Attachment B - Happy Valley Road_Luddon Mountain.pdf

Ludden Mountain 
ATTACHMENT B
Happy Valley Road: 67th Avenue to 35th Avenue 
Section from Final Technical Memorandum 
Ludden Mountain is located north of HVR across the road from GCCN between 62nd Avenue to 
the west and 55th Avenue to the east. The drainage areas were delineated using 2-ft contours 
received from the Flood Control District of Maricopa County (FCDMC). See Figure 1 below for a 
visual of the drainage areas and flow paths in this area. 
The purple and blue shapes show the drainage areas that would impact the project limits. In 
the existing condition, the flow from the blue drainage area ponds up on the north side of HVR 
during low flow events. While the purple drainage area runoff will flow along the shoulder of 
HVR towards the Entrada subdivision drainage channel. During high flow events, the cross slope 
of HVR at this location allows for the runoff to sheet flow across the road and be collected by 
existing scuppers on the eastbound curb of HVR. These scuppers outfall into the GCCN 
retention basins that will drain to channel system south and east of the site. Any drainage 
areas west of the purple shape will be collected by a concrete drainage ditch running from 
north to south along the edge of the development and will not impact this site. Any drainage 
areas east of the blue shape will be collected by the existing channel that flows towards the 
culvert crossing underneath HVR. 
Figure 1: Ludden Mountain Drainage Areas 
- IOOoct..RLO..n.,ge layout 
- USGS-2020-0PR-OIS2223 l.ft._Cootou'1 
- Ludden"'" Cllamel I-ft eootoo,, 
Off-site Drainage Areas 
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LEGEND: 
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PROPOSED DRIVEWAY AND RIGHT TURN POCKET FOR FUTURE ACCESS TO THE PARK 
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