In recent years, the river has suffered from industrial pollution, agricultural run-off, siltation, and loss of wetland and lakes, which exacerbates seasonal flooding.
en.wikipedia.org Poorly sourced coco peat can have excess salts in it and needs washing (check electrical conductivity of run-off water, flush if high).
en.wikipedia.org Because of seepage into the ground, in addition to the run-off from a watershed of about, the lake is supplied by pumping from springs.
en.wikipedia.org Plants whose natural requirements are appropriate to the local climate are emphasized, and care is taken to avoid losing water to evaporation and run-off.
en.wikipedia.org Land run-off and industrial, agricultural, and domestic waste enter rivers and are discharged into estuaries.
en.wikipedia.org