350000
To complement the floodway , the Napindan Hydraulic Control System ( NHCS ) was built in 1983 at the confluence of the Marikina River and the Napindan Channel of the Pasig River to regulate the tidal flow of saline water between Manila Bay and the lake , and to prevent the intrusion of polluted water into the lake .
 Manila
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Manila