DES MOINES RIVER RESERVOIRS WATER CONTROL PLAN UPDATES IOWA ASCE WATER RESOURCES DESIGN CONFERENCE

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1 DES MOINES RIVER RESERVOIRS WATER CONTROL PLAN UPDATES IOWA ASCE WATER RESOURCES DESIGN CONFERENCE Kevin Landwehr, P.E., D.WRE Rock Island District U.S. Army Corps of Engineers 6 April 2017 The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation

2 PRESENTATION OVERVIEW Purpose and Motivation For Updates Overview of the Reservoir Projects and their Congressionally Authorized Purposes Current Water Control Plan Philosophy Challenges and Concepts Being Evaluated Study Timeline and Status

3 SCOPE OF STUDY USACE has initiated an update of the Des Moines River Reservoir Regulation Manual which includes the Water Control Plans for Saylorville Lake and Lake Red Rock. Water control plans provide decision making guidance for water management of each individual reservoir or system of reservoirs and ensure the operations of reservoirs conform to laws and applicable USACE rules. Water control plans consist of operational parameters that define when, and how much, water is stored and released. These include a schedule of releases, conservation pool levels to be maintained during non-flood or drought conditions, and downstream water level constraints.

4 SCOPE OF STUDY (CONT.) Focus of the study is how to best manage water with the existing, authorized project. Important to understand that: There will always be a residual risk of flooding. No alternative plan can prevent all flooding or drought (capacity of the reservoirs is limited), goal is to identify the water management strategy (plan) that allows us to best meet the Congressionally authorized project purposes. Continued risk communication is important! Changes in the water control plans that affect when reservoir storage is utilized (and associated release rates) generally involve trade-offs. Stakeholder input is critical to evaluating the benefits and impacts associated with alternative plans.

5 DES MOINES RIVER BASIN 5

6 SAYLORVILLE LAKE Authorized by Congress - 3 July 1958 Initial filling to conservation level in September 1977 Modifications to Regulations: 1982 Pool raised from 833 feet to 836 feet as part of the Water Supply Contract (Iowa) 1994 Pneumatic Crest Gates installed on overflow spillway section

7 LAKE RED ROCK Authorized by Congress - 28 June 1938 Construction completed in 1969 Modifications to Regulations 1979 Conservation Pool raised from 725 feet to 728 feet 1982 Flash Flood Operation was Implemented (10.8 feet at Ottumwa) 1988 Conservation Pool raised from 728 feet to 734 feet; Maximum growing season release raised to 22,000 cfs when pool exceeds 760 feet; Start of the growing season changed from 21 April to 01 May 1992 Pool raised from 734 feet to 742 feet

8 CONGRESSIONALLY AUTHORIZED PURPOSES Saylorville Lake and Lake Red Rock: Flood Risk Management (Primary) Des Moines and Upper Mississippi Rivers Water Conservation/Low Flow Augmentation Water Supply (Saylorville only) Fish and Wildlife Recreation* Private Hydropower Development Currently Under Construction at Lake Red Rock *Access and facilities are provided for recreation but water is not controlled for this purpose.

9 WHY UPDATE THE WATER CONTROL PLANS? 9 Floods of 1993, 2008, Conditions change over time and it is important to periodically review and update the water control plan to address current and anticipated future conditions. What has changed? Observed changes in the frequency and magnitude of flood and drought events. Changes in land use and flood risk management infrastructure (e.g., levees within the City of Des Moines). Impacts of Sedimentation.

10 ANNUAL PRECIPITATION CENTRAL IOWA 10

11 35,000 Saylorville Reservoir Peak 30-Day Inflow ,000 25,000 Peak 30-Day Inflow (cfs) 20,000 15,000 10,000 5,

12 80,000 Red Rock Reservoir Peak 30-Day Inflow ,000 60,000 Peak 30-Day Inflow (cfs) 50,000 40,000 30,000 20,000 10,

13 13

14 WHY UPDATE THE WATER CONTROL PLANS? 14 Floods of 1993, 2008, 2010 Conditions change over time and it is important to periodically review and update the water control plan to address current and anticipated future conditions. What has changed? Observed changes in the frequency and magnitude of flood and drought events. Changes in land use and flood risk management infrastructure (e.g., levees within the City of Des Moines). Impacts of Sedimentation.

15 IMPACTS OF SEDIMENTATION Sedimentation was anticipated as part of original reservoir design. Greatest impact is to conservation storage, impacting: drought management, natural resource management, and recreation. Reduction in Flood Control Storage Since Impoundment Saylorville 1.3% Red Rock 16% Coralville 12.5% Reduction in Conservation Storage Since Impoundment Saylorville 19% Red Rock 44% Coralville 64% 15

16 OVERVIEW OF CURRENT WATER CONTROL PLANS 16 Water control plans consist of operational parameters that define how, and when, water is stored and released. These include a schedule of releases, conservation pool levels to be maintained during non-flood or drought conditions, and downstream water level constraints. Approved by Mississippi Valley Division Commander. Contain provisions for deviations from approved plans. Subject to approval by Division Commander.

17 GENERAL PHILOSOPHY OF WATER CONTROL PLANS 17 Saylorville Lake and Lake Red Rock are operated as a system. During non-flood or drought periods release reservoir inflow to maintain conservation pool. Normal Flood Operations - During flood events limit release to safe discharge, allowing for tributary inflows downstream of the reservoir; excess inflow is stored in the reservoir. Reservoir Balancing of flood storage

18 Des Moines River Reservoirs and Constraints Des Moines River Basin Raccoon River Basin!? Saylorville Lake Reservoir!? SE 6th Street, Des Moines, Iowa!? Lake Red Rock Reservoir!? Ottumwa, Iowa!? Keosauqua, Iowa!? Burlington, Iowa Quincy, Illinois BUILDING!? STRONG

19 770 Reservoir Pool Elevation Operation of Lake Red Rock Summer of 1998 Top of Full Flood Control Pool Elevation ft. NGVD 80, , ,000 Normal Conservation Pool Elevation ft. NGVD Elevation (ft. NGVD) Lake Red Rock Inflow 50,000 40,000 30,000 Flow (cfs) 710 Lake Red Rock Outflow 20, , Jun 8-Jun 15-Jun 22-Jun 29-Jun 6-Jul 13-Jul 20-Jul 27-Jul 3-Aug 10-Aug 17-Aug 24-Aug 31-Aug 1998

20 GENERAL PHILOSOPHY OF WATER CONTROL PLANS 20 Saylorville Lake and Lake Red Rock are operated as a system. During non-flood or drought periods release reservoir inflow to maintain conservation pool. Normal Flood Operations - During flood events limit release to safe discharge, allowing for tributary inflows downstream of the reservoir; excess inflow is stored in the reservoir. Reservoir Balancing of flood storage Large Magnitude Flood Operations - If a significant portion of the reservoir storage has been utilized, begin releasing progressively higher flows. Downstream constraints are no longer in effect.

21 GENERAL PHILOSOPHY OF WATER CONTROL PLANS (CONT.) 21 If the full flood control capacity is exceeded, outflows are increased further and focus of operations is on dam safety. Following flood events, outflows are managed to evacuate flood storage as quickly as possible, controlling the rate of fall within the reservoir. During periods of drought (inflow falls below minimum desired conservation flow), augment inflows with conservation storage to maintain desired conservation releases (coordinated with Iowa DNR). If reservoir continues to fall, progressively scale back releases giving highest priority to water supply.

22 STATE OF IOWA WATER SUPPLY CONTRACT In 1982 Iowa purchased storage in Saylorville Lake for consumptive water supply 18.86% of conservation storage This storage was determined to provide a continuous flow of 75 cfs with 99% reliability Reliability has reduced over time due to sedimentation in reservoir Conservation pool was raised 3 feet to accommodate the contract State has authority to withdraw water from the lake or to order releases through the outlet works Iowa has subcontracted 2/3 of the water to the Des Moines Water Works and 1/3 to Alliant Energy

23 CHALLENGES AND CONCEPTS 23 Managing flood volume vs. managing flood risk. Need for flexibility in plan. File Name

24 Lake Red Rock Growing Season (May 1 Dec 15) Water Control Plan * Storage values based upon 2011 survey. Current Plan Overview Top of Dam Elevation feet 60, ,000 cfs maximum release based on pool elevation up to Elevation 785; uncontrolled (open spillway) release thereafter. No downstream constraints on release. Elevation 780 Full Flood Control Pool 100 % Flood Control Storage Utilized 30,000 60,000 cfs maximum release based on reservoir elevation. No downstream constraints on release. Elevation 775 Start of Large Magnitude Flood Operation 79 % Flood Control Storage Utilized 22,000 cfs maximum release. Reduce releases below maximum release as needed to maintain Ottumwa and Keosauqua Gages below 8.7 and 18.4 feet, respectively (5,000 cfs minimum release). If Burlington or Quincy Gage on Upper Mississippi River is forecast to exceed 18.5 or 20.0 feet, respectively, reduce outflow to reduce peak on Mississippi to the extent possible (variable minimum release based on reservoir elevation). Elevation % Flood Control Storage Utilized Design Flood Surcharge Storage Flood Control Storage 1,463,250 Acre-Feet* 18,000 cfs maximum release. Reduce releases below maximum release as needed to maintain Ottumwa and Keosauqua Gages below 7.5 and 17.6 feet, respectively (5,000 cfs minimum release). If Burlington or Quincy Gage on Upper Mississippi River is forecast to exceed 18.5 or 20.0 feet, respectively, reduce outflow to reduce peak on Mississippi to the extent possible (variable minimum release based on reservoir elevation). Elevation 742 Conservation Pool 0 % Flood Control Storage Utilized Maintain 300 cfs minimum conservation release until reservoir falls to elevation Progressively lower releases as reservoir continues to fall. Elevation 744 Seasonal (Fall) Conservation Pool Raise Conservation Storage 185,450 Acre-Feet

25 CHALLENGES AND CONCEPTS 25 Managing flood volume vs. managing flood risk. Need for flexibility in plan. Increase water in the system and the need to evaluate tradeoffs in FRM benefits. File Name

26 EVALUATION TOOLS Leveraging modeling tools developed as part of USACE ational modernization of Corps Water Management System (CWMS) HEC-ResSim HEC-RAS HEC-FIA 26 File Name

27 CHALLENGES AND CONCEPTS 27 Managing flood volume vs. managing flood risk. Need for flexibility in plan. Increase water in the system and the need to evaluate tradeoffs in FRM benefits. Reservoir balancing. File Name

28 CHALLENGES AND CONCEPTS 28 Managing flood volume vs. managing flood risk. Need for flexibility in plan. Increase water in the system and the need to evaluate tradeoffs in FRM benefits. Reservoir balancing. Future Sedimentation and Balancing Drought and Flood Storage Considerations. File Name

29 OPPORTUNITY! 29 SUSTAINABLE RIVERS PROJECT Partnership with The Nature Conservancy to achieve more ecologically sustainable flows, while maintaining or enhancing project benefits. Currently working with natural resource agencies to identify alternative strategies that could be included in the water control plans to provide environmental benefits (habitat, improved water quality, etc.).

30 UPDATE STUDY TIMELINE 30 Began Planning Process Oct 2016 Public Scoping Meeting Jan/Feb 2017 Identify and Evaluate Alternatives Feb - Oct 2017 Draft Recommendation/Report Dec 2017 Agency and Public Review Feb - May 2018 Final Approved Manual Sep 2018

31 31

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