# Adding a Demand
In this section an output node representing a municipal demand will be added to the system which will draw water from the reservoir.
## Adding an output node
Add an **output** node to the system which will represent an urban demand that wil abstract water from the reservoir. Rename the node to 'Example demand'.
Adding an output node as a demand
## Baseline demand
In the **Baseline** scenario set the following attributes on the **Example demand** node:
Baseline scenario
* **max\_flow** = 0. This represents a deamnd of 0 Mm3/day.
* **allocation\_penalty** = -1000. This represents a high priority for water allocation
The attributes defined on the Example demand node
## **Create a new scenariao**
**Create a new scenario called 'With demand'.** For a reminder on how to create a scenario please follow the link below.
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## Demand in the new scenario
In the **'With demand'** scenario, set the **max\_flow** of the Example demand to 0.1 Mm3/day and run this scenario .
Example demand
## View and compare the reservoir volume
View the **simulated\_volume** of the reservoir in this scenario and compare against the baseline.
Selecting baseline to compare
Reservoir volume comparison
## Exercises and questions
In this case, we are modelling the 'live' storage of the reservoir. When the reservoir goes to 0 storage in the model there is still dead storage in the system. At the dead storage level, the remaining water isn't able to be released.
* **How high can the demand go before the reservoir empties to its dead storage?**
*To do this, create a new scenario and change the max\_flow of the demand node and rerun the model multiple times until the reservoir reaches 0 storage.*
* **What is the maximum monthly spill from the reservoir in the simulation?**
*Hint: Look at the simulated\_flow on the spill link node.*
* **Create a 'Monthly demand' scenario. Use the following video to help you implement a monthly profile demand, where the Example demand changes based on the months:**
Jan-Mar: 0.1 Mm3/day
April-June: 0.06 Mm3/day
July-Sept: 0.07 Mm3/day
Sept-Dec: 0.09 MM3/day
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