Precipitation MCQ with answer and solution

Concept

Rain gauge network density standards and norms

Formula

NONE

Step-by-step solution

1. Standard hydrological guidelines specify minimum density recommendations for rain gauge networks in various terrains. 2. In flat plain areas, 1 rain gauge station per 500 km² is considered sufficient for accurate mean basin precipitation estimation. 3. Therefore, statement i is correct. Answer: C

Explanation

Standard meteorological guidelines specify rain gauge network densities based on terrain characteristics. For flat plain regions, a density of 1 station per 500 square kilometers is recommended, while for moderately elevated regions around 1000 meters elevation, the required density increases to 1 station per 250 to 400 square kilometers. Since both statements accurately reflect these standard station density requirements, option C is correct.

Why the other options are wrong

B) Statement (ii) gives incorrect density norms for elevated regions under standard guidelines. D) Statement (i) is true as per standard rain gauge network recommendations for plains.

Shortcut

Rain gauge density: Plains = 1 per 500 km²; Moderate elevation = 1 per 250–400 km².

Common mistake

Selecting option A or B by assuming one of the standard rain gauge density requirements for plains or elevated regions is false.