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

H 2 O Water management Stormwater management is important. INFILTRATE STORMWATER and replenish the acquiferINFILTRATE STORMWATER Temporary STORE STORMWATERSTORE STORMWATER ELEVETOR TANK: store stormwater for reuseELEVETOR TANK Formwork1 has product for each of these requirements.

DRENING : water infiltration DRENING is an underground stormwater storage and infiltration system

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 highly impervious, 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 infiltration

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 TYPEPermeability V i = (m/s) Clay10 -9 Clay loam10 -8 / Silt10 -6 Fine sand10 -5 Heavy sand10 -4 Fissured rock10 -3 The temporary storage capacity needs to be adapted to the existing soil conditions, which heavily influence infiltration speed. End-caps Man hole Water influx

Stormwater management DRENING fast basin calculator available online in

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

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