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Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
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Hydrograph separation of subsurface tile discharge.

Keith E Schilling1, Christopher S Jones2

  • 1Iowa Geological Survey, University of Iowa, Iowa City, IA, 52242, USA. keith-schilling@uiowa.edu.

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|March 22, 2019
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Summary
This summary is machine-generated.

Quantifying baseflow in tile drainage is crucial for watershed hydrology. This study found baseflow comprises 60% of annual tile discharge, peaking in June, and suggests digital filters improve accuracy.

Keywords:
BaseflowDrainage districtsHydrograph separationIowaTile drainage

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Area of Science:

  • Hydrology
  • Agricultural Science
  • Environmental Science

Background:

  • Baseflow is a key component of streamflow and watershed hydrologic budgets.
  • Quantifying the baseflow fraction of tile drainage is rarely reported, hindering accurate water management.
  • Understanding subsurface flow paths is critical for agricultural landscapes.

Purpose of the Study:

  • To quantify the baseflow fraction of tile drainage in Iowa.
  • To compare the effectiveness of two hydrograph separation methods for tile drainage analysis.
  • To provide data for improving nutrient reduction strategies in tiled landscapes.

Main Methods:

  • Hydrograph separation using the local minimum method and a recursive digital filter.
  • Analysis of discharge data from three drainage district tiles in Iowa (2009-2013).
  • Comparison of baseflow estimation accuracy between the two separation methods.

Main Results:

  • Annual baseflow ranged from 116 to 162 mm, comprising approximately 60% of annual discharge.
  • Baseflow peaked in June (34% of annual baseflow), with 86% occurring between March and August.
  • The recursive digital filter method provided less erratic baseflow fraction estimates compared to the local minimum method.

Conclusions:

  • Baseflow significantly contributes to tile drainage discharge in agricultural watersheds.
  • The recursive digital filter is a more reliable method for baseflow separation in tile drainage systems.
  • Accurate quantification of hydrologic pathways is essential for effective nutrient management strategies.