Canal Losses - Canal Head Works and Distribution System - Water Resources Engineering 2

TL;DR

This video discusses the different types of losses that occur in canals, such as evaporation and percolation, and explores preventive measures.

Transcript

in this video we are going to study the losses that are occurred in the canal so basically the losses in canal comprise evaporation from the surface and the seepage through the bed and size of the train so the two major losses are evaporation and percolation that will be occurred throughout the site flows and the base channel of the canal so genera... Read More

Key Insights

• 🔸 Evaporation losses in canals are generally small and negligible, usually ranging from 1 to 5 percent.
• 🥺 Seepage losses depend on groundwater table position, with shallow levels leading to more seepage and waterlogging.
• 🌸 Soil properties, such as permeability and the presence of absorbing medium, also affect seepage losses.
• 🌸 Canal depth and water velocity impact water losses, with greater depth and lower velocity resulting in more loss.
• 💦 Physical properties of canal water, like temperature and silt content, affect the extent of losses.
• 😚 Canal losses can be expressed in different ways, such as cubic per million square meters of wetted perimeter or depth lost over the wetted perimeter area.
• 💦 Preventive measures for canal losses include maintaining a high water level, closing outlets, and using canal design that minimizes seepage.

Questions & Answers

Q: What are the two major losses in canals?

The two major losses in canals are evaporation from the water surface and seepage through the bed and sides of the canal.

Q: Can evaporation losses be prevented?

Evaporation losses cannot be entirely prevented due to climatic conditions, but there are methods to minimize them, although they can be time-consuming.

Q: What factors affect the extent of seepage losses?

The position of the groundwater table, soil porosity, subsoil permeability, and the extent of absorbing medium in the canal section all affect the extent of seepage losses.

Q: How can canal losses be measured?

Canal losses can be measured using the inflow and outflow method, where the difference between the entering and leaving discharge is calculated.

Summary & Key Takeaways

• Evaporation and percolation are the main types of losses in canals.

• Evaporation losses depend on climatic conditions, and though they can't be prevented, they are usually negligible.

• Seepage losses depend on groundwater table position, soil properties, and canal design.