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- Created by Abraham Toribio, last modified on Sep 18, 2017

**The Rainwater Tank option allows flow** to be captured with a predefined Harvesting Demand and removed from ** Inflows** (** Catchment Area**, ** Green Roof**, ** Roof** and/or Input ** Hydrograph**).

Tick the **Use Rainwater Tank** option to activate the variables and specify rainwater tank details.

**Rainwater Tank: Specifications**

** **

* Number of Tanks *- The Rainwater Tank can represent a single tank or the combined volume of a number of tanks.

The **Rainwater Tank** is considered as two distinct parts:

- Retention part which supplies the Harvesting Demand.
- Detention part which can be used to provide additional storage for stormwater control.

If **Retention Used** is ticked the volume of the Retention part is used to supply the Harvesting Demand. If un-ticked inflow passes only into the Detention part, any further inflow passes downstream.

**Volume**** **- Enter the volume available in the **Retention** part of the tank. This volume is multiplied by the Number of Tanks value. The volume can be calculated using the ** Volume Calculator**.

* Initial Percentage Used* - Enter the percentage of the Retention part of the tank used at the beginning of Analysis.

* Initial Volume Used* - Shows the volume of the Retention part of the tank used at the beginning of Analysis.

* Harvesting Demand* - Enter the Harvesting Demand flow rate. This volume is multiplied by the Number of Tanks value.

If **Detention Used **is ticked the volume of the Detention part is used to to capture the inflow and outflow to pass downstream. If un-ticked inflow passes directly into the Retention part and any further inflow passes downstream.

**Volume**** **- Enter the volume available in the **Detention** part of the tank. This volume is multiplied by the Number of Tanks value. The volume can be calculated using the ** Volume Calculator**.

* Initial Percentage Used* - Enter the percentage of the Retention part of the tank used at the beginning of Analysis.

* Initial Volume Used* - Shows the volume of the Retention part of the tank used at the beginning of Analysis.

* Outflow Limit* - Enter the maximum Outflow rate possible. This volume is multiplied by the Number of Tanks value.

**See Also**

**Workflow - What's next...?**

**Inflows** connect to either **Junctions** or **Stormwater controls** via **Inlets**. Specify an** Outlet** on these objects then choose to connect to another Junction or Stormwater Control.