Farm Ponds Module description
Farm ponds are manmade ponds constructed for storing rainwater which could be used during scarce season to ensure lifesaving irrigation for the uninterrupted physiological activities of the crops. Farm ponds are constructed by excavating the soil, by depositing the soil on the bunds. These ponds may be lined with impermeable membrane such as HDPE sheet to avoid infiltration of water into soil. However, unlined ponds are more suitable for groundwater recharge.
The excavated ponds are generally made in relatively level regions across waterways, small gullies or to one side of them. They are preferably located in areas with impervious substratum. These ponds should be as deep as possible within the limitations of workability and pumping conditions.
Step By Step Process
- The web page will have the drop down for selecting District, Taluk, Village, Watershed name, Survey Number, Vegetative Cover and Bund Length.
- Execute query on rainfall data to get Peak Intensity Rainfall from the last 10 years.
- Execute Surface Runoff DSS using Infiltration method for the Selected Survey Number considering peak intensity rainfall.
The application decides the farm pond size on the basis of following steps
Slide Slope Consideration:
For Black Soil: 1.5:1
For Red Soil : 1:1
Depth needs to be considered as 3 m.
Top Width = √(Runoff Volume/3) +4.5 for Black soil
Top Width = √(Runoff Volume/3) +3 for Red Soil
Bottom Width = √(Runoff Volume/3) - 4.5 for Black soil
Bottom Width = √(Runoff Volume/3) - 3 for Red Soil
Top Area = Top Width * Top Length
Since its square Top width = Top Length
Bottom Area=Bottom Width*Bottom Length
Since its square Bottom width = bottom Length
Volume = (Top Area + Bottom Area)/2 * Depth
e.g
Depth of Farm Pond : 3 m
70% Surface Runoff : 1500 m3
Soil Type : Black Soil, Slide Slope consider as 1.5:1
Top Width = √(1500/3) +4.5 = 26.8608
Round off the Top width
Top Width = 27 m
Top Area = Top Width X Top Length = 27 * 27 = 729 m2
Bottom Width = √(1500/3) - 4.5 = 17.8608
Round off the Bottom width
Bottom Width = 18 m
Bottom Area = Bottom Width X Bottom Length = 18* 18 = 324 m2
Volume of Farm Pond = (Top Area + Bottom Area) / 2 * Depth
= (729 + 324)/2 ) * 3 = 1579.5 m3
The Farm Pond Size will be = 27 X 27 X 3
- Depending on the standard rates of farm pond construction, cost of construction (rupees) is estimated.
- Total Surface runoff (mm/year) is displayed in the final output table along with the farm pond size and the cost of construction. Display the Farm owner details based on the data fetched for survey number from Bhoomi data.
Table 7.2 Calculating cost of Farm Ponds based on Cubic meter rate, (Amount in Rupees/cum)
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South Zone |
North Zone |
North Zone (Shimoga & Chithradurga dists.) |
North East Zone |
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Clayey/black soil |
Loamy/red soil |
Clayey/black soil |
Loamy/red soil |
Clayey/black soil |
Loamy/red soil |
Clayey/black soil |
Loamy/red soil |
|
172 |
164 |
186 |
179 |
173 |
164 |
183 |
206 |
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Districts. |
Districts. |
Districts. |
Districts. |
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Kodagu |
Dharwad |
Shimoga |
Bellary |
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Udupi |
Gadag |
Chithradurga |
Raichur |
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South Canara |
Haveri |
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Koppal |
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Hassan |
Belagavi |
Kalburgi |
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Chickmagalore |
Uttarakannada |
Yadgir |
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Mysore |
Bijapur |
Bidar |
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Mandya |
Bagalakote |
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Chamarajanagara |
Davanagere |
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|
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Ramanagaram |
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Tumkur |
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Chickballapur |
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Bangalore(u) |
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Bangalore® |
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Kolar |
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1) Without smoothening of segments 2) costing as per WDD schedule of rate- 2018-19 |
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