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Groundwater Quality: Tanzania

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Groundwater Quality: Tanzania Groundwater Quality: Tanzania This is one of a series of information sheets prepared for each country in which WaterAid works. The sheets aim to identify inorganic constituents of significant risk to health that may occur in groundwater in the country in question. The purpose of the sheets is to provide guidance to WaterAid Country Office staff on targeting efforts on water-quality testing and to encourage further thinking in the organisation on water- quality issues. Background comprises volcanic and intrusive rocks, largely of basaltic composition, but with some rare sodic Tanzania, located in east Africa, is bordered by alkaline rocks and igneous carbonates (e.g. Kenya, Uganda, Mozambique and the Indian Ocean Oldoinyo Lengai volcano). Some of the volcanic with a total land area of 945,000 sq. km (including centres are active (producing new lava and ash Mafia, Pemba and Zanzibar). The terrain consists of formations periodically) and associated with hot lowland plains along the coast, a central plateau springs. (1000-1500 m) and highlands over 2000 m in the north and south. Kilimanjaro, the highest mountain Some of the large lakes of Tanzania are ‘soda lakes’, in Africa, lies in north-eastern Tanzania with an which are highly alkaline (pH>8), sodium-rich lakes altitude of 5895 m. Lakes Tanganyika and Victoria associated with the volcanic activity. lie partially within Tanzania, along the western and northern borders respectively. Much of the south-eastern part of the country is composed of sedimentary rocks of various ages Climate varies from tropical in coastal areas to (Palaeozoic to Recent), including the Karroo temperate in the highlands and semi-arid in the Sandstone which extends from the coast at the central plateau. Annual rainfall ranges from 2500- Kenyan border south-westwards to Lake Nyasa. 3000 mm on the flanks of Mount Meru in the The sediments are mixed formations, including north, to 1000 mm at the coast, down to 550 mm in sandstones, mudstones and limestones. The Karroo the central plateau (Dodoma). Highest points in Sandstone includes some coal seams. northern Tanzania are snow-covered. Mean annual temperature in the Mount Meru area (north) is 19ºC The coastal plain consists of largely unconsolidated (range 12-28ºC), but increases to 26ºC at the coast. sediments (beach sands, dunes and salt marsh) together with some limestone deposits (Nkotagu, Tanzania’s economy is heavily dependent on 1989). agriculture (57% of GDP), although topography and climatic conditions limit the area of cultivated Unconsolidated recent sediments also infill land to just 4% of the total. Irrigated land area depressions in parts of the eroded crystalline amounts to just 1500 sq. km (1993 estimate). basement in central Tanzania. Geology Groundwater Availability The topographic variations in Tanzania are strongly In the crystalline basement of the central plateau, controlled by geology. The central plateau is groundwater flow is restricted to joints and composed of ancient crystalline basement rocks. fractures and is therefore limited. Groundwater is These are predominantly faulted and fractured potentially more abundant in the topmost part of metamorphic rocks with some granites. the basement which has been highly weathered in places and is hence friable and more permeable. The northern and southern highland regions are The thickness of the weathered layer (‘regolith’) is parts of the major East African Rift system which variable but in the Dodoma area averages around extends northwards through Kenya and Ethiopia, 50 m (Nkotagu, 1996). and which has developed over the last 30 million years through extreme crustal tension, rift faulting The water table in the region is typically shallow and and volcanic activity. The Gregory Rift (Figure 1) drinking water is abstracted from both hand-dug extends with a north-north-west trend through wells (<10 m) and deeper hand-pump tubewells. northern Tanzania and the Western Rift extends Groundwater resources are available in the Rift north-west to south-east along the south-western areas, and are used for potable supply. Hot springs margin of Tanzania. The geology of the Rift zones 1 30°E 32°E 34°E36°E38°E40°E Lake Victoria 0 km 200 2°S Lake 2°S Natron Mwanza T KILIMANJARO NGORONGORO F✲ MERU ✲ ✲ I Lake Eyasi R Arusha 4°S 4°S I YV R O N Tabora G E PembaD Is. R Tanga G I ° Zanzibar ° 6 S Dodoma A 6 S W E S N T E R Dar-es-Salaam Lake N Tanganyika R Lake O I ° F Rukwa 8 S T ° C 8 S Mafia Is. Mbeya E Faults Njombe A ✲ Volcanoes N ° Cenozoic - Recent sediments 10 S L ° a 10 S Rift Valley volcanics k e Palaeozoic - Mesozoic rocks N (includes Karroo Sandstone) y a Songea s Precambrian formations, a crystalline basement, including granite 30°E 32°E 34°E36°E38°E40°E Figure 1. Simplified geological map of Tanzania also occur, and can affect groundwater chemistry Groundwaters from the ancient crystalline considerably. basement of central Tanzania also typically have high alkalinity and relatively high sodium Groundwater in the coastal sedimentary aquifer concentrations and with slightly acidic to highly typically lies at shallow depth (<10 m) and alkaline pH values (6.1 to 9.1; Nkotagu, 1996). groundwater abstraction is apparently largely from Salinities vary but can be high with total-dissolved shallow hand-dug wells (Nkotagu, 1989). solids between 1000 and 3000 mg/l. Groundwater Quality Groundwaters from the recent sediments in the coastal plain are vulnerable to marine intrusion, Overview particularly where groundwater-pumping rates are high. Evidence of marine intrusion has been found Groundwater quality is controlled largely by in the coastal aquifer of the Kigamboni Peninsula geology. Groundwaters in the Rift zone of the (Dar Es Salaam) with elevated chloride, sulphate north are typically alkaline and soft (low calcium and sodium concentrations and with total-dissolved and magnesium concentrations) with high pH solids up to 1700 mg/l (Nkotagu, 1989). values and relatively high sodium concentrations. Some are saline, although groundwaters around the Little information is available for groundwater extinct volcano, Mount Meru, are reported to be quality in the sedimentary aquifers from the south- generally fresh (total-dissolved solids usually less eastern part of Tanzania. than 1000 mg/l; Issar, 1978). 2 In groundwaters from both the volcanic terrains in parts. Severe cases have been reported in Kitefu and crystalline basement rocks in the central village, east of Arusha (Nanyaro et al., 1984). plateau, fluoride concentrations are known to be high and consequently far more information is Fluorine-rich minerals are abundant in the lavas, available for fluoride than for other trace elements intrusions and ashes of the Rift zone, and of health significance. concentrations are much higher than in similar rock types elsewhere in the world (Kilham and Hecky, 1973). In addition, fine-grained ash deposits present Fluoride in the Rift are readily leachable. Hot springs are also Of the reported groundwater-quality problems in important sources and account for some of the Tanzania, fluoride is by far the most severe and most extreme concentrations observed in the widespread. It represents a major problem for water groundwaters of the northern Rift zone. Some supply nationally. The problem occurs in both the concentration of fluoride in groundwaters from the Rift zones in northern and south-western Tanzania, major depressions also appears to have occurred associated with volcanic activity, and in the through extreme evaporation of lake water and crystalline basement complex of the central plateau. subsequent infiltration to the shallow aquifers. Concentrations as high as several tens to hundreds Fluoride build-up in groundwaters from the of milligrams per litre have been reported for some crystalline basement of the central plateau derives groundwaters and high concentrations have also by dissolution of fluorine minerals (e.g. fluorite, been found in some rivers, soda lakes and hot apatite) and is facilitated by relatively low dissolved springs in the Rift zones. Nanyaro et al. (1984) calcium concentrations. reported concentrations of various water sources in Concentrations in groundwaters from the coastal northern Tanzania: plain appear to be low. Nkotagu (1989) quoted rivers: 12-26 mg/l; values in the range 0.002 to 0.38 mg/l. springs: 15-63 mg/l; alkaline lakes: 60-690 mg/l. Iron and manganese Bugaisa (1971) identified particular fluoride Iron and manganese data are not reported in many problems in groundwaters from: published water-quality investigations. Their distribution is therefore not well known. Nkotagu i) Shinyanga/Tabora region: (1989) reported iron values up to 1 mg/l in • Isanga Basin; groundwaters from the coastal aquifer of the • Seke (21-250 mg/l); Kigamboni Peninsula, although it is not clear • Wembere Depression (7-40 mg/l); whether these were dissolved (filtered) conc- ii) Dodoma/Singida region: entrations or whether they included particulate • Bahi depression (up to 180 mg/l); matter (unfiltered samples). It is therefore uncertain • Kongwa (up to 90 mg/l); whether they are representative of true groundwater • Kondoa (4-7 mg/l, up to 80 mg/l); compositions. iii) Arusha/Kilimanjaro region: Since few data have been reported for iron and • Sanya Corridor (up to 170 mg/l; 4-8 mg/l manganese and since they are readily detectable by further north); taste and appearance if present in significant • Ngorogoro Crater and Lemagrut volcanic amounts, they are assumed not to represent a cone; serious regional water-quality problem. • Serengeti (up to 150 mg/l); • Ol Balbal Depression (over 86 mg/l); Nitrate • Mbulu District (up to 99 mg/l); The distribution of nitrate in groundwaters • Lake Natron Basin (up to 330 mg/l); nationally is not known. However, some high iv) Musoma region; concentrations (0.002 mg/l to 102 mg/l as N, mean v) Mbeya region: • value 34 mg/l) have been reported in both shallow Rukwa Depression (up to 75 mg/l).
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