Storm Water Management Report
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LifeMedGreenRoof Project Storm water management LIFE12ENV/MT/000732 Table of Contents List of tables........................................................................................................................................... iii Table of figures ...................................................................................................................................... iv 1. Introduction .................................................................................................................................... 1 2. Objectives ....................................................................................................................................... 2 3. Methodology .................................................................................................................................. 2 Experimental set up - MALTA ................................................................................................................. 2 Experimental set up - ITALY .................................................................................................................... 5 Substrate Characteristics ........................................................................................................................ 7 Monitoring of chemical properties of substrates over time................................................................. 14 Monitoring of Maltese substrates ................................................................................................ 14 Monitoring of Italian substrates ................................................................................................... 15 4. Meteorological analysis ............................................................................................................... 17 MALTA ................................................................................................................................................... 17 Test period ............................................................................................................................................ 17 Weather conditions – background information ................................................................................... 17 The weather during 2015-2016-2017 ................................................................................................... 21 Weather during 2015 .................................................................................................................... 21 Weather during 2016 .................................................................................................................... 22 Weather during 2017 .................................................................................................................... 22 ITALY ...................................................................................................................................................... 23 Test period ............................................................................................................................................ 23 Weather conditions – background information ................................................................................... 23 Weather during 2015 .................................................................................................................... 27 Weather during 2016 .................................................................................................................... 29 5. Data analysis ................................................................................................................................. 32 MALTA – University of Malta ................................................................................................................ 32 Precipitation .......................................................................................................................................... 32 Storm water run-off .............................................................................................................................. 35 ITALY – Fondazione Minoprio ............................................................................................................... 39 Data analysis and storm water run-off ................................................................................................. 39 Other tests ............................................................................................................................................ 70 Run-off Water Quality- Malta ............................................................................................................... 75 Run-off Water Quality - Italy ................................................................................................................. 77 i | P a g e 6. Conclusion .................................................................................................................................... 78 Annex 1 ................................................................................................................................................. 80 Monthly precipitation and water run-off, Maltese green roof ..................................................... 80 Annex 2 ................................................................................................................................................. 86 Precipitation and run-off association, Maltese green roof ........................................................... 86 Annex 3 ................................................................................................................................................. 88 Data from rainfall simulator tests ................................................................................................. 88 References .......................................................................................................................................... 131 Bibliography........................................................................................................................................ 132 ii | P a g e List of tables Table 1 Tenax DP1 data sheet ................................................................................................................. 5 Table 2 Components and percentages of use (volumetric) for the selected growing media ................ 7 Table 3 Particle size distribution for the selected growing media .......................................................... 8 Table 4 Chemical properties for the selected growing media .............................................................. 10 Table 5 Physical properties for the selected growing media ................................................................ 10 Table 6 Other properties for the selected growing media ................................................................... 11 Table 7 Experimental Maltese mix with local components .................................................................. 13 Table 8 pH and salinity levels of the various substrates tested ............................................................ 14 Table 9 Chemical properties of Maltese substrates, samples taken from the demonstration green roof - March 2017 ................................................................................................................................. 15 Table 10 Chemical properties of the various substrates used taking the plant species into consideration ........................................................................................................................................ 16 Table 11 Highest precipitation ever recorded on a monthly basis during the period 1922-2010 in comparison with the mean monthly precipitation. Adapted from Galdies (2011) .............................. 18 Table 12 Average maximum and minimum temperatures, and maximum and minimum temperatures on a monthly basis (1947-2010) Adapted from Galdies (2011) ............................................................ 20 Table 13 Precipitation and run-off as recorded between May 2016 and June 2017 ........................... 34 Table 14 Total precipitation and run-off per month ............................................................................. 35 Table 15 Data pertaining to the performance of the experimental green roof in terms of water management. ........................................................................................................................................ 36 Table 16 Average temperature and precipitation values (July 2016- June 2017 – Fondazione Minoprio (IT) ......................................................................................................................................................... 39 Table 17 Total precipitation, run off and % water retention for the period of study (July 2016 - June 2017) ..................................................................................................................................................... 44 Table 18 High rain intensity over the monitored period (Fondazione Minoprio) ................................ 51 Table 19 Daily values for rain, run-off, Coefficient, and substrate water content (Fondazione Minoprio) .............................................................................................................................................. 52 Table 20 Data from the rainfall simulator ............................................................................................