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