Cyclone and Storm Surge - Iczmpwb.org

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3.12 3.9. Drainage scheme of Dr. B.N. Dey As a result of loss of the Bidyadhari, the only available outfall channel, drainage prospect of Kolkata became a matter of grave concern. A fresh suitable outfall channel had to be identified in the vicinity in place of the decrepit Bidyadhari river. The city had grown in the meantime and so the internal system of collection and conveyance of the drainage became woefully inadequate. Against this disconcerting backdrop, Dr. Birendra Nath Dey (1891-1963), who later became the Chief Engineer, Calcutta Corporation (1929-43) drew up a scheme incorporating augmented facilities for internal drainage, as well as a new outfall channel around 30 Km. farther east in Kultigang, a tidal creek, which ultimately flows into the Bay of Bengal via the Raimangal estuary. Kultigang which now constitutes the main outfall of Kolkata's drainage opened up much later than the Bidyadhari. In fact the former feeders of the Bidyadhari like the Nowi, Sunti and Nonagang, from North 24-Parganas, changed their allegiance to the Kultigang. The Circular-Beliaghata-Newcut- Kestopur and Bhangar Kata system emanating and catering to rapidly growing urban conglomerations join the Kultigang. The SWF and DWF channels of Kolkata Corporation including the discharge of the Tollygunj-Panchannagram outfalls into the Kultigang at Ghusighata. As urbanization continues in eastern Kolkata further volume of flow will outfall into Kultigang. The salient features of the Kulti outfall scheme are as under: From Topsia lock water is directed by gravity up to Ghushighata through a 34 km long lined channel, where it discharges into Kultigang through a sluice. This is the dry weather flow (DWF) channel. From the Palmer Bridge (also often referred to as Palmer bazaar) pumping station there is a 7.47 km long Town Head Cut (THC) drainage channel leading to the Storm Weather Flow, or SWF, channel. This channel meets the DWF channel at Bantala where there is a primary sedimentation tank to partially purify the effluents. From the Ballygunje pumping station there is a 7.163 km long storm water floe drainage channel, known as the Suburban Head Cut (SHC) which meets the THC at Bantala and flows as a combined Storm Water Flow Channel, or SWFC. The 1.829 km long storm water channel emanating from the Dhapa Lock pumping station meets the THC at Makalpota. The bottom width of the SWF channel is 36.58m and has a carrying capacity of 76.47 cumec. The DWF channel is concrete lined and has a carrying capacity of 18.97 cumec. The SHC is 34km long and at Ghushighata, it outfalls into the river Kultigang through two regulators having 20 and 16 sluice gates, respectively.
3.13 It may again be of interest to note the formation of the new drainage channels at the time of the establishment of the proposals of Dr. B. N. Dey. Attention is drawn to a map of Murray’s handbook (1924) provided by Jill Grey and taken from the website of Ian Poyntz under the maps of Bengal Presidency at http://homepages.rootsweb.com/~poyntz/India/maps.html, presented in Figure 3-3. It may be observed from the map that the Krishnapur Canal (often referred to now as the Keshtopur Khal) and the New Cut Canal had been in existence then. The proposed Grand Trunk canal is now what is the Bagjola Canal. The salt lakes to the east of Kolkata (now partly Bidhan Nagar) is seen to be connected to the tidal creeks, as inferred from the note stating the salt water lakes to be tidal. Figure 3-3. Map of Kolkata and surroundings by 1924 By courtesy of Ian Poyntz (website http://homepages.rootsweb.com/~poyntz/India/maps.html)
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HAZARD ASSESSMENT AND DISASTER MITI
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Project Team Though the outcome of
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Preamble The State of West Bengal,
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1.2 IMD, in its website (http://www
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1.4 5. Proposals for location of cy
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2.2 region is that which struck the
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2.4 Figure 2-2. Track of the 1970 B
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2.6 The most destructive element as
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2.8 the two regions is rather diffe
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2.10 2.4. The eastern coastal zone
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2.12 velocity is first checked. As
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Page 42 and 43: 2.32 A retired embankment of river
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Page 54 and 55: 2.44 • Transport the water to the
Page 56 and 57: 2.46 The other type of failure may
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Page 68 and 69: 3.6 Figure 3-1. Map of India during
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Page 76 and 77: 3.14 3.10. CMPO and KMDA (originall
Page 78 and 79: 3.16 Flows are diverted to the loca
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Page 82 and 83: 3.20 the ocean level as a result of
Page 84 and 85: 3.22 Table 3-6. Major pumping stati
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Page 92 and 93: 3.30 Respectively. The discharge of
Page 94 and 95: 3.32 Figure 3-6. The downstream of
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Page 108 and 109: 4.8 Table 3: Return periods of cycl
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Page 112 and 113: 4.12 work station (the Automated Tr
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Page 116 and 117: 4.16 Mean Low water 1.51 1.39 1.34
Page 118 and 119: 4.18 τx,τy : x and y components o
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Page 122 and 123: 4.22 ∂u ~ ∂ ~ ~ ∂ ~ ~ ∂ζ 1
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4.24 Δ p p(r) = p( ∞) − [1+ (r
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4.26 maximum surge for this event w
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4.28 U-Component of Velocity (Surfa
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4.30 ## ## ## #### ### ## ########
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4.32 V-component of Velocity (Surfa
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4.34 U-component of Velocity (Surfa
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## ################################
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4.38 V-Component of velocity (Surfa
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5.2 particular human settlement to
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5.4 The Composite Vulnerability Ind
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5.6 (2004 prices) prevalent in dist
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5.8 Moyna 0.6280 0.1592 0.542286 0.
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5.10 5.4.2. Social infrastructure H
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5.12 Budge-Budge(Part-II) 0.0000 0.
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5.14 secondary and tertiary activit
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5.16 F i Fˆ i ⎛ Total no. of =
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5.18 Table 5-4: Composite Index of
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5.20 M ′ = H M ′′ = I . S whe
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Chapter Six Mitigation Strategies a
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6.3 Beside these differences in lev
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6.5 • to reduce the destructive f
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6.7 6.2.4. Methods of Construction
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6.9 is attached to the structure. T
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6.11 (b) Medium rivers to armour th
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6.13 Likewise, in all the embankmen
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6.15 Figure 6 -5 Figure 6 -6 Figure
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6.17 Benefit cost ratio Area benefi
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6.19 Location and cost of proposed
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6.21 Swaraupnagar Swaraupnagar 100
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6.23 Gobadia Kakdwip Dk Kasiabad &
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6.25 Location and cost of proposed
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6.27 " Jagaddal " 800 6400000 " Jag
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6.29
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6.31
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6.33
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6.35 Figure 6 -11 Figure 6 -12
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6.37 Figure 6 -15 Figure 6 -16
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6.39 Figure 6 -19 6.2.7. Recommenda
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6.41 4. Rajraj Swarup & Ramnagar Ab
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6.43 project. Such sediment deficit
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6.45 paludosa, Rhizophora apiculata
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6.47 15. Ceriops tagal 0.22 0.40 0.
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6.49 shelterbelt (average 100 m wid
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6.51 (assuming land acquisition cos
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6.53 location are missing reducing
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7.2 resulted in large scale waterlo
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7.4 5. No adverse effect in drainin
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7.6 15 LT Panel L.S. 2,200,000 16 I
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7.8 Bagjola, Kestopur and SWF chann
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Executive Cost Summary of Recommend
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References Kanjilal (2005) “Sunde
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“……………….Designingadis
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