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The problem of stormwater management
Road floods
During sudden and violent storms high downpour rates overcome the capacity of installed drains and sewer systems.The consequence are road floods that paralyze trafic and causes huge damage in city centers.
Building floods
Water that storm sewers are unable to manage will flood the lower levels of building causing:
• damage to structures and property• sinking of the foundation• loss of building value• interruption of public services
Damage to people and to the environment
Floods in inhabited areas cause disruption and physical risk for the population.
Uncontrolled runoff and infiltration of large amounts of water cause washouts and landslips.
The solution is…
Store and soak away excess stormwater in safe and invisible underground basins
H2O Water management
Stormwater management is important.
• INFILTRATE STORMWATER and replenish the acquifer
• Temporary STORE STORMWATER
• ELEVETOR TANK: store stormwater for reuse
Formwork1 has product for each of theserequirements.
DRENING: water infiltration
DRENING is an underground stormwater storage and infiltration system.
47.2’’
15.7’’
31.4’’
25.5’’
15.7’’
DRENING: water infiltration
DRENING brings back the infiltration to the watertable close to the natural hydrologic function, significantly reducing runoff.
Approx 50% infiltration
30% evapotranspiration
approx. 20% runoff
Temporary water storage
DRENING basins temporary store stormwater, buffering flood peaks.This is extremely important in urban areas where the surface is highlyimpervious, with great risk of flood during storms.
Urban area, no DRENING Water flow
t
Urban area, with DRENING
DRENING: water infiltration
Typical layer structure of a stormwater infiltration system made with
DRENING
Paved surface
Road subgrade
Geotextile
Heavy gravel
water inlet
Natural soil
DRENING H40
PVC tube
ground infiltration11.8’’ 31.5’’
15.7’’
5.9’’
23.2’’
DRENING: water infiltration
Advantages of underground stormwater infiltration
system made using DRENING:
• As the DRENING system has a high load-bearing capacity, the overlaying area is available for use as road, parking lot or other activities involving the use of heavy vehicles and/or equipment.
• No water infiltration pools or channels are exposed to the elements, eliminating risk to the public as well as possible smell and insects.
• Local infiltration avoids overtaxing of the public sewer or river system, acting as a buffer and thus helping to prevent flooding.
• Infiltration is a recognised method for filtration of pollutants from road- and road run-off water.
• Local infiltration with DRENING brings back a developed area to its natural water balance. Stormwater is returned to the watertable locally rather than being routed to the sea, replenishing a precious natural resource.
DRENING: water infiltration
High load-bearing capacity and light weight make
DRENING easy effective and cheap to install.
Temporary water storage
Temporary storage is complementary to infiltration, buffering flood peaks.
DRENING stores 310 liters/sq.mt. The surrounding gravel will also store water, increasing the total storage capacity.
SOIL TYPE PermeabilityVi = (m/s)
Clay 10-9
Clay loam 10-8 / 10-7
Silt 10-6
Fine sand 10-5
Heavy sand 10-4
Fissured rock 10-3
The temporary storage capacity needs to be adapted to theexisting soil conditions, which heavily influence infiltration speed.
End-caps
Man hole
Water influx47.2’’
31.5’’
7.2
’’
39.7’’
Stormwater management
DRENING
fast basin calculator
available online inwww.geoplast.it
DRENING: water infiltration
Alessandria, Italy - 516,000 sq.yds
DRENING was installed at a depth of 9.5 ft, thus with a backfill of 8.2 ft above the system. The high compression resistence of the product
made it possible to install the basin quickly and cost effectively.
DRENING: water infiltration
Reggiolo, Italy - 6,400 sq.yds
DRENING was installed in a diamond-shaped area following the shape of the carpark and avoid the creation of voids in the immediate proximity to the supermarket building.
DRENING: water infiltration
Reggiolo, Italy - 6,400 sq.yds
DRENING was installed in a diamond-shaped area following the shape of the carpark to avoid the creation of voids in the immediate proximity of the supermarket building.
DRENING: water infiltration
Padova, Italy - 8,800 sq.yds
All the stormwater collected from the impervious surfaces of this project (building and loading area) is collected in the SUDS basin created under the loading area. The high compression resistance of Drening, complemented by
a slab of R.C. reinforced with two welded meshes, make it possible to store goods and allow the transit of HGVs.
DRENING: water infiltration
DRENING: water infiltration
DRENING: water infiltration
Stormwater storage
Elevetor Tank : the solution for large and compact stormwater storage tanks
• In situ cast reinforced concrete stormwater storage and attenuation tanks
• Custom shape and size cisterns
• Tank depth up to 8.2 ft
• Creates a high load-bearing capacity structure
Stormwater storage
Elevetor Tank the solution for large and compact stormwater storage tanks
Stormwater storage
Concrete water tank built using the ELEVETOR TANK system
Stormwater storage
The cistern formed with ELEVETOR TANK is easy to inspect thanks to an inspection well allowing the access into the tank
Stormwater storage
Advantages of the ELEVETOR system:
• Built on-site - No crane or other heavy lifting equipment is required to lift precast elements.
• Extremely high load-capacity – achieves over 14.2 lb/sqft.
• Up to 8.2 ft height, – can be adapted to any situation.
• Any reservoir shape is possible – extreme flexibility.
• Up to 7.43 cuft/sqft water storage capacity.
Tank depth: 6.6 ft
Tank surface: 600 sqyd
Tank capacity: 35,310 cuft
Load type: Cat. 1 (17,600 lb/wheel)
Location: Italy
Stormwater storage