Estimates of low and high flows are often required for the design of various civil engineering works. For example, low flow estimates are required for water supply intake design, hydropower studies, and instream flow requirements; and high flow estimates are required for spillway designs, culvert designs, and general flood control works.
Data are seldom available where flow estimates are required and hence estimates for sites where there is insufficient or no data has to be estimated from sites with data.
Pooling data from various sites to obtain flow estimates require the use of various statistical methods. Methods used include methods of regression analysis, L-Moments, and various multivariate techniques.
Our various studies have shown that improved flow estimates can be achieved by properly dividing the Island into homogeneous regions and using unbiased methods for statistical parameter estimation.
As data become available, updates of the regional estimation methods must be made and new approaches tried. So it is an on-going process.
No commercial product is anticipated, but anyone needing help with regional low or high flow analysis can contact the principal investigator for assistance.