decking and rainfall coefficient

Flat Roof Falls Drainage Provision in Designs - Bauder

Falls on a roof can be achieved by adjusting the height of the supporting beams or purlins by using tapered supports or by the addition of firring pieces before the deck is laid. In the case of a cast in-situ concrete slab falls are normally provided by use of a screed.【Get Price】


In a warm climate boards expand at a maximum of 1.5 mm/m of composite deck board. Expansion gaps will differbetween cool and Expansion gaps will differbetween cool and warm climates.【Get Price】

Computation of Runoff Rate from a Watershed: 3 Methods.

Runoff coefficient is the fraction of rainfall converting into surface runoff. It is defined as the ratio of the runoff and rainfall. It is a dimensionless factor. Its value depends on the land use and soil types (Table 2.1)【Get Price】

Runoff Coefficient (C) Fact Sheet

The runoff coefficient (C) is a dimensionless coefficient relating the amount of runoff to the amount of precipitation received. It is a larger value for areas with low infiltration and high runoff (pavement steep gradient) and lower for permeable well vegetated areas (forest flat land). Why is It Important?【Get Price】

UPM ProFi Deck Technical Specification

Based on an expansion coefficient of 0.040 mm per 1˚ C per 1 m length. We recommend applying the same values for the UPM ProFi Alu Rail. Unlike conventional wpc and timber decks UPM ProFi Deck products are virtually lignin free and will therefore not suffer from the usual “greying”. Instead over the years the colours will fade slightly.【Get Price】

Conventions for U-valuecalculations

the thermal resistance of the floor deck and then use that resistance in a calculation according to BS EN ISO 13370 to allow for the effect of the ground. 2.4 Thermal bridging at junctions and around openings Thermal bridges fall into two categories: (i) repeating thermal bridges (eg timber joists or rafters mortar joints and【Get Price】

17-1 DECK DRAINAGE DESIGN - California

analysis is obtained by the Rational Method which converts rainfall intensity for the design frequency storm to run-off by the formula: Q = CiA (1) where Q = Design Discharge in cubic feet per second; C = Coefficient of Runoff = 1.0 for bridge decks; i = Average rainfall intensity in inches per hour for a given frequency and for the duration【Get Price】

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