RRAWFLOW: Rainfall-Response Aquifer and Watershed Flow Model (v1.15)

Geoscientific Model Development



The Rainfall-Response Aquifer and Watershed Flow Model (RRAWFLOW) is a lumped-parameter model that simulates streamflow, spring flow, groundwater level, or solute transport for a measurement point in response to a system input of precipitation, recharge, or solute injection. I introduce the first version of RRAWFLOW available for download and public use and describe additional options. The open-source code is written in the R language and is available at http://sd.water.usgs.gov/projects/RRAWFLOW/RRAWFLOW.html along with an example model of streamflow. RRAWFLOW includes a time-series process to estimate recharge from precipitation and simulates the response to recharge by convolution, i.e., the unit-hydrograph approach. Gamma functions are used for estimation of parametric impulse-response functions (IRFs); a combination of two gamma functions results in a double-peaked IRF. A spline fit to a set of control points is introduced as a new method for estimation of nonparametric IRFs. Several options are included to simulate time-variant systems. For many applications, lumped models simulate the system response with equal accuracy to that of distributed models, but moreover, the ease of model construction and calibration of lumped models makes them a good choice for many applications (e.g., estimating missing periods in a hydrologic record). RRAWFLOW provides professional hydrologists and students with an accessible and versatile tool for lumped-parameter modeling.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title RRAWFLOW: Rainfall-Response Aquifer and Watershed Flow Model (v1.15)
Series title Geoscientific Model Development
DOI 10.5194/gmd-8-865-2015
Volume 8
Year Published 2015
Language English
Publisher European Geosciences Union
Publisher location Katlenburg-Lindau, Germany
Contributing office(s) South Dakota Water Science Center, Dakota Water Science Center
Description 16 p.
First page 865
Last page 880
Online Only (Y/N) N
Additional Online Files (Y/N) N
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