Page 61 - Yucaipa Sustainable Groundwater Management Agency - Yucaipa SGMA

Infiltration Test Results

A B

E

A. SMWC fire hydrant setup
B. 4" fire hose and traffic barricades
C. Post-excavation / flow control skid setup
D. Test in progress (Day 1)
C C D E. Test in progress (Day 7)

DRY SOIL (SILT)
10-12 FEET BELOW
CHANNEL BOTTOM

Test Start Aug-20-2018 Conclusions:
Test End Sep-03-2018 - Results of infiltration testing confirm/indicate that the site is favorable for recharge.
- Full-scale basin initial infiltration rates (based on 50% of measured field-scale testing infiltration
Basin Dimensions (L x W) (ft) 33 x 32 rates) are estimated at 8.0 feet/day. Long-term infiltration rates (based on 50% of full-scale basin initial
Average Water Height (ft) 3.0 infiltration rates) are estimated at 4.0 feet/day.
2
Infiltrating Area Basin Bottom (ft ) 960 - While long-term estimates consider expected clogging of the basin bottom from SWP water,
actual long-term rates will be dependent on the specific site recharge goal and implementation
2
Infiltrating Area Basin Bottom + Walls (ft ) 1,270 of a basin maintenance plan.
City of Yucaipa
Total Water Added (gallons) 1,646,180 - High infiltration rates are representative of almost exclusively coarse-grained deposits (sand/gravel)
YVWD at California Street identified in EX-5.
Total Water Added (acre-feet) 5.1 Hydrant Test Site
High (ft/d) 18.47 " ) Recommendations:
Infiltration Rate
Low (ft/d) 13.58 X YBoring EX-5 - Pilot recharge testing is recommended to confirm full-scale basin infiltration rates and identify
(Constant-Head) potential site vadose zone storage capacity constraints due to recharge mounding.
Average (ft/d) 16.0
Infiltration Rate High (ft/d) 16.82 USGS Nested Well
(Falling-Head) Low (ft/d) 14.5 ´ 0 400 Feet (Equestrian Park) Figure 8
Full-Scale Basin Est. Initial Infiltration Rate (ft/d) 8.0 City of Yucaipa
Full-Scale Basin Est. Long-Term Infiltration Rate (ft/d) 4.0 at California Street

Yucaipa Sustainable Groundwater Management Agency - January 23, 2019 - Page 52 of 137