In the past few days, I was asked a similar question twice. Why would water located at a school attract more girls or benefit girls more than boys?
In most sub-African countries, getting water is not equal opportunity job. Congolese girls are the overwhelming majority of water fetcher at any water source. It does not matter if it is a urban or rural watering hole (water source).
Here's video of a water source in the rural village of Bulape or see below. You will note that most of those gathered to get water are girls. As my guide, Justin noted -- a headmaster at the girls school, many of the girls did not attend school on that day to the water source. It is pretty hard to explain any absence when you are coming from the water source with a 40 pound jar of water on your head.