Graph 1:
Graph 2:
Solutions for changing the contract price in the countries described
| Country | Guidelines or measure | Valid from |
| Slovenia | Explanation of the permissible changes to contracts due to the increase in prices of materials and services | November 2021 |
| Croatia | Guidelines for the implementation of procedures for the recogni- tion of price differences on the basis of construction contracts | February 2022 and April 2022 |
| Serbia | Decision of the City of Belgrade | June 2022 |
| Decision of Ministry of Construction, Transport and Infrastructure | In preparation | |
| Monte Negro | Methodology for determining price differences in construction services | September 2022 |
| Germany/Bavarian government | Application of a sliding scale | No information |
| Italy | Unconditional payment of price difference for all contracts | No information |
Basic characteristics of channels
| Channel | Pipeline diameter (mm) | Projected pipeline drop i = [%] | Length L = [m] |
|---|---|---|---|
| C1 | DN 200 | 10.5–94.8 | 267.54 |
| C2 | DN 200 | 4.00 | 146.74 |
Calculated new contract price according to the GZS-ZGIGM method
| Channel | Base contract price (CPs) March 2021 | Index GZS-ZGIGM | New contract price (CPc) March 2022 | |
|---|---|---|---|---|
| C1 | 40,802,91 € | 117.36 | 47,886,30 € | |
| C2 | 40,002,27 € | 117.36 | 46,946,66 € |
Calculated indices of recognised price increases according to the calculation method
| Channel | Base contract price (CPs) March 2021 | New contract price (CPc) | March 2022 | Index |
|---|---|---|---|---|
| C1 | 40,802,91 € | 45,681,93 € | 111.96 | |
| C2 | 40,002,27 € | 50907,78 € | 127.26 |
Calculated indices of recognised price increases using the hybrid method
| Channel | Base contract price (CPs) March 2021 | New contract price (CPc) March 2022 | Index | |
|---|---|---|---|---|
| C1 | 40,802,91 € | 46,298,56 € | 113.47 | |
| C2 | 40,002,27 € | 49,781,79 € | 124.45 |