The Branch-Network Dynamic Flow Model--BRANCH--is used to simulate steady or unsteady flow in a single open-channel reach (branch) or throughout a system of branches (network) connected in a dendritic or looped pattern. BRANCH is applicable to a wide range of hydrologic situations wherein flow and transport are governed by time-dependent forcing functions. BRANCH is particularly suitable for simulation of flow in complex geometric configurations involving regular or irregular cross sections of channels having multiple interconnections, but can be easily used to simulate flow in a single, uniform open-channel reach. Time-varying water levels, flow discharges, velocities, and volumes can be computed at any location within the open-channel network. Streamflow routing and computation by the BRANCH model is superior to simplified-routing methods in open-channel reaches wherein severe backwater and (or) dynamic flow conditions prevail. Typical uses of the model encompass the assessment of flow and transport in upland rivers in which flows are highly regulated or backwater effects are evident, or in coastal networks of open channels wherein flow and transport are governed by the interaction of freshwater inflows, tidal action, and meteorological conditions. Surface- and ground-water interactions can be simulated by the coupled BRANCH and USGS modular, three- dimensional, finite-difference ground-water flow (MODFLOW) models, referred to as MODBRNCH.
U.S. GEOLOGICAL SURVEY Role:
h2osoft at usgs.gov
Hydrologic Analysis Software Support Program
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Schaffranek, R.W., Baltzer, R.A., and Goldberg, D.E., 1981, A model for simulation of flow in singular and interconnected channels: U.S. Geological Survey Techniques of Water-Resources Investigations, book 7, chap. 3, 110 p.
Schaffranek, R.W., 1987, Flow model for open-channel reach or network: U.S. Geological Survey Professional Paper 1384, 12 p.
Regan, R.S., and Schaffranek, R.W., 1985, A computer program for analyzing channel geometry: U.S. Geological Survey Water-Resources Investigations Report 85-4335, 49 p.
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