PPT-Weirs

Generally any flow obstruction that causes water to rise to flow over it but used exclusively for intentional obstructions Uses include flow measurement sharpcrested weirs and control of water surface profile eg by inducing supercritical flow broadcrested weirs. They can have a profou nd impact on society and infrastructure not only locally but also in distant locations So they need to operate problemfree throughout long lifetimes Objectives The seminar will act as an opportunity for exchange of ideas and k Hydraulics of Semi Circular Weirs. Q=CLH. t. 3/2. L = Effective Length of Weir. H. t. = Total Head (Still Pool). = H + V. 2. /2g = Energy Grade Line. . H & V measured 3H upstream from weir. . for balancing hatchery functions with natural fish protections. Brad Cavallo. pHOS. pHOB. Excess Harvest. Issues. In. -river. Releases. Potential Actions. Reduced Hatchery. Production. In-river releases of hatchery fish. Hydraulics of Semi Circular Weirs. Q=CLH. t. 3/2. L = Effective Length of Weir. H. t. = Total Head (Still Pool). = H + V. 2. /2g = Energy Grade Line. . H & V measured 3H upstream from weir. Westport . RRAT. FY 14 Workload O&M – Westport . RM 257 - 253. Address a repetitive dredge location – We have dredged over 1.8M cy since 2007 at a cost of $4.4M.. Design includes the construction of 8 weirs, 2 dike extensions, 1 trail dike, and 1 SCED.. Habitat Heterogeneity. Cache River. Installed in an attempt to save Heron Pond by:. Raising stream bed elevation by depositing . sediment. Recent research indicates an overall loss of 2ft since 1996. 13 Year Drought. Regional water elevations were very low coming into the end of 2017. We were in the end of a 13 year drought cycle. This resulted in historically low dry season water levels as much as 4 feet below control elevation throughout many of these communities. During this low water time, vegetation expanded along the lake banks and canals. The lack of drainage demand made the maintenance of the system a lower priority. . Hydraulics of Semi Circular Weirs. Q=CLH. t. 3/2. L = Effective Length of Weir. H. t. = Total Head (Still Pool). = H V. 2. /2g = Energy Grade Line. . H & V measured 3H upstream from weir. Dr. J. . Badshah. University Professor – cum - Chief Scientist. Dairy Engineering Department. Sanjay Gandhi Institute of Dairy Science & Technology, . Jagdeopath. , Patna. (Bihar Animal Sciences University, Patna).