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Figure 5 : Constructed wtland for removal waste water treatment (Horozontal flow with macrophytes) � � � 364
National Seminar on Rainwater Harvesting and Water Management 11-12 Nov. 2006, Nagpur 63. Suggested Design Approach for Planning and Designing Recharge Wells and Systems � Introduction It is needless to mention that it is already a high time that high priority and importance is assigned to systematically start planning and executing recharge projects in all the areas to prevent the ground water depletion and create a systematic and scientific battery for ground water storage for use throughout the year. If systematically planned and executed on coastal belt the recharge wells can prove to be a very useful barrier to sea water intrusion. Lot of efforts are being made and lot of talks are being done all around in various bodies connected with ground water about recharge structures. In many places even regulations are being made for making it compulsory to make recharge wells in societies etc. In some of the states like Karnataka, Kerala much importance is already being given to rain water harvesting which requires a recharge well ultimately to percolate the rain water into the ground to recharge the aquifers. Hence the recharge well is the core mechanism of recharging the ground water for all kinds of water collection methods – check dams, rain/roof water harvesting, water logging areas etc. It is also seen that different types of designs of recharge well is being adopted by different bodies and there does not seem to be a commonly accepted design proven to be the optimum for achieving the maximum efficiency of recharge. Hence a need was felt to develop a standard design approach giving clear guidelines for designing the recharge well. This article attempts to initiate the process of defining the design criterion and a general design approach and further work needs to be done to make it more and more specific. *Dharmesh Mashru What is a recharge well Even at the cost of some repetition of what we already know let us define clearly what a recharge well is supposed to do and how it works in very simple terms. A recharge well is a natural injection well to inject the water supplied to it by recharge mechanism into the desired aquifer to be recharged. The water collected in recharge catchments mechanism enters the pipe assembly of well and acts against the already present hydrostatic pressure of water already available in the aquifer, overcomes the friction of the well casing, screen slots, gravel pack and formation and tries to penetrate thru the formation to start storing more water in the available voids in an unsaturated aquifer till the time the aquifer is saturated. Very simple as it sounds but equally challenging if one wants to give full justice to the design. Important considerations for designing a recharge mechanism Following are the important aspects for planning a recharge mechanism project � The location of recharge mechanism This is a very important aspect and much study is required to be done before selecting a recharge site. It is seen that presently the only consideration given while selecting the site is the natural collection of water – either a lake or a pond or a water logging spot or building check dams across flowing river etc. But, to create an efficient and sustainable site for recharge following approach is recommended – � Common recharge site shall be planned for a *Chief Operating Officer, Johnson Screens (India) Ltd.- Ahmedabad 365
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Page 3 and 4: once subsoil water starts draining
Page 5 and 6: The plantation process starts with
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Page 11 and 12: Table 1. Present land use of waters
Page 13 and 14: the determination of specification
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Page 23 and 24: Table 3 : Seasonal water use (mm) i
Page 27 and 28: pinnata) Aquatic plants are represe
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Page 31 and 32: SUDS (Sustainable Drainage Systems)
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Page 73 and 74: CASE STUDY The Salem Municipality i
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In coastal areas of Gujarat, the vi
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Water diversion Channel The work fo
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04. Natural Water harvesting at Sol
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Work Done Storage No. of Area No. o
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Conclusions The process of rainwate
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Infact, these are ‘lessons’ tha
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we get our act together and make wa
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National Seminar on Rainwater Harve
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and weathering also control the wat
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One relatively easy means of storin
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Ground Water Conservation Technique
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anging from 37-60% of recommended d
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given priority before implementatio
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was having potential to irrigate 15
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water, use of improved seed and bal
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the result of the success they have
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un off from one hill and conveying
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harvest will certainly solve the wa
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If the rain precipitation in a vill
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echarging , A study of world wide f
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these villages, the people themselv
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improve the quantity and the qualit
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The opinion of the public for the q
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in fact the base of energy in Tajik
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end of 80’s building of Roghun’
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consumption of oil on 11 times more
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change waterness charge o Vakhsh m
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are following: a) Compound of const
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for subsequent use of water for irr
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years. These beels can also be conv
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ody through water conservation and
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contribute to increased fish produc
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Figure 1 : Map of Bangladesh showin
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end uses and the intentional manage
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INTRODUCTION Indian water sector is
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ut definitely they are not substitu
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having the height greater than 50m
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ain. There is no conducive evidence
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chase food self sufficiency as a go
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REPORTB OF WORLD COMMISION ON DAMS
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Accepted Papers - 3.pdf - UNESCO

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