Roof Rainfall Trajectory

The roof catchment area is the total of all horizontal roof areas draining to all sides of the box gutter including half the area of any vertical faces that may run off into the box gutter.

Roof rainfall trajectory.

Without the presence of wind raindrops would fall vertically and a roof with eaves would be all that was needed to protect windows and other sensitive building elements in the wall from getting wet. Since roof slopes will vary from home to home so will the trajectory of the water that streams from a roof through a crevice or crease during a storm. Study your roof and how it expels rain water before you install your gutterless rain chain. Choose a location or alternatively enter a known intensity for a 1 in 100 year rainfall with a five minute time of concentration.

A small rain will fall directly off of the roof where a heavy rain may shoot some distance off of the roof as it falls to the ground. Alumasc s leading drainage calculator allows architects specifiers and building engineer s to design and quantify all their rainwater drainage requirements using this dedicated software. If using the smaller down pipe option the length of the conical section is calculated using the bernoulli theorem as in a venturi meter with the coefficient of discharge 0 95. The purple roofs green roof hydrologic modeler is a free tool for fast and reliable green roof design.

Wind driven rain is the term used to describe how much rain hits a vertical surface for example the wall of a building. The storm s trajectory turned south overnight and its eye is no longer predicted to pass directly over corpus christi but strong winds and rain were expected to slam into the city of more than. Category 2 and 3 flat roof drainage linked to local rainfall data. The roof slopes in only one direction 222 in length and the slope of the roof is per 1.

Sea temperatures and there are outputs such as the trajectory of the storm wind speed at landfall and anticipated rainfall volume once the hurricane reaches shore. Dirt particles are unable to obtain a hold on a roof coated with rejuva and will simply flow off with rainfall. Making the rain water head deeper will also make it longer to accommodate the water trajectory. Your roof tiles will remain clean and attractive for many years even on sides which are particularly exposed to the weather like on the north facing side or roof tiles in the shade as well as in areas with high air humidity or sea salt penetrated air.