May Zegzeg

It is a confined river, locally meandering in its narrow alluvial plain, with an average slope gradient of 43 metres per kilometre. With its tributaries May Sho'ate and May Harena, the river has cut a gorge.{{cite book |last1=Amanuel Zenebe |first1=and colleagues |title= The Giba, Tanqwa and Tsaliet rivers in the headwaters of the Tekezze basin. In: Geo-trekking in Ethiopia's Tropical Mountains - The Dogu'a Tembien District |date=2019 |publisher=SpringerNature |isbn=978-3-030-04954-6 |doi=10.1007/978-3-030-04955-3_14 }} Jointly with adjacent May Be’ati River, this river is the source of Rubaksa River.

File:Confluence MB MZZ.jpg and becomes Rubaksa River]]

Runoff mostly happens in the form of high runoff discharge events that occur in a very short period (called flash floods). These are related to the steep topography, often little vegetation cover and intense convective rainfall. The peaks of such flash floods have often a 50 to 100 times larger discharge than the preceding baseflow.

The magnitude of floods in this river has however been decreased due to interventions in the catchment. At Habdi Luqmuts and on other steep slopes, exclosures have been established; the dense vegetation largely contributes to enhanced infiltration, less flooding and better baseflow.{{cite journal |last1= Descheemaeker|first1= K. and colleagues| title= Runoff on slopes with restoring vegetation: A case study from the Tigray highlands, Ethiopia. |journal= Journal of Hydrology |date=2006 |volume=331 |issue=1–2 |pages=219–241 |doi= 10.1016/j.still.2006.07.011|url= https://biblio.ugent.be/publication/378900|hdl= 1854/LU-378900 |hdl-access= free }} Physical conservation structures such as stone bunds{{cite journal |last1= Nyssen|first1= Jan|last2= Poesen|first2= Jean|last3= Gebremichael|first3= Desta|last4= Vancampenhout|first4= Karen|last5= d'Aes|first5= Margo|last6= Yihdego|first6= Gebremedhin|last7= Govers|first7= Gerard|last8= Leirs|first8= Herwig|last9= Moeyersons|first9= Jan|last10= Naudts|first10= Jozef|last11= Haregeweyn|first11= Nigussie|last12= Haile|first12= Mitiku|last13= Deckers|first13= Jozef|title= Interdisciplinary on-site evaluation of stone bunds to control soil erosion on cropland in Northern Ethiopia. |journal= Soil and Tillage Research |date=2007 |volume=94 |issue=1 |pages=151–163 |doi= 10.1016/j.still.2006.07.011|hdl= 1854/LU-378900|url= https://biblio.ugent.be/publication/378900|hdl-access= free}}{{cite journal |last1= Gebeyehu Taye and colleagues| title= Evolution of the effectiveness of stone bunds and trenches in reducing runoff and soil loss in the semi-arid Ethiopian highlands. |journal= Zeitschrift für Geomorphologie|date=2015 |volume=59 |issue=4 |pages=477–493 |doi= 10.1127/zfg/2015/0166}} and check dams also intercept runoff.{{cite journal |last1= Nyssen|first1= J.|last2= Veyret-Picot|first2= M.|last3= Poesen|first3= J.|last4= Moeyersons|first4= J.|last5= Haile|first5= Mitiku|last6= Deckers|first6= J.|last7= Govers|first7= G.|title= The effectiveness of loose rock check dams for gully control in Tigray, Northern Ethiopia. |journal= Soil Use and Management |date=2004 |volume=20 |pages=55–64 |doi= 10.1111/j.1475-2743.2004.tb00337.x}}{{cite journal |last1= Etefa Guyassa and colleagues|title= Effects of check dams on runoff characteristics along gully reaches, the case of Northern Ethiopia. |journal= Journal of Hydrology |date=2017 |volume=545 |issue=1 |pages=299–309 |doi= 10.1016/j.jhydrol.2016.12.019|url= https://biblio.ugent.be/publication/8518957 |hdl= 1854/LU-8518957 |hdl-access= free }}

Boulders and pebbles encountered in the river bed can originate from any location higher up in the catchment, including the following lithological units:{{cite book |last1=Sembroni |first1=A. |last2=Molin |first2=P. |last3=Dramis |first3=F. |title=Regional geology of the Dogu'a Tembien massif. In: Geo-trekking in Ethiopia's Tropical Mountains — The Dogu'a Tembien District |date=2019 |publisher=SpringerNature |isbn=978-3-030-04954-6 |url=https://www.springer.com/gp/book/9783030049546}}

• Phonolite plugs
• Upper basalt
• Interbedded lacustrine deposits
• Lower basalt
• Amba Aradam Formation
• Antalo Limestone
• Quaternary freshwater tufa{{cite journal |last1=Moeyersons |first1=J. and colleagues |title=Age and backfill/overfill stratigraphy of two tufa dams, Tigray Highlands, Ethiopia: Evidence for Late Pleistocene and Holocene wet conditions. |journal=Palaeogeography, Palaeoclimatology, Palaeoecology |date=2006 |volume=230 |issue=1–2 |pages=162–178 |bibcode=2006PPP...230..165M |doi=10.1016/j.palaeo.2005.07.013 }}

As part of outreach accompanying research in Dogu'a Tembien, the May Zegzeg Integrated Catchment Management Project was set up in 2004 in the catchment of the May Zegzeg River by researchers in cooperation with ADCS, a local NGO. The project included the implementation of conservation techniques to increase water infiltration and conserve the soil. The objective was to improve the livelihood of the communities of Harena, Hech'i and Addi Qolqwal as well as to demonstrate and promote global catchment management in the district.{{cite book |last1=Reubens |first1=B. and colleagues | title= Research-based development projects in Dogu'a Tembien. In: Geo-trekking in Ethiopia's Tropical Mountains - The Dogu'a Tembien District |date=2019 |publisher=SpringerNature |isbn=978-3-030-04954-6 |url=https://www.springer.com/gp/book/9783030049546}} The results of the implementation of site-specific conservation techniques aimed at increasing water infiltration and conserving soil were particularly monitored in the headwaters at May Sho'ate: dry masonry stone bunds,{{cite journal |last1= Nyssen|first1= Jan|last2= Poesen|first2= Jean|last3= Gebremichael|first3= Desta|last4= Vancampenhout|first4= Karen|last5= d'Aes|first5= Margo|last6= Yihdego|first6= Gebremedhin|last7= Govers|first7= Gerard|last8= Leirs|first8= Herwig|last9= Moeyersons|first9= Jan|last10= Naudts|first10= Jozef|last11= Haregeweyn|first11= Nigussie|last12= Haile|first12= Mitiku|last13= Deckers|first13= Jozef|title= Interdisciplinary on-site evaluation of stone bunds to control soil erosion on cropland in Northern Ethiopia. |journal= Soil and Tillage Research |date=2007 |volume=94 |issue=1 |pages=151–163 |doi= 10.1016/j.still.2006.07.011|hdl= 1854/LU-378900|url= https://biblio.ugent.be/publication/378900|hdl-access= free}} check dams in gullies,{{cite journal |last1= Nyssen|first1= J.|last2= Veyret-Picot|first2= M.|last3= Poesen|first3= J.|last4= Moeyersons|first4= J.|last5= Haile|first5= Mitiku|last6= Deckers|first6= J.|last7= Govers|first7= G.|title= The effectiveness of loose rock check dams for gully control in Tigray, Northern Ethiopia. |journal= Soil Use and Management |date=2004 |volume=20 |pages=55–64 |doi= 10.1111/j.1475-2743.2004.tb00337.x}} and the set-aside of degraded rangelands which resulted in exclosures.{{cite journal |last1=Descheemaeker |first1=K. and colleagues |title= Sediment deposition and pedogenesis in exclosures in the Tigray Highlands, Ethiopia. |journal=Geoderma |date=2006 |volume=132 |issue= 3–4|pages=291–314 |doi=10.1016/j.geoderma.2005.04.027 }}

Over its full course, this river constitutes the border between Mika'el Abiy (at the west) and Ayninbirkekin municipalities (at the east)

Trekking routes have been established across and along this river.{{cite book |title=Description of trekking routes in Dogu'a Tembien. In: Geo-trekking in Ethiopia's Tropical Mountains - The Dogu'a Tembien District |series=GeoGuide |date=2019 |publisher=SpringerNature |doi=10.1007/978-3-030-04955-3 |isbn=978-3-030-04954-6 |s2cid=199294303 |url=https://www.springer.com/gp/book/9783030049546}} The tracks are not marked on the ground but can be followed using downloaded .GPX files.{{Cite web|url=https://www.openstreetmap.org/traces/tag/nyssen-jacob-frankl|title=Public GPS Traces tagged with nyssen-jacob-frankl}}

• Trek 12, runs parallel to the river on the eastern bank, from May Sho'ate to Rubaksa

In the rainy season, flash floods may occur and it is advised not to follow the river bed. {{cite book |chapter=Logistics for the Trekker in a Rural Mountain District of Northern Ethiopia|date=2019 |publisher=Springer-Nature |pages=537–556 |doi=10.1007/978-3-030-04955-3_37 |title=Geo-trekking in Ethiopia's Tropical Mountains |series=GeoGuide |last1=Nyssen |first1=Jan |isbn=978-3-030-04954-6 }}

• List of Ethiopian rivers

{{reflist}}

Category:Rivers of Ethiopia

Category:Dogu'a Tembien

Category:Tigray Region

Category:Nile basin