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I don't know are your routers capable for <a href="http://en.wikipedia.org/wiki/Virtual_Router_Redundancy_Protocol" rel="ugc">Virtual Router Redundancy Protocol (VRRP)</a>, if they are capable, then this could be your solution. You assign virtual IP address to routers and tracking status availability of links to internet, so in case of failure of one route other router forward traffic. That virtual IP address you assign to PCs, then you don't need to change default gateway on PCs, depending on states of links routers switch which one is forward traffic.
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I have two different routers - one is a Draytek 2820 and the other is a Netgear FVS318G.<br />
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I am not sure if either of them do but will have a look.
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Those are not going to help you. No VRRP
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This was a very helpful post and I have since abandoned it but thank you all for your comments
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I've requested that this question be closed as follows:<br />
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Accepted answer: 0 points for cmlbaete's comment <a href="https://www.experts-exchange.com/questions/28565997/Single-Active-Directory-Network-with-Multiple-Gateways.html?anchorAnswerId=40754497#a40754497" rel="ugc">#a40754497</a><br />
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for the following reason:<br />
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This was not a resolution but did provide the answers that were needed for me.
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The post very accurately answered the question.
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<div class="content wysiwyg-content">
I have a simple problem which I hope would be an easy solution. <br />
<br />
I have a single AD network and two Routers to the internet - one on 172.168.0.1 and 172.168.0.2. They are both separate netgear devices. I am running Server 2008 R2<br />
<br />
I have setup DHCP to issue two gateways so that if one fails the other one will take over serving the internet to clients. If I manually change the gateway on the clients it works fine but when I power fail the primary router the secondary router doesn't take over unless you change the settings manually. <br />
<br />
One thing I am wondering is maybe they don't allow failover in this instance like DNS but any advice would be much appreciated. <br />
<br />
Thank you
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I have a simple problem which I hope would be an easy solution. 

I have a single AD network and two Routers to the internet - one on 172.168.0.1 and 172.168.0.2. They are both separate netgear devices. I am running Server 2008 R2

I have setup DHCP to issue two gateways so that if one fails the other one will take over serving the internet to clients. If I manually change the gateway on the clients it works fine but when I power fail the primary router the secondary router doesn't take over unless you change the settings manually. 

One thing I am wondering is maybe they don't allow failover in this instance like DNS but any advice would be much appreciated. 

Thank you

Single Active Directory Network with Multiple Gateways

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.

Networking Protocols

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.