From: Thompson Engineering consultan [mailto:tecnm@yahoo.com]
Sent: Tuesday, February 11, 2014 10:39 AM
To: Cherne, Curtis; Greg Olson
Cc: Rick Beltramo
Subject: Trails DMP Letter and Results of AHYMO Model with no Orifice Plates

Curtis and Greg,

Attached are summary file of the AHYMO run with no orifice plates and a letter summarizing the results. By removing the orifice plates the 2 upstream ponds are way under-utilized and the downstream ponds exceed capacity. Also eliminating the orifice plates results in surcharging the storm drains downstream of the ponds causing storm water to spill into the streets through the inlets and manholes. So, orifice plates are required. Using orifice plates follows the intent of the previous Wilson & Company Trails DMP, which was the basis for the design of the current infrastructure.

Please email or call with any questions you may have.

Thanks,

David B. Thompson, P.E.
Thompson Engineering Consultants, Inc.
P.O. Box 65760
Albuquerque, NM 87193
Office: (505) 271-2199
Fax: (505) 830-9248