.180 



PORT JACKSON SILT REDS. 



APPENDIX I.— continued. 



No. of 

 Boring. 



Distance 



from Fort 



Macquarie 



Point in feet. 



Depth 



of Water 



in feet. 



Depth of 

 Silt in 

 feet. 



Total Depth of 

 Channel in feet. 



7 



700 



36 



61 



97 



8 



800 



35 



49 



84 



9 



1000 



43 



48 



91 



10 



1300 



43 



64 



107 



11 



1400 



46 



60 



106 



12 



1500 



51 



32 



83 



13 



1550 



46 



12 



58 



14 



1600 



37 



3 



40 



15 



]700 











to North Shore. 



Remarks. Square Feet. 



The sectional area of the whole channel 



from low tide level to bed rock =113,900 



The sectional area of the silt beds = 52,190 



Consequently the silt beds fill *45 of the channel. 



APPENDIX II. 



Abstract of boring records from Dawes Point to 

 Milson's Point across Port Jackson, reduced to low 

 water mark. 



No. of 

 Boring. 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



Distance 



Depth 



Depth of 



from Dawes 



of Water 



Silt in 



Point in feet. 



in feet. 



feet. 



50 



22 



2 



]00 



32 



2 



150 



43 



4 



200 



50 



5 



250 



58 



2 



300 



69 



2 



350 



74 



19 



450 



70 



24 



500 



62 



30 



550 



60 



32 



650 



53 



33 



750 



51 



27 



850 



49 



27 



950 



42 



46 



1100 



42 



28 



1150 



42 



30 



1250 



50 



32 



1300 



52 



| 28 



1400 



57 



| 23 



1500 







o 



Total Depth of 

 Channel in feet. 



24 

 34 



47 

 55 

 60 

 71 

 93 

 94 

 92 

 92 

 86 

 78 

 76 

 88 

 70 

 72 

 82 

 80 

 80 

 to Milson's Point 



Remarks. Square Feet. 



The sectional area of the whole channel from 



low tide level to bed rock = 98,280 



The sectional area of the silt beds =28,290 



The silt beds therefore fill *29 of the whole channel. 



