# Channel Water Balance Water storage in the reach at the end of the time step is calculated: $$V\_{stored,2}=V\_{stored,1}+V\_{in}-V\_{out}-tloss-E\_{ch}+div+V\_{bnk}$$ 7:1.8.1 where $$V\_{stored,2}$$ is the volume of water in the reach at the end of the time step (m$$^3$$ H$$*2$$O), $$V*{stored,1}$$ is the volume of water in the reach at the beginning of the time step (m$$^3$$ H$$*2$$O), $$V*{in}$$ is the volume of water flowing into the reach during the time step (m$$^3$$ H$$*2$$O), $$V*{out}$$ is the volume of water flowing out of the reach during the time step (m$$^3$$ H$$\_2$$O), $$tloss$$ is the volume of water lost from the reach via transmission through the bed (m$$^3$$ H$$*2$$O),$$E*{ch}$$ is the evaporation from the reach for the day (m$$^3$$ H$$\_2$$O), $$div$$ is the volume of water added or removed from the reach for the day through diversions (m$$^3$$ H$$*2$$O), and $$V*{bnk}$$ is the volume of water added to the reach via return flow from bank storage (m$$^3$$ H$$\_2$$O). SWAT+ treats the volume of outflow calculated with equation 7:1.3.11 or 7:1.4.7 as the net amount of water removed from the reach. As transmission losses, evaporation and other water losses for the reach segment are calculated, the amount of outflow to the next reach segment is reduced by the amount of the loss. When outflow and all losses are summed, the total amount will equal the value obtained from 7:1.3.11 or 7:1.4.7. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://swatplus.gitbook.io/io-docs/theoretical-documentation/section-7-main-channel-processes/water-routing/channel-water-balance.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.