rajshekar

  • When the foundation stone for the Kosi embankment was laid on January 14, 1955, near Nirmali in Saharsa district in Bihar, euphoric people shouted, Aadhi roti khayenge, Kosi bandh banayenge (we will eat only half a chapati but we will surely build the embankment), writes the prolific engineer and ac...
    rajshekarposted 9 years 7 months agoread more
  • A twist on RWH : fogwater harvesting in Nepal:Read More
    rajshekarposted 10 years 1 month agoread more
  • To measure how fast water percolates into the soil, you need to measure the time it takes for a specific amount of water to soak into a specific area of soil. The easiest way to do this is to get a length of cylindrical pipe that is sharp enough to push (or hammer) into the soil at one end. Mark it ...
    rajshekarposted 10 years 2 months agoread more
  • You can measure slope by making use of gravity. Find a protractor for measuring angles. Attach a straw across the straight edge of the protractor. From the very middle of the straight edge, attach a string with a small weight on the end. To measure slope, ask a friend to help. Identify a point on yo...
    rajshekarposted 10 years 2 months agoread more
  • The first project was conducted by the BAIF Development Research Foundation in the Hassan District of Karnataka. They created a linked network of 350 farm ponds covering 700 hectares of the watershed. All of the ponds were 3 meters deep and between 6 and 9 meters in length and width. They were conne...
    rajshekarposted 10 years 2 months agoread more
  • The ideal farm pond should be dug into the ground in a naturally low-lying area. Some of the soil that is removed can be used to construct an earthen berm around the pond, which should be planted with trees and grasses for stability. The shade and wind protection provided by the raised mound and veg...
    rajshekarposted 10 years 2 months agoread more
  • Where conditions are favorable, it is better to recharge the groundwater than to create surface ponds for storage. This approach minimizes evaporative losses, and often improves water quality. Recharge structures can be anything from a small pit simply dug into the soil, to a borewell converted for ...
    rajshekarposted 10 years 2 months agoread more
  • Where possible, it is much more cost effective to restore existing tanks, than to build new tanks. Restoration can involve silt removal to increase the storage capacity of the tank and reduce evaporative loss. The silt can be used to restore the earthen bund, and any remaining silt can be applied to...
    rajshekarposted 10 years 2 months agoread more
  • If the intention is to develop a tank by holding back a large amount of water, then the dam must be carefully designed (with the assistance of experienced local people or engineers).The outflow from the dam must be thoughtfully positioned and designed in order to regulate the quantity of flow and th...
    rajshekarposted 10 years 2 months agoread more
  • In addition to controlling gully erosion, check dams also serve to slow the movement of water, allowing increased percolation into the soil. Just above a check dam is a good place to put in a percolation structure. Silt that builds up behind the dam creates good farmland, which can be planted after ...
    rajshekarposted 10 years 2 months agoread more
  • Over the years, unchecked soil erosion can lead to the formation of deeper and deeper gullies. There are several methods for controlling gully erosion, which can be chosen depending on the materials available. If it is a small gully, vegetation can be planted in strips across the gully to slow ...
    rajshekarposted 10 years 2 months agoread more
  • These techniques are useful to slow runoff and erosion from sloping land, and also to revegetate degraded areas. Areas with high rainfall, steep slopes, and thin soils should use slightly graded bunds / terraces / trenches to allow some drainage.Contour TrenchesAbove an 8% slope, contour trenches ar...
    rajshekarposted 10 years 2 months agoread more
  • Bunds have many benefits, including marking the boundaries of farm-holdings, slowing the movement of soil and water, and providing a place for integrating trees into agricultural systems. Here are some tips for using bunds within farmland:Cattle should be kept away from the area while establishing s...
    rajshekarposted 10 years 2 months agoread more
  • In places where the land is too degraded for agriculture and the soil is too shallow for bunding, rocks can be used to protect existing stumps from browsing and allow regeneration. Rock fences can also be used to protect areas planted with fodder species. Hardy, drought tolerant trees such as neem, ...
    rajshekarposted 10 years 2 months agoread more
  • It is similar to drip irrigation, but less expensive to install. The pitchers are the round earthen containers used in rural areas for water storage, ranging from 10 to 20 liters in capacity. This kind of irrigation is ideal for spreading plants such as gourd, pumpkin, and melon because few pitchers...
    rajshekarposted 10 years 2 months agoread more
  • The site has sections detailing the methodology of SRI, its advantages, origins, current status in countries across the world, videos, articles, research papers, extension information, conference outputs, discussion communities, update series, newsletters and more.See the homepage: Hereetup in 1990,...
    rajshekarposted 10 years 2 months agoread more
  • This government order on the rainwater harvesting website of Centre for Science and Environment makes rainwater harvesting  mandatory in all Municipal Corporations, Urban Development Authorities and Municipalities, buildings with an area of 300 sq m or more in Andhra Pradesh. Tentative date for...
    rajshekarposted 10 years 2 months agoread more
  •   Open wells have a major role to play in the artificial recharge of groundwater. Rooftop rainwater and surface water flowing in storm water drains can be filtered; the silt removed and allowed to recharge the open wells.If you are building on a new site do not forget to consider digging an op...
    rajshekarposted 10 years 2 months agoread more
  • Seven easy steps to constructing a recharge pitRead MoreThe making of a recharge wellRead MoreYou can recharge your borewell tooRead MoreA detailed description of how to build filters for rainwater to make it safe for consumptionRead MoreDomestic rainwater harvesting made easyRead MoreWebsite of Rai...
    rajshekarposted 10 years 2 months agoread more
  • OverviewRainwater is amongst the purest water one can get distilled as it is by the sun. However, in a rainwater harvesting system, the water comes in contact with several surfaces, such as the roof or gutters. Its flow becomes possibly mixed with leaves or dust.To get water fit for use at the end o...
    rajshekarposted 10 years 2 months agoread more

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This article voices the agitation of the people of Saharsa District in Bihar for building an embankment on the Kosi River, which destroyed many people and property in the 2008 flood.

When the foundation stone for the Kosi embankment was laid on January 14, 1955, near Nirmali in Saharsa district in Bihar, euphoric people shouted, Aadhi roti khayenge, Kosi bandh banayenge (we will eat only half a chapati but we will surely build the embankment), writes the prolific engineer and activist Dinesh Mishra in his book, “ Trapped! Between the Devil and the Deep Waters.” No one really paid any attention to the protests and the fears of the people who would live with these embankments and what would happen to their lives.

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Fogwater harvesting in Nepal

A twist on RWH : fogwater harvesting in Nepal:

Read More

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An easy on the field method to calculate water percolation rate

To measure how fast water percolates into the soil, you need to measure the time it takes for a specific amount of water to soak into a specific area of soil. The easiest way to do this is to get a length of cylindrical pipe that is sharp enough to push (or hammer) into the soil at one end. Mark it with two lines – one is the line to which you insert it into the soil, and the other is the line to which you fill the water.

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A brief on how to measure slope by making use of gravity with a protractor and a straw

You can measure slope by making use of gravity. Find a protractor for measuring angles. Attach a straw across the straight edge of the protractor.

Topics

Sub-Categories

Regions

Two examples of a watershed scale application of rainwater harvesting techniques.

The first project was conducted by the BAIF Development Research Foundation in the Hassan District of Karnataka. They created a linked network of 350 farm ponds covering 700 hectares of the watershed.

Topics

Sub-Categories

Regions

Details on how to make a farm pond

The ideal farm pond should be dug into the ground in a naturally low-lying area. Some of the soil that is removed can be used to construct an earthen berm around the pond, which should be planted with trees and grasses for stability. The shade and wind protection provided by the raised mound and vegetation will reduce evaporative losses.

Topics

Sub-Categories

Regions

A brief on groundwater recharge structures

Side view of a simple soil pitWhere conditions are favorable, it is better to recharge the groundwater than to create surface ponds for storage. This approach minimizes evaporative losses, and often improves water quality. Recharge structures can be anything from a small pit simply dug into the soil, to a borewell converted for recharge. Recharge structures are useful in sloping landscapes where the water would not otherwise have time to sink into the ground before running off.

Topics

Sub-Categories

Regions

Restoration of tanks- More cost effective that building new ones

Where possible, it is much more cost effective to restore existing tanks, than to build new tanks. Restoration can involve silt removal to increase the storage capacity of the tank and reduce evaporative loss. The silt can be used to restore the earthen bund, and any remaining silt can be applied to nearby farmland. The outflow structure can also be improved. Care should be taken during silt removal not to expose highly permeable soils, which would lead to excessive seepage loss (unless the goal is to increase infiltration).

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A write up on building tanks for water conservation and storage

If the intention is to develop a tank by holding back a large amount of water, then the dam must be carefully designed (with the assistance of experienced local people or engineers).

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Regions

A series of pictures that show one farmer’s success with building a percolation tank just upstream of a series of check-dams.

In addition to controlling gully erosion, check dams also serve to slow the movement of water, allowing increased percolation into the soil. Just above a check dam is a good place to put in a percolation structure. Silt that builds up behind the dam creates good farmland, which can be planted after the rains while it retains moisture. The following series of pictures show one farmer’s success with building a percolation tank just upstream of a series of check-dams.

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