ব্যাখ্যা: When a fluid, such as air or liquid, is heated and then travels away from the source, it carries the thermal energy along. This type of heat transfer is called convection.

flood hydrograph হল কোন স্থানের বৃষ্টিপাতের পরিমাণ ও নির্গমণের একটি গ্রাফিক্যাল উপস্থাপনা। flood hydrograph element 3 টি: Rising limb. Falling limb, Base flow or peak flow উত্তর সহ কয়েকটি অনুরূপ গুরুত্বপূর্ণ প্রশ্ন 1. The quantity of water retained by the sub-soil against gravity, is known-Specific retention 2. To determine the discharge at a section in a stream from its rating curve, the required data are- stage at the section. 3. In the derivation of Thiem's formula, Q (SI- S2)/[2.3 log10(/)] the following assumption is not applicable-The well has been sunk up to the surface of the unconfined aquifer. 4. The peak of a 4 hour flood hydrograph is 240 m3 /sec. If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, peak of 4hours unit hydrograph will be 25 m3/sec. 5. For the estimate of high floods in fan-shaped catchment, the formula used is - Inglis formula

ব্যাখ্যা: An impulse turbine is used for high head hydroelectric power plants