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Infiltration Test Results

A B C

A. YVWD hydrant setup at
Oakwood Circle
B. 4" fire hose above test site
C. Setting up flow control skid
in excavation prior to filling;
two float valves on 2"
discharge lines and high
and low water level alarm
sensors
D. Initial fill of test basin (Day 1)
E. Consistent silt with fine to
medium sand (0-5 feet)

D E

Test Start Jul-09-2018
Conclusions:
Test End Jul-23-2018 YVWD Hydrant - Results of infiltration testing indicate that the site is suitable for recharge.
Basin Dimensions (L x W) (ft) 32 x 30 - Full-scale basin initial infiltration rates (based on 50% of measured field-scale testing infiltration
Average Water Height (ft) 2.5 rates) are estimated at 5.4 feet/day. Long-term infiltration rates (based on 50% of full-scale basin
initial infiltration rates) are estimated at 2.7 feet/day. While long-term estimates consider
2
Infiltrating Area Basin Bottom (ft ) 960 Tennessee Street Basin expected clogging of the basin bottom from SWP water, actual long-term rates will be
2
Infiltrating Area Basin Bottom + Walls (ft ) 1,270 Test Site dependent on the specific site recharge goal and implementation of a basin maintenance plan.
Total Water Added (gallons) 871,782
Total Water Added (acre-feet) 2.7 " ) Recommendations:
- Depending on size of a full-scale recharge project, pilot scale infiltration test is recommended to
High (ft/d) 12.3 identify potential site vadose zone storage capacity constraints due to recharge mounding.
Infiltration Rate - Pilot testing combined with installation of monitoring wells north and south of the Western
Low (ft/d) 9.2
(Constant-Head) Heights Fault is recommended to confirm groundwater storage benefits from recharge at this location.
Average (ft/d) 10.8
Infiltration Rate High (ft/d) 11.1
(Falling-Head) Low (ft/d) 9.5 ´ Figure 2
Full-Scale Basin Est. Initial Infiltration Rate (ft/d) 5.4 0 800 Feet Tennessee Street
Full-Scale Basin Est. Long-Term Infiltration Rate (ft/d) 2.7 Basin

Yucaipa Sustainable Groundwater Management Agency - January 23, 2019 - Page 46 of 137