The effect of man-made instream storage on the naturally variable rate of streamflow must be considered in the assessment of surface water availability for any major use such as municipal water supply and hydro power generation.

When site specific streamflow data are not available, storage-yield curves determined at one or more nearby gauging stations may have to be used.

This guide presents the updated non-dimensional storage-yield curves for 66 gauged watersheds.

A spreadsheet was developed to allow a user to select specific gauged watersheds for use as predictors for determining storage-yield curves at ungauged sites. This guide describes the spreadsheet and provides some guidelines on the selection of gauged watersheds. The spreadsheet included in this guide can be used to provide a preliminary estimate of storage requirement for a desired yield at an ungauged site.

• A Guide to Storage Yield Analysis at Ungauged River Sites (1.5 MB)
• Excel Spreadsheet – Required Min Storage

Adobe® Acrobat® Reader software can be used for viewing PDF documents. Download Acrobat® Reader for free.