<?xml version="1.0"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="cy">
	<id>https://cof.canolfanuwchgwyrfai.cymru/index.php?action=history&amp;feed=atom&amp;title=Llyn_Bwlch-y-moch</id>
	<title>Llyn Bwlch-y-moch - Hanes golygu</title>
	<link rel="self" type="application/atom+xml" href="https://cof.canolfanuwchgwyrfai.cymru/index.php?action=history&amp;feed=atom&amp;title=Llyn_Bwlch-y-moch"/>
	<link rel="alternate" type="text/html" href="https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;action=history"/>
	<updated>2026-05-06T19:26:11Z</updated>
	<subtitle>Hanes diwygio&#039;r dudalen hon ar y wici</subtitle>
	<generator>MediaWiki 1.43.1</generator>
	<entry>
		<id>https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=13054&amp;oldid=prev</id>
		<title>Cyfaill Eben am 16:32, 2 Mawrth 2022</title>
		<link rel="alternate" type="text/html" href="https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=13054&amp;oldid=prev"/>
		<updated>2022-03-02T16:32:50Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;cy&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Fersiwn hŷn&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Fersiwn yn ôl 17:32, 2 Mawrth 2022&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot;&gt;Llinell 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Llinell 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cronfa ddŵr oedd &#039;&#039;&#039;Llyn Bwlch-y-moch&#039;&#039;&#039; a grewyd rywbryd ar ôl 1840&amp;lt;ref&amp;gt;Gwefan &#039;&#039;Scandal on Ben Nevis&#039;&#039;, [http://www.thegallivantingjournals.co.uk/blog/retro/llyn-bwlch-y-moch-drws-y-coed/], cyrchwyd 16.2.2021&amp;lt;/ref&amp;gt; ychydig i&#039;r gogledd o [[Llyn y Dywarchen|Lyn y Dywarchen]], ar ben [[Bwlch y Moch]] ac yr ochr arall i fynydd [[Clogwyn y Garreg]]. Pwrpas y gronfa ddŵr oedd sicrhau digon o ddŵr cyson ar gyfer [[Gwaith copr Simdde&#039;r Dylluan]], a bu&#039;n darddiad [[Afon Llyfni]] wedi i Lyn y Dywarchen hefyd  gael ei addasu&#039;n gronfa ddŵr, a&#039;r dŵr yn yr achos hwnnw gael ei ddargyfeirio i ddyffryn [[Afon Gwyrfai]] at ddibenion y chwareli yno. Pan aeth &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;y dam yn &lt;/del&gt;fregus yn y 1950au, penderfynodd y perchnogion, [[Ystad y Faenol]], agor &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;y dam &lt;/del&gt;rhag iddo &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;roi a chreu &lt;/del&gt;llifogydd yn &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Nhrws&lt;/del&gt;-y-coed. Serch hynny, mae olion &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;y dam &lt;/del&gt;a physt clymu cychod &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;pysgodwyr &lt;/del&gt;yn dal i&#039;w gweld yn yr hyn sydd ar ôl, sef darn o gorsdir.&amp;lt;ref&amp;gt;Geraint Thomas, &#039;&#039;Cyfrinachau Llynnoedd Eryri&#039;&#039; (Tal-y-bont, 2011), t.50&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cronfa ddŵr oedd &#039;&#039;&#039;Llyn Bwlch-y-moch&#039;&#039;&#039; a grewyd rywbryd ar ôl 1840&amp;lt;ref&amp;gt;Gwefan &#039;&#039;Scandal on Ben Nevis&#039;&#039;, [http://www.thegallivantingjournals.co.uk/blog/retro/llyn-bwlch-y-moch-drws-y-coed/], cyrchwyd 16.2.2021&amp;lt;/ref&amp;gt; ychydig i&#039;r gogledd o [[Llyn y Dywarchen|Lyn y Dywarchen]], ar ben [[Bwlch y Moch]] ac yr ochr arall i fynydd [[Clogwyn y Garreg]]. Pwrpas y gronfa ddŵr oedd sicrhau digon o ddŵr cyson ar gyfer [[Gwaith copr Simdde&#039;r Dylluan]], a bu&#039;n darddiad [[Afon Llyfni]] wedi i Lyn y Dywarchen hefyd  gael ei addasu&#039;n gronfa ddŵr, a&#039;r dŵr yn yr achos hwnnw gael ei ddargyfeirio i ddyffryn [[Afon Gwyrfai]] at ddibenion y chwareli yno. Pan aeth &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;yr argae&#039;n &lt;/ins&gt;fregus yn y 1950au, penderfynodd y perchnogion, [[Ystad y Faenol]], agor &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;yr argae &lt;/ins&gt;rhag iddo &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;achosi &lt;/ins&gt;llifogydd yn &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Nrws&lt;/ins&gt;-y-coed. Serch hynny, mae olion &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;yr argae &lt;/ins&gt;a physt clymu cychod &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;pysgotwyr &lt;/ins&gt;yn dal i&#039;w gweld yn yr hyn sydd ar ôl, sef darn o gorsdir.&amp;lt;ref&amp;gt;Geraint Thomas, &#039;&#039;Cyfrinachau Llynnoedd Eryri&#039;&#039; (Tal-y-bont, 2011), t.50&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{eginyn}}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{eginyn}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Cyfaill Eben</name></author>
	</entry>
	<entry>
		<id>https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=10908&amp;oldid=prev</id>
		<title>Irion am 09:19, 17 Chwefror 2021</title>
		<link rel="alternate" type="text/html" href="https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=10908&amp;oldid=prev"/>
		<updated>2021-02-17T09:19:43Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;cy&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Fersiwn hŷn&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Fersiwn yn ôl 10:19, 17 Chwefror 2021&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot;&gt;Llinell 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Llinell 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cronfa ddŵr oedd &#039;&#039;&#039;Llyn Bwlch-y-moch&#039;&#039;&#039; a grewyd rywbryd ar ôl 1840&amp;lt;ref&amp;gt;Gwefan &#039;&#039;Scandal on Ben Nevis&#039;&#039;, [http://www.thegallivantingjournals.co.uk/blog/retro/llyn-bwlch-y-moch-drws-y-coed/], cyrchwyd 16.2.2021&amp;lt;/ref&amp;gt; ychydig i&#039;r gogledd o [[Llyn y Dywarchen|Lyn y Dywarchen]], ar ben [[Bwlch&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;-&lt;/del&gt;y&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;-moch&lt;/del&gt;]] ac yr ochr arall i fynydd [[Clogwyn y Garreg]]. Pwrpas y gronfa ddŵr oedd sicrhau digon o ddŵr cyson ar gyfer [[Gwaith copr Simdde&#039;r Dylluan]], a bu&#039;n darddiad [[Afon Llyfni]] wedi i Lyn y Dywarchen hefyd  gael ei addasu&#039;n gronfa ddŵr, a&#039;r dŵr yn yr achos hwnnw gael ei ddargyfeirio i ddyffryn [[Afon Gwyrfai]] at ddibenion y chwareli yno. Pan aeth y dam yn fregus yn y 1950au, penderfynodd y perchnogion, [[Ystad y Faenol]], agor y dam rhag iddo roi a chreu llifogydd yn Nhrws-y-coed. Serch hynny, mae olion y dam a physt clymu cychod pysgodwyr yn dal i&#039;w gweld yn yr hyn sydd ar ôl, sef darn o gorsdir.&amp;lt;ref&amp;gt;Geraint Thomas, &#039;&#039;Cyfrinachau Llynnoedd Eryri&#039;&#039; (Tal-y-bont, 2011), t.50&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cronfa ddŵr oedd &#039;&#039;&#039;Llyn Bwlch-y-moch&#039;&#039;&#039; a grewyd rywbryd ar ôl 1840&amp;lt;ref&amp;gt;Gwefan &#039;&#039;Scandal on Ben Nevis&#039;&#039;, [http://www.thegallivantingjournals.co.uk/blog/retro/llyn-bwlch-y-moch-drws-y-coed/], cyrchwyd 16.2.2021&amp;lt;/ref&amp;gt; ychydig i&#039;r gogledd o [[Llyn y Dywarchen|Lyn y Dywarchen]], ar ben [[Bwlch y &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Moch&lt;/ins&gt;]] ac yr ochr arall i fynydd [[Clogwyn y Garreg]]. Pwrpas y gronfa ddŵr oedd sicrhau digon o ddŵr cyson ar gyfer [[Gwaith copr Simdde&#039;r Dylluan]], a bu&#039;n darddiad [[Afon Llyfni]] wedi i Lyn y Dywarchen hefyd  gael ei addasu&#039;n gronfa ddŵr, a&#039;r dŵr yn yr achos hwnnw gael ei ddargyfeirio i ddyffryn [[Afon Gwyrfai]] at ddibenion y chwareli yno. Pan aeth y dam yn fregus yn y 1950au, penderfynodd y perchnogion, [[Ystad y Faenol]], agor y dam rhag iddo roi a chreu llifogydd yn Nhrws-y-coed. Serch hynny, mae olion y dam a physt clymu cychod pysgodwyr yn dal i&#039;w gweld yn yr hyn sydd ar ôl, sef darn o gorsdir.&amp;lt;ref&amp;gt;Geraint Thomas, &#039;&#039;Cyfrinachau Llynnoedd Eryri&#039;&#039; (Tal-y-bont, 2011), t.50&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{eginyn}}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{eginyn}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Irion</name></author>
	</entry>
	<entry>
		<id>https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=10902&amp;oldid=prev</id>
		<title>Irion am 21:12, 16 Chwefror 2021</title>
		<link rel="alternate" type="text/html" href="https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=10902&amp;oldid=prev"/>
		<updated>2021-02-16T21:12:19Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;cy&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Fersiwn hŷn&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Fersiwn yn ôl 22:12, 16 Chwefror 2021&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot;&gt;Llinell 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Llinell 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cronfa ddŵr oedd &#039;&#039;&#039;Llyn Bwlch-y-moch&#039;&#039;&#039; a grewyd rywbryd ar ôl 1840 ychydig i&#039;r gogledd o [[Llyn y Dywarchen|Lyn y Dywarchen]], ar ben [[Bwlch-y-moch]] ac yr ochr arall i fynydd [[Clogwyn y Garreg]]. Pwrpas y gronfa ddŵr oedd sicrhau digon o ddŵr cyson ar gyfer [[Gwaith &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Copr &lt;/del&gt;Simdde&#039;r Dylluan]], a bu&#039;n darddiad [[Afon &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Llyfnwy&lt;/del&gt;]] wedi i Lyn y Dywarchen hefyd  gael ei addasu&#039;n gronfa ddŵr, a&#039;r dŵr yn yr achos hwnnw gael ei ddargyfeirio i ddyffryn [[Afon Gwyrfai]] at ddibenion y chwareli yno. Pan aeth y dam yn fregus yn y 1950au, penderfynodd y perchnogion, [[Ystad y Faenol]], agor y dam rhag iddo roi a chreu llifogydd yn Nhrws-y-coed. Serch hynny, mae olion y dam a physt clymu cychod pysgodwyr yn dal i&#039;w gweld yn yr hyn sydd ar ôl, sef darn o gorsdir.&amp;lt;ref&amp;gt;Geraint Thomas, &#039;&#039;Cyfrinachau Llynnoedd Eryri&#039;&#039; (Tal-y-bont, 2011), t.50&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cronfa ddŵr oedd &#039;&#039;&#039;Llyn Bwlch-y-moch&#039;&#039;&#039; a grewyd rywbryd ar ôl 1840&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&amp;lt;ref&amp;gt;Gwefan &#039;&#039;Scandal on Ben Nevis&#039;&#039;, [http://www.thegallivantingjournals.co.uk/blog/retro/llyn-bwlch-y-moch-drws-y-coed/], cyrchwyd 16.2.2021&amp;lt;/ref&amp;gt; &lt;/ins&gt;ychydig i&#039;r gogledd o [[Llyn y Dywarchen|Lyn y Dywarchen]], ar ben [[Bwlch-y-moch]] ac yr ochr arall i fynydd [[Clogwyn y Garreg]]. Pwrpas y gronfa ddŵr oedd sicrhau digon o ddŵr cyson ar gyfer [[Gwaith &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;copr &lt;/ins&gt;Simdde&#039;r Dylluan]], a bu&#039;n darddiad [[Afon &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Llyfni&lt;/ins&gt;]] wedi i Lyn y Dywarchen hefyd  gael ei addasu&#039;n gronfa ddŵr, a&#039;r dŵr yn yr achos hwnnw gael ei ddargyfeirio i ddyffryn [[Afon Gwyrfai]] at ddibenion y chwareli yno. Pan aeth y dam yn fregus yn y 1950au, penderfynodd y perchnogion, [[Ystad y Faenol]], agor y dam rhag iddo roi a chreu llifogydd yn Nhrws-y-coed. Serch hynny, mae olion y dam a physt clymu cychod pysgodwyr yn dal i&#039;w gweld yn yr hyn sydd ar ôl, sef darn o gorsdir.&amp;lt;ref&amp;gt;Geraint Thomas, &#039;&#039;Cyfrinachau Llynnoedd Eryri&#039;&#039; (Tal-y-bont, 2011), t.50&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{eginyn}}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{eginyn}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Irion</name></author>
	</entry>
	<entry>
		<id>https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=10901&amp;oldid=prev</id>
		<title>Irion am 21:10, 16 Chwefror 2021</title>
		<link rel="alternate" type="text/html" href="https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=10901&amp;oldid=prev"/>
		<updated>2021-02-16T21:10:23Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;cy&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Fersiwn hŷn&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Fersiwn yn ôl 22:10, 16 Chwefror 2021&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot;&gt;Llinell 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Llinell 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cronfa ddŵr oedd &#039;&#039;&#039;Llyn Bwlch-y-moch&#039;&#039;&#039; a grewyd ychydig i&#039;r gogledd o [[Llyn y Dywarchen|Lyn y Dywarchen]], ar ben [[Bwlch-y-moch]] ac yr ochr arall i fynydd [[Clogwyn y Garreg]]. Pwrpas y gronfa ddŵr oedd sicrhau digon o ddŵr cyson ar gyfer [[Gwaith Copr Simdde&#039;r Dylluan]], a bu&#039;n darddiad [[Afon Llyfnwy]] wedi i Lyn y Dywarchen hefyd  gael ei addasu&#039;n gronfa ddŵr, a&#039;r dŵr yn yr achos hwnnw gael ei ddargyfeirio i ddyffryn [[Afon Gwyrfai]] at ddibenion y chwareli yno. Pan aeth y dam yn fregus yn y 1950au, penderfynodd y perchnogion, [[Ystad y Faenol]], agor y dam rhag iddo roi a chreu llifogydd yn Nhrws-y-coed. Serch hynny, mae olion y dam a physt clymu cychod pysgodwyr yn dal i&#039;w gweld yn yr hyn sydd ar ôl, sef darn o gorsdir.&amp;lt;ref&amp;gt;Geraint Thomas, &#039;&#039;Cyfrinachau Llynnoedd Eryri&#039;&#039; (Tal-y-bont, 2011), t.50&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Cronfa ddŵr oedd &#039;&#039;&#039;Llyn Bwlch-y-moch&#039;&#039;&#039; a grewyd &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;rywbryd ar ôl 1840 &lt;/ins&gt;ychydig i&#039;r gogledd o [[Llyn y Dywarchen|Lyn y Dywarchen]], ar ben [[Bwlch-y-moch]] ac yr ochr arall i fynydd [[Clogwyn y Garreg]]. Pwrpas y gronfa ddŵr oedd sicrhau digon o ddŵr cyson ar gyfer [[Gwaith Copr Simdde&#039;r Dylluan]], a bu&#039;n darddiad [[Afon Llyfnwy]] wedi i Lyn y Dywarchen hefyd  gael ei addasu&#039;n gronfa ddŵr, a&#039;r dŵr yn yr achos hwnnw gael ei ddargyfeirio i ddyffryn [[Afon Gwyrfai]] at ddibenion y chwareli yno. Pan aeth y dam yn fregus yn y 1950au, penderfynodd y perchnogion, [[Ystad y Faenol]], agor y dam rhag iddo roi a chreu llifogydd yn Nhrws-y-coed. Serch hynny, mae olion y dam a physt clymu cychod pysgodwyr yn dal i&#039;w gweld yn yr hyn sydd ar ôl, sef darn o gorsdir.&amp;lt;ref&amp;gt;Geraint Thomas, &#039;&#039;Cyfrinachau Llynnoedd Eryri&#039;&#039; (Tal-y-bont, 2011), t.50&amp;lt;/ref&amp;gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{eginyn}}&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{eginyn}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Irion</name></author>
	</entry>
	<entry>
		<id>https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=9490&amp;oldid=prev</id>
		<title>Hebog am 20:04, 12 Tachwedd 2020</title>
		<link rel="alternate" type="text/html" href="https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=9490&amp;oldid=prev"/>
		<updated>2020-11-12T20:04:40Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;cy&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Fersiwn hŷn&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Fersiwn yn ôl 21:04, 12 Tachwedd 2020&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l7&quot;&gt;Llinell 7:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Llinell 7:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Categori:Llynnoedd]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Categori:Llynnoedd]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Categori:Cronfeydd &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Dŵr&lt;/del&gt;]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Categori:Cronfeydd &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;dŵr&lt;/ins&gt;]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Hebog</name></author>
	</entry>
	<entry>
		<id>https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=9485&amp;oldid=prev</id>
		<title>Hebog am 19:50, 12 Tachwedd 2020</title>
		<link rel="alternate" type="text/html" href="https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=9485&amp;oldid=prev"/>
		<updated>2020-11-12T19:50:41Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;cy&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Fersiwn hŷn&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Fersiwn yn ôl 20:50, 12 Tachwedd 2020&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l7&quot;&gt;Llinell 7:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Llinell 7:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Categori:Llynnoedd]]&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot;&gt;&lt;/td&gt;&lt;td style=&quot;background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[Categori:Llynnoedd]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[Categori:Cronfeydd Dŵr]]&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Hebog</name></author>
	</entry>
	<entry>
		<id>https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=9484&amp;oldid=prev</id>
		<title>Hebog: Crëwyd tudalen newydd yn dechrau gyda &#039;Cronfa ddŵr oedd &#039;&#039;&#039;Llyn Bwlch-y-moch&#039;&#039;&#039; a grewyd ychydig i&#039;r gogledd o Lyn y Dywarchen, ar ben Bwlch-y-moch ac yr ochr arall i...&#039;</title>
		<link rel="alternate" type="text/html" href="https://cof.canolfanuwchgwyrfai.cymru/index.php?title=Llyn_Bwlch-y-moch&amp;diff=9484&amp;oldid=prev"/>
		<updated>2020-11-12T19:49:01Z</updated>

		<summary type="html">&lt;p&gt;Crëwyd tudalen newydd yn dechrau gyda &amp;#039;Cronfa ddŵr oedd &amp;#039;&amp;#039;&amp;#039;Llyn Bwlch-y-moch&amp;#039;&amp;#039;&amp;#039; a grewyd ychydig i&amp;#039;r gogledd o &lt;a href=&quot;/wici/Llyn_y_Dywarchen&quot; title=&quot;Llyn y Dywarchen&quot;&gt;Lyn y Dywarchen&lt;/a&gt;, ar ben &lt;a href=&quot;/index.php?title=Bwlch-y-moch&amp;amp;action=edit&amp;amp;redlink=1&quot; class=&quot;new&quot; title=&quot;Bwlch-y-moch (nid yw&amp;#039;r dudalen yn bodoli)&quot;&gt;Bwlch-y-moch&lt;/a&gt; ac yr ochr arall i...&amp;#039;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;Tudalen newydd&lt;/b&gt;&lt;/p&gt;&lt;div&gt;Cronfa ddŵr oedd &amp;#039;&amp;#039;&amp;#039;Llyn Bwlch-y-moch&amp;#039;&amp;#039;&amp;#039; a grewyd ychydig i&amp;#039;r gogledd o [[Llyn y Dywarchen|Lyn y Dywarchen]], ar ben [[Bwlch-y-moch]] ac yr ochr arall i fynydd [[Clogwyn y Garreg]]. Pwrpas y gronfa ddŵr oedd sicrhau digon o ddŵr cyson ar gyfer [[Gwaith Copr Simdde&amp;#039;r Dylluan]], a bu&amp;#039;n darddiad [[Afon Llyfnwy]] wedi i Lyn y Dywarchen hefyd  gael ei addasu&amp;#039;n gronfa ddŵr, a&amp;#039;r dŵr yn yr achos hwnnw gael ei ddargyfeirio i ddyffryn [[Afon Gwyrfai]] at ddibenion y chwareli yno. Pan aeth y dam yn fregus yn y 1950au, penderfynodd y perchnogion, [[Ystad y Faenol]], agor y dam rhag iddo roi a chreu llifogydd yn Nhrws-y-coed. Serch hynny, mae olion y dam a physt clymu cychod pysgodwyr yn dal i&amp;#039;w gweld yn yr hyn sydd ar ôl, sef darn o gorsdir.&amp;lt;ref&amp;gt;Geraint Thomas, &amp;#039;&amp;#039;Cyfrinachau Llynnoedd Eryri&amp;#039;&amp;#039; (Tal-y-bont, 2011), t.50&amp;lt;/ref&amp;gt;&lt;br /&gt;
&lt;br /&gt;
{{eginyn}}&lt;br /&gt;
&lt;br /&gt;
==Cyfeiriadau==&lt;br /&gt;
{{cyfeiriadau}}&lt;br /&gt;
&lt;br /&gt;
[[Categori:Llynnoedd]]&lt;/div&gt;</summary>
		<author><name>Hebog</name></author>
	</entry>
</feed>