Sipping lemon-ginger tea on the cushions of our house's rooftop pavilion, I watch the first light spangle the leaves of the poplars along the village's irrigation stream, see lambs herded into a small willow-walled corral, a woman in a black robe and orange head scarf testing her lower back after filling her buckets.
In a few instances, large pieces of rock gypsum have been placed in the irrigation ditch to supply calcium to the irrigation stream.
In practice it is unusual to get more than 1 to 4 me/l dissolved Ca in the usual fast-moving irrigation stream.
Excessive runoff is frequently collected in a pond at the low side of the irrigated field and is pumped back up slope through a pipeline to be re-circulated into the irrigation stream.
The mountains receive abundant rainfall, and with intensive agriculture (upland rice, sorghum, corn [maize], cassava), including some irrigation from streams, Luguru lands can support upward of 800 people per square mile (300 per square kilometre) in some places.
In contrast, western study areas (CCYK and CNBR) are in more arid environments that rely on irrigation practices; streams had larger average drainage basins (443 652 km) and less average canopy cover (22 28%).
Each unit is considered with the processes of lateral inflow, point and non-point pollution loads, irrigation return flow, and stream-aquifer exchanges in the model.
Etymology: (Latin: Tamaris River, Spain) Note: Invasive weeds with deep roots, especially along streams, irrigation canals.
Invasive weeds with deep roots that lower water table, especially along streams, irrigation canals.
Irrigation utilizes ephemeral streams in mountain areas, permanent pools (gueltas), foggaras (inclined underground tunnels dug to tap dispersed groundwater in the beds of wadis), springs (ʿayn), and wells (biʾr).
