Chapter 6 of 12
Revision Notes
Development of Watershed Area — Revision Notes
Maharashtra Board · Class 10 · Water Security
Development of Watershed Area revision notes for Maharashtra Board Class 10 Water Security: 4 topics in quick points.
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Key Topics to Revise
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1. Watershed Area: Meaning and Planning
- Watershed area means the whole area where water naturally flows from mountains through small streams and a nallah.
- Such an area can range from 50 hectares to 500 hectares or more, depending on land elevation.
- Watershed area development should first prioritize small watershed areas selected according to geographical location.
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2. Continuous Contour Trenches and Planting on Hill Slope
- Continuous Contour Trenches are dug according to the slope of the land to block rainwater and make it seep into the soil.
- If the slope of the land is high, the trenches should be dug nearer together.
- If the slope is low, the trenches can be dug at a longer distance apart.
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3. Loose Boulder Structure
- Loose Boulder structures are small stone causeways laid one below the other along the stream slope to block flowing water.
- The base level of the upper causeway should equal the head level of the lower causeway.
- The height of such dams or causeways should be kept up to 2 meters depending on the slope of the land.
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4. Nala Embankment or Nala Bunding
- Nala bunding uses earthen or cement causeways across a nala to block and store rainwater flow.
- If an earthen causeway or dam is constructed, the maximum height should be 4 meters.
- Black soil should be filled at the bottom of the nala base to prevent seepage.
Get complete notes with diagrams and examples
Full NotesKey Concepts
A watershed area is the wholeA full survey of the areaCCT trenches are dug accordingSmall stone causeways are placed oneEarthen or cement causeways are built
Frequently Asked Questions
What are the important topics in Development of Watershed Area for Maharashtra Board Class 10 Water Security?
Key topics in Development of Watershed Area include Watershed Area: Meaning and Planning, Continuous Contour Trenches and Planting on Hill Slope, Loose Boulder Structure, Nala Embankment or Nala Bunding. Study these first, then practise questions on each for the Maharashtra Board Class 10 board exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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