western ▁part ▁at ▁the ▁valley ▁around ▁Pok ▁Fu ▁Lam . ▁The ▁res er voir ▁was ▁a ▁solution ▁to ▁the ▁emer gent ▁problem ▁of ▁clean ▁water ▁supply ▁in ▁Hong ▁Kong . ▁Pok ▁Fu ▁Lam ▁Road ▁soon ▁developed ▁as ▁the ▁connection ▁of ▁the ▁Western ▁district ▁to ▁the ▁smaller ▁har bor ▁of ▁Hong ▁Kong ▁in ▁Aber de en , ▁where ▁Douglas ▁planned ▁to ▁set ▁up ▁his ▁do cks . ▁ ▁In ▁ 1 8 6 1 , ▁he ▁bought ▁the ▁ 9 0 0 ▁square ▁meter ▁hill , ▁which ▁includes ▁the ▁location ▁of ▁today ' s ▁University ▁Hall , ▁the ▁High ▁West ▁and ▁tennis ▁courts . ▁During ▁ 1 8 6 1 – 1 8 6 7 , ▁Douglas ▁built ▁the ▁Douglas ▁Castle , ▁to ▁over look ▁his ▁fleet ▁entering ▁and ▁leaving ▁the ▁har bor . ▁The ▁gross ▁building ▁area ▁of ▁the ▁castle ▁was ▁around ▁ 2 0 0 0 ▁square ▁feet , ▁which ▁was ▁a ▁two - story ▁structure , ▁located ▁at ▁today ' s ▁W arden ▁Fl at . ▁In ▁ 1 8 6 6 , ▁Douglas ▁returned ▁to ▁Great ▁Britain ▁and ▁the ▁castle ▁was ▁inherited ▁by ▁his ▁nep hew , ▁John ▁Ste ward ▁Lap ra ik . ▁ ▁Douglas ▁Castle ▁under ▁the ▁French ▁Mission ▁( 1 8 9 4 - 1 9 5 4 ) ▁In ▁ 1 8 9 4 , ▁Hong ▁Kong ▁Hong ▁Kong ▁was ▁declared ▁to ▁be ▁an ▁inf ected ▁port ▁of ▁the ▁b ub onic ▁pl ague . ▁The ▁killing ▁sp ree ▁of ▁the ▁pl ague ▁claimed ▁thousands ▁of