Changes

Water Portal / Rainwater Harvesting / Groundwater recharge / Contour trenches

2 bytes added, 23:20, 28 March 2012

→‎Construction, operations and maintenance

In order to efficiently capture runoff in a catchment through appropriately sized trenches, the following information and analysis is needed:

* Catchment area, gathered from topographical maps

* Detailed rainfall data (which is used to create a rainfall frequency analysis where precipitation level and probable recurrence interval). Using this data, the predicted runoff for a particular intensity of rainfall can be shown using the Soil Conservation Service (SCS) method, which is a simple way to calculate runoff in ungauged catchments. To calculate runoff, the following is needed: precipitation for a particular rainfall recurrence interval (e.g. 5 years), catchment area, soil characteristics, and land use in catchment. For a given recurrence interval, the total amount of runoff for the catchment can then be calculated.

* Soil infiltration rates based on physical soil investigations on site.

* Total trench capacity can then be determined that can store the runoff volume minus what would infiltrate in the trenches during the rainfall event.

• ← Older edit
• Newer edit →

Winona

Akvopedia-spade, akvouser, bureaucrat, emailconfirmed, staff, susana-working-group-1, susana-working-group-10, susana-working-group-11, susana-working-group-12, susana-working-group-2, susana-working-group-3, susana-working-group-4, susana-working-group-5, susana-working-group-6, susana-working-group-7, susana-working-group-8, susana-working-group-9, susana-working-group-susana-member, administrator, widget editor

30,949

edits