Green Roof Curve Number Soil C

94 92 88 85 77 reprinted from the 2000 maryland stormwater design manual mde 2000 2009 chapter 5 p.

Green roof curve number soil c.

The curve number for infiltration trench is adapted to be 61 in accordance with the. P q s q p actual retention potential retention actual runoff total rainfall where cn 25400 254 s. 2 3 4 6 8. T1 assessing curve number uncertainty for green roofs in a stochastic environment.

Curve number cn method is stating a following relationship between rainfall and runoff. Au yoo chulsang. Impervious surfaces are assigned cn of 98. For a more detailed and complete description of land use curve numbers refer to chapter two 2 of the soil conservation service s technical release no.

2 april 2010 prepared for the southern california stormwater monitoring coalition in cooperation with the state water resources control board by the low impact development center inc. The soil had a total porosity of 50 6. 1 composite cns may be computed for other combinations of open space cover type. Influence of growth media soil water retention 16 18 20 note.

Despite substantial performance evidence in the literature the lack of a curve number cn or volumetric runoff coefficient c v to apply to prescribed methodologies for planning and regulatory submissions may be perceived as a barrier for implementation. Au huang w. Modeling of green roof as a shallow figure 3b. Elements in green roofs subject to uncertainty considered are rainfall characteristics i e.

Au tung y. The site was in athens georgia annual rainfall of 48 5 inches. Effective cns for extensive green roofs roof thickness in. 2007 derived curve numbers for studied green roofs.

N2 curve number cn is well known by hydrologists for estimating rainfall induced runoff from a catchment. Paired rainfall runoff data were analyzed for up to 21 living roofs with varying. 5 42 since 2009 the number of different green roof systems on the market has expanded greatly. Au you l.

55 210 vi tr 55 second ed june 1986. Amount and inter event dry period soil plant climate. The resulting curve number was 86 compared to 98 for an impervious roof. The green roof used to establish the curve number was composed of a 3 deep soil 55 expanded slate 30 sand and 15 organic matter.