1,000 WORDS

BANKS OF FOAM: The Yamuna river at the Okhla Barrage on the Delhi-Noida border after a shower of heavy rain. Rain is supposed to clean the Yamuna's otherwise filthy waters. But as can be seen here, they have caused industrial foam to be pushed downstream. Delhi causes maximum pollution in the Yamuna. The 22-km stretch of the Yamuna in Delhi from the Wazirabad to the Okhla Barrage receives a discharge of 850 MGD (million gallons per day) of sewage from 21 drains. The 33 Sewage Treatment Plants operational at present treat only 390 MGD of this, although even their total combined capacity of 640 MGD is inadequate to treat all of the sewage emptied into the river.