See the link below.

... If I can use an analogy for the Committee, the increase in funding that EPSRC has received has allowed us to turn up the tap on the bath so that the level of grant, the level of water in the bath, has risen up, and that we have done, but as you turn up the level of water in the bath, the outflow increases and, in fact, it is an outflow that EPSRC has control of, so we have what we call the departmental expenditure limit which is the annual resource budget for EPSRC. Clearly we wish to manage our budget so that there is the maximum amount of grants out there and that they use the maximum amount of funds that we have. But when you turn up the tap and the level increases then there comes a time when you have to turn down the tap because the outflow at the bottom was the grants you funded some years ago, so the pattern of increases that we have had from OST has led us to increase the level of new grants immediately when the new funds became available and then tail it down a little bit so that we are retaining our budget within the agreed budget profile from the OST...

https://publications.parliament.uk/pa/cm200203/cmselect/cmsc...

"Throttle the Bottle, Turn up the Tap"

"Everyone understands that water is essential to life.
But many are only just now beginning to grasp
how essential it is to everything in life -- food,
energy, transportation, nature, leisure, identity,
culture, social norms, and virtually all the products
used on a daily basis."
- World Business Council for Sustainable Development (WBCSD)

http://www.mwra.com/annual/contest/2008/writing/68_2thibault...

Home is where the Wind Blows: Chapters from a Cosmologist's Life
https://books.google.co.uk/books?isbn=093570227X
Fred Hoyle - 1994 - ‎Science
Turn up the tap, and the Universe speeds up; turn down the tap, and the Universe slows. Now I felt I understood why the Universe was observed to be expanding: it was because matter was being created everywhere. Let me insert a bit of a diatribe against the big bang at this point. Why, in the big-bang view, does the ...

Iraq to turn up oil tap this year - World Oil
www.worldoil.com/news/2013/9/24/iraq-to-turn-up-oil-tap-thi...
24 Sep 2013 - DUBAI -- Four years after war-scarred Iraq enlisted major oil companies to develop its oil fields, the country is about to turn up the tap.

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Note added at 9 hrs (2018-03-20 20:27:59 GMT)
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and of course, if you want the water flow to decrease, I'd say "turn the tap down" ;-)