FLOODS (Disaster management)
In disasters of massive scale the government machinery of even the developed world may be useful only in salvaging and replenishing after the deluge is over, not due to lack of infrastructure, but due to the innumerous forms and intensity of disasters and the lack of will in collecting and collating vast data and creating and rehearsing systemised response procedures and mechanisms.
In disasters of massive scale the government machinery of even the developed world may be useful only in salvaging and replenishing after the deluge is over, not due to lack of infrastructure, but due to the innumerous forms and intensity of disasters and the lack of will in collecting and collating vast data and creating and rehearsing systemised response procedures and mechanisms.
External storage type city- the solution
An oversized canal is strung around the city with the leeward side of the canal facing the open- country. Any overflow or release from the water reservoirs can flow through these canals to the sea/ lower areas outside the city. To cater to the canals getting overwhelmed side channels or sub canals on leeward side can be constructed at regular intervals. The encircled main canal should leave adequate space for the citys’ expansion. However the rivers flowing inside the city should be preserved so as to cater for rains and cloudbursts inside the city. Of course the usual drill of keeping city drainages clean is a must. In fact for Chennai like cities this is the one and only solution combined with computer aided weather analysis machines.
Explanation for the diagram
storage reservoirs and rivers - marked in blue.
proposed boundary canal - in purple ( leeward or outer side has outlets for sub canals.
boundary of Chennai city - marked as black outline
An oversized canal is strung around the city with the leeward side of the canal facing the open- country. Any overflow or release from the water reservoirs can flow through these canals to the sea/ lower areas outside the city. To cater to the canals getting overwhelmed side channels or sub canals on leeward side can be constructed at regular intervals. The encircled main canal should leave adequate space for the citys’ expansion. However the rivers flowing inside the city should be preserved so as to cater for rains and cloudbursts inside the city. Of course the usual drill of keeping city drainages clean is a must. In fact for Chennai like cities this is the one and only solution combined with computer aided weather analysis machines.
Explanation for the diagram
storage reservoirs and rivers - marked in blue.
proposed boundary canal - in purple ( leeward or outer side has outlets for sub canals.
boundary of Chennai city - marked as black outline
INDIAN OCEAN
Internal storage type city
In such cities the storage area and flow areas should be kept vacantof houses. Alternatively canals to take the water away in entirely different directions can be made on the lateral sides of storage areas. If this is also not possible due to lack of place then piped drainage from each drainage sector can be deviced in such a way that these pipes continue with their own sector water until thay reach the outskirts of the city. This will prevent spillage or overflow of water of one sector's water into another sector when it joins in a single open drain. Here the emphsis is on disallowing fast flowing water to accumulate at bottlenecks (as traffic at signals) and using the closed curvature of a pipe to increase water carrying capacity, when excess water comes in. Also these huge cement pipes can run on or along the existing drains thus saving space. One disadvantage is that these pipes if not monitored, will be used by antisocial elements as a safe haven in non rainy seasons.
Diagrammatic representation
Large Dam based storage systems-
In such cities the storage area and flow areas should be kept vacantof houses. Alternatively canals to take the water away in entirely different directions can be made on the lateral sides of storage areas. If this is also not possible due to lack of place then piped drainage from each drainage sector can be deviced in such a way that these pipes continue with their own sector water until thay reach the outskirts of the city. This will prevent spillage or overflow of water of one sector's water into another sector when it joins in a single open drain. Here the emphsis is on disallowing fast flowing water to accumulate at bottlenecks (as traffic at signals) and using the closed curvature of a pipe to increase water carrying capacity, when excess water comes in. Also these huge cement pipes can run on or along the existing drains thus saving space. One disadvantage is that these pipes if not monitored, will be used by antisocial elements as a safe haven in non rainy seasons.
Diagrammatic representation
Large Dam based storage systems-
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