standards / manuals / guidelines for small hydro development

ManometerMasonry damMaximum demandMaximum flood level (MFL)MeanderMegaMegawatt (MW)Megawatt-hour (MWh)MemorandumofUnderstanding (MOU)Minimum water level(Min.W.L.)MitigationMorning glory spillwayMotor efficiencyNatural floodwayNegative pressureNet capabilityNet head (H N )Net present value (NPV)Normal operating level (NOL)Off peakAn instrument for measuring pressure.Any dam constructed mainly of stone, brick or concreteblocks jointed with mortar.The greatest of all demands of the load that has occurredwithin a specified period of time.The maximum water level in the head pond resulting fromthe design flood assuming normal operation of floodcontrol equipment, typically spillway gates.Big bend and loops in a river channel as the river snakesthrough a flat land area.A prefix meaning "million".One million watts of electrical power (capacity).One million watt- hours of electrical energy.A formal document that states the intentions and/orresponsibilities of the signatory parties.The water level corresponding to “empty” reservoircondition. At levels below the Min. W.L. the plant designflow cannot be delivered and plant output would thereduced. Sometimes referred to as minimum operatinglevel.Special structures and / or operation practices to reduce oreliminate adverse environment effects of a hydropowerdevelopment.A circular or glory hole form of a drop inlet spillway.Usually free standing in the reservoir and so called becauseof its resemblance to the morning glory flower.The ratio of energy delivered by a motor to the energysupplied to it during a fixed period or cycle.The channel of a water course and those portions of theadjoining flood plain which are reasonably required tocarry a selected probability floodPressure within a pipe that is less than atmosphericpressure.The maximum load-carrying ability of the equipment,exclusive of station use, under specified conditions for agiven time interval, independent of the characteristics ofthe load.Net head is equal to gross head less all hydraulic lossesbetween reservoir/forebay to tailrace except thosechargeable to the turbine.The difference between revenues and expenses, bothdiscounted at a fixed periodic interest rate and time period,is the net present value (NPV) of the investment. Often thelifetime NPV is of interest.The water level in the forebay tank when plant is operatingunder design conditionsA period of relatively low demand for electrical power,such as the middle of the night.AHEC/MNRE/SHP Standards / General ­ Small Hydropower Definitions and Glossary of Terms 18