Difference between revisions of "Talk:Green Roofs Design Guide"

From LID SWM Planning and Design Guide
Jump to navigation Jump to search
Line 8: Line 8:
|-
|-
|colspan="2" |'''Slope (%)'''
|colspan="2" |'''Slope (%)'''
|<= 10 || <= 10 || < 5 (requires sloped underdrain),                5-20 (gravity drainage),                                > 20 lath grid is required ||  ||  ||  || See Table A.6-3 for Media specs (Below) ||  ||  ||  ||  ||  ||  ||  ||  
|<= 10 || <= 10 || < 5 (requires sloped underdrain),                5-20 (gravity drainage),                                > 20 lath grid is required ||  ||  ||  || See Table 2 for Media specs (Below) ||  ||  ||  ||  ||  ||  ||  ||  
|-
|-
|colspan="2" |'''Green roof assembly Weight(kg/m2)''' || 80 ||  || 290-967.7 (Intensive),                        129.1-169.4 (Extensive) ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  
|colspan="2" |'''Green roof assembly Weight(kg/m2)''' || 80 ||  || 290-967.7 (Intensive),                        129.1-169.4 (Extensive) ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  ||  
Line 53: Line 53:


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


|-
|-
Line 90: Line 90:


{| class="wikitable"
{| class="wikitable"
! !!  !!  !!  !! Table 2: !! Example green roof media specifications !!  !!  !!
!colspan="2" style="background:cyan; color:black"| Table 2:Example green roof media specifications  
|-
|-
| Parameter ||  ||  ||  || Specification
| Parameter || Specification
|-
|-
| Noncapillary pore space at field capacity ||  ||  ||  || 155  (vol.)
| Noncapillary pore space at field capacity || 155  (vol.)
|-
|-
| Moisture content at field capacity ||  ||  ||  || 12% (vol.)
| Moisture content at field capacity || 12% (vol.)
|-
|-
| Maximum media water retention ||  ||  ||  || 30% (vol)
| Maximum media water retention || 30% (vol)
|-
|-
| Alkalinity, CaCo3 equivalents ||  ||  ||  || 2.50%
| Alkalinity, CaCo3 equivalents || 2.50%
|-
|-
| Total organic matter by wet combustion ||  ||  ||  || 3-15% (dry wt.)
| Total organic matter by wet combustion || 3-15% (dry wt.)
|-
|-
| pH ||  ||  ||  || 6.5-8.0
| pH || 6.5-8.0
|-
|-
| Soluble Salts ||  ||  ||  || 6 mmhos/cm
| Soluble Salts || 6 mmhos/cm
|-
|-
| Cation exchange capacity ||  ||  ||  || 10 meq/100g
| Cation exchange capacity || 10 meq/100g
|-
|-
| Saturated hydraulic conductivity for single media assemblles ||  ||  ||  || 0.05 in/min
| Saturated hydraulic conductivity for single media assemblles || 0.05 in/min
|-
|-
| Clay fraction (2 micron) ||  ||  ||  || 0
| Clay fraction (2 micron) || 0
|-
|-
| Pct. Passing US#200 sieve (i.e., silt fraction) ||  ||  ||  || 5%
| Pct. Passing US#200 sieve (i.e., silt fraction) || 5%
|-
|-
| Pct. Passing US#60 sieve ||  ||  ||  || 10%
| Pct. Passing US#60 sieve || 10%
|-
|-
| Pct. Passing US#18 sieve ||  ||  ||  || 5%-50%
| Pct. Passing US#18 sieve || 5%-50%
|-
|-
| Pct. Passing 1/8 inch sieve ||  ||  ||  || 20%-70%
| Pct. Passing 1/8 inch sieve || 20%-70%
|-
|-
| Pct. Passing 3/8 inch sieve ||  ||  ||  || 75%-100%
| Pct. Passing 3/8 inch sieve || 75%-100%
|}
|}

Revision as of 18:39, 26 September 2017

LID Practice CANADA United States
Green Roof CVC+TRCA (Factsheets-2010)[1] LID-SWM Guide 2010[2] 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
Slope (%) <= 10 <= 10 < 5 (requires sloped underdrain), 5-20 (gravity drainage), > 20 lath grid is required See Table 2 for Media specs (Below)
Green roof assembly Weight(kg/m2) 80 290-967.7 (Intensive), 129.1-169.4 (Extensive)
Growing medium depth (cm) 4-15 4-15
Intensive > 15 > 15 20-60
Extensive <= 15 <= 15 10-15
Fertilizer applications (nitrogen/m2) < = 5.0 g
Porosity of the drainage Layer (%) > = 25% > = 25%
Ratio of impervious area to treatment facility area, % 1:1 CDA:GR size +25% DA not limit, generally no runoff from surrounding area
Plant density Seeds >= 325/m2, Cuttings>= 12 kg/100m2, Plugs>= 11/m2
Filter Media
Organic 25% < 5% <20% < 15% <20% < 15% See Table 1 for media parameter ranges < 15% < 20% 25% 20%
Light Weight in-organic 75% 95-100 % 80-90% 100% > 85% 80-90% 85-100 % 80-90 % 80-90 % 50%
CEC > 10 > 10 > 10
pH 6.5-8 6.5-7.8 6.5-8
Sand S: 95%; D:85-95%
Silt S: <5%; D: 5-15%
Clay 0%
P-Content E: 2-10; I:2-15
Topsoil 25%
Porous Material 70%
Digested fiber 10%
Table 1: Recommended green roof growing medium parameter ranges
Parameter Extensive green roofs Intensive green roofs
pH 6.5 to 7.8 6.5 to 7.8
Nitrate-N (mg/L) 1 to 4 2 to 32
Ammonium-N (mg/L) 0.1 to 0.8 0.1 to 0.8
Nitrogen (total) (mg/L) 2 to 8 2 to 32
Phosphorus (total) (mg/L) 2 to 10 2 to 15
Potassium (mg/L) 8 to 32 8 to 64
Calcium (mg/L) 100 to 300 100 to 300
Magnesium 10 to 80 10 to 80
Iron (mg/L) 8 to 32 8 to 32
Manganese 1 to 8 1 to 8
Boron (mg/L) 0.04 to 0.6 0.04 to 0.6
Sodium (mg/L) <20 <20
Zinc (mg/L) 1 to 10 1 to 10
Soluble salts (mmhos/cm) 0.4 to 1.2 0.4 to 1.2
Sodium Absorption Ratio (SAR) <2 <2
Table 2:Example green roof media specifications
Parameter Specification
Noncapillary pore space at field capacity 155 (vol.)
Moisture content at field capacity 12% (vol.)
Maximum media water retention 30% (vol)
Alkalinity, CaCo3 equivalents 2.50%
Total organic matter by wet combustion 3-15% (dry wt.)
pH 6.5-8.0
Soluble Salts 6 mmhos/cm
Cation exchange capacity 10 meq/100g
Saturated hydraulic conductivity for single media assemblles 0.05 in/min
Clay fraction (2 micron) 0
Pct. Passing US#200 sieve (i.e., silt fraction) 5%
Pct. Passing US#60 sieve 10%
Pct. Passing US#18 sieve 5%-50%
Pct. Passing 1/8 inch sieve 20%-70%
Pct. Passing 3/8 inch sieve 75%-100%