.png){kind=small}
Hydro Resource Evaluation Tool
physical characteristics of a hydro site
Tier 1. Transposing measured data to estimate mean flow
Introduction
The aim of this section is to see if there is any measured flow data you can use to estimate your mean flow. If measured flow data exists you may be able to transpose the gauged (or analogue) flow data to your proposed schemes catchment, where you have no measured flow.
Generally, to use data from nearby gauging stations you need to ensure that it receives a similar amount of rainfall (climatic conditions) and has similar geology and soils (hydrogeology) so that the catchment responds to the rainfall in a similar way. Considering proximity is usually a good position to start from.
The estimation of river flow for ungauged sites by transposing gauged river flow data from an analogue catchment is a widely used technique requiring the re-scaling of the flow regime to the ungauged target catchment. If there is a short period of measured flow data at the proposed scheme, you can build these data into the transposition methods through the use of regression based relationships between the flows for the target and the analogue catchments (e.g. Shaw, 1988). Please click here (link 1.4.3) for details of transposing flows to short gauged flow records.
In this section you will find information on the following:
