The phrase "heavy drain" is grammatically correct and commonly used in written English.
It refers to a large amount or significant impact of something being drained, such as resources, energy, or money. Example: "The construction of the new building has caused a heavy drain on the city's budget."
Years of warfare with the Ottomans imposed a heavy drain on the Ṣafavids' resources.
The maintenance of millions of ill-trained and under-equipped troops was a heavy drain on the economy.
Establishing such a protectorate and keeping it viable would be a heavy drain on the Western powers.
Since 2008 the country's public debt has more than tripled, to 36% of GDP.Gas subsidies remain a heavy drain on the public purse.
This was a heavy drain on resources in the middle of a pitched battle with Al Qaeda, but our intervention was necessary to avoid further escalation.
Those troubled individuals are only about a quarter of the homeless population, but are a disproportionately heavy drain on public resources as they cycle through emergency rooms and jail cells.
On continuous or heavy drains they perform very well and have distinct advantages over the relatively cheaper carbon-zinc batteries, on a performance per unit cost basis.
Sunday's bloody massacre of American and French peacekeeping troops in Beirut evokes a heavy and draining sorrow, outrages a determination to take some action.
Heavy use drains the battery even faster.
That brings its own pressure, since the cost of missing out will be a heavy and draining sense of failure.
A spokeswoman for the Environment Agency said: 'We're satisfied that the main river, which is the Environment Agency's responsibility, has sufficient capacity to cope with water from heavy rainfall draining into it.
