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        <title>Where Is the Bottom of a Watershed?</title>
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        <namePart type="given">Laura</namePart>
        <namePart type="given">E</namePart>
        <namePart type="family">Condon</namePart>
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    <name type="personal">
        <namePart type="given">Christa</namePart>
        <namePart type="family">Kelleher</namePart>
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    <name type="personal">
        <namePart type="given">Jeffrey</namePart>
        <namePart type="given">J</namePart>
        <namePart type="family">McDonnell</namePart>
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    <name type="personal">
        <namePart type="given">Grant</namePart>
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    <name type="personal">
        <namePart type="given">Jennifer</namePart>
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            <title>Water Resources Research, Volume 56, Issue 3</title>
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            <issuance>continuing</issuance>
            <publisher>American Geophysical Union (AGU)</publisher>
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    <abstract>Watersheds have served as one of our most basic units of organization in hydrology for over 300 years (Dooge, 1988, https://doi.org/10.1080/02626668809491223; McDonnell, 2017, https://doi.org/10.1038/ngeo2964; Perrault, 1674, https://www.abebooks.com/first‐edition/lorigine‐fontaines‐Perrault‐Pierre‐Petit‐Imprimeur/21599664536/bd). With growing interest in groundwater‐surface water interactions and subsurface flow paths, hydrologists are increasingly looking deeper. But the dialog between surface water hydrologists and groundwater hydrologists is still embryonic, and many basic questions are yet to be posed, let alone answered. One key question is: where is the bottom of a watershed? Knowing where to draw the bottom boundary has not yet been fully addressed in the literature, and how to define the watershed “bottom” is a fraught question. There is large variability across physical and conceptual models regarding how to implement a watershed bottom, and what counts as “deep” varies markedly in different communities. In this commentary, we seek to initiate a dialog on existing approaches to defining the bottom of the watershed. We briefly review the current literature describing how different communities typically frame the answer of just how deep we should look and identify situations where deep flow paths are key to developing realistic conceptual models of watershed systems. We then review the common conceptual approaches used to delineate the watershed lower boundary. Finally, we highlight opportunities to trigger this potential research area at the interface of catchment hydrology and hydrogeology.</abstract>
    <identifier type="citekey">Condon-2020-Where</identifier>
    <identifier type="doi">10.1029/2019wr026010</identifier>
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        <url>https://gwf-uwaterloo.github.io/gwf-publications/G20-62001</url>
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    <part>
        <date>2020</date>
        <detail type="volume"><number>56</number></detail>
        <detail type="issue"><number>3</number></detail>
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%0 Journal Article
%T Where Is the Bottom of a Watershed?
%A Condon, Laura E.
%A Markovich, K. H.
%A Kelleher, Christa
%A McDonnell, Jeffrey J.
%A Ferguson, Grant
%A McIntosh, Jennifer C.
%J Water Resources Research, Volume 56, Issue 3
%D 2020
%V 56
%N 3
%I American Geophysical Union (AGU)
%F Condon-2020-Where
%X Watersheds have served as one of our most basic units of organization in hydrology for over 300 years (Dooge, 1988, https://doi.org/10.1080/02626668809491223; McDonnell, 2017, https://doi.org/10.1038/ngeo2964; Perrault, 1674, https://www.abebooks.com/first‐edition/lorigine‐fontaines‐Perrault‐Pierre‐Petit‐Imprimeur/21599664536/bd). With growing interest in groundwater‐surface water interactions and subsurface flow paths, hydrologists are increasingly looking deeper. But the dialog between surface water hydrologists and groundwater hydrologists is still embryonic, and many basic questions are yet to be posed, let alone answered. One key question is: where is the bottom of a watershed? Knowing where to draw the bottom boundary has not yet been fully addressed in the literature, and how to define the watershed “bottom” is a fraught question. There is large variability across physical and conceptual models regarding how to implement a watershed bottom, and what counts as “deep” varies markedly in different communities. In this commentary, we seek to initiate a dialog on existing approaches to defining the bottom of the watershed. We briefly review the current literature describing how different communities typically frame the answer of just how deep we should look and identify situations where deep flow paths are key to developing realistic conceptual models of watershed systems. We then review the common conceptual approaches used to delineate the watershed lower boundary. Finally, we highlight opportunities to trigger this potential research area at the interface of catchment hydrology and hydrogeology.
%R 10.1029/2019wr026010
%U https://gwf-uwaterloo.github.io/gwf-publications/G20-62001
%U https://doi.org/10.1029/2019wr026010

Markdown (Informal)

[Where Is the Bottom of a Watershed?](https://gwf-uwaterloo.github.io/gwf-publications/G20-62001) (Condon et al., GWF 2020)

• Where Is the Bottom of a Watershed? (Condon et al., GWF 2020)

ACL

• Laura E. Condon, K. H. Markovich, Christa Kelleher, Jeffrey J. McDonnell, Grant Ferguson, Jennifer C. McIntosh, Laura E. Condon, K. H. Markovich, Christa Kelleher, Jeffrey J. McDonnell, Grant Ferguson, and Jennifer C. McIntosh. 2020. Where Is the Bottom of a Watershed?. Water Resources Research, Volume 56, Issue 3, 56(3).