topic How to determine when a river makes a 90 degree turn. in Water Resources Questions https://community.esri.com/t5/water-resources-questions/how-to-determine-when-a-river-makes-a-90-degree/m-p/527868#M2718 <HTML><HEAD></HEAD><BODY><SPAN>I am new to Hydro. I am trying to find a way to select or highlight a river when it makes a 90 degree turn. For example if the Nile </SPAN><BR /><SPAN>flows S.-N. its origin is at 180 degrees and its end point is roughly 1 degree. I am searching for a way to show rivers that make a 90 </SPAN><BR /><SPAN>degree turn or an "L" shape. I am ok with a river's azimuth being +-10 or 15 degrees from straight.</SPAN><BR /><BR /><SPAN>What tool can I use to accomplish this?</SPAN><BR /><BR /><SPAN>I have downloaded some files from the NHD from USGS.</SPAN></BODY></HTML> Thu, 29 Nov 2012 17:16:00 GMT KariFlynn_Smith 2012-11-29T17:16:00Z How to determine when a river makes a 90 degree turn. https://community.esri.com/t5/water-resources-questions/how-to-determine-when-a-river-makes-a-90-degree/m-p/527868#M2718 <HTML><HEAD></HEAD><BODY><SPAN>I am new to Hydro. I am trying to find a way to select or highlight a river when it makes a 90 degree turn. For example if the Nile </SPAN><BR /><SPAN>flows S.-N. its origin is at 180 degrees and its end point is roughly 1 degree. I am searching for a way to show rivers that make a 90 </SPAN><BR /><SPAN>degree turn or an "L" shape. I am ok with a river's azimuth being +-10 or 15 degrees from straight.</SPAN><BR /><BR /><SPAN>What tool can I use to accomplish this?</SPAN><BR /><BR /><SPAN>I have downloaded some files from the NHD from USGS.</SPAN></BODY></HTML> Thu, 29 Nov 2012 17:16:00 GMT https://community.esri.com/t5/water-resources-questions/how-to-determine-when-a-river-makes-a-90-degree/m-p/527868#M2718 KariFlynn_Smith 2012-11-29T17:16:00Z