ISHS Acta Horticulturae 643: International Conference on Urban Horticulture
GOOD REASONS FOR ROOF PLANTING - GREEN ROOFS AND RAINWATER |
| Author: | W. Kolb |
| Keywords: | evaporation, substrate, runoff coefficient, single-stratum construction, multi-strata construction |
| Abstract:
This presentation is expected to be an argumentative basis for a better acceptance of roof planting based on measurements made with green roofs. The experiments show that annual evaporation factors of 45% – 70% of the rainfalls can be achieved. When choosing ideal substrates an essential reduction of the peak runoff is registered. Depending on the rating of rainfalls with 100, 200 and 300 l/(s*ha) reductions of the peak runoff as much as 52%, 29% and 17% could be registered when using efficient substrates. The runoff coefficient declines with increasing watercourse. Considering a watercourse of 10,0 m single-stratum construction techniques show a 45% better runoff coefficient than multi-strata construction techniques. | |
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