Since then, an improved understanding of the flow regime (in particular, during both drought and flood conditions) has driven design changes. This study has shown that the properties upstream of Templemore belong to a separate flooding problem. These are now being treated as such under their own Small Works and the Local Authority will be put in funds to build their remedial works. The flood situation has been subjected to extensive hydrological analysis. This used the ten Hydrometric Years of data from OPW’s Hydrometric Station at Small’s Bridge (16136) to find its Index Flood. This also estimated the flood with just 1% Annual Probability of exceedence (the so-called ‘100-year’ event) as 16.2 m3/s. However, the biggest event that may be reliably estimated from data has a return period equal to twice the length of data; in the case of Station 16136 in Templemore, this is 20 years. As the Mall catchment is small, other Index Flood methodologies based on catchment characteristics are not appropriate; as these were developed based on larger catchments. As such, a Factorial Standard Error (FSE), at the customary 68% confidence limit (Cl), is being applied in order to give additional confidence in the estimation of the 100-year design flood, i.e. this helps to account for the reduced certainty due to having only ten years of Hydrometric Data. The final 100-year design flow estimate is 18.02 m3/s.