Ladies and Gentlemen, we have launched the sale of the first workshop that will take place during Stormwater.

Workshop: Issuing and veryfying technical requirements for rainwater is dedicated for the employees of waterworks companies or municipal departments responsible for the process of issuing technical requirements for connection or rainwater discharge into a receiver. Aim of the workshop is to get acquainted with modern tools aiding determination of technical requirements for connection to stormwater drainage system.


Numerous investments, which are deemed favourable from the point of view of urban and surrounding areas development that translate into residential development, more jobs in large-format stores, new retail and service centres and recreational areas development are a real challenge for the entities and individuals responsible for the operation of dewatering systems. Working at the upper limit of performance, dewatering systems cannot receive extra stormwater runoff from new soil sealed surfaces. Despite this, there is a great pressure put on the operator to agree to connect the new, local dewatering systems for newly developed areas to the already existing dewatering system. This is a particularly difficult moment for the operator, but also an opportunity to make the investor bear the costs of lost retention on these areas and to stop the excess of maximum stormwater runoffs.

–  How to calculate maximum runoff and what parameters to take?

– What tools need to be used in order to facilitate every day’s work in determining technical requirements for a particular connection?

– What are they used for and how do runoff regulators work? How to select the appropriate one?

– The standards of determination of technical requirements for a connection – what are they? What procedures need to be implemented in a waterworks company?

– Requirements for large investments. How to approach this issue? Practical examples.

– Do we feel safe issuing technical requirements? Applications: calculators based on PANDa atlas, GIShub and Rainbrain; can they help us?

– Examples, experiences, questions to the practitioners.


At the beginning of the workshop we would like to show a practical way of calculating maximum permissible stormwater runoff from areas to be developed. By means of practical exercised we want to prove that what is often a subjective or “expert” estimation of stormwater reception, on the accuracy level of single liters or tens of liters per second, can be supported with objective and unquestionable calculations. We also want to draw your attention to the need of organising and codifying the rules of adopting relevant parameters such as runoff coefficient, surface runoff time and categories of area use. Such methodology will be a real shield for the operator in cases of undermining stormwater reception assurance.


We do not want to focus only on the phase of issuing technical requirements. We believe practical approach is about having relevant knowledge and tools in order to appropriately verify these requirements. That is why we would like to present the calculation method of retention basin capacity sufficient for stormwater retention and infiltration. We would like to draw your attention to the practice of underestimating the necessary retention capacities done by investors by manipulating with runoff coefficients, runoff time, watershed categories and the local precipitation model. As participants, you will be able to verify necessary retention capacity for particular developments using electronic calculators based on actual and reliable precipitation models featured in PANDa atlas (Polish Atlas of Rainfall Intensities).


The third part of the workshop will focus on demonstrating technical solutions used to provide effective methods of throttling stormwater runoff from private plots flowing into a collective dewatering system. Various types of hydraulic regulators will be presented in this section together with design requirements that must be met for the correct operation of the whole system. Here we will also focus on the reprehensible practice of their deinstallation once the final inspection of the investment is carried out. New IT systems for remote programming of stormwater outflow from retention basins will also be presented (outflow reduction and its time delay).


The fourth part will focus on particular examples of issuing technical requirements for large-format facilities. Here you will be acquainted with dedicated computed simulations followed up be correct interpretation of the results.


At the end of the workshop we would like to focus on long-term benefits stemming from the appropriate method of preparing technical requirements. By using a user-friendly and easily accessible internet tool such as GISHub application we would like to show you how you can manage information about the terrain in order to calculate the actual charge for draining stormwater from the area.


The workshop will be conducted by engineers with years of experience in calculating and modelling drainage systems, who have prepared a complete methodology for issuing technical requirements in large cities across Poland. Practitioners, such as operators, who have already implemented or are currently implementing these standards of issuing and verifying technical requirements for stormwater drainage from cities of various sizes will also take part in the workshop. The issue of runoff throttling will be discussed by a designer and an experienced researcher into hydraulic regulators.


We cordially invite you to participate in this workshop. It will not be an unproductive time. On the contrary, it is time to actively shape retention around us following the motto: One may not catch all the rain in one pipe!




If you are interested in participating in “Stormwater Poland in 2020” conference we encourage you to register:

Conference cost is 1490 zl + 23% VAT  and 390 zl + 23% VAT workshops

Cost of participation:


Please contact with us:

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ul. Marynarki Polskiej 163

80-868 Gdańsk

NIP: 584-274-32-99

phone: +48 605 721 555

Katarzyna Grochowska

Event Manager