03-13-2014
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<br />HMG_TO9‐A10_Long.docx 9 <br />ii. The study area is the area within the Risk Reduction Area that is affected <br />by the flow coming across the Maple River Aqueduct. <br />iii. Account for coincident flows on the Sheyenne River and other local drains <br />and ditches. <br />iv. Select Maple River design flows such that insurable structures in the Risk <br />Reduction Area, and within the expected future 1% Maple River floodplain, <br />are minimally affected by the Maple River design flows and the coincident <br />flows on the Sheyenne River and the other local drains and ditches in the <br />Risk Reduction Area. <br />b) Establish Maple River design flows across the Maple River Aqueduct for the 1% and <br />0.2% flood events. <br />c) Recommend a maximum Maple River flow across the Maple River Aqueduct for the <br />Standard Project Flood (SPF) event. <br />Deliverables: <br />a) Preliminary unsteady HEC‐RAS models. <br />b) Final unsteady HEC‐RAS input and output files. <br />c) 20‐year existing conditions model results. <br />d) Final Technical Memorandum. <br />IX. UPDATE HEC‐RAS MODELS – MAPLE RIVER AQUEDUCT AND REACH 6 BRIDGE <br />a) Modify the unsteady‐flow HEC‐RAS model to reflect the lateral structure and <br />spillway changes recommended by the Maple River aqueduct study team. <br />b) Update the flow profile information (1% and 0.2% chance events, and 103,000 cfs <br />event) needed for the bridge design effort, using the current Phase 7 unsteady‐flow <br />HEC‐RAS model as the source of the geometry for the steady‐flow HEC‐RAS model. <br />Continue to use the bridge design criteria provided in MFR‐005 (General Bridge Re‐ <br />Assessment for the Diversion from Inlet to Outlet) to determine the low‐chord <br />elevation and hydraulic opening of bridges in the Diversion Channel. <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 />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 />DR <br />A <br />F <br />T
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