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Open AccessArticle

The Effect of Soil Tillage Equipment on the Recharge Capacity of Infiltration Ponds

1
Mekorot, National Water Company, Tel Aviv PO 20128, Israel
2
Plagey Maim, Megido, Israel
*
Author to whom correspondence should be addressed.
Water 2020, 12(2), 541; https://doi.org/10.3390/w12020541
Received: 19 November 2019 / Revised: 5 January 2020 / Accepted: 13 February 2020 / Published: 15 February 2020
(This article belongs to the Special Issue Managed Aquifer Recharge for Water Resilience)
The Dan Region Reclamation Project (Shafdan) reclaims ~125 millions of cubic meters per year (Mm3/year) of treated wastewater from the Tel Aviv Metropolitan area. Following secondary treatment, the effluent is recharged into a sandy aquifer for soil aquifer treatment (SAT). Over the past three years, a decrease in recharge capacity was noticed. Several operational causes were considered including reservations regarding the tillage procedure of recharge ponds. Tillage of the recharge ponds facilitates aeration, breaking surface crusts and the removal of vegetation. The procedure includes deep (40–60 cm) plowing and shallow (10–20 cm) sweep-knives (SK) cultivator or discus. In this research, the existing tillage equipment was compared to a new equipment, which includes a deep subsoiler and a chisel-knives (CK) cultivator. The effects of each tool on the infiltration rate (IR), recharge capacity, and soil compaction were examined. The results suggest a significant improvement in the recharge capacity, up to 95% and 15% on average following subsoiler and CK cultivator treatments, respectively, with respect to the existing plowing treatment. In addition, the depth of the compacted soil layer increased from ~30 to ~55 cm after subsoiler treatment. It seems that this shallow layer, developed under an improper tillage regime, played a major role in the reduction of the recharge capacity. Essential understanding of other operational factors such as drying periods, preparation of the field, and soil micro-topography was also achieved. View Full-Text
Keywords: SAT; tillage; infiltration pond; infiltration rate; soil compaction SAT; tillage; infiltration pond; infiltration rate; soil compaction
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Negev, I.; Shechter, T.; Shtrasler, L.; Rozenbach, H.; Livne, A. The Effect of Soil Tillage Equipment on the Recharge Capacity of Infiltration Ponds. Water 2020, 12, 541.

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