38
35°06’37.2”N 89°46’50.2”W
39
The initial GIS mapping phase was completed as a group project alongside classmates Harmon Duke and Kent Moore.
Wolf River Watershed
Stormwater Detention Facility Using GIS analysis, the six counties encompassing the Wolf River were analysized to best locate a facility to mitigate flooding. A marked increase in flooding frequency in areas along the Wolf River has been experienced because of the continual development within the floodplain, the rise of the installation of impermeable surfaces in the built environment and the proliferation of substantial rain events. The first pair of maps show the elements that most contribute to this flooding, including the 100-year floodplain boundary, areas of development by intensity and road infrastructure for the six counties surrounding the Wolf River Watershed. Through our mapping compo40
sition, we also sought to reveal sites within the Wolf River Watershed that would be ideal locations to investigate the creation of a regional stormwater detention facility that would reduce the flood hazard to the neighboring developments by managing periodic flooding. The second set of maps display the land characteristics of the region that determine the feasibility of placing such a facility on a given site. These were mainly soil properties, location of existing wetlands and current land use. We additionally wanted to connect the stormwater facility to ex-
isting public infrastructure in the hopes that it would increase access to the site to better allow it to function as an amenity to the community when not inundated. Focusing in on Shelby County, the last two maps show the location of existing greenway trails, public parks and schools within Shelby County.
shelby
Weig h
O v e r l a y Pe r c
45%
eman ard
r
M i s s i s s i pp i
R i vve
te d
ge
h
en t a
fayette
Most Likely to Flood More LIkely to Flood Likely to Flood Water Bodies Roadways
marshall
High Intensity Development Medium Intensity Development Water Bodies 500 Year Floodplain 100 Year Floodplain 50 Year Floodplain Roadways
t ipp a h
0.00 0.75 2.25
benton
0.00 0.75 2.25 3.75
7.50
7.50
shelby
O v e r l a y Pe r c
35%
eman ard
r
M i s s i s s i pp i
R i vve
te d
ge
h
en t a
fayette
Weig h
3.75
Public Property Vacant Properties Soil Data Water Bodies Wetlands Roadways
marshall
Best Site Qualities Better Site Qualities Good Site Qualities Water Bodies Roadways
benton
t i ppah
0.00 0.75 2.25
0.00 0.75 2.25 3.75
7.50
7.50
te d
O v e r l a y Pe r c
ge
20%
en t a
Weig h
3.75
SHELBY
Best Connectivity Better Connectivity Good Connectivity Water Bodies Roadways
Schools Public Parks Water Bodies Existing Greenways Roadways
Mi
ss iss
0.00 0.75 2.25
ippi Riv
er 0.00 0.75 2.25
3.75
3.75
7.50
7.50
41
Population : 45 ,00
pp
Riv e
r
Mis
i
0
Popu
l
at
si sis
io n 1 5,0 0 0
RAL Popu lat ion : 66 8
1
PARK
BLU EIGH FF
8 ,22
0.0 0.5 1.5 2.5
WA
GE BLUE
COL
G
3 L
IE R V
DIN
PEA
RID
Roadways Watershed Boundary Best Site Location Better Site Location Good Site Location Public Parks Wetlands Wolf River Waterbodies Selected Sites
2
Y
5.0
IL L E L A N
COMBINED MAP OF THREE GIS WEIGHTED OVERLAYS WITH CRITICAL INFORMATION HIGHLIGHTED
Stormwater Facility Site Analysis This map is a compilation of the three previously mentioned overarching thematic pieces of our analysis puzzle. It overlays the areas most at risk to flooding with those that are best for stormwater facility siting and have the greatest accessibility to public infrastructure. It excludes the results to those within the Wolf River Watershed boundary to eliminate data outside of the scope of the original dilemma. We investigated the clusters of results that represented the places most likely to meet the previously determined requirements. We cross-referenced their current site ownership and reexamined their adherence to our guidelines. As a result, we selected three sites that each uniquely met our goals of the investigation.
43
at h Ks Hig ely
fALAYA
road Rail
wA VER
LY
Sout h Ger man town Road
Mod era t
EXISTING sILT loA M SO IL S ERI ES P
ES TAG CEN ER
Ja ck
so nA ve n
JFK Park
Ro ad
Moderately Low to
ue
Ra leig hL aG ra ng e
NN
bO
C O LLIN
er Riv olf W
e
ls Che
u ven ea A
Wells Station Elementary
Building Footprint Public Parks Wetlands Wolf River Public Schools Wolf River Greenway Site Boundary 2011 Flood Inundation
ov
to
0
Roa d gh ro u Ki mb
Plea sant View Roa d
I-4
Building Footprint Public Parks Wetlands Wolf River Public Schools Wolf River Greenway Site Boundary 2011 Flood Inundation
S
n
Pi
ke
Wo lf R i ve r
g in
C
Kingsbur Elementary
0.0’
0.0’
312.5’
312.5’
625.0’
625.0’ McCrory Avenue
1250.0’
1250.0’
1
O
ur potential sites were selected with aquifer recharge in mind. All soils on our site are silt loam. Though this soil is not ideal for aquifer recharging silt loam soils are still a well-drained soil type which can be used for aquifer recharge. A second factor in site selections were Ksat values. Ksat is the symbolic representation for saturated hydraulic conductivity. This is referring to the ability of soil series to absorb, filter, and allow water to reach aquifers below. Soil series like Waverly, Falaya, and Collins are moderately high to high Ksat so water easily permeates and reaches the aquifer. Other soil groups like Calloway, Grenada, and Bonn are moderately low to moderately high. Though not as desirable as a high Ksat these soils are still easily permeated. The first 44
site, termed Raleigh Bluff Park, was chosen because of the multiple small ponds and wetland habitats present along with dense woodlands. A forseen connection and expansion across the Wolf River to the existing John F. Kennedy Park could be achieved with a greenway linking the Raleigh community to Nutbush. The second site was selected for its proximity to neighborhoods, Shelby Farms, and nearby parks and greenspaces. Named the Pea Ridge Blueway, it has future possibilities to serve as a community natural area and could aid in future development by decreasing flooding frequency over a larger area. This site would serve as a stop or checkpoint along the proposed Wolf River Blueway. Collierville Landing is the third site that was selected. The site and surrounding areas are
DA gRENA Moderately hENRY
EXISTING sILT loAM SOIL S ERIE S PE RCE
ely
Lo
L sE
RIE Sp
to
ENT AGE
E
South Sangra Road
rat
Cameron Brown Park
w
RC
Levee Road
Building Footprint Public Parks Wetlands Wolf River Public Schools Wolf River Greenway Site Boundary 2011 Flood Inundation
Mode
fALAYA
eXISTING sILT lOAM sOI
S
ERLY
n South Housto
LIN wAV
St. George’s Independent School
ol W
Mod
erat
ely High Ksat
S
wAV
rd va le ou rB ve i fR
0’ 75’ 200’ 325’
n Farmi gton Road
2
1250’
3
heavily forested, and farmland lies just north of the site across the Wolf River. Wolf River Boulevard cuts the site into two parts. To the South is a seasonal wetland habitat which could be utilized as a neighborhood greenspace along the perimeter.
Pictured above from left to right is contextual base maps of Raleigh Bluff Park, Pea Ridge Blueway and Collierville Landing showing each site’s perimeter, wetland designation, Ksat values and proximity to public parks and schools. 45
high ksa t
WAY LLO cA
ES AG NT
C OL
Baze More Road
high t o
er Riv olf W
Y E RL
T
he proposition of a Regional Stormwater Detention Facility was further developed so that it would become a multi-faceted amentiy to the community by allowing for connections across the site, forming select areas of recreation, creating educational opportunities and increasing the biodiversity of the existing ecological systems. This section shows the first layer of detention on the edge of the park furthest upstream. Gabion 46
walls stabilize the riverbank and allows for the addition of a compressed gravel bike trail. They also aid in the creation of staircases in specific sections to provide upclose viewing of the Wolf River. An inlet allows for inflow from the Wolf River during large rain events to into the first Detention Basin, which provides storage and allows for sediments and pollutants to be filtered out of the water. After reaching its maximum capacity, the water could overflow into the
constructed Marshland. This is followed by an open air Educational borhood that has previously passed through a permeable parking Pavilion that would allow visitors to learn about the facility and also lot. When it reaches its maximum capacity, it also oveflow into the serve as a gathering space. An open tree canopy would allow for constructed Marshland. passive recreation and outdoor seating would create opportunites for social interactions. A terraced garden of infiltration planters would allow for physical interaction with a second Detention Basin. This Basin primarily filters water coming from the adjacent neigh47
rkw Germ anto wn P a South
6 6
5
5
2
2
Friendly Flooding Wetland Park
Wolf Ri ve
r Boulev ard
Site Plan Legend 1 2 3 4 5
ne Road Forest Hill-Ire
6
4 4
1
3
3
1
Blue-green Way Pedestrian Trails Integrated Oxbows Additional Sediment Forebay Tiered Detention Basin Vehicular Connection
T
he purpose of this project was to develop a programmatic proposal of a vacant site in Memphis, TN that would serve as a pilot project exploring ways to mitigate flooding experienced within the Wolf River Watershed with a constructed wetland serving as a Regional Detention Facility under the guise of a floodable park. This site was selected following an extensive process using GIS modeling to derive a location that was currently flooding, near development endangered by said flooding, within close proximity of an existing wetland, having soils conducive for aquafer
50
recharging and within walking distance of equally addressed through the development existing public amenities. Out of the range of of the park. These elements include Water options provided by this investigation, this Quality, Habitat, Circulation and Education. particular plot of approximately 750 Acres located between Germantown and Cordova was chosen due to its majority ownership by the Wolf River Conservancy, its Silty Loam soil composition, and its adjacent Northwestern edge to Shelby Farms. The primary goal of this project was most obviously flood prevention, though several other key elements were brought to light during the inventory and analysis of site which, though secondary, are each integral to the overall value of the design and were
Parkw ay rmant own South Ge
6
ne Road Forest Hill-Ire
5
2
4
1
Wolf River
3 Boulevard
RENDERED MASTER PLAN The purpose of this project was to develop a programmatic proposal of a vacant site in Memphis, TN that would serve as a pilot project exploring ways to mitigate flooding experienced within the Wolf River Watershed with a constructed wetland serving as a Regional Detention Facility under the guise of a floodable park. This site was selected following an extensive process using GIS modeling to derive a location that was currently flooding, near development endangered by said flooding, within close proximity of an existing wetland, having soils conducive for aquifer recharging and within walking distance of existing public amenities. Out of the range of options provided by this investigation, this particular plot of approximately 750 Acres located between Germantown and Cordova was chosen due to its majority ownership by the Wolf River Conservancy, its Silty Loam soil composition, and its adjacent Northwestern edge to Shelby Farms. The primary goal of this project was most obviously flood prevention, though several other key elements were brought to light during the inventory and analysis of site which, though secondary, are each integral to the overall value of the design and were equally addressed through the development of the park. These elements include Water Quality, Habitat, Circulation and Education. In order for the issue of Water Quantity to be addressed, extensive regrading of the site was proposed to connect the existing functioning oxbows to allow water to inundate the site sooner than current topography allows. This will help alleviate the pressure on the capacity of the Wolf River even prior to preliminary flood stages. Several tiered detention basins were carved into the Western side of the site, responding in shape to the largest existing oxbow, to allow for greater storage capacity even after water levels return to normal following larger rain events. The Wolf River is listed in the 2016 Tennessee 303(d) as having a Category 5 Impairment with a Fishing Advisory currently posted. This impairment is due to the presence of pollutants such as phosphorus, mercury, chlordane, dioxins, siltation, polychlorinated biphenyls and Escherichia coli in excessive amounts which have resulted in a river that is not meeting more than one of its uses. Pollutant removal from the water was recommended by initiating sedimentation and phytoremediation. This takes form in the construction of weir systems to slow runoff from the neighborhoods to the North which is then diverted into sediment forebays.
Multiple channels from the extended oxbows dissipate into a Wet Prairie where plants such as Duckweed and Ragweed will aid in the removal of heavy metals from the water and settled sediments. Further investigation into specific species most suitable for phytoremediation will need to occur to comprise a more comprehensive plant palette moving forward. The existing site hosts a Bottomland Hardwood Forest with the addition of several extraneous uplands species. As this area is a currently functioning Habitat for wildlife, great care was taken in understanding the consequences of each design intervention. For this reason, specific areas within the site were designated for habitat preservation. Though much of the site will be re-sculpted in the process of increasing its storage capacity, and will result in the removal of existing vegetation, this creates the opportunity for enhancing the biodiversity and replanting in such a way that increases its appeal to wildlife. This will allow for the removal of invasive species on the site such as Privet, Japanese Honeysuckle and Multiflora Rose. The creation of the Wet Prairie will itself be a great attraction for overwintering waterfowl such as Mallard and Wood Ducks. Plant species would need to be organized into communities and placed within the proper riparian zone upon the completion of the fine-grading of the site. Circulation across the site was created for vehicular traffic by connecting two small neighborhood roads on the Northwestern edge as well as by continuing Forest Hill-Irene Road further South. The primary connection across the site though is found in the form of Blue-green Way, a 10’ paved bike trail following a 50’ City easement created by a 72” underground sewer interceptor. It connects to the parking lot located at the Southeast corner of Shelby Farms, which is currently utilized for accessing the Blue Trail, and curves through the site eventually bridging across the Wolf River and connecting to the bike route taking cyclists from Wolf River Boulevard to Cameron Brown Park. This trail can also be accessed by the Wolf River Nature Area, where a parking lot is currently serving the Germantown Greenway which runs along the Southside of the Wolf River directly adjacent to the site. Future connections to the site could be created by extending the trail Eastward to join the bike lanes along Houston-Levee Road. Interconnected pedestrian trails also meander across the site, sometimes crossing the Blue-green Way or leading to a lifted Observation Gallery. These paths would follow the modified topography in most places and be compacted gravel paths approximately 6’ wide; though suspended bridges would be implemented along the Southern edge of the site to increase accessibility to the trail during periods of inundation. Trail heads would also connect to these paths from vacant lots in the adjoining neighborhoods.
While this site addresses many physical elements with its design, a key piece – Education – cannot be left out. This site is to serve as a demonstration of a Wetland System to the surrounding populace. By facilitating a better understanding of this system, a greater appreciation of the intertwining realities of Water, Habitat and Wildlife will be achieved. To foster such discovery an open-air Educational Pavilion to function as a gathering space with diagrammatic system displays was created with a terraced filtration planter on the South side of the hill that would be accessible to pedestrians for up-close analysis of stormwater practices. To further stimulate learning, markers along each of the trails would describe in detail the purpose of the wetland area, the vegetation that responds best to the conditions created and the wildlife that thrive in the combination.
51
1
4 Additional Sediment Forebay
2
5 Tiered Detention Basin
3
6 Vehicular Connection
passive recreation observation point
passive recreation
passive recreation bridge structure
observation point
observation point
observation point
Proposed Programming Elements
bridge structure observation point
52
observation point
Vehicular circulation across the site was created by connecting two small roads on the Northwestern edge and by continuing Forest Hill-Irene Road further South. The primary connection across the site though is Blue-green Way, a 10’ paved bike trail following a 50’ City easement created by a 72” underground sewer interceptor. It connects to the parking lot located at the Southeast corner of Shelby Farms, which is currently used to access the Blue Trail. It curves through the sit, bridges across the Wolf River and connects to the bike route taking cyclists from Wolf River Boulevard to Cameron Brown Park. This trail can also be accessed by the Wolf River Nature Area, where a parking lot is currently serving the Germantown Greenway. Future connections to the site could be created by extending the trail Eastward to join the bike lanes along Houston-Levee Road. Pedestrian trails also meander across the site, sometimes crossing the Blue-green Way or leading to a lifted Observation Gallery. These paths would follow the modified topography in most places and be compacted gravel. Suspended bridges would be implemented along the Southern edge of the site to increase accessibility to the trail during periods of inundation. Trail heads would also connect to these paths from vacant lots in the adjoining neighborhoods.
entrance archway
passive recreation educational pavilion diagrammatic art display terraced filtration planters outdoor seating public restrooms tire filling station water bottle station
0’ 200’ 400’ 1 in 800’
800’
Proposed Floodwater Stages
54
In order for the issue of Water Quantity to be addressed, extensive regrading of the site was proposed to connect the existing functioning oxbows to allow water to inundate the site sooner than current topography allows. This will help alleviate the pressure on the capacity of the Wolf River even prior to preliminary flood stages. Several tiered detention basins were carved into the Western side of the site, responding in shape to the existing oxbow. Pollutant removal from the water was recommended by initiating sedimentation and phytoremediation. This takes form in the construction of weir systems to slow runoff from the neighborhoods to the North which is then diverted into sediment forebays. Multiple channels from the extended oxbows dissipate into a Wet Prairie where plants such as Duckweed and Ragweed will aid in the removal of heavy metals from the water and settled sediments.
Normal Levels Stage One Stage Two Stage Three
0’ 200’ 400’
800’
The Wolf River is listed in the 2016 Tennessee 303(d) as having a Category 5 Impairment with a Fishing Advisory currently posted. This impairment is due to the presence of pollutants such as phosphorus, mercury, chlordane, dioxins, siltation, polychlorinated biphenyls and Escherichia coli in excessive amounts
1 in 800’
55
Proposed Vegetation Zones
56
The existing site hosts a Bottomland Hardwood Forest with the addition of several extraneous uplands species. As this area is a current Habitat for wildlife, great care was taken to understand the consequences of each design intervention. For this reason, specific areas within the site were designated for habitat preservation. Though much of the rest of the site will be re-sculpted in the process of increasing its storage capacity, and will result in the removal of existing vegetation, this creates the opportunity for enhancing the biodiversity and replanting in such a way that increases its appeal to wildlife. This will allow for the removal of invasive species on the site such as Privet, Japanese Honeysuckle and Multiflora Rose. The creation of the Wet Prairie will itself be a great attraction for overwintering waterfowl such as Mallard and Wood Ducks.
Riparian Prairie Riparian Forest Lowland Flats Wet Prairie Dry Prairie Highland Flats Ridge
0’ 200’ 400’ 1 in 800’
800’
To foster discovery of the site systems, diagrammatic displays would be created like the one on the following page to coincide with the map of the ecosystems. 57
Proposed Plant Communities
This diagram directly correlates to the previous map and displays a list of plant species that would be present within each habitat zone. It additionally describes the wildlife that would best profit from its implementation and shows what each zone accomplishes in terms of both water quality and water quantity. 58
59
33°27’08.7”N 88°47’45.7”W
Stormwater (Best Management Practice)
DESIGN On the LA Department grounds, a stragety for managing stormwater on-site was designed to alleviate the volume of water leaving the MSU campus.
As a Department dedicated to not only teaching but also practicing tenants of Landscape Architecture, the desire to allow the facilties to be a proof of how to create practical, yet beautiful, design interventions to manage stormwater led to this project proposal. Building off of the courtyard improvements currently under construction, we were challenged as a class to carry the sustainable practice approaches across the rest of the site in such a way as to mimic the existing, and to additionally call attention to each intervention so that they could become educational opportunities.
62
SHEET PR
SOLAR PANEL Green Roof
SHEET PR Pervious Pavers with Detention Below-Grade
Partial Infiltration Planter
Partial Infiltration Basin
Partial Infiltration Planter
Cistern Sidewalk
Partial Infiltration Planter Partial Infiltration Basin
Partial Infiltration Planter Runnel
Overhead Structure
Partial Infiltration Basin Flow-Through Basin Cistern
Flow-Through Planter
COU
Flow-Through Basin
Water Feature
Planter with Seating Water Feature
NO.
BUILDING "C"
Flow-Through Basin
D
Flow Through Basin
PROJECT N DATUM: SURVEY: HORIZ SCA VERT SCAL DESIGN: DRAWN: CHECKED: APPROVED DATE:
Flow-Through Planter Sidewalk
SHEET TITL
20'
0
20'
40'
80'
STORMWATER BMP SITE PLAN
63
Areas 9, 10 and 11 are currently being managed within the courtyard as shown and do not need intervention.
FACILITY SIZING DIAGRAM After schematically designating where the runoff from each Area would be managed, it was imperative to understand the amount of stormwater the BMP would need to contain and filter. Calculations were made to arrive at a prescribed square footage to handle each zone. Based on these calculations, specific interventions were then able to be proposed. Clockwise from the top, a green roof was proposed to take the place of the outdated solar panels. partial infiltration planters will take care of the northern edge of the parking lot while infiltration basins will work for the southern part. The water will reach these areas via a system of runnels through the pavement. Rainwater will be tranferred from the roof of the eastern building to the surrounding BMPs with colorful rainspouts that will double as sculp-
64
tural pieces when not being utilitzed. The Southernmost building will function likewise, though its rainspouts will not be ornamented. The roof sides of all three buildings that face the courtyard are managed within the courtyard, primarily by the two large partial infiltration basins to the west. The basin managing Area 11 also has a cistern which collects water that is then used for watering all the plantings during dry periods. To the north of the third building detention was created beneath a series of pervious pavings to handle the water coming off of the concrete pad holding the AC units.
Studio Building: Area 10 - Managed with Partial Infiltration Planter 2500.7 sf x .15 = 375.1 sf Managed by 530 sf Area 11 - Managed with Partial Infiltration Basin 1667.9 sf x .20 = 333.6 sf Managed by 816.3 sf Area 12 - Managed with Partial Infiltration Basin 1680.2 sf x .20 = 336 sf Managed by 484.9 sf Area 13 - Managed with Partial Infiltration Planter 3227.5 sf x .15 = 484.1 sf Managed by 756.9 sf
Other: Area 14 - Managed with Pervious Pavement Detention 700.7 sf x 1 = 700.7 sf Managed with 756.9 sf
Parking Lot: Area 1 - Managed with Partial Infiltration Planter 1384.4 sf x .15 = 207.6 sf Managed by 235 sf
Area 15 - Managed with Green Roof 1453 sf x 1 = 1453 sf Managed with 1453 sf
Area 2 - Managed with Partial Infiltration Planter 1827.8 sf x .15 = 274.2 sf Managed by 447.5 sf
SOLAR PANEL
15
1
2
Area 3 - Managed with Partial Infiltration Basin 5671.7 sf x .20 = 1134.4 sf Managed by 1140 sf Area 4 - Managed with Partial Infiltration Basin 1906 sf x .20 = 381.2 sf Managed by 391
14
3
4
12 13 11 10
5 6
Classroom & Administrative Building: Area 5 - Managed with Partial Infiltration Planter 431.8 sf x .15 = 64.8 sf Managed by 155.2 sf
9 8 7
BUILDING "C"
Area 6 - Managed with Partial Infiltration Basin 637.5 sf x .20 = 127.5 sf Managed by 148.4 sf Area 7 - Managed with Partial Infiltration Basin 2806.9 sf x .20 = 561.4 sf Managed by 579.4 sf Area 8 - Managed with Partial Infiltration Planter 2532.4 sf x .15 = 379.9 sf Managed by 415 sf Area 9 - Managed with Partial Infiltration Basin 5664.2 sf x .20 = 1132.8 sf Managed by 1206.2 sf
20'
0
20'
40'
80'
SHEET PREPARED
Construct
Hydrol
SOLAR PANEL Connect to Downspout
SHEET PREPARED
INV 364.5
Danielle
5.5
INV 36
INV 36
5.5
5.5
5
INV 364
INV 366.
36 IN V
INV 366.5
INV 364.5
INV 365.5
INV 364
Connect to Downspout
4
INV 36
Connect to Existing
INV 365.5
INV 365.5
4.5
INV 364.5
V IN
36
Connect to Existing
INV 363.5
INV 363.5
IN V
INV 362 36
INV 362
Connect to Existing
INV 362
PROJE COURTYARD
Daylight Pipe
3
36
2
INV 362
IN V
INV
361.5
NO.
361.5
Connect to Downspout
PROJECT NO: DATUM: SURVEY: HORIZ SCALE: 1" = 40' VERT SCALE: DESIGN: DRAWN: CHECKED: APPROVED: Novemb DATE:
INV 361
INV 363
Connect to Existing
INV 361.5
REVISION
DESCRIPTION
BUILDING "C"
5 INV 363.
INV 361
INV
.5
INV 364.5
INV 362
INV 361.5
SHEET TITLE
PIPE 20'
STORMWATER BMP PIPE PLAN
66
0
20'
40'
80'
L3
PERVIOUS PAVEMENT
1
Native Soil
Native Soil
Native Soil Compacted Subgrade
8'-0" 15'-0"
2
SHEET PR
10'-0"
PARTIAL INFILTRATION BASIN
SHEET PR
Growing Medium Filter Fabric
6" Perforated Pipe
Geotextile 5'-10"
Rock Check Dam 1'-0" 1'-0"
1'-6"
1'-0"
1' Maximum Ponding Depth Growing Medium Washed Aggregate
1'-0"
6" 6"
1'-1"
Open-Graded Pavement Sand Washed Aggregate
3
DRY SWALE
Existing Building
Downspout
1'-0"
Particle Trap
Outflow Pipe
Growing Medium
Corrigated Metal Cistern
1'-6"
Concrete Edge
Washed Aggregate 4 1/2"
Compacted Subgrade
1'-0"
Growing Medium
9'-0"
Metal Flashing
PARTIAL INFILTRATION PLANTER
5
CISTERN
PROJECT N DATUM: SURVEY: HORIZ SCA VERT SCAL DESIGN: DRAWN: CHECKED: APPROVED DATE:
SHEET TITL
Waterproof Membrane Steel Decking Rain Chain
4
4"
26'-10"
1 1/2"
7'-0"
24'-10"
4 3/4"
Root Barrier
2"
Drainage Mat
6"
Filter Fabric
Native Soil
D
1'-0"
Steel Edge Washed Aggregate
10"
4'-0"
Washed Aggregate
NO.
1'-0"
Filter Fabric
7'-0"
6" Perforated Pipe
COU
7
GREEN ROOF
STORMWATER BMP DETAILS
67
Co
GRIFFIN design