The reference regulations is the Legislative decree
dating back to April 3, 2006 n. 152, “Single
text on waters” including the
“Environmental regulations” published on
the Official Gazette. n. 88 dating back to
14/04/2006.
As for rain waters, the Legislative decree 152/06,
art. 113 “Rainfall water and washing water for
exteriors” supplements what follows:
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As to prevent hydraulic and environmental risks,
regions, after consulting the Ministry of the
Environment and protection of the territory,
govern any control on the run-off rain water
discharges coming from separated sewages and cases
which run-off rain water releases, through
separated pipes, should undergo specific
prescriptions, if not a possible authorisation.
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Regions govern cases where it can be required that
rainfall and washing waters of any exterior are
conveyed and duly treated in purging installations
under specific conditions according to the
enforced activities, where there is the run-off
risk, from waterproof surfaces, of dangerous
substances or substances affecting and
compromising the water body quality goals.
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It is forbidden to release rain waters in
groundwater.
The first regulation directly facing the issue is the
Regional Law passed in Lombardy on May 27, 1985, n. 62
relating to the “civil settlement of public
sewages and protection of underground water from
pollution” where for the first time,
“rainfall waters” are defined.
The regulations at present in force in the Region of
Lombardy is the R.R. dating back to March 24, 2006, n.
4, governing the rainfall water disposal and run-off
waters from exteriors, enforcing article 52, paragraph
1, letter a) of the Regional law, dating back to
December 12, 2003 n. 26.
The regulation defines the “waters even from one
or two rainfalls, temporarily separated as well by at
least 96 hours from a similar event and defines
rainfall waters, corresponding in the first part of
the rain event, to a 5 mm rainfall, uniformly
distributed on the entire draining surfaces, supported
by the rain water collection network.
As to define capacities, the inflow coefficient
account for 1 for waterproof surfaces.
In general terms, separation, interception and
treatment of a consistent part of rain water coming
from the flooring run-off under pollution risks, are
defined as rainfall waters. Such water includes the
highest loaded-polluted volume and therefore it is to
be collected in suitable tanks and suitably treated
before being moved to the allocated receptor.
The regions which already approved specific
regulations are hereinafter reported:
- REGION OF LIGURIA: R.R. July 10, 2009 N. 4.
-
REGION OF VALLE D'AOSTA: L.R. 24-08-1982 N.
59.
- REGION OF PIEMONTE: D.P.G.R. 13/R 4-12-2006
-
REGION OF VENETO: D.G.R. n. 2884 dating back to
September 29, 2009
-
REGION OF FRIULI VENEZIA GIULIA: L.R. N. 16 dating
back to 05-12-2008
-
REGION OF EMILIA ROMAGNA: Resolution n. 2184
27-12-2007
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REGION OF TOSCANA: L.R. 28/2010 changing the
regional regulation n. 20/2006
-
REGION OF MARCHE: Resolution 07.02.2005 n. 157
- REGION OF UMBRIA: DGR July 9, 2007, n. 1171
- REGION OF ABRUZZO: L.R. 17/08
- REGION OF LAZIO: D.C.R. 27/09/07, n. 42
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REGION OF CAMPANIA: D.C.R. 6/07/2007, n. 1220
- REGION OF APULIA: D.C.E.A. n. 282 21/11/03
- REGION OF BASILICATA: L.R. 17/01/94, n. 3
- REGION OF CALABRIA: L.R. 03/10/97 N. 10
- REGION OF SARDINIA: L.R. N. 34 21-02-1997
- REGION OF SICILY: L.R. 27/86