SCS Curve Number (CN) method, proposed by USDA Soil Conservation Service (SCS, now known as NRCS), has been widely used for infiltration loss and runoff calculation due to its simplicity…
SCS Curve Number (CN) method, proposed by USDA Soil Conservation Service (SCS, now known as NRCS), has been widely used for infiltration loss and runoff calculation due to its simplicity…
In addition to loss through infiltration, during a precipitation-runoff process other losses may need to be accounted for as well, which include canopy interception, surface depression storage, and evapotranspiration (ET).…
Initial and Constant Loss Method and Deficit and Constant Loss Method are two common infiltration methods in HEC-HMS and they share the same underlying concept, simply put, after the "initial…
This post is to explain how to set up an HMR 52 storm in HEC-HMS by using HEC-MetVue PMS parameters and how to optimize it by setting a objective goal…
Probable maximum precipitation (PMP) is theoretically the greatest precipitation for a given duration that is physically possible over a given size storm area at a particular geographic location. Probable maximum…
HEC-DSS, USACE Hydrologic Engineering Center Data Storage System, is a type of database system to store data primarily for hydrologic and hydraulic modeling (*.dss file). HEC-DSSVue is a tool to…
HEC-DSS, USACE Hydrologic Engineering Center Data Storage System, is a type of database system to store data primarily for hydrologic and hydraulic modeling (*.dss file). HEC-DSSVue is a tool to…
ModClark method is a distributed rainfall-runoff transform method available in HEC-HMS. To apply ModClark transform method, a basin (watershed) is subdivided into a gridded system and each grid cell is…
Clark Unit Hydrograph transform method was originally proposed by C. O. Clark in 1945. Clark Unit Hydrograph embodies two basic features of a watershed (drainage basin) rainfall-runoff process (Figure 1):…
Modified Puls Routing, also known as storage routing or level-pool routing, is a commonly used reach (channel) routing method in HEC-HMS. Modified Puls Routing is based on continuity equation. In…