Laserfiche WebLink
<br />diversion channel; perform QA/QC of model changes; and evaluate revised model <br />performance for various flood events using the HEC-RAS unsteady flow model. <br />Deliverables: <br />a) Draft Technical Memorandum. <br />b) Final Technical Memorandum. <br />X. WATER MONITORING GAGE SURVEYING <br />a) Prepare and provide maps and coordinates of installation locations for 10 HOBO <br />gages to USGS installation teams. <br />b) After HOBO gages are installed, survey the elevations of the installed gages and <br />provide survey data to USGS. <br /> <br />Deliverables: <br />a) Maps and coordinates of installation locations for 10 HOBO gages. <br />b) Surveyed elevations of 10 HOBO gages. <br />XI. HEC-RAS MODELS - MAPLE RIVER AQUEDUCT <br />a. Provide modeling services to add detail associated with updating HEC-RAS model <br />geometry to be consistent with 2014 changes made on the Maple River aqueduct <br />physical model. Incorporate HEC-RAS cross sections from JV where applicable, <br />combine detailed USACE river survey data into HEC-RAS cross sections, and modify <br />adjacent lateral structures and storage areas. <br />b. Coordinate with USACE to update model geometry for the relocated Maple River <br />channel. The geometry will have a bank-full wetted area consistent with the natural <br />Maple River channel in the vicinity of the proposed aqueduct. <br />c. Modify model geometry so the spillway enters the diversion at a 90 degree angle as <br />a lateral structure. Update the width and the upstream weir elevation of the <br />spillway such that a target 3000 cfs flows through the aqueduct for the 1% event on <br />the Maple River with the water surface elevation just upstream of the spillway <br />being as close as possible to the existing-condition water surface elevation. Include <br />additional coordination with USACE. <br />d. Conduct sensitivity model runs associated with the aqueduct, spillway, and EMB <br />gap for various flood events. Evaluate impacts for 1% chance flood event elevations <br />in the floodplain upstream of the spillway and assess how the project will operate <br />for the SPF event. Determine the proper size and elevation of the EMB gap. <br />e. Provide QA/QC of modeling. <br />Deliverables: <br />a. Updated models. <br />G. BASIN-WIDE RETENTION SUPPORT <br />I. Objective: Assist Owner in supporting retention projects by others in the region. <br />II. Background: The Diversion Board has authorized up to $25 million for Basin-wide <br />Retention Projects that are compatible with, and provide benefits for, the Diversion <br />Project. An initial study is underway by the Red River Basin Commission (RRBC). <br />This subtask is not creditable by USACE. <br />HMG_TO9-A13_Long.docx 10 <br />DR <br />A <br />F <br />T <br /> <br />3/6 <br />/ <br />2 <br />0 <br />1 <br />5 <br />