Civil Engineer here, the way the article reads it looks like rather than standing bodies of water, the village is creating what we would call a “retention pond” a depression in the earth that collects and stores rainwater runoff rather than it flowing elsewhere off site. I do not know the calculations that went into this but we would normally assess the soil make-up and the infiltration rate those soils have. We could then calculate how quickly the water in the pond will drain down after a storm event. So long as it’s quicker than 72 hours, this typically is assumed mosquitos will not have enough time to develop in that body of water. These retention ponds are common practice on sites and developments in the US as they allow the storm runoff to be treated and infiltrate into the ground.

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