EngineeringSurya · Class 2-3
Baandh ki deewar neeche se moti kyun?
Kabhi socha hai? Riya ne kitaab mein ek bade baandh ki photo dekhi. Deewar neeche se itni moti thi jaise pahaad, aur upar sadak jitni patli. 'Engineer ne paise bachane ke liye upar patli banayi kya?' Riya ne poochha.
Socho pehle… phir dekho jawab
Nahi! Paani gehrai ke saath zyada dabata hai. Upar dhakka kam, neeche sabse zyada. Isliye engineer deewar neeche moti banate hain — jahan zor zyada, wahan taakat zyada.
Baandh nadi ke aar-paar ek majboot deewar hai. Peeche paani jama hota hai — use jalashay (reservoir) kehte hain. Isse kheton ko sinchai, logon ko peene ka paani, aur bijli milti hai.
Kadi: paani gehra hua, phir neeche dabaav badha, phir deewar ke neeche zyada dhakka laga, isliye engineer ne neeche moti deewar banayi. Upar zor kam, toh upar patli deewar se kaam chal jaata hai — aur patthar-cement bhi bachta hai.
Baandh mein paani nikalne ke darwaze (gate) bhi hote hain. Jab jheel bahut bhar jaaye, toh engineer dheere-dheere paani chhodte hain, taaki deewar par zyada bojh na pade.
Humne kya kiya :- Baandh ki photo dekhi aur deewar ki shape ko paani ke dabaav se joda.
Isse kya hua :- Samjhe ki engineer zor dekh kar shape chunte hain: neeche zyada zor, isliye neeche moti deewar.
Ghar pe try karo
Bade ke saath thaali mein gili mitti se do baandh banao: ek seedha patla (jaise kitaab khadi ho), ek tikona (neeche chauda). Dono ke peeche ek jaisa paani dheere daalo. Kaunsa pehle toota ya risne laga? Copy mein chitra banao.
Wow!
Tamil Nadu mein Kaveri nadi par Kallanai naam ka patthar ka baandh 2,000 saal se bhi purana hai aur aaj bhi paani sambhalta hai!
Mummy-Papa ke liye
Aaj bachche ke saath thaali mein do mitti ke baandh banaiye — patla aur tikona — aur poochhiye: 'Tikona zyada der kyun tika?'
3 sawaal
- Baandh ki deewar neeche se moti kyun hoti hai?
Jawab dekho
Neeche paani sabse zyada dabata hai. Paani ka dabaav gehrai ke saath badhta hai, isliye neeche ki deewar moti chahiye.
- Baandh ke peeche jama paani ko kya kehte hain?
Jawab dekho
Jalashay (reservoir). Baandh ke peeche jama paani jalashay ya reservoir kehlata hai.
- Kallanai baandh kis nadi par hai?
Jawab dekho
Kaveri. Kallanai (Grand Anicut) Tamil Nadu mein Kaveri nadi par patthar ka baandh hai.
NCERT se jodo: NCERT Class 3 — paani kahan se aata hai aur hum use kaise jama karte hain (idea in words)