Efficiency of non-structural flood mitigation measures: “room for the river” and “retaining water in the landscape. Final report. First CRUE ERA-Net Common Call Effectiveness and Efficiency of Non-structural Flood Risk Management Measures. CRUE Flooding ERA-NET (http://www.crue-eranet.net/partner_area/documents/Room_for_the_River_final_report.pdf)
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Let the grass grow higher and thus encourage root growth. It will also allow the grass to self-seed. If you mow a path in the middle, it will show that it is indeed meant to be that way as opposed to being neglected.
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