IMPROVEMENT OF THE KARACHI HARBOUR. 139 



1 90 1 the totals are as follows, the quantities being expressed in 

 millions of cubic feet : — 



Section. 



Scour. 



Silt. 



Dredging, 



1 



14-105 



26-052 



40-279 



2 



'9 - 5 2 3 



10-756 



25-829 



3 



16-071 



6-461 



30-418 



4 



7 201 



15-165 



8-366 



5 



1-406 



59'234 



105-482 



6 



17-252 



5'549 



32065 



7 



13-214 



750 





Total 



88-772 



123-967 



242*439 



From this it appears that there has been a net enlargement of the 

 capacity of the harbour of 207,244,000 cubic feet, and this re- 

 presents the amount of material which has been removed from the 

 harbour, and deposited somewhere outside. 



If we now turn to the growth of land at Clifton, we find an in- 

 creased area of about 7,000,000 square feet over which the deposit 

 cannot be estimated at less than 15 feet on the average. There is 

 also an area of about 1,750,000 square feet covered with sandhills, 

 whose average depth may be taken as not less than 10 feet. These 

 two together account for 122,500,000 cubic feet of material, and 

 this estimate is a minimum one. To it must be added the deposit 

 over some 4,000,000 square feet lying between the two areas, so that 

 the accumulations at and near Clifton may be taken as amounting to, 

 roughly, two-thirds of the total amount of material removed from the 

 harbour, and to rather more than half of the amount of the dredgings 

 which have been dumped in the sea off the Clifton shore. 



At first sight this would seem to support the view of those who 

 consider the growth of the sandhills to he entirely due to the dredg- 

 ing of the harbour, and this might be still further supported by the 



( 7 ) 



