WATER TANK

जलशोषो भवेत्सूर्ये भौमे रिक्तं बिनिर्दिशेत्।

मन्दे च मलिनं कुर्याच्छेषा वाराः शुभावहाः।।

Should not start construction of water storage tank on Sunday,   Tuesday, and Saturday. Inadequacy of water would result if construction starts on Sunday or Tuesday and the tank would remain dirty if the work starts on Saturday. All other days are auspicious for the work.