Dr. Vadagbalkar S.K.- Geologist and consultant has designed and successfully recharged the low yielding bore well in hard rock - basaltic terrain of Deccan traps. Low yielding bore well in the basaltic rock is recharged by roof water collection in DAV institute, Solapur city, Maharashtra State, INDIA - to enhance its yield.

1. Name of the Project : - Roof Rainwater Harvesting in Dayanand Institution Campus (For Low Yielding Bore well) Design and Consultant : - Dr. Vadagbalkar S. K. Geologist and Hydro geologist Head, Department of Geology Dayanand Institions, Solapur, Maharashtra State, INDIA Category : - (a) Institutional Location : - Dayanand Institutions Campus, Raviwar Peth, Solapur-413002 Maharashtra State

3. Schematic Diagram of Roof Water Harvesting in Dayanand Institutions Campus, Solapur Building Roof Area 20MX13.5M=270 Sq. M. PVC Collection Pipe with accessories of 75 mm Diameter 600 mm Sectors(3) Screened Filters(4) Reducer (2) from 150 mm to 75 mm Capped T Opening (2) for backwash & excess flow regulation Inlet from roof Outlet in the bore Regulating Valve Filter Material Soak pit 2X2X2 Meters Screened casing covered with nylon mesh Rubble or Shingle > 20 mm Coarse Sand > 12 mm Medium Sand > 6 mm

4. Geological Formations Determined with Electrical Resistivity Technique before the digging of the bore well. This is confirmed by logging. Recharging for water storage is at the depth of 10-15 and 40-50 meters in the adjacent rock fractures Depth from surface Type of Formation (Rocks) 0-1 meters Soil/ Murum 1-10 meters Hard Jointed Rock 10-15 meters Red bed mixed with hard Zeolite Rock (seasonal water zone) 15-40 meters Hard Massive Rock 40-50 meters Red Bed mixed with Hard Jointed Rock (low yield water zone) 50-90 meters Hard Massive Rock

5. Low Yielding Bore well of 90 meters Depth with water struck at 45 meters and screened double casing and submersible pump A trench of 2X2X2 meters is used as soak pit (filter bed) after refilling by rubble, stones, coarse sand, gravels etc. for collection and percolation of surface run off water from surrounding area of 2000 sq. meters

6. Low Yielding (seasonal) Bore well of 90 meters Depth with water struck at 45 meters. With screened double casing(210 mm and 180 mm. Submersible pump with 1.25 HP and 25 mm outlet. A trench of 2X2X2 meters is used as soak pit (filter bed) after refilling by rubble, stones, coarse sand, gravels etc. for collection and percolation of surface run off water from surrounding area of 2000 sq. meters

7. Filter Bed with 150 mm diameter PVC pipe of 1.8 meter length. Three sectors of 600 mm each are separated by screened filters partitions. Three different size materials >20 mm, >12 mm & > 6 mm are filled in the sectors. Inlet is towards roof water collection through fine sized material compartment Towards outlet coarse material. The capped T openings are two in number at two ends, joined with reducer from 150 mm to 75 mm – a provision for backwash and excess flow regulation One extra regulating valve is also supplied for control of flow.

8. Roof water collection through PVC pipes for collection of water from 270 sq. meter roof area and water run off from surrounding into the soak pit. Roof water passed through a PVC filter bed prepared indigenously by using natural filter materials in the bore well directly.

9. View of surrounding area of surface run off and roof water harvesting building along with bore well site in front

10. Partial view of roof water harvesting building along with vertical and horizontal PVC pipes collecting the water and control panel board for submersible in the bore well

11. Partial view of roof water harvesting building along with vertical and horizontal PVC pipes collecting the water and control panel board for submersible in the bore well

12. Partial view of roof water harvesting building along with vertical and horizontal PVC pipes collecting the water and the filter