Why is equation 1 divided by 12" ? Vr=(P.Rv.A)/12"

Hi everyone, I got a question about the calculataion of Volume of captured run off; In the formula,(V= P.A.R/12) P value is taken according to the location of project ; humid ,semi arid and arid.w

I am finding it difficult to locate standard CN values for BMPs. There are not many studies out there and the ones I have found have calculated large ranges for permeable pavers, green roofs etc.

The 2 year, 24-hour design storm precipitation data is unavailable for the country. However, Historic rainfall data exists.

Hi --can a swimming pool be considered a retention pond? And are swimming pools considered to be 100% pervious? Or is it a matter of whether the water is treated before re-use or release?

Good morning, We are working in a Project in Asunción, Paraguay.

Hello, In our project outside the US and in the rainy tropics our site pre-development is >50% impervious (only 10% site is natural green) therefore we need to go for 25% reduction in both volu

To reduce runoff peak and quantity our project team used an embedded underground chambers system.

How to calculate 2 year 24 hour design storm?

Hi, I have a NC project in Colombia and the Environmental Authority just have IDF curves since 3 years. I don't have information since 1 and 2 years.