Modeling Nitrate at Domestic and Public-Supply Well Depths in the Central Valley, California

2014 ◽  
Vol 48 (10) ◽  
pp. 5643-5651 ◽  
Author(s):  
Bernard T. Nolan ◽  
JoAnn M. Gronberg ◽  
Claudia C. Faunt ◽  
Sandra M. Eberts ◽  
Ken Belitz
Keyword(s):  
Central Valley ◽  
Public Supply

scholarly journals Assessing the Vulnerability of Public-Supply Wells to Contamination: Central Valley Aquifer System near Modesto, California

Fact Sheet ◽  
2009 ◽  
Author(s):  
Martha L. Jagucki ◽  
Bryant C. Jurgens ◽  
Karen R. Burow ◽  
Sandra M. Eberts
Keyword(s):  
Central Valley ◽  
Aquifer System ◽  
Public Supply

Hydrogeological responses in tropical mountainous springs

2019 ◽  
Author(s):  
Ricardo Sánchez-Murillo
Keyword(s):  
Costa Rica ◽  
Isotope Composition ◽  
Central Valley ◽  
Distribution Functions ◽  
Geochemical Composition ◽  
Transit Times ◽  
Management Plans ◽  
Best Fit ◽  
Term Data

This study presents a hydrogeochemical analysis of spring responses (2013-2017) in the tropical mountainous region of the Central Valley of Costa Rica. The isotopic distribution of δ18O and δ2H in rainfall resulted in a highly significant meteoric water line: δ2H = 7.93×δ18O + 10.37 (r2=0.97). Rainfall isotope composition exhibited a strong dependent seasonality. The isotopic variation (δ18O) of two springs within the Barva aquifer was simulated using the FlowPC program to determine mean transit times (MTTs). Exponential-piston and dispersion distribution functions provided the best-fit to the observed isotopic composition at Flores and Sacramento springs, respectively. MTTs corresponded to 1.23±0.03 (Sacramento) and 1.42±0.04 (Flores) years. The greater MTT was represented by a homogeneous geochemical composition at Flores, whereas the smaller MTT at Sacramento is reflected in a more variable geochemical response. The results may be used to enhance modelling efforts in central Costa Rica, whereby scarcity of long-term data limits water resources management plans.

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