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water management

  1. M

    Water from rivers

    This is an easy way to use the flowing river to extract water e.g. for irrigation. Michael
  2. Asher Kelman

    Administrative: Changes to OPF

    As you have no doubt noticed I am pulling together what has been true of OPF: we are passionate about life on the planet, diverse and colorful societies and the challenges we face. We express these values with our photography. I am just gathering together broad subjects that reflect who we...