Detailed Project Report - Commissionerate of Rural Development ...

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District Watershed Development Unit - Jamnagar 4 Malavada Percolation Tank Farm Pond L P Staggered trenching/Stone bunding(SCT) R C (DCF,Teri ttorrial) (DCF,Teri ttorrial) (DCF,Teri ttorrial) 0.0 10 80000 60 Ha 750000 Earthern Bunds D C (DCF,Teri ttorrial) 2000 rmt 475000 Waste Weir(5 mt (DCF,Teri D P ttorrial) Length) 57 769500 Field bunds L P (DCF,Teri 8500 rmt 588000 ttorrial) Gully Plug D C 20 Nos. 180000 Check Dam D C (DCF,Teri ttorrial) 7 1727000 Cause Way D C (DCF,Teri ttorrial) 4 1353000 Percolation Tank (DCF,Teri ttorrial) 0.0 Farm Pond L P (DCF,Teri ttorrial) 3 24000 Total 5,75,38,388/- Detailed Project Report – IWMP-1 (Patan )
District Watershed Development Unit - Jamnagar Table No. 40.1, Technical Specification of stone bund Particulars Value Units Top width of bund 0.5 Mt. Bottom width of Bund 1.3 Mt. Depth above ground level 0.55 Mt. Depth of Foundation 0.2 Mt. Cross section of bund 0.68 Sq. M Proposed Area 250.00 Ha. 2. Staggered contour Trenches Over time, experience of watershed programs has shown that it is better to stagger the digging of contour trenches. This is because it has been found that invariably errors have been made in contouring over long distances. If the contour trench is not level and by mistake sloped, then water starts to flow from the high point to low point, cutting a path and increasing soil erosion. Therefore instead of making trenches continuous they should be made in staggered, discontinuous manner. Trenches are any form of depression or micro pit constructed over the land surface in order to prevent soil erosion and to absorb rainwater in non arable lands. Trenches are constructed along the contours [called contour trenches) on hill slopes above 15% with vegetative supports for forestry and horticulture land uses. Contour trenches are used both on hill slopes as well as on degraded and barren waste lands for soil and moisture conservation and afforestation purposes. The trenches break the slope and reduce the velocity of surface runoff. It can be used in all slopes irrespective of rainfall conditions (i.e. in both high and low rainfall conditions), varying soil properties. For vegetative supports forage grasses as well as economic trees can be planted. The trenches were working as silt trap earlier. Periodical maintenance by way of unearthing of the trenches and depositing on the downhill side ought to be given due attention by the beneficiaries themselves. Table No. 40.2, Technical Details of Staggered Contour Trenches Particulars Value Units Trench Length 5.00 Mt. Detailed Project Report – IWMP-1 (Patan )
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