> For the complete documentation index, see [llms.txt](https://help.immodio.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.immodio.app/en/anleitung/einnahmen-und-ausgaben/buchhaltung-erweiterung/10095210-kosten-fuer-niederschlagswasser.md). # Costs for rainwater Help on the Immodio entry item Costs for precipitation water.
Use this category for running charges levied for draining rain and precipitation water from the property into the public sewer system. This includes in particular water running off roof surfaces, courtyards, driveways, parking spaces and other paved or sealed areas. In law, precipitation water charges are part of the **costs of drainage** and can in principle be recovered from the tenants as operating costs where the allocation of operating costs was effectively agreed in the rental agreement, which is of course the case in the **Immodio rental agreement**. #### What can be entered here? Enter here, for example: * the precipitation water charge shown separately in the charge notice, * rainwater or surface drainage charges, * running charges for discharging precipitation water into the public sewer system, * the running operating costs of a drainage pump, as far as it serves to drain precipitation water. What matters is that these are **regularly recurring costs for draining the property**. In addition to the public drainage charges, Section 2 no. 3 BetrKV also covers the costs of operating corresponding non-public systems and drainage pumps. #### How is the charge calculated? The precipitation water charge is normally not based on the residents' water consumption or on how much it actually rained in the year concerned. What matters are the **local charging statute** and the **areas of the property** from which rainwater reaches the sewer system. Depending on the municipality, the calculation is based, for example, on: * the built-up and paved area connected, * the sealed area of the property, * particular run-off factors for different surfaces, * the area of the property combined with an area run-off coefficient. {% hint style="info" %} The specific calculation differs from region to region. Hamburg calculates the charge on the basis of the sealed or built-over area connected, for example, while Munich combines the size of the plot with an area run-off coefficient. {% endhint %} #### When this category should not be used Do not use this category for: * fresh or drinking water costs, * consumption-based foul water charges, * general waste water charges, as far as they are calculated exclusively by water consumption, * repairs to waste water or rainwater pipes, * dealing with burst pipes or blockages resulting from a defect, * renewing sewers, pipes or pumps, * the purchase and construction of a cistern or infiltration system, * structural unsealing or redesign measures. {% hint style="info" %} Foul water charges belong in the category **"All costs for drainage, waste water outflow, waste water and maintenance, no repairs"**. Where a charge notice contains both foul water and precipitation water, the amounts shown should be recorded separately in the respective appropriate categories. {% endhint %} #### Assignment For the assignment select **"Property"** and then the property concerned. The precipitation water charge arises for the property as a whole and is therefore first assigned to the entire property. It is then allocated to the associated tenancies as part of the operating cost statement. Where no other effective allocation key was agreed, the costs in residential tenancies are generally allocated according to the share of the living space. #### Check the charge notice carefully Check in particular: * whether the notice concerns the right property, * which roof, yard, path and parking areas were taken into account, * whether the sealed or connected area stated is correct, * whether the partial areas actually drain into the sewer system, * whether unsealing or structural changes have already been taken into account, * whether foul water and precipitation water are shown separately, * which settlement period the charge relates to. Where the areas recorded do not match the actual position, the competent municipality or the drainage operator should be informed. #### Options for reducing the charge Depending on the local statute, the precipitation water charge can be reduced where rainwater no longer reaches the sewer system, or only partly does so. The following come into consideration, for example: * unsealing paved areas, * permeable paving, * infiltration troughs or soakaways, * green roofs, * cisterns or rainwater storage, Whether and by how much a reduction is possible always depends on the local rules. Structural measures should not be carried out solely because of a potential saving on charges. The local drainage statute, water law requirements, the nature of the ground and any permits needed have to be checked beforehand, among other things. **Info:** For the statement, keep in particular the following documents: * the charge or levy notice, * the municipality's list of areas, * details of the sealed and connected areas, * documents on reductions or exemptions, Tenants can ask to inspect the documents underlying the operating cost statement.