African Wildlife & Environment Issue 80

HYDROZONING

A hydrozone in a landscape refers to each section of the landscape that is watered using the same valve i.e. the hydrozone (hydrostation) in question is watered as a unit. Hence, each area in a landscape or garden that is individually watered must be assessed separately Zone into high/medium/ low/very low water use areas

HIGH ZONE • This should be nomore than 10 - 30%of the landscape. • Plant water-loving annuals/plants in selected high water use areas e.g. entrances, entertainment areas, containers and focal points. • Avoid long winding borders of colour - impractical towater. • Use colour in containers. MEDIUMZONE • This should make up between 20% and 40% of the landscape. • Can incorprate the bulk of the garden or landscape. • Consists mainly of shrubs, perennials, ground cover and lawn. LOWZONE • Makes up between 30%and 60%of the landscape. • Is the backbone of the design. • Is mainly trees, large shrubs, limited small Mediterranean type shrubs, succulents and aloes.

VERY LOWZONE • This should make up between 40% and 100% of the landscape. • Consists of mainly locally indigenous trees, shrubs and other plants. • Permeablepaving rather thansolid nonpermeablepaving should be used in this zone. The proportions of landscapes or gardens allocated to each zone is based on the principle that sites should be landscaped by considering certain maximum areas of the site allocated to different hydrozones. This isusedmerely asaguide; however, it isbelievedthatbecauseSouthAfricaisawaterstressedcountry that the areas allocated to highhydrozones shouldbeminimal.

If a landscape doesn’t have high and/or mediumhydrozones then a greater area should be allocated to other lower water hydrozones.

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60 | African Wildlife & Environment | Issue 80 (2021)