View source for Talk:Green Roofs Design Guide

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!colspan="2" style="background:white; color:black"| LID Practice
!colspan="3" style="background: orange; color: black"|CANADA
!colspan="12" style="background: brown; color: white"|United States 
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!colspan="2" style="backgroung=green; color:white"|Green Roof|| CVC+TRCA (Factsheets-2010)<ref>http://www.creditvalleyca.ca/wp-content/uploads/2012/02/lid-swm-guide-apdxa-green-roofs.pdf</ref>||LID-SWM Guide 2010<ref> http://www.creditvalleyca.ca/wp-content/uploads/2014/04/LID-SWM-Guide-v1.0_2010_1_no-appendices.pdf</ref>|| LID-Design Guide Edmonton- 2014 || New York State SWM Design Manual-2015||Massachusets SW BMP-2013 || District of Columbia-SWM Guidebook-2010 ||San Diego LID Handbook-2014||Alabama LID Handbook-2013|| W. Virginia-SWM design guidance manual-2012||Rhode Island-SW design & Installation Standards Manual-2012|| Minnesota SW Manual-2016  || Tennessee-LID Development-SWM 2016 || Texas-LID Technical Guidance Manual-2013 || Oregon SWM Manual-2014||Oregon State Univ. Fact Sheets-2011
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|colspan="2" |'''Slope (%)'''
|<= 10 || <= 10 || < 5 (requires sloped underdrain),                5-20 (gravity drainage),                                > 20 lath grid is required ||  ||  ||  || See Table 2 for Media specs (Below) ||  ||  ||  ||  ||  ||  ||  || 
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|colspan="2" |'''Green roof assembly Weight(kg/m2)''' || 80 ||  || 290-967.7 (Intensive),                        129.1-169.4 (Extensive) ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 
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|colspan="2" |'''Growing medium depth (cm)''' || 4-15 || 4-15 ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 
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|colspan="2" style="text-align: right;|Intensive || > 15 || > 15 || 20-60 ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 
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|colspan="2" style="text-align: right;|Extensive || <= 15 || <= 15 || 10-15 ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 
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|colspan="2" |'''Fertilizer applications (nitrogen/m2)''' || < =  5.0 g  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 
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|colspan="2" |'''Porosity of the drainage Layer (%)''' || > = 25% || > = 25% ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 
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|colspan="2" |'''Ratio of impervious area to treatment facility area, %''' ||  || 1:1 ||  ||  ||  || CDA:GR size +25% ||  ||  ||  || DA not limit, generally no runoff from surrounding area ||  ||  ||  ||  || 
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|colspan="2" |'''Plant density''' ||  ||  || Seeds >= 325/m2,                Cuttings>= 12 kg/100m2,    Plugs>= 11/m2 ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 
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|colspan="2" |'''Filter Media''' ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 
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|colspan="2" style="text-align: right;|Organic ||  ||  ||  || 25% || < 5% || <20% ||  || < 15% || <20% || < 15% || See Table 1 for media parameter ranges || < 15% || < 20% || 25% || 20%
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|colspan="2" style="text-align: right;|Light Weight in-organic ||  ||  || || 75% || 95-100 % || 80-90% || 100% || > 85% || 80-90% || 85-100 % ||  || 80-90 % || 80-90 % || 50% || 
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|colspan="2" style="text-align: right;|CEC ||  ||  ||  ||  ||  ||  || > 10 ||  ||  || > 10 ||  ||  || > 10 ||  || 
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|colspan="2" style="text-align: right;|pH ||  ||  ||  ||  ||  ||  || 6.5-8 ||  ||  ||  || 6.5-7.8 ||  || 6.5-8 ||  || 
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|colspan="2" style="text-align: right;|Sand ||  ||  ||  ||  ||  ||  ||  ||  ||  || S: 95%;  D:85-95% ||  ||  ||  ||  || 
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|colspan="2" style="text-align: right;|Silt ||  ||  ||  ||  ||  ||  ||  ||  ||  || S: <5%;  D: 5-15% ||  ||  ||  ||  || 
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|colspan="2" style="text-align: right;|Clay ||  ||  ||  ||  ||  ||  ||  ||  ||  || 0% ||  ||  ||  ||  || 
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|colspan="2" style="text-align: right;|P-Content ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || E: 2-10; I:2-15 ||  ||  ||  || 
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|colspan="2" style="text-align: right;|Topsoil ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 25% || 
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|colspan="2" style="text-align: right;|Porous Material ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 70%
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|colspan="2" style="text-align: right;|Digested fiber ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  || 10%

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!colspan="3" style="background:cyan; color:black"| Table 1: Recommended green roof growing medium parameter ranges 

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| Parameter || Extensive green roofs || Intensive green roofs 
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| pH || 6.5 to 7.8 || 6.5 to 7.8  
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| Nitrate-N (mg/L) || 1 to 4 || 2 to 32 
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| Ammonium-N (mg/L) || 0.1 to 0.8 || 0.1 to 0.8 
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| Nitrogen (total) (mg/L) || 2 to 8 || 2 to 32 
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| Phosphorus (total) (mg/L) || 2 to 10 || 2 to 15 
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| Potassium (mg/L) || 8 to 32 || 8 to 64  
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| Calcium (mg/L) || 100 to 300 || 100 to 300  
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| Magnesium || 10 to 80 || 10 to 80 
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| Iron (mg/L) || 8 to 32 || 8 to 32 
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| Manganese || 1 to 8 || 1 to 8 
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| Boron (mg/L) || 0.04 to 0.6 || 0.04 to 0.6 
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| Sodium (mg/L) || <20 || <20 
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| Zinc (mg/L) || 1 to 10 || 1 to 10 
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| Soluble salts (mmhos/cm) || 0.4 to 1.2 || 0.4 to 1.2  
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| Sodium Absorption Ratio (SAR) || <2 || <2 
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{| class="wikitable"
!colspan="2" style="background:cyan; color:black"| Table 2:Example green roof media specifications 
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| Parameter || Specification
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| Noncapillary pore space at field capacity || 155  (vol.)
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| Moisture content at field capacity || 12% (vol.)
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| Maximum media water retention || 30% (vol)
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| Alkalinity, CaCo3 equivalents || 2.50%
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| Total organic matter by wet combustion || 3-15% (dry wt.)
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| pH || 6.5-8.0
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| Soluble Salts || 6 mmhos/cm
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| Cation exchange capacity || 10 meq/100g
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| Saturated hydraulic conductivity for single media assemblles || 0.05 in/min
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| Clay fraction (2 micron) || 0
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| Pct. Passing US#200 sieve (i.e., silt fraction) || 5%
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| Pct. Passing US#60 sieve || 10%
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| Pct. Passing US#18 sieve || 5%-50%
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| Pct. Passing 1/8 inch sieve || 20%-70%
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| Pct. Passing 3/8 inch sieve || 75%-100%
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