area is unsuitable for excavation of trenches natural or artificial depressions exist the water table is near the surface adequate depth of cover material is available at the site
Answer Discuss in Comment
"Scientists dream about doing great things. Engineers do them."
PSC Advertisement ⏩ | Federal PSC | Bagmati PSC | PSC Karnali | PSC Lumbini | PSC Sudurpaschim | PSC Gandaki | PSC State 1.