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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  ยด                                                            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

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