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A Journey of Exile and Hope: Building a New Life in Switzerland is a personal memoir of exile, survival, resilience, and renewal. Mesfin Hagos Tewolde shares his journey from hardship and uncertainty to the long process of rebuilding life in Switzerland. The book reflects on the experience of leaving behind a homeland shaped by fear, restriction, and political pressure, and entering a new country where safety, education, dignity, and personal growth became possible. Through his story, the author explores the emotional reality of refugee life, the challenge of starting again, and the hope that can emerge even after deep loss. This memoir is also a reflection on identity, belonging, gratitude, and the courage required to continue moving forward. It offers readers a human account of displacement, endurance, and the search for a meaningful future in a new land.

An air release valve is used in irrigation pipelines to automatically remove trapped air from the system. It helps improve water flow, reduce air blockage, protect pipes from pressure surges, and support stable operation in drip, sprinkler, and pressurized irrigation networks.

Automatic air release valve for drip and sprinkler irrigation systems. It removes trapped air from pipelines, improves water flow, protects pipes and fittings, reduces air locks, and supports stable irrigation performance.

A ball valve is a simple and reliable quarter-turn valve used to quickly start or stop water flow in irrigation systems. It ensures full flow when open and complete shut-off when closed, making it essential for control in drip, sprinkler, pump, and fertigation systems.

High-volume big gun sprinkler for long-distance irrigation over large fields, pastures, forage crops, open farm areas, and demanding agricultural conditions. Designed for powerful water coverage, strong flow, and wide-area irrigation performance.

A button dripper is a small point-source drip irrigation emitter used to deliver a controlled amount of water directly to individual plants. It is installed into a PE lateral pipe and helps irrigate trees, seedlings, nursery bags, greenhouses, gardens, and orchards with efficient root-zone watering.

A check valve, also called a non-return valve, allows water to flow in one direction only and automatically blocks reverse flow. It protects pumps, filters, pressure regulators, fertilizer injectors, and the water source from backflow, back-siphonage, reverse pressure, and possible contamination. It is commonly installed after pumps, near fertigation units, near filter-regulator assemblies, or on drip irrigation mainlines.

De l’Expendable à l’Évadé : Un Voyage de Survie est un récit personnel de Mesfin Hagos Tewolde sur la survie, l’exil, l’identité et la recherche de liberté. À travers son parcours entre l’Éthiopie, l’Érythrée et la vie de réfugié, l’auteur raconte comment les bouleversements politiques, la discrimination, la pression militaire et l’incertitude ont marqué sa vie. Ce livre présente une expérience humaine profonde : celle d’un homme confronté à la peur, à la perte, à la séparation et au besoin de fuir pour préserver sa dignité et son avenir. Mais au-delà de la souffrance, le récit porte aussi un message de courage, de résilience et d’espoir. En retraçant son évasion du service militaire érythréen et son chemin difficile vers la sécurité, Mesfin invite le lecteur à réfléchir sur la liberté, la justice, l’appartenance, la famille et la force intérieure nécessaire pour survivre aux épreuves. Ce mémoire offre également une réflexion critique sur l’Érythrée après l’indépendance, sur les espoirs brisés d’un peuple et sur la nécessité d’une véritable liberté humaine. C’est un livre destiné aux lecteurs intéressés par les récits de réfugiés, l’histoire de l’Érythrée et de l’Éthiopie, les droits humains, l’exil et la puissance de l’esprit humain face à l’adversité.

A disc filter is an essential drip irrigation filtration device used to trap sand, sediment, and small particles before they enter the irrigation lines. It helps protect drip tape, drip pipes, emitters, and micro-sprinklers from clogging, supporting better water flow and longer system life.

Uniform flow drip emitter for precise water delivery directly to plant root zones under varying pressure conditions.

Drip tape is a flexible thin-wall irrigation tube designed to release water directly near crop roots through small built-in emitters. It is ideal for vegetables, row crops, greenhouses, nurseries, and smallholder farms.

A drip tape coupling connector is used to join two sections of flat drip tape in a straight line. It helps repair damaged drip tape, extend irrigation lines, and maintain continuous water flow. It provides a simple, leak-resistant connection and should be used only with matching flat drip tape sizes, not thick round HDPE mainline pipe.

A drip tape elbow connector is used to join two sections of flat drip tape at a 90° angle. It helps change the direction of a drip irrigation line without bending or damaging the tape. It provides a secure, leak-resistant connection and is useful for field corners, greenhouse layouts, nurseries, gardens, and row-crop drip systems.

A drip tape tee connector is used to create a 3-way branch connection in a flat drip tape irrigation system. It divides one drip tape line into two directions, helping distribute water to different rows or sections. It is simple, leak-resistant, easy to install, and should be used only with matching flat drip tape sizes, not thick round HDPE pipe.

A drip tape valve connector is used to connect drip tape and control water flow to individual irrigation lines. It allows one drip tape row to be opened, closed, or isolated without stopping the whole system. It is useful for water saving, maintenance, row-by-row irrigation control, and leak-resistant drip tape installation.

Este estudo analisa a aplicação dos métodos baseados em Muskingum para o encaminhamento de cheias em troços de rios não medidos, onde os dados de níveis de água ou caudais são limitados ou inexistentes. A investigação avalia especialmente o método Muskingum-Cunge, considerando também os caudais laterais e as características físicas dos cursos de água. Os parâmetros do modelo são calibrados com dados observados, modelos digitais de elevação e equações empíricas. Com base em três sub-bacias da bacia hidrográfica do Thukela, na África do Sul, o estudo demonstra que o método Muskingum-Cunge calibrado pode produzir hidrogramas de escoamento precisos e estimativas fiáveis do comportamento das cheias. O livro conclui que o método Muskingum-Cunge é eficaz para o encaminhamento de cheias na bacia do Thukela e pode ser aplicado a outros rios não medidos na África do Sul.

An end cap, also called a line end closure or end plug, is used to close the open end of a drip irrigation pipe or lateral line. It prevents water leakage, maintains system pressure, protects the line from dirt and insects, and helps the drip emitters work properly. It is simple, durable, and essential for completing a drip irrigation line.

A fertilizer tank, also called a fertigation tank, is used to prepare and hold dissolved fertilizer solution before it is injected into an irrigation system. It works with a Venturi injector or dosing pump to mix nutrients with irrigation water and deliver them to crops through drip or sprinkler systems. It improves fertilizer application, saves labor, supports uniform nutrient distribution, and helps modern irrigation management.

Fixed spray head for precise watering in lawns, gardens, flower beds, borders, and small irrigation zones. It delivers a steady spray pattern for simple, reliable, and uniform water distribution.

Flood routing is a crucial process in hydraulic engineering, particularly for designing flood protection measures and predicting flood wave propagation in river systems. In many regions, river reaches are ungauged, making it challenging to estimate the stages or flow rates required for planning and evaluating hydraulic structures. This book provides a comprehensive study of the Muskingum-based methods for flood routing in ungauged catchments, focusing on their application and performance. The book examines the use of the Muskingum-Cunge method, a modification of the traditional Muskingum method, for flow routing in river reaches that lack direct inflow or outflow measurements. The authors explore various models for gauged catchments and derive parameters that can be applied to ungauged areas. Key variables such as slope, reach width, reach length, and channel geometry are considered for model development. Three sub-catchments in the Thukela catchment in KwaZulu-Natal, South Africa, serve as case studies for applying the Muskingum-Cunge method and other related methods. The book discusses data collection techniques, model calibration using observed data, and sensitivity analyses to identify key variables influencing flood routing accuracy. The results demonstrate that the Muskingum-Cunge method can effectively route floods in ungauged catchments with reasonably accurate predictions regarding peak discharge, timing, and volume. This book is an essential resource for hydrologists, civil engineers, and environmental scientists engaged in flood risk management, river engineering, and water resource management. It offers practical insights and methodologies for applying flood routing techniques in regions where river flow data is scarce or unavailable.

A flush valve is an end-line irrigation component used to remove dirt, sand, and sediment from drip lines and submain pipelines. It helps maintain clean water flow, reduces clogging of emitters, and improves the overall efficiency and lifespan of the irrigation system.

From Expendable to Escaped: A Journey of Survival is a powerful memoir of endurance, displacement, and the search for freedom. Mesfin Hagos Tewolde recounts his life across Ethiopia, Eritrea, and exile, revealing how political turmoil, identity struggles, military pressure, and refugee life shaped his journey. Born into a region marked by conflict and uncertainty, Mesfin grew up witnessing major historical changes, from the fall of Emperor Haile Selassie to the rise of military rule and the deepening tensions between Eritrea and Ethiopia. His personal story reflects the experience of many people caught between nationality, politics, fear, and survival. The book follows his escape from forced military service, his difficult path as a refugee, and the emotional burden of leaving behind home, family, and familiar life. Yet the story is not only about suffering. It is also about courage, faith, determination, and the human ability to rebuild hope even after great loss. Through his personal testimony, Mesfin also reflects on leadership, justice, freedom, and the painful realities faced by Eritreans after independence. This memoir gives readers a human view of history, showing how political decisions affect ordinary lives. From Expendable to Escaped is a moving account for readers interested in refugee experiences, African political history, human resilience, and personal stories of survival against overwhelming circumstances.

A gear-drive sprinkler provides smooth, steady, rotating water application for lawns, parks, sports fields, gardens, and larger landscaped areas. It gives uniform coverage with controlled spray movement.

HDPE pipe is a strong and flexible irrigation pipe used as a mainline or submain to carry water from the pump, tank, filter station, or control head to the field. It is widely used in drip irrigation, sprinkler systems, farm water distribution, and pump delivery lines because it is durable, pressure-resistant, and suitable for outdoor irrigation networks.

Dieses Buch untersucht den Einsatz von Muskingum-basierten Methoden für das Hochwasserrouting in ungemessenen Flussabschnitten, in denen Wasserstände oder Durchflussdaten nur begrenzt oder gar nicht verfügbar sind. Solche Informationen sind jedoch entscheidend für die Planung und Bewertung wasserbaulicher Anlagen sowie für den Hochwasserschutz. Im Mittelpunkt steht die Muskingum-Cunge-Methode, die anhand beobachteter Daten kalibriert und für ungauged beziehungsweise ungemessene Flussabschnitte bewertet wird. Dabei werden auch seitliche Zuflüsse, digitale Höhenmodelle und empirische Gleichungen berücksichtigt. Anhand von drei Teileinzugsgebieten im Thukela-Einzugsgebiet in Südafrika zeigt die Studie, dass die kalibrierte Muskingum-Cunge-Methode zuverlässige Abflussganglinien liefern kann. Die Ergebnisse bestätigen ihre Eignung für das Hochwasserrouting in ungauged Einzugsgebieten und zeigen, dass sie auch auf andere ungauged Flüsse in Südafrika übertragen werden kann.

Questo studio analizza l’utilizzo dei metodi basati sul modello di Muskingum per l’instradamento delle piene nei corsi d’acqua non misurati, dove i dati sui livelli idrici o sulle portate sono limitati o assenti. L’opera esamina in particolare il metodo Muskingum-Cunge, considerando anche gli afflussi laterali e le caratteristiche fisiche dei corsi d’acqua. I parametri del modello vengono calibrati utilizzando dati osservati, modelli digitali di elevazione ed equazioni empiriche. Attraverso l’analisi di tre sottobacini del bacino idrografico del Thukela, in Sudafrica, lo studio dimostra che il metodo Muskingum-Cunge calibrato può produrre idrogrammi di deflusso accurati e fornire stime affidabili del comportamento delle piene. Il libro conclude che il metodo Muskingum-Cunge è efficace per l’instradamento delle piene nel bacino del Thukela e può essere applicato anche ad altri fiumi non misurati in Sudafrica.

Durable impact sprinkler for broad field irrigation and dependable outdoor watering. It distributes water in a circular or part-circle pattern and is suitable for open fields, vegetables, gardens, pastures, orchards, nurseries, and farm irrigation systems.

Produced by irrigation equipment, water-meter, and flow-measurement manufacturers. Common producers include irrigation and water-control companies that manufacture mechanical turbine meters, paddle-wheel meters, electromagnetic meters, and ultrasonic flow meters. The exact manufacturer depends on meter type, pipe size, flow range, pressure rating, and connection type.

A smart irrigation timer is an automatic control device that opens and closes water flow at scheduled times, enabling efficient and hands-free operation of drip irrigation, sprinkler systems, gardens, greenhouses, and small farms.

A lateral pipe (dripline) is the final irrigation line that delivers water directly from the submain to the plant root zone through built-in emitters. It ensures controlled, uniform, and efficient water application in drip irrigation systems.

A micro-sprinkler provides gentle, low-pressure irrigation for trees, vegetables, nurseries, and garden crops. It sprays water evenly around the plant root zone and is easy to connect with micro-tube or pipe fittings.

A micro tube stake / holder secures a 4 mm micro tube near the plant and directs water exactly to the root zone. It prevents tube movement, improves irrigation precision, reduces water waste, and is ideal for nurseries, greenhouses, orchards, gardens, landscaping, and potted plants.

Retractable pop-up sprinkler designed for lawns and landscaped areas. It rises during watering and retracts when the system stops, helping maintain a neat appearance, protect the sprinkler head, and provide reliable irrigation coverage.

A pressure gauge is a monitoring instrument used in irrigation systems to measure real-time water pressure in pipelines, pumps, filters, and regulators, helping ensure safe and efficient operation of drip and sprinkler irrigation systems.

A pressure regulator is used in drip irrigation systems to control and stabilize water pressure before it reaches drip tape, drip pipes, and emitters. It helps prevent bursting, leakage, and uneven water discharge, making the irrigation system safer and more uniform.

A punch tool is used to make clean, accurate holes in PE or HDPE drip irrigation pipes for installing take-off connectors, start connectors, rubber grommets, button drippers, and micro-tube connectors. It helps prevent leakage, improves fitting installation, saves time, and gives a professional drip irrigation connection.

Rotary sprinkler designed to distribute water through rotating streams for uniform irrigation coverage. Suitable for lawns, gardens, parks, nurseries, landscaped areas, and medium-size irrigation zones.

Cette étude porte sur l’utilisation des méthodes basées sur le modèle de Muskingum pour le routage des crues dans les tronçons de rivière non jaugés, où les données de niveau d’eau ou de débit sont limitées. Elle évalue notamment la méthode Muskingum-Cunge, en tenant compte des apports latéraux et des caractéristiques physiques des cours d’eau. À partir de trois sous-bassins du bassin de la Thukela en Afrique du Sud, l’étude utilise des données observées, des modèles numériques d’élévation et des équations empiriques pour calibrer et tester les modèles. Les résultats montrent que la méthode Muskingum-Cunge calibrée permet de produire des hydrogrammes relativement précis et peut être appliquée efficacement aux bassins versants non jaugés. L’étude conclut que cette méthode constitue un outil utile pour l’estimation des crues dans le bassin de la Thukela et qu’elle peut également être adaptée à d’autres rivières non jaugées en Afrique du Sud.

A grommet or rubber seal is a flexible sealing component used to create a tight, leak-proof connection where a fitting or pipe passes through a pipe wall, tank, barrel, or panel. It protects the opening, reduces friction, and helps ensure secure installation in drip irrigation and water supply systems.

A sand / media filter removes sand, silt, algae, organic matter, and suspended particles from irrigation water. It protects drip emitters, valves, pressure regulators, and fertigation equipment from clogging and damage. During normal filtration, dirty water passes through the media bed and clean water exits to the irrigation system. During backwash, water flows upward through the media to remove trapped dirt through the waste outlet.

A soil moisture sensor measures the water condition in the crop root zone and helps decide when irrigation is needed. It supports smart drip irrigation, prevents over-watering and under-watering, saves water, improves crop health, and can be connected to controllers, timers, solenoid valves, or smart irrigation systems.

A solenoid valve is an electrically controlled valve used to automatically open and close water flow in a drip irrigation system. It receives a signal from an irrigation controller or timer and allows water to flow to a selected irrigation zone. When the signal stops, the valve closes and stops the water flow.

A take-off connector is used to take water from a main irrigation pipe and deliver it to a smaller drip lateral, micro tube, extension tube, or plant delivery line. It is installed into a clean punched hole on the main pipe and creates a secure, leak-resistant outlet for drip irrigation branches.

Este estudio analiza la aplicación de los métodos basados en Muskingum para el trazado o enrutamiento de avenidas en tramos fluviales no aforados, donde los datos de niveles de agua o caudales son limitados o inexistentes. La investigación se centra especialmente en el método Muskingum-Cunge, considerando también las entradas laterales y las características físicas de los ríos. Los parámetros del modelo se calibran utilizando datos observados, modelos digitales de elevación y ecuaciones empíricas. A partir de tres subcuencas de la cuenca del Thukela, en Sudáfrica, el estudio demuestra que el método Muskingum-Cunge calibrado puede generar hidrogramas de desagüe precisos y estimaciones fiables del comportamiento de las avenidas. El libro concluye que el método Muskingum-Cunge es eficaz para el trazado de avenidas en la cuenca del Thukela y puede aplicarse también a otros ríos no aforados de Sudáfrica.

Twenty Winters in Silence: Life on Hold is a reflective book about living for many years in safety, yet feeling emotionally, professionally, and socially suspended. Based on lived experience, it explores the hidden weight of prolonged uncertainty, temporary status, administrative hesitation, and the difficulty of rebuilding a full life while waiting to belong, contribute, and be trusted. More than a refugee story, the book is a human reflection on dignity, identity, resilience, and the long silence created when protection is offered without full opportunity. With a calm and constructive tone, Mesfin Hagos Tewolde examines how uncertainty can affect confidence, work, purpose, and the sense of future, while also showing how inner strength, clarity, and spiritual growth can emerge from years of limitation. The book invites refugees, migrants, policymakers, social workers, researchers, and thoughtful readers to reflect on the human consequences of systems that protect people but do not fully allow them to rebuild their lives. It is a story of waiting, awakening, resilience, and the quiet search for dignity and renewed purpose.

Un voyage d’exil et d’espoir : construire une nouvelle vie en Suisse est un récit autobiographique captivant sur la survie, la résilience et la quête de liberté. Mesfin Hagos Tewolde y partage son parcours personnel, depuis les difficultés vécues en Érythrée jusqu’à sa recherche de refuge et la reconstruction progressive de sa vie en Suisse. À travers une narration sincère et profonde, l’auteur raconte les épreuves de la vie de réfugié, le poids émotionnel de l’exil, la poursuite de l’éducation supérieure et le courage nécessaire pour recommencer dans un pays étranger en tant qu’ingénieur qualifié. Ce témoignage met en lumière la force de l’esprit humain face au déplacement, à l’incertitude et aux blessures de l’exil. Il explore aussi l’identité, la dignité, la persévérance et l’espoir qui peut naître même dans les moments les plus sombres. Plus qu’un simple récit personnel, ce livre est une invitation à comprendre le parcours d’un homme déterminé à survivre, à apprendre, à avancer et à bâtir une nouvelle vie avec courage et dignité.

A Venturi fertilizer injector is used in drip irrigation and fertigation systems to inject liquid fertilizer or soluble nutrients into the irrigation water line. It helps deliver nutrients directly to the crop root zone through drip tape, drip pipes, or micro-irrigation systems.

Vingt hivers en silence : Une vie en parenthèses est un livre de réflexion personnelle, sociale et philosophique sur l’expérience d’une vie protégée, mais longtemps suspendue. À partir d’un vécu réel, l’ouvrage explore ce que signifie attendre pendant des années : attendre de travailler, attendre d’appartenir, attendre d’être reconnu et attendre de vivre pleinement. Le livre montre comment le statut juridique, l’incertitude administrative et les conditions temporaires prolongées peuvent toucher l’identité, la dignité, la confiance et l’avenir d’une personne. Mais au cœur de cette attente naissent aussi une clarté intérieure, une transformation silencieuse et une compréhension plus profonde des liens entre institutions, société et destinée humaine. C’est un ouvrage sur la résilience sans amertume, la critique sans hostilité et l’éveil intérieur sans fuite. Il s’adresse aux réfugiés, aux décideurs, aux professionnels et à tous les lecteurs intéressés par la dignité humaine, la gouvernance, l’appartenance et l’évolution de la conscience.

Книга «Маршрутизация паводков на нерасчетных водосборах с использованием методов Маскингума» посвящена оценке методов паводкового маршрутизирования для речных участков, где отсутствуют прямые гидрометрические наблюдения. В работе рассматривается применение методов Маскингума и Маскингума–Кунге для оценки расходов и гидрографов стока на нерасчетных речных участках, включая влияние бокового притока. Параметры модели калибруются на основе наблюдаемых данных, после чего метод применяется к неохваченным наблюдениями участкам. Исследование основано на анализе трех субводосборов в бассейне реки Тугела в Южной Африке с использованием цифровых моделей рельефа, эмпирических уравнений и гидрологического моделирования. Результаты показывают, что откалиброванный метод Маскингума–Кунге способен достаточно точно воспроизводить гидрографы стока и может быть полезным инструментом для инженерной оценки паводков в бассейнах с ограниченными данными. Книга представляет интерес для специалистов в области гидрологии, гидротехнического строительства, водных ресурсов, речной инженерии, паводкового анализа и проектирования гидротехнических сооружений.