Flow duration at streamflow gaging stations in Puerto Rico

Abstract

Flow-duration tables were computed for 78 streamflow continuously gaging stations in Puerto Rico. Mean-daily discharges were used to compute the duration frequencies for the historical period of record of the stations as well as for individual months. The period of record at the gaged sites ranged from 3 to 25 years. 3 3 55 ft /s during the dry season (April curve), and 170 ft /s during the wet season (October curve).

PREDICTION OF MASTER RECESSION CURVES AND BASEFLOW RECESSIONS IN THE LUQUILLO MOUNTAINS OF PUERTO RICO1

“…These recession events started at or below the average Q 90 flow duration (Quiñones et al, 1984) and lasted for less than ten days. These recession events started at or below the average Q 90 flow duration (Quiñones et al, 1984) and lasted for less than ten days.…”

“…In order to evaluate the relative performance of each method, a new set of observed recessions were selected. These recession events started at or below the average Q 90 flow duration (Quiñones et al, 1984) and lasted for less than ten days. The baseflow recession constant calculated from each method was used to predict the observed recessions given its initial value (Q o ).…”

“…This type of recession behavior is very common in both of the watersheds included in this study, suggesting that streamflow recessions cannot be fully explained by a simple exponential decay function. Quiñones et al (1984). c Calculated values using the recession constant (k) from the three methods with the lowest RMSE (Table 2).…”

“…b Average Q 90 and Q 99 values for Río Espíritu Santo (Station 638) and Río Fajardo (Station 710) were calculated from monthly flow duration b tables inQuiñones et al (1984). The method in bold had the lowest RMSE for each case.…”