**Appendix A**

**Figure A1.** Data employed to estimate typical and intense rainfall conditions. (**a**) Typical rainfall conditions (from 23 to 29 October 1987). (**b**) Intensity–frequency–duration (IFD) curve for intense rainfall (data from 2 June 1995).


2 Recycled PET bottles \$97.59 3 Recycled rubber \$103.16 4 Basalt gravel \$104.49

#### **References**


© 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
