Geographical setting Topography Topographically, the district is divided into scattered highlands such as Got Ramogi and Usenge in Usigu division, Got Abiero and Sirafuongo in division, lowlands of Yala Swamp and Nyang’oma Uyoma Plains. These result into differences in relief, soils and land use. These features give rise to altitudes ranging between 1140m and 1400m above the sea level. Climatic conditions The district has a modified equatorial climate with strong influence from local relief and the Lake. Predominantly, the district has warm, dry and humid climate with mean annual rainfall ranging between 800-1600 mm on bi-modal rainfall pattern of long rains occurring between March and May and short rains occurring between October and November. Temperatures too vary with mean of 22.5ºC and evaporation varies between 2000 mm and 2200 mm annually.. Geology and soils. The geology of the area is made up of the old Nyanzian rock system made up of exposed volcanic rocks such as basalt, desite and ryolite. These rocks lead to the formation of black cotton loamy and red volcanic soils. Good fertile soils can be found in Ugunja, Ukwala, Yala, West Sakwa, South Nyang'oma and Usigu while relatively poor soils are in Karemo, Boro, Wagai, Uranga, North Sakwa, East and Central Yimbo. The district has various soil types as highlighted below; West Sakwa, and Usigu division have ferralsols South Nyang’oma North Sakwa, East and Central Yimbo have luvisols with low-moderate fertility Yala Swamp in Usigu division has gleysols, which are water logging, fertile andVariable Madiany division has fertile and moderately deep soils Phaeozeous Nyandiwa valley in South Asembo has valley soils of low fertility. Socio economic setting Demography Siaya County has a population size of about 842,304 according to the 2009 Population Census of which are 47% are males and 53% females living in 199,034 households. The county has a surface area of 2,530.38 sq km culminating to a population density of 333 people per km2. The population is young with 46.1 % being between ages 0 to 14 years, 50.9 % within 15-64 years and eventually 3.0 % are above 65 years.
Geographical setting Topography Topographically, the district is divided into scattered highlands such as Got Ramogi and Usenge in Usigu division, Got Abiero and Sirafuongo in Nyang’oma division, lowlands of Yala Swamp and Uyoma Plains. These result into differences in relief, soils and land use. These features give rise to altitudes ranging between 1140m and 1400m above the sea level. Climatic conditions The district has a modified equatorial climate with strong influence from local relief and the Lake. Predominantly, the district has warm, dry and humid climate with mean annual rainfall ranging between 800-1600 mm on bi-modal rainfall pattern of long rains occurring between March and May and short rains occurring between October and November. Temperatures too vary with mean of 22.5ºC and evaporation varies between 2000 mm and 2200 mm annually.. Geology and soils. The geology of the area is made up of the old Nyanzian rock system made up of exposed volcanic rocks such as basalt, desite and ryolite. These rocks lead to the formation of black cotton loamy and red volcanic soils. Good fertile soils can be found in Ugunja, Ukwala, Yala, West Sakwa, South Nyang'oma and Usigu while relatively poor soils are in Karemo, Boro, Wagai, Uranga, North Sakwa, East and Central Yimbo. The district has various soil types as highlighted below; West Sakwa, South Nyang’oma and Usigu division have ferralsols North Sakwa, East and Central Yimbo have luvisols with low-moderate fertility Yala Swamp in Usigu division has gleysols, which are water logging, fertile andVariable Madiany division has fertile and moderately deep Phaeozeous soils Nyandiwa valley in South Asembo has valley soils of low fertility. Socio economic setting Demography Siaya County has a population size of about 842,304 according to the 2009 Population Census of which are 47% are males and 53% females living in 199,034 households. The county has a surface area of 2,530.38 sq km culminating to a population density of 333 people per km2. The population is young with 46.1 % being between ages 0 to 14 years, 50.9 % within 15-64 years and eventually 3.0 % are above 65 years.