8/4/2019 Ground Water Recharge Bangalore Experience

http://slidepdf.com/reader/full/ground-water-recharge-bangalore-experience 1/6

Ground water recharge gallery-open well and existing borehole.

Figure: Infiltration gallery.

Source: Bangalore city –KSCST ground water recharge project site(s)

Rain water from the roof can be allowed to recharge groundwater from an existing open

well or bore well. In case of an open well, filtered rainwater can be directly let in to the well

through pipe from any one side of the well. Wells can be built by digging the ground to the

required depth of 4.5m – 9m and by building the retaining wall around(preferably round) or 

by inserting cement rings to avoid caving in of the sidewall

Infiltration gallery for borehole recharge

Clip 1- Dug ell & Concrete ring Clip 2- Infiltration gallery

Clip 3; Infiltration bore holes Clip 4: Finished infiltration gallery

8/4/2019 Ground Water Recharge Bangalore Experience

http://slidepdf.com/reader/full/ground-water-recharge-bangalore-experience 2/6

Infiltration gallery is to store rainwater temporally and allow the stored water to infiltrate into

underground aquifers. When the rainwater from the roof is allowed to flow on the ground ,

infiltration(water percolating into the ground) is less, causing more of runoff, thereby,

majority of rainwater quickly, reaches the drain or street and flow away from the building

To artificially increase infiltration, two parameters are important; increasing the surface

areas of the soil/earth in contact and creating water head on the soil/earth. This lead to

larger infiltration of rainwater into the ground

A perforated pipe need to be fitted in a layer of filter media(gravel and) One end of the

perforated pipe I inserted into borehole by drilling a hole(hole size equivalent to outside

diameter of the perforated pipe) in the casing pipe of the bore hole . The other end of the

pipe is blocked with an end cap. The end inserted in the bore hole should not protrude so

much to hinder pump installation. The holes are to be on the lower side of the pipe to

minimize silt and clay entering bore hole.

Figure; Model of infiltration gallery for a perforated well.

Infiltration gallery

8/4/2019 Ground Water Recharge Bangalore Experience

http://slidepdf.com/reader/full/ground-water-recharge-bangalore-experience 3/6

Figure: bore Hole recharge model, Source: Kidwai

hospital -Bangalore

Figure : Excavation for infiltration gallery-borehole

recharge

Source: Kidwai hospital -Bangalore

Figure Direct recharge from storm drains

Earthen bunds

8/4/2019 Ground Water Recharge Bangalore Experience

http://slidepdf.com/reader/full/ground-water-recharge-bangalore-experience 4/6

Figure Earth bunds for recharging ground water 

Figure.Continous contour trenching on a sloping field

8/4/2019 Ground Water Recharge Bangalore Experience

http://slidepdf.com/reader/full/ground-water-recharge-bangalore-experience 5/6

8/4/2019 Ground Water Recharge Bangalore Experience

http://slidepdf.com/reader/full/ground-water-recharge-bangalore-experience 6/6

Figure: Rainwater harvesting - staff houses Indian Institute of Technology Bangalore