Gerald H. Grondin Oregon Water Resources Department Groundwater Hydrology Section Salem, Oregon. Lost River Groundwater Surface Water Management

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1 Geologic Framework Influence On Managing Groundwater Interference With Surface Water, A Lost River Sub-Basin Example, Upper Klamath River Basin, Oregon Gerald H. Grondin Oregon Water Resources Department Groundwater Hydrology Section Salem, Oregon

2 Klamath River Basin, Oregon & California Lost River Sub-Basin

3 Lost River Sub-Basin Irrigated Acreages: Surface Water & Groundwater

4 Lost River Sub-Basin Oregon Groundwater Water Right Wells

5 Upper Klamath River Basin Surface Hydrogeologic Units and Geologic Structure Gannett & others (2007)

6 Upper Klamath River Basin Geology: Basin and Range Topography

7 Upper Klamath River Basin Geology: Basin-Fill Deposits

8 Upper Klamath River Basin Geology: Basalt/Volcanics Deposits

9 Lost River Sub-Basin Geologic Cross-Section

10 Lost River Sub-Basin Basalt & Basin-Fill Groundwater is Hydraulically Connected

11 Lost River Sub-Basin Deep & Shallow Groundwater is Hydraulically Connected

12 Lost River Sub-Basin Groundwater & Surface Water is Hydraulically Connected

13 Lower Lost River Sub-Basin Groundwater & Surface Water Connection: Primarily Seepage

14 Lower Lost River Sub-Basin Groundwater & Surface Water Connection: Primarily Seepage

15 Lower Lost River Sub-Basin Groundwater - Surface Water: Seepage (No Pumping)

16 Lower Lost River Sub-Basin Groundwater - Surface Water: Seepage (Basin-Fill Pumping)

17 Lower Lost River Sub-Basin Groundwater - Surface Water: Seepage (Basalt Pumping)

18 Lower Lost River Sub-Basin Groundwater - Surface Water Connection: Seepage Barlow & Leake (2012)

19 Lower Lost River Sub-Basin Groundwater - Surface Water: Seepage (Basalt Pumping) Gannett & Others (2012)

20 Upper Lost River Sub-Basin Groundwater & Surface Water Connection: Springs

21 Upper Lost River Sub-Basin Groundwater & Surface Water Connection: Springs

22 Upper Lost River Sub-Basin Groundwater & Surface Water Connection: Springs

23 Upper Lost River Sub-Basin Groundwater & Surface Water Connection: Springs

24 Upper Lost River Sub-Basin Groundwater & Surface Water Connection: Springs

25 Conclusions 1. Groundwater Occurs in Both Basin-Fill and Basalt Units 2. Groundwater in Deep vs. Shallow Water-Bearing Zones is Connected 3. Groundwater & Surface Water are Connected: Seepage & Springs 4. Groundwater Pumping Causes Surface Water Depletion 5. Depletion Seasonal Magnitude & Duration Varies a. Depletion via Springs is More Acute than via Seepage b. Depletion is Less Acute with Distance c. Depletion is Less Acute with Greater Well Seal Depth 6. Depletion Total Volume Remains the Same Over Time

26 Water Resource Management Consideration 1. Recognize & Decide a. Recognize Total Depletion Volume Over Time Remains the Same b. Recognize Maximum Rate & Duration of Depletion Can Vary c. Decide What to Manage 2. Managing Acuteness of Depletion Rate & Duration a. Continuous Well Casing & Seal Through Basin-Fill Into Basalt b. Greater Distance Between Wells & Surface Water c. Avoid Depletion via Springs as Much as Possible 3. Managing Depletion Maximum Rate & Volume a. Determine Maximum Monthly Depletion Acceptable b. Determine Maximum Monthly GW Pumping Rate Acceptable c. Determine Maximum Annual GW Pumping Volume Acceptable

27 Thank You!!

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