Which of the following statements regarding biodrainage and non-conventional drainage techniques are correct?
Options:
(A) Biodrainage utilizes deep-rooted, fast-growing, high-transpiring tree species (such as *Eucalyptus*) to lower shallow water tables.
(B) Biodrainage avoids producing saline drainage effluent that requires off-site disposal into surface water bodies.
(C) Interceptor drains are installed along the base of hillside slopes to intercept seepage water before it reaches valley agricultural lands.
(D) Biodrainage completely eliminates root-zone salt accumulation without requiring occasional leaching.
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
• Biodrainage uses high-water-consuming tree plantations as biological pumps to depress water tables (A is correct).
• It removes water via transpiration, avoiding saline liquid effluents (B is correct).
• Interceptor drains cut off lateral groundwater inflow from higher elevations (C is correct).
• Plants transpire pure water while excluding salts, so salts accumulate in the bio-drainage root zone over time; thus D is incorrect.