Average Annual Flow

Definition

The arithmetic mean of daily flow is calculated individually for each water year. This metric is in units of cfs.

Steps

1. Convert raw date and flow data columns into a flow matrix based on water year. Each column starts with the beginning of the water year (i.e. 10/1) and ends with the end of the water year (i.e.9/30).

2. Calculate the average annual flow for each water year:

   average_annual_flows.append(np.nanmean(flow_matrix[:, index]))