Vocabulary consisting only from characters you are able to read
下る
くだる
(1)to descend, to go down, to come down, (2)to be handed down (of an order, judgment, etc.), (3)to pass (of time), (4)to surrender, to capitulate, (5)(often in neg. form) to be less than, to be i godan, jlpt3, verb, vintrans
水力
すいりょく
hydraulic power, water powermix
入口
いりぐち
entrance, gate, approach, mouthjlpt5