Environmental impact assessment 2010:   Comments to Campo Landfill DSEIS. The siting of the proposed Campo landfill: (a) on top of a fractured rock aquifer of uncertain characterization, (b) on the headwaters of Lower Campo Creek, (c) within close reach of the groundwater, and (d) in a region subject to strong earthquakes, poses a high risk of contamination of groundwater, of difficult and costly mitigation.

Environmental impact analysis 2009:   Environmental impact assessment of the La Leche river flood control project, Lambayeque, Peru. The Leopold matrix and Battelle Environmental Evaluation System methodologies are used to develop the EIA for two proposed dams (La Calzada and Calicantro) in the La Leche river valley.

Flood hydrology 2009:   Cascade and convolution. The methods of cascade of linear reservoirs and unit hydrograph convolution are shown to be one and the same when the cascade parameters are used to calculate the unit hydrograph of the convolution.

Flood hydrology 2008:   Flood hydrology of the La Leche river flood control project, Lambayeque, Peru. The flood hydrology of the La Leche river flood control project is evaluated using mathematical modeling. The RAINFLO model is used to calculate flood hydrographs for the design of principal spillway, emergency spillway, and freeboard.

Water quality 2008:   Online DO sag analysis. Minimum dissolved oxygen concentration and its location along a given stream, in response to an input effluent biochemical oxygen demand and a ratio of effluent discharge to stream discharge.

Sustainability of agriculture 2008:   Hydrological and environmental impact of the irrigations of La Joya and San Isidro-La Cano on the Vitor valley, Arequipa, Peru. Assessment of impacts of irrigation development on the surrounding environment. Increased salinity and slope instability are documented.

River mechanics 2008:   The Lane relation revisited. A dimensionless formulation of the Lane relation of fluvial hydraulics. The new criteria enables improved assessment of aggradation and degradation.

Sediment transport 2008:   Total sediment discharge by the Modified Einstein Procedure. Online calculation of Modified Einstein Procedure (1955). This online script will accept sediment data input and calculate total sediment load, including measured and unmeasured load, and bed material and wash load.

Groundwater hydrology 2007:   Sustainable yield of ground water. Assessment of groundwater potential from a hydrologic perspective. Criteria is developed to determine sustainable yield as a fraction of mean annual recharge.

Ecohydrology /Groundwater hydraulics 2006:   Impact of the proposed Campo landfill on the hydrology of the Tierra del Sol watershed, San Diego, California. Assessment of the impact of a proposed landfill on the hydrology of a small semiarid watershed.