Prospects and Limitations of Surface Runoff Quality Management in the Republic of Serbia - page 06

 

The Republic of Slovenia

In the Republic of Slovenia, a Decree on Emission of Pollution from Public Roads (Official Gazette of the Republic of Slovenia, no. 47, 13.05.2005) states that surface runoff from public roads should be collected and treated to achieve discharge water quality parameters in accordance with Table 4. Treatment should be provided for a design storm with a duration of 15 minutes and an intensity of 15 l/s/ha. Regulation is related to the drainage of public roads and is not directly applicable to urban watersheds.

 

Table 4: Minimal quality of runoff from public roads that is discharged into watercourses or public sewer systems (Official Gazette of the Republic of Slovenia, No. 47, 13.05.2005)

Parameter

units

Limit values

for discharge into watersourses

for discharge into public sewers

General parameters

Suspended solids

mg/l

80/160 (a)

(b)

Settleable solids

ml/l

0.5/10 (b)

10

Inorganic parameters

Cd

mgCd/l

0.1

0.1

Cu

mgCu/l

0.5

0.5

Zn

mgZn/l

2.0

2.0

Total Cr

mgCr/l

0.5

0.5

Ni

mgNi/l

0.5

0.5

Organic parameters

Mineral oils

mg/l

10/50 (a)

20

BTX (c)

mg/l

0.1

1.0

AOX

mgCl/l

0.5

0.5

Phenols

mg (C6H5OH)/l

0.1

10

PAH

mg/l

0.0006

-

(a) Lower value is applied when required by the water management regulations

(b) Limit concentration of substances in the rain water is determined by the environmental permit, with the value at which there is still no impact on the sewers of wastewater treatment plant

(c) The sum of concentrations of benzene, toluene and xylene

 

 

The Russian Federation

In the Russian Federation, the City of Moscow regulation defines that the first surface runoff from rain and snowmelt from the urban parts of the city shall be collected and treated before discharge. Design flow for treatment devices is defined by the runoff from rain with a duration of 20 minutes that occurs ten times a year, which amounts to a rain intensity from 10 to 12 litres per second per hectare.

Republic of Serbia

In the Republic of Serbia, practical experiences in stormwater runoff management are very limited. Low Impact Development (LID) principles are still not implemented which leads to additional stresses on the existing downstream sewer systems and watercourses. Monitoring of precipitation and water quality needs to be expanded to meet requirements of stormwater management. In some cases of new road construction, facilities for stormwater retention and treatment are required, but the design criteria for these facilities are not complete.

Legislation regarding water management is being harmonised with the EU regulation, which in the long run should provide an appropriate framework for integrated water management, including stormwater runoff management and diffuse pollution sources control. It is necessary to develop regulations defining the required design parameters, criteria, runoff quality and quantity monitoring systems. Regulations should include policies and guidelines for the design and operation of the stormwater runoff control and management, taking into account the experiences of countries that implement runoff control measures, as well as current local socio-economic conditions.

In new or planned settlements, it is possible to use a full set of stormwater runoff management measures. New settlements should be planned and developed in a way that ensures the management of runoff by applying the LID principles. This includes the application of systems for stormwater retention, infiltration and reuse, while only surpluses may be released into the environment under conditions that will not endanger the receiving waters.

In existing settlements, the possibilities of applying measures to control runoff are limited by the existing urbanisation and infrastructure. Therefore, solutions must be adapted to specific conditions and realistic stormwater runoff control goals. Planning and implementation of such systems into already urbanised areas must include public participation in defining/establishing the community's stormwater management needs and corresponding goals.