remains $v$).
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