Related Experiment Video
Updated: Jul 19, 2026
10:35
A Protocol for Conducting Rainfall Simulation to Study Soil Runoff
Published on: April 3, 2014
Using simulated rainfall to evaluate field and indoor surface runoff phosphorus relationships
A R Guidry1, F V Schindler, D R German
1East Dakota Water Development District, 132 B Airport Drive, Brookings, SD 57006, USA.
Journal of Environmental Quality
|October 31, 2006
Summary
Indoor rainfall simulations can effectively predict phosphorus (P) concentrations in agricultural field runoff. This study validates indoor simulation methods for estimating total dissolved P in surface water, aiding water quality management.
Area of Science:
- Agricultural Science
- Environmental Science
- Soil Science
Background:
- Predicting phosphorus (P) in surface runoff is crucial for agricultural water quality management.
- Outdoor rainfall simulations are common, but indoor simulations for predicting P concentrations in runoff are less studied.
- Understanding P runoff from agricultural fields is vital for mitigating non-point source pollution.
Purpose of the Study:
- To evaluate the efficacy of indoor rainfall simulation in predicting total dissolved phosphorus [TP(<0.45)] concentrations in surface runoff.
- To compare runoff characteristics and P concentrations from indoor packed soil boxes versus outdoor field plots.
- To establish a predictive relationship between indoor and outdoor simulation results for agricultural soils.
Main Methods:
- Utilized indoor rainfall simulation on packed soil boxes and outdoor simulation on residue-free field plots.
- Applied rainfall at 65 mm h⁻¹ for 30 minutes to generate surface runoff.
- Analyzed total dissolved phosphorus [TP(<0.45)] concentrations and losses in collected runoff from four dominant South Dakota agricultural soils.
Main Results:
- Packed soil boxes generated approximately 24% more runoff than field plots.
- No significant statistical differences in TP(<0.45) concentration or loss were found between packed boxes and field plots across all soil series.
- A strong predictive relationship (0.68 < r² < 0.94) was established for TP(<0.45) concentration in field runoff using data from packed boxes.
- Three out of four soils showed significantly higher total P loss from packed boxes compared to field plots.
Conclusions:
- Indoor rainfall simulation is a viable method for predicting total dissolved phosphorus [TP(<0.45)] concentrations in agricultural field runoff.
- The developed predictive model demonstrates the capacity of indoor simulations to adequately estimate field runoff P concentrations for specific soils.
- This research supports the use of controlled indoor rainfall simulations as a reliable tool in water quality assessment for agricultural landscapes.
Related Concept Videos
01:21The Phosphorus Cycle
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
01:30Typical Model Studies
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.