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Infiltration Test Results

A B

F

D A. YVWD hydrant setup on Chapman Heights Road
B. 4" fire hose elbow south of Chapman Heights Rd
C. 4" fire hose in culvert north of Chapman Heights Rd
D. Testing in progress (Day 1)
E. Testing in progress (Day 1)
F. Test in progress (from western bank) (Day 7)

C E

Test Start Jul-23-2018 Conclusions:
Test End Aug-06-2018 Western Heights Fault - Results of infiltration testing indicate that the site is suitable for recharge.
Basin Dimensions (L x W) (ft) 37 x 33 Chapman Heights Basin - Full-scale basin initial infiltration rates (based on 50% of measured field-scale testing infiltration
" ) Test Site rates) are estimated at 5.1 feet/day. Long-term infiltration rates (based on 50% of full-scale basin
Average Water Height (ft) 2.5
initial infiltration rates) are estimated at 2.5 feet/day. While long-term estimates consider
2
Infiltrating Area Basin Bottom (ft ) 960 expected clogging of the basin bottom from SWP water, actual long-term rates will be
2
Infiltrating Area Basin Bottom + Walls (ft ) 1,270 dependent on the specific site recharge goal and implementation of a basin maintenance plan.
Total Water Added (gallons) 974,084 Recommendations:
Total Water Added (acre-feet) 3.0 - Depending on size of a full-scale recharge project, pilot scale infiltration test is recommended to
Hydrant
High (ft/d) 11.5 identify potential site vadose zone storage capacity constraints due to recharge mounding.
Infiltration Rate Western Heights Fault - Pilot testing combined with installation of monitoring wells north and south of the Western
Low (ft/d) 8.8
(Constant-Head) Heights Fault is recommended to confirm groundwater storage benefits from managed
Average (ft/d) 10.2 aquifer recharge at this location.
Infiltration Rate High (ft/d) 9.5
(Falling-Head) Low (ft/d) 7.25 ´ Figure 4
Full-Scale Basin Est. Initial Infiltration Rate (ft/d) 5.1 0 400 Feet Chapman Heights
Full-Scale Basin Est. Long-Term Infiltration Rate (ft/d) 2.5 Basin

Yucaipa Sustainable Groundwater Management Agency - January 23, 2019 - Page 48 of 137